CN103022552B - A kind of for extended-life lithium ion battery under shallow charge and discharge condition and preparation method thereof - Google Patents
A kind of for extended-life lithium ion battery under shallow charge and discharge condition and preparation method thereof Download PDFInfo
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- CN103022552B CN103022552B CN201210557983.XA CN201210557983A CN103022552B CN 103022552 B CN103022552 B CN 103022552B CN 201210557983 A CN201210557983 A CN 201210557983A CN 103022552 B CN103022552 B CN 103022552B
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 36
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 36
- 238000002360 preparation method Methods 0.000 title abstract description 16
- 239000007774 positive electrode material Substances 0.000 claims abstract description 35
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims abstract description 17
- 229910052744 lithium Inorganic materials 0.000 claims abstract description 17
- 239000000463 material Substances 0.000 claims abstract description 16
- 239000000203 mixture Substances 0.000 claims abstract description 13
- 229910010707 LiFePO 4 Inorganic materials 0.000 claims abstract description 12
- 239000002253 acid Substances 0.000 claims abstract description 12
- 229910017052 cobalt Inorganic materials 0.000 claims abstract description 11
- 239000010941 cobalt Substances 0.000 claims abstract description 11
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims abstract description 11
- 229910002097 Lithium manganese(III,IV) oxide Inorganic materials 0.000 claims abstract description 8
- ZVKRVGZVXQYLPZ-UHFFFAOYSA-N [Li].[V].P(O)(O)(O)=O Chemical compound [Li].[V].P(O)(O)(O)=O ZVKRVGZVXQYLPZ-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000002131 composite material Substances 0.000 claims abstract description 8
- SBWRUMICILYTAT-UHFFFAOYSA-K lithium;cobalt(2+);phosphate Chemical compound [Li+].[Co+2].[O-]P([O-])([O-])=O SBWRUMICILYTAT-UHFFFAOYSA-K 0.000 claims abstract description 8
- ILXAVRFGLBYNEJ-UHFFFAOYSA-K lithium;manganese(2+);phosphate Chemical compound [Li+].[Mn+2].[O-]P([O-])([O-])=O ILXAVRFGLBYNEJ-UHFFFAOYSA-K 0.000 claims abstract description 8
- 239000006258 conductive agent Substances 0.000 claims description 26
- 239000002002 slurry Substances 0.000 claims description 25
- 239000000853 adhesive Substances 0.000 claims description 23
- 230000001070 adhesive effect Effects 0.000 claims description 23
- 239000011230 binding agent Substances 0.000 claims description 17
- 238000003756 stirring Methods 0.000 claims description 17
- 230000004888 barrier function Effects 0.000 claims description 15
- 239000006183 anode active material Substances 0.000 claims description 14
- 239000003792 electrolyte Substances 0.000 claims description 10
- 238000003475 lamination Methods 0.000 claims description 10
- 238000004804 winding Methods 0.000 claims description 10
- 238000004062 sedimentation Methods 0.000 claims description 9
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 claims description 8
- 238000001704 evaporation Methods 0.000 claims description 8
- 230000008020 evaporation Effects 0.000 claims description 8
- 239000007788 liquid Substances 0.000 claims description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 7
- 230000032683 aging Effects 0.000 claims description 7
- 230000008859 change Effects 0.000 claims description 7
- 238000005538 encapsulation Methods 0.000 claims description 7
- 238000011049 filling Methods 0.000 claims description 7
- 239000012528 membrane Substances 0.000 claims description 7
- 238000007789 sealing Methods 0.000 claims description 7
- 238000003466 welding Methods 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 4
- 239000002033 PVDF binder Substances 0.000 claims description 4
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 4
- ZUOUZKKEUPVFJK-UHFFFAOYSA-N diphenyl Chemical compound C1=CC=CC=C1C1=CC=CC=C1 ZUOUZKKEUPVFJK-UHFFFAOYSA-N 0.000 claims description 4
- 239000004033 plastic Substances 0.000 claims description 4
- 229920003023 plastic Polymers 0.000 claims description 4
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims description 4
- 229910002804 graphite Inorganic materials 0.000 claims description 3
- 239000010439 graphite Substances 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 229910000838 Al alloy Inorganic materials 0.000 claims description 2
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 2
- 229920002134 Carboxymethyl cellulose Polymers 0.000 claims description 2
- 229910013188 LiBOB Inorganic materials 0.000 claims description 2
- 229910013870 LiPF 6 Inorganic materials 0.000 claims description 2
- 229910001069 Ti alloy Inorganic materials 0.000 claims description 2
- 235000010290 biphenyl Nutrition 0.000 claims description 2
- 239000004305 biphenyl Substances 0.000 claims description 2
