CN114122314A - Secondary battery - Google Patents
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- CN114122314A CN114122314A CN202111305819.5A CN202111305819A CN114122314A CN 114122314 A CN114122314 A CN 114122314A CN 202111305819 A CN202111305819 A CN 202111305819A CN 114122314 A CN114122314 A CN 114122314A
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- active material
- negative
- secondary battery
- current collector
- positive
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- 239000007774 positive electrode material Substances 0.000 claims abstract description 18
- 239000003575 carbonaceous material Substances 0.000 claims abstract description 16
- 239000003792 electrolyte Substances 0.000 claims abstract description 16
- 239000007773 negative electrode material Substances 0.000 claims abstract description 14
- YTPLMLYBLZKORZ-UHFFFAOYSA-N Thiophene Chemical compound C=1C=CSC=1 YTPLMLYBLZKORZ-UHFFFAOYSA-N 0.000 claims description 28
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 27
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 26
- 239000004917 carbon fiber Substances 0.000 claims description 26
- 239000011259 mixed solution Substances 0.000 claims description 22
- 239000002904 solvent Substances 0.000 claims description 19
- 238000005336 cracking Methods 0.000 claims description 18
- 238000002156 mixing Methods 0.000 claims description 16
- KTWOOEGAPBSYNW-UHFFFAOYSA-N ferrocene Chemical compound [Fe+2].C=1C=C[CH-]C=1.C=1C=C[CH-]C=1 KTWOOEGAPBSYNW-UHFFFAOYSA-N 0.000 claims description 14
- 229930192474 thiophene Natural products 0.000 claims description 14
- 239000011149 active material Substances 0.000 claims description 13
- 239000011258 core-shell material Substances 0.000 claims description 6
- -1 polytetrafluoroethylene Polymers 0.000 claims description 4
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 3
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 3
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 2
- 239000000956 alloy Substances 0.000 claims description 2
- 229910045601 alloy Inorganic materials 0.000 claims description 2
- 239000002238 carbon nanotube film Substances 0.000 claims description 2
- 239000002388 carbon-based active material Substances 0.000 claims description 2
- 239000002905 metal composite material Substances 0.000 claims description 2
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 claims description 2
- 239000002409 silicon-based active material Substances 0.000 claims description 2
- 239000010408 film Substances 0.000 claims 5
- 239000010409 thin film Substances 0.000 claims 3
- 230000007423 decrease Effects 0.000 claims 1
- 238000013508 migration Methods 0.000 abstract description 10
- 230000005012 migration Effects 0.000 abstract description 10
- 230000007704 transition Effects 0.000 abstract description 6
- 239000013543 active substance Substances 0.000 abstract description 4
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 36
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 24
- 229910001416 lithium ion Inorganic materials 0.000 description 11
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 10
- 230000006872 improvement Effects 0.000 description 10
- 150000002500 ions Chemical class 0.000 description 10
- 239000011248 coating agent Substances 0.000 description 8
- 238000000576 coating method Methods 0.000 description 8
- 238000000034 method Methods 0.000 description 8
- 239000007788 liquid Substances 0.000 description 7
- 230000008569 process Effects 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 238000010521 absorption reaction Methods 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 230000008595 infiltration Effects 0.000 description 4
- 238000001764 infiltration Methods 0.000 description 4
- 230000014759 maintenance of location Effects 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 238000003466 welding Methods 0.000 description 4
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 3
- 239000006256 anode slurry Substances 0.000 description 3
- 239000011267 electrode slurry Substances 0.000 description 3
- 229910052744 lithium Inorganic materials 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 239000002033 PVDF binder Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000002041 carbon nanotube Substances 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000000178 monomer Substances 0.000 description 2
- 229920002981 polyvinylidene fluoride Polymers 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 238000001291 vacuum drying Methods 0.000 description 2
- 238000009736 wetting Methods 0.000 description 2
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- SOXUFMZTHZXOGC-UHFFFAOYSA-N [Li].[Mn].[Co].[Ni] Chemical compound [Li].[Mn].[Co].[Ni] SOXUFMZTHZXOGC-UHFFFAOYSA-N 0.000 description 1
- ZYXUQEDFWHDILZ-UHFFFAOYSA-N [Ni].[Mn].[Li] Chemical compound [Ni].[Mn].[Li] ZYXUQEDFWHDILZ-UHFFFAOYSA-N 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
- 239000006183 anode active material Substances 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 229910021393 carbon nanotube Inorganic materials 0.000 description 1
- 239000006258 conductive agent Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000008367 deionised water Substances 0.000 description 1
- 229910021641 deionized water Inorganic materials 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- QHGJSLXSVXVKHZ-UHFFFAOYSA-N dilithium;dioxido(dioxo)manganese Chemical compound [Li+].[Li+].[O-][Mn]([O-])(=O)=O QHGJSLXSVXVKHZ-UHFFFAOYSA-N 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- IDGUHHHQCWSQLU-UHFFFAOYSA-N ethanol;hydrate Chemical compound O.CCO IDGUHHHQCWSQLU-UHFFFAOYSA-N 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000009830 intercalation Methods 0.000 description 1
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000003446 memory effect Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000002985 plastic film Substances 0.000 description 1
- 229920006255 plastic film Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/64—Carriers or collectors
- H01M4/66—Selection of materials
- H01M4/663—Selection of materials containing carbon or carbonaceous materials as conductive part, e.g. graphite, carbon fibres
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/64—Carriers or collectors
- H01M4/70—Carriers or collectors characterised by shape or form
- H01M4/80—Porous plates, e.g. sintered carriers
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Secondary Cells (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The invention belongs to the technical field of secondary batteries, and particularly relates to a secondary battery which comprises a positive plate, a negative plate, a diaphragm, electrolyte and a shell, wherein the diaphragm is used for separating the positive plate from the negative plate, the shell is used for installing the positive plate, the negative plate, the diaphragm and the electrolyte, the positive plate comprises a positive current collector and a positive active material layer arranged on at least one surface of the positive current collector, the negative plate comprises a negative current collector and a negative active material layer arranged on at least one surface of the negative current collector, the positive current collector and the negative current collector are carbon material films, and the carbon material films have porous structures. The secondary battery can store electrolyte, improve the wettability between an active substance and a current collector, and improve the ion transition capacity and speed; the carbon material has good conductivity, reduces ion migration resistance and improves battery rate.