- 229910052799 carbon Inorganic materials 0.000 claims description 2
- 239000004917 carbon fiber Substances 0.000 claims description 2
- 239000002041 carbon nanotube Substances 0.000 claims description 2
- 229910021393 carbon nanotube Inorganic materials 0.000 claims description 2
- 229920006184 cellulose methylcellulose Polymers 0.000 claims description 2
- 239000003795 chemical substances by application Substances 0.000 claims description 2
- 229910052802 copper Inorganic materials 0.000 claims description 2
- 239000010949 copper Substances 0.000 claims description 2
- 239000011889 copper foil Substances 0.000 claims description 2
- 239000013538 functional additive Substances 0.000 claims description 2
- 229910003002 lithium salt Inorganic materials 0.000 claims description 2
- 159000000002 lithium salts Chemical class 0.000 claims description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 2
- 239000012046 mixed solvent Substances 0.000 claims description 2
- 229920000098 polyolefin Polymers 0.000 claims description 2
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 2
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 2
- 239000011257 shell material Substances 0.000 claims description 2
- 229920003048 styrene butadiene rubber Polymers 0.000 claims description 2
- 239000011366 tin-based material Substances 0.000 claims description 2
- 239000010936 titanium Substances 0.000 claims description 2
- 229910052719 titanium Inorganic materials 0.000 claims description 2
- 238000011217 control strategy Methods 0.000 abstract description 3
- 239000002904 solvent Substances 0.000 description 20
- -1 housing Substances 0.000 description 7
- 229910000314 transition metal oxide Inorganic materials 0.000 description 6
- 239000010405 anode material Substances 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- KFDQGLPGKXUTMZ-UHFFFAOYSA-N [Mn].[Co].[Ni] Chemical compound [Mn].[Co].[Ni] KFDQGLPGKXUTMZ-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 241000446313 Lamella Species 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- QXZUUHYBWMWJHK-UHFFFAOYSA-N [Co].[Ni] Chemical compound [Co].[Ni] QXZUUHYBWMWJHK-UHFFFAOYSA-N 0.000 description 1
- 239000011149 active material Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000006399 behavior Effects 0.000 description 1
- CKFRRHLHAJZIIN-UHFFFAOYSA-N cobalt lithium Chemical compound [Li].[Co] CKFRRHLHAJZIIN-UHFFFAOYSA-N 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000009781 safety test method Methods 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 241000894007 species Species 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Battery Electrode And Active Subsutance (AREA)
- Secondary Cells (AREA)
Abstract
The present invention relates to a kind of for extended-life lithium ion battery under shallow charge and discharge condition and preparation method thereof, belong to technical field of lithium ion.The positive active material of this battery is any two kinds or three kinds of compositions in cobalt acid lithium, LiMn2O4, LiFePO 4, phosphoric acid vanadium lithium, lithium manganese phosphate and cobalt phosphate lithium, operating voltage difference in two kinds described in control or three kinds of positive electrodes between every two kinds of positive electrodes is not less than 0.1V, in described two kinds or three kinds of positive electrodes, the percentage by weight that often kind of positive electrode accounts for positive active material is all not less than 30%.Extended-life lithium ion battery under shallow charge and discharge condition of the present invention, by the introducing of anode composite sheet, has adapted to existing control strategy from the removal lithium embedded spike potential of material, has extended the working life of system further.
Description
Technical field
The present invention relates to a kind of lithium ion battery and preparation method thereof, more particularly, the present invention relates to a kind of for extended-life lithium ion battery under shallow charge and discharge condition and preparation method thereof, belong to technical field of lithium ion.
Background technology
At present, on market common shallow fill shallow put condition under (as: on typical LEO satellite, the charging interval of chemical power source usual each orbital period is 60 minutes, discharge time is 30 minutes, long-term depth of discharge is 20%) positive active material of lithium ion battery that works is all adopt pure transition metal oxide, but there is certain problem in this kind of material.Although the lithium ion battery as being positive pole with pure cobalt acid lithium or nickel cobalt binary material has high-energy-density and the easy advantage such as preparation, there is poor stability and the short problem of working life.
Under this type of service condition, common way is in power-supply controller of electric, arrange many grades of end of charge voltage, in power-supply system work according to the attenuation automatic or manual of chemical power source step by step lifting end of charge voltage to reach the object extending power-supply system working life.But adopt the method can only extend working life to a certain extent; the working life of system is still mainly limited to activated species used, and the safety issue of pure transition metal oxide lithium ion battery under protective circuit failure conditions also becomes increasingly conspicuous.
Prior art it is also proposed some schemes:
It is 200810029727.7 that State Intellectual Property Office discloses an application number in 2010.1.27, name is called the patent of invention of " anode pole piece of secondary lithium battery and preparation method thereof ", it discloses a kind of anode pole piece of secondary lithium battery, be coated with at least two membranes lamella respectively collector is two-sided, the constituent material of every layer or proportioning difference, the fail safe of the chargeable lithium ion battery prepared with this positive pole is higher, but obviously, larger between two-layer diaphragm interface resistance can affect its electrical property and cycle performance.
Secondly, the scheme adopting blended anode material to prepare electrokinetic cell has: it is 200910214499.5 that State Intellectual Property Office discloses an application number in 2011.7.6, the patent of invention that name is called " using the electrokinetic cell of blended anode material ", the composite material that this patent have employed LiFePO 4 and nickel-cobalt-manganese ternary material is positive active material, although the battery prepared with this active material comparatively nickel-cobalt-manganese ternary material has better fail safe and cycle performance, but, after bi-material mixing inevitably there is transition metal oxide in pole piece in the positive pole of preparation, and electrolyte can more or less cause the dissolving of metal ion in surface transition metal oxide to affect cycle performance, and the existence of the transition metal oxide of Modificati on difference in abuse conditions also can cause certain potential safety hazard.
Summary of the invention
The present invention is intended to solve existing battery and is not suitable for working long hours under shallow charge and discharge condition, there is the problem of potential safety hazard, there is provided a kind of for the extended-life lithium ion battery under shallow charge and discharge condition, existing control strategy can be adapted to, alleviate the problems such as the fail safe adopting at present pure transition metal oxide to bring as anode material for lithium-ion batteries or blended anode material lithium ion battery is not good simultaneously.
In order to realize foregoing invention object, its concrete technical scheme is as follows:
A kind of for the extended-life lithium ion battery under shallow charge and discharge condition, comprise barrier film, housing, electrolyte, negative pole and positive pole, described positive pole is by positive active material, conductive agent and adhesive coated form on plus plate current-collecting body, it is characterized in that: described positive active material is cobalt acid lithium, LiMn2O4, LiFePO 4, phosphoric acid vanadium lithium, any two kinds or three kinds of compositions in lithium manganese phosphate and cobalt phosphate lithium, operating voltage difference in two kinds described in control or three kinds of positive electrodes between every two kinds of positive electrodes is not less than 0.1V, in described two kinds or three kinds of positive electrodes, the percentage by weight that often kind of positive electrode accounts for positive active material is all not less than 30%.
Preferably, the mass ratio of positive active material of the present invention, conductive agent and binding agent is 90-98:1-5:1-5.
Above-mentioned lithium ion battery, wherein, barrier film is between positive and negative electrode, and adopt lamination, barrier film bag or winding to form battery core, barrier film is microporous polyolefin film, non-woven membrane or composite membrane.
The shell material of above-mentioned lithium ion battery is stainless steel, aluminium alloy, plastics, aluminum-plastic composite membrane or titanium alloy.
The electrolyte of above-mentioned lithium ion battery by electric conducting lithium salt as LiPF
6, LiBOB or their mixture be dissolved in as EC, PC, EMC, DMC or in the middle of them in the mixed solvent of any two kinds or more, adds functional additive if desired as VC, FEC, biphenyl.
Described negative pole is online at Copper Foil, copper mesh, titanium foil or titanium by material with carbon element, silica-base material or the agent of tin-based material hybrid conductive, adhesive coated.
Further, conductive agent is the one or any multiple material mixing composition in conductive black, graphite, carbon fiber, carbon nano-tube.
Described binding agent is made up of the multiple of ratio one or any in PVDF, PTFE, CMC, SBR.