Description
Technical Field
The invention belongs to the technical field of secondary batteries, and particularly relates to a secondary battery.
Background
Lithium ion batteries have been widely commercialized due to their characteristics of high energy density, long life, no memory effect, safety, environmental protection, etc. And along with the popularization and the development of wearable electronic intelligent equipment such as intelligent bracelet, smart mobile phone, OLED, AR/VR, lead to the power consumption increase of equipment, the duration shortens greatly, seriously influences people's experience and feels, promotes the duration of battery and has become the problem that needs the solution urgently. Therefore, the requirement on the energy density of the battery is higher and higher, and simultaneously, the requirement on the quick charging capacity of the battery is also higher, and the lithium ion battery on the current market hardly meets the charging requirement of large multiplying power.
Disclosure of Invention
The invention aims to: aiming at the defects of the prior art, the secondary battery is provided, which can store electrolyte, improve the wettability between an active substance and a current collector and improve the ion transition capacity and the ion transition rate; the carbon material has good conductivity, reduces ion migration resistance and improves battery rate.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a secondary battery, includes positive plate, negative pole piece, diaphragm, electrolyte and casing, the diaphragm is used for separating positive plate with the negative pole piece, the casing is used for installing positive plate, negative pole piece, diaphragm and electrolyte, positive plate include the anodal mass flow body and set up in the anodal active material layer on the at least surface of anodal mass flow body, the negative pole piece include the negative pole mass flow body with set up in the negative pole active material layer on the at least surface of negative pole mass flow body, the anodal mass flow body with the negative pole mass flow body is the carbon material film, the carbon material film has porous structure.
The porous carbon material film is adopted, so that the electrolyte can be stored, the infiltration performance among the positive/negative active substances, the current collector and the diaphragm is better, the problem of interface infiltration is solved, and the transition capacity and the rate of lithium ions are improved; the carbon material film disclosed by the invention is excellent in conductivity, the conductivity of the material can be further improved, the resistance in the ion migration process is reduced, and the charging performance is improved; the preparation of the ultrathin cathode coating can shorten the resistance in the Li ion migration process and reduce the ion migration distance, thereby improving the charge rate of the lithium ion battery.
As an improvement of a secondary battery of the present invention, the carbon material film is one of a carbon fiber film, a polytetrafluoroethylene film or a carbon nanotube film metal composite film.
As an improvement of the secondary battery of the present invention, the preparation method of the carbon fiber film comprises: mixing and dissolving ferrocene and thiophene in a solvent according to a weight ratio of 2-10: 1-3 to obtain a mixed solution, placing the mixed solution in a cracking furnace, setting the cracking temperature to be 800-2000 ℃, and the cracking time to be 5-30 min to obtain the carbon fiber film.
As an improvement of a secondary battery of the present invention, the positive electrode active material layer includes a positive electrode active material having a core-shell structure. The active material with the core-shell structure can store electrolyte, so that the infiltration performance among the positive active material, the current collector, the negative active material and the diaphragm is better, the problem of interface infiltration is solved, the transition capacity and the rate of lithium ions are improved, the conductivity of the carbon material is excellent, the conductivity of the material can be further improved, the resistance in the ion migration process is reduced, and the rate performance of the battery is improved. Preferably, the surfaces of the positive electrode current collector and the negative electrode current collector are both provided with active materials having a core-shell structure.
As an improvement of a secondary battery of the present invention, the concentration of the positive electrode active material in the positive electrode active material layer is decreased from the inside to the outside. The concentration gradient can be set by coating with a multi-die by adopting a multi-coating technology or using materials with different densities.
As an improvement of a secondary battery of the present invention, the concentration gradient of the positive electrode active material is 1% to 20%. The concentration of the inside of the positive electrode active material layer is high, and the concentration of the outside is low. The positive active material comprises one or more of lithium cobaltate, lithium manganate, lithium nickel cobalt manganese, lithium nickel manganese, lithium-rich manganese and lithium iron phosphate. The positive active material is provided with a certain concentration gradient, which is beneficial to the movement of ions and improves the performance.
As an improvement of a secondary battery of the present invention, the