A kind of preparation method for the extended-life lithium ion battery under shallow charge and discharge condition, comprise and prepare positive pole, prepare negative pole, both positive and negative polarity roller is cut, the grouping of both positive and negative polarity sieve, both positive and negative polarity lamination or winding, tab welding, encapsulation, baking, vacuum liquid filling, aging, change into, secondary sealing, sorting and finished product, it is characterized in that: described positive pole of preparing comprises following processing step: first get binding agent and be dissolved in solvent, stirring and dissolving forms adhesive solution fully afterwards; Conductive agent and positive electrode is added in adhesive solution; First add the positive electrode that real density is minimum, adjustment viscosity, makes slurry not sedimentation, then adds other positive electrode successively from low to high according to real density, stir and obtain anode active material slurry; Anode active material slurry is coated on plus plate current-collecting body, evaporation of solvent, obtains positive plate.
Preferably, solvent of the present invention is 1-METHYLPYRROLIDONE.
Preferably, adjustment viscosity of the present invention refers to that adjustment viscosity is to 2500-6000mPas.
The useful technique effect that the present invention brings:
1, extended-life lithium ion battery under shallow charge and discharge condition of the present invention is by the introducing of anode composite sheet, existing control strategy has been adapted to from the removal lithium embedded spike potential of material, extend the working life of system further, the differential capacity curve of often kind of selective positive electrode all has respective distinctive removal lithium embedded peak, by selecting two kinds or three kinds of positive electrodes simultaneously, Mechanism of electrochemical behaviors of anhydrous has adapted to the strategy of existing end of charge voltage grading control, the working life longer than the single positive electrode of existing use can be provided, the object improving fail safe can also be reached simultaneously, be highly suitable for the use under shallow charge and discharge condition,
2, preparation method provided by the invention takes full advantage of the property difference mainly difference of real density and the characteristic of slurry non-newtonian fluid of often kind of positive electrode, operating process is simple, without the need to carrying out twice coating, and this preparation method can ensure that several positive electrode shares identical conductive agent network, reduce the interface impedance between different materials, preferred solvent and range of viscosities further ensure slurry not sedimentation.
Embodiment
embodiment 1
A kind of for the extended-life lithium ion battery under shallow charge and discharge condition, comprise barrier film, housing, electrolyte, negative pole and positive pole, described positive pole is by positive active material, conductive agent and adhesive coated form on plus plate current-collecting body, described positive active material is cobalt acid lithium, LiMn2O4, LiFePO 4, phosphoric acid vanadium lithium, any two kinds or three kinds of compositions in lithium manganese phosphate and cobalt phosphate lithium, operating voltage difference in two kinds described in control or three kinds of positive electrodes between every two kinds of positive electrodes is not less than 0.1V, in described two kinds or three kinds of positive electrodes, the percentage by weight that often kind of positive electrode accounts for positive active material is all not less than 30%.
embodiment 2
A kind of for the extended-life lithium ion battery under shallow charge and discharge condition, comprise barrier film, housing, electrolyte, negative pole and positive pole, described positive pole is by positive active material, conductive agent and adhesive coated form on plus plate current-collecting body, described positive active material is cobalt acid lithium, LiMn2O4, LiFePO 4, phosphoric acid vanadium lithium, any two kinds or three kinds of compositions in lithium manganese phosphate and cobalt phosphate lithium, operating voltage difference in two kinds described in control or three kinds of positive electrodes between every two kinds of positive electrodes is not less than 0.1V, in described two kinds or three kinds of positive electrodes, the percentage by weight that often kind of positive electrode accounts for positive active material is all not less than 30%.
Preferably, the mass ratio of described positive active material, conductive agent and binding agent is 90:1:1.
embodiment 3
A kind of for the extended-life lithium ion battery under shallow charge and discharge condition, comprise barrier film, housing, electrolyte, negative pole and positive pole, described positive pole is by positive active material, conductive agent and adhesive coated form on plus plate current-collecting body, described positive active material is cobalt acid lithium, LiMn2O4, LiFePO 4, phosphoric acid vanadium lithium, any two kinds or three kinds of compositions in lithium manganese phosphate and cobalt phosphate lithium, operating voltage difference in two kinds described in control or three kinds of positive electrodes between every two kinds of positive electrodes is not less than 0.1V, in described two kinds or three kinds of positive electrodes, the percentage by weight that often kind of positive electrode accounts for positive active material is all not less than 30%.
Preferably, the mass ratio of described positive active material, conductive agent and binding agent is 98:5:5.
embodiment 4
A kind of for the extended-life lithium ion battery under shallow charge and discharge condition, comprise barrier film, housing, electrolyte, negative pole and positive pole, described positive pole is by positive active material, conductive agent and adhesive coated form on plus plate current-collecting body, described positive active material is cobalt acid lithium, LiMn2O4, LiFePO 4, phosphoric acid vanadium lithium, any two kinds or three kinds of compositions in lithium manganese phosphate and cobalt phosphate lithium, operating voltage difference in two kinds described in control or three kinds of positive electrodes between every two kinds of positive electrodes is not less than 0.1V, in described two kinds or three kinds of positive electrodes, the percentage by weight that often kind of positive electrode accounts for positive active material is all not less than 30%.
Preferably, the mass ratio of described positive active material, conductive agent and binding agent is 94:3:3.
embodiment 5
A kind of for the extended-life lithium ion battery under shallow charge and discharge condition, comprise barrier film, housing, electrolyte, negative pole and positive pole, described positive pole is by positive active material, conductive agent and adhesive coated form on plus plate current-collecting body, described positive active material is cobalt acid lithium, LiMn2O4, LiFePO 4, phosphoric acid vanadium lithium, any two kinds or three kinds of compositions in lithium manganese phosphate and cobalt phosphate lithium, operating voltage difference in two kinds described in control or three kinds of positive electrodes between every two kinds of positive electrodes is not less than 0.1V, in described two kinds or three kinds of positive electrodes, the percentage by weight that often kind of positive electrode accounts for positive active material is all not less than 30%.
Preferably, the mass ratio of described positive active material, conductive agent and binding agent is 91:4:2.
embodiment 6
A kind of preparation method for the extended-life lithium ion battery under shallow charge and discharge condition, comprise and prepare positive pole, prepare negative pole, both positive and negative polarity roller is cut, the grouping of both positive and negative polarity sieve, both positive and negative polarity lamination or winding, tab welding, encapsulation, baking, vacuum liquid filling, aging, change into, secondary sealing, sorting and finished product, described positive pole of preparing comprises following processing step: first get binding agent and be dissolved in solvent, stirring and dissolving forms adhesive solution fully afterwards; Conductive agent and positive electrode is added in adhesive solution; First add the positive electrode that real density is minimum, adjustment viscosity, makes slurry not sedimentation, then adds other positive electrode successively from low to high according to real density, stir and obtain anode active material slurry; Anode active material slurry is coated on plus plate current-collecting body, evaporation of solvent, obtains positive plate.
embodiment 7
A kind of preparation method for the extended-life lithium ion battery under shallow charge and discharge condition, comprise and prepare positive pole, prepare negative pole, both positive and negative polarity roller is cut, the grouping of both positive and negative polarity sieve, both positive and negative polarity lamination or winding, tab welding, encapsulation, baking, vacuum liquid filling, aging, change into, secondary sealing, sorting and finished product, described positive pole of preparing comprises following processing step: first get binding agent and be dissolved in solvent, stirring and dissolving forms adhesive solution fully afterwards; Conductive agent and positive electrode is added in adhesive solution; First add the positive electrode that real density is minimum, adjustment viscosity, makes slurry not sedimentation, then adds other positive electrode successively from low to high according to real density, stir and obtain anode active material slurry; Anode active material slurry is coated on plus plate current-collecting body, evaporation of solvent, obtains positive plate.
Preferred:
Described solvent is 1-METHYLPYRROLIDONE.
Described adjustment viscosity refers to that adjustment viscosity is to 2500mPas.
embodiment 8
A kind of preparation method for the extended-life lithium ion battery under shallow charge and discharge condition, comprise and prepare positive pole, prepare negative pole, both positive and negative polarity roller is cut, the grouping of both positive and negative polarity sieve, both positive and negative polarity lamination or winding, tab welding, encapsulation, baking, vacuum liquid filling, aging, change into, secondary sealing, sorting and finished product, described positive pole of preparing comprises following processing step: first get binding agent and be dissolved in solvent, stirring and dissolving forms adhesive solution fully afterwards; Conductive agent and positive electrode is added in adhesive solution; First add the positive electrode that real density is minimum, adjustment viscosity, makes slurry not sedimentation, then adds other positive electrode successively from low to high according to real density, stir and obtain anode active material slurry; Anode active material slurry is coated on plus plate current-collecting body, evaporation of solvent, obtains positive plate.
Preferred:
Described solvent is 1-METHYLPYRROLIDONE.
Described adjustment viscosity refers to that adjustment viscosity is to 6000mPas.
embodiment 9
A kind of preparation method for the extended-life lithium ion battery under shallow charge and discharge condition, comprise and prepare positive pole, prepare negative pole, both positive and negative polarity roller is cut, the grouping of both positive and negative polarity sieve, both positive and negative polarity lamination or winding, tab welding, encapsulation, baking, vacuum liquid filling, aging, change into, secondary sealing, sorting and finished product, described positive pole of preparing comprises following processing step: first get binding agent and be dissolved in solvent, stirring and dissolving forms adhesive solution fully afterwards; Conductive agent and positive electrode is added in adhesive solution; First add the positive electrode that real density is minimum, adjustment viscosity, makes slurry not sedimentation, then adds other positive electrode successively from low to high according to real density, stir and obtain anode active material slurry; Anode active material slurry is coated on plus plate current-collecting body, evaporation of solvent, obtains positive plate.
Preferred:
Described solvent is 1-METHYLPYRROLIDONE.
Described adjustment viscosity refers to that adjustment viscosity is to 4250mPas.
embodiment 10
A kind of preparation method for the extended-life lithium ion battery under shallow charge and discharge condition, comprise and prepare positive pole, prepare negative pole, both positive and negative polarity roller is cut, the grouping of both positive and negative polarity sieve, both positive and negative polarity lamination or winding, tab welding, encapsulation, baking, vacuum liquid filling, aging, change into, secondary sealing, sorting and finished product, described positive pole of preparing comprises following processing step: first get binding agent and be dissolved in solvent, stirring and dissolving forms adhesive solution fully afterwards; Conductive agent and positive electrode is added in adhesive solution; First add the positive electrode that real density is minimum, adjustment viscosity, makes slurry not sedimentation, then adds other positive electrode successively from low to high according to real density, stir and obtain anode active material slurry; Anode active material slurry is coated on plus plate current-collecting body, evaporation of solvent, obtains positive plate.
Preferred:
Described solvent is 1-METHYLPYRROLIDONE.
Described adjustment viscosity refers to that adjustment viscosity is to 5500mPas.
embodiment 11
Below by embodiment, the present invention is further illustrated:
The Making programme of battery of the present invention is as follows: both positive and negative polarity is prepared burden, and---------both positive and negative polarity roller is cut, and---both positive and negative polarity sieve is divided into groups, and------tab welding---encapsulates and---toasts that---vacuum liquid filling---agingly---changes into---secondary sealing---sorting---finished product both positive and negative polarity lamination (winding) in both positive and negative polarity coating in both positive and negative polarity slurrying
Anode formula:
Adopt positive active material content be 96wt%(wherein, the LiFePO 4 of operating voltage 3.4V and the cobalt acid lithium of operating voltage 3.7V mix according to the ratio of weight ratio 6:4), conductive agent content is 1.7wt%, and binding agent PVDF content is 2.3wt%;
Cathode formula:
Graphite 95.6wt%, conductive agent 1.0wt%, CMC1.2wt%, SBR2.0wt%.
Positive pole slurrying:
First taking in proportion binding agent PVDF is dissolved in solvent NMP, stirring and dissolving forms solution fully afterwards, the positive electrode material LiFePO 4 of lithium of conductive agent and lower real density is added to above-mentioned solution, stir, adjusting viscosity to slurry not sedimentation, then adds the positive pole material of lithium cobalt acid of higher real density, stir, it is in the current collector aluminum foil of 12 microns that the slurry stirred is coated on thickness, evaporation of solvent, and roll-in obtains anode composite pole piece.
Barrier film uses 20 microns of monolayer polyethylene barrier films, and battery adopts laminated structure, and battery case is stainless steel.
Comparative example 1: positive active material is pure cobalt acid lithium, prepares battery according to same flow process;
Comparative example 2: positive active material is LiFePO 4, prepares battery according to same flow process.
Battery prepared by above-described embodiment and comparative example carries out capacity check and safety testing, and its result of the test is as shown in the table.
The battery adopting the present invention to prepare viewed from upper table has good cycle performance and good fail safe.
Claims (1)
1. one kind for the extended-life lithium ion battery under shallow charge and discharge condition, comprise barrier film, housing, electrolyte, negative pole and positive pole, described positive pole is by positive active material, conductive agent and adhesive coated form on plus plate current-collecting body, it is characterized in that: described positive active material is cobalt acid lithium, LiMn2O4, LiFePO 4, phosphoric acid vanadium lithium, any two kinds or three kinds of compositions in lithium manganese phosphate and cobalt phosphate lithium, operating voltage difference in two kinds described in control or three kinds of positive electrodes between every two kinds of positive electrodes is not less than 0.1V, in described two kinds or three kinds of positive electrodes, the percentage by weight that often kind of positive electrode accounts for positive active material is all not less than 30%, the mass ratio of described positive active material, conductive agent and binding agent is 91:4:2,
Described lithium ion battery, wherein, barrier film is between positive and negative electrode, and adopt lamination, barrier film bag or winding to form battery core, barrier film is microporous polyolefin film, non-woven membrane or composite membrane; The shell material of described lithium ion battery is stainless steel, aluminium alloy, plastics, aluminum-plastic composite membrane or titanium alloy; The electrolyte of described lithium ion battery is by electric conducting lithium salt LiPF
6, LiBOB or their mixture is dissolved in EC, PC, EMC, DMC or in the middle of them in the mixed solvent of any two kinds or more, and add functional additive VC, FEC, biphenyl; Described negative pole is online at Copper Foil, copper mesh, titanium foil or titanium by material with carbon element, silica-base material or the agent of tin-based material hybrid conductive, adhesive coated, described conductive agent is the one or any multiple material mixing composition in conductive black, graphite, carbon fiber, carbon nano-tube, and described binding agent is made up of the multiple of ratio one or any in PVDF, PTFE, CMC, SBR;
Described is made up of following methods for the extended-life lithium ion battery under shallow charge and discharge condition:
Prepare positive pole, prepare negative pole, both positive and negative polarity roller is cut, the grouping of both positive and negative polarity sieve, both positive and negative polarity lamination or winding, tab welding, encapsulation, baking, vacuum liquid filling, aging, change into, secondary sealing, sorting and finished product, described positive pole of preparing comprises following processing step: first get binding agent and be dissolved in 1-METHYLPYRROLIDONE, stirring and dissolving forms adhesive solution fully afterwards; Conductive agent and positive electrode is added in adhesive solution; First add the positive electrode that real density is minimum, adjustment viscosity, to 4250mPas, makes slurry not sedimentation, then adds other positive electrode successively from low to high according to real density, stir and obtain anode active material slurry; Anode active material slurry be coated on plus plate current-collecting body, evaporation removing 1-METHYLPYRROLIDONE, obtains positive plate.
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| CN104749525B (en) * | 2013-12-31 | 2017-11-17 | 华为技术有限公司 | Battery aging status detection means, system, method |
| EP3391440B1 (en) * | 2015-12-18 | 2019-10-30 | Saft | Use of electrochemical cells containing a lithiated titanate oxide negative active material for low earth orbit applications |
| CN106410188A (en) * | 2016-12-06 | 2017-02-15 | 先进储能材料国家工程研究中心有限责任公司 | Lithium ion battery positive electrode slurry and preparation method thereof |
| CN112731174B (en) * | 2020-12-25 | 2023-04-07 | 惠州市豪鹏科技有限公司 | Method for evaluating full-charge and shallow-discharge performance of lithium battery positive electrode material |
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| CN1641912A (en) * | 2004-01-02 | 2005-07-20 | 深圳华粤宝电池有限公司 | Lithium ion cell anode, lithium cell using same and its manufacturing method |
| CN101202361A (en) * | 2007-04-24 | 2008-06-18 | 万向集团公司 | Lithium ion battery |
| CN101714629A (en) * | 2009-11-10 | 2010-05-26 | 苏州大学 | Tri-platform blended cathode material for lithium ion batteries and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1641912A (en) * | 2004-01-02 | 2005-07-20 | 深圳华粤宝电池有限公司 | Lithium ion cell anode, lithium cell using same and its manufacturing method |
| CN101202361A (en) * | 2007-04-24 | 2008-06-18 | 万向集团公司 | Lithium ion battery |
| CN101714629A (en) * | 2009-11-10 | 2010-05-26 | 苏州大学 | Tri-platform blended cathode material for lithium ion batteries and preparation method thereof |
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Effective date of registration: 20180427 Address after: 610000 18 West core road, hi-tech West District, Chengdu, Sichuan Patentee after: Dongfang Electric Co., Ltd. Address before: 610036 Shu Han Road, Jinniu District, Chengdu, Sichuan Province, No. 333 Patentee before: Dongfang Electric Corporation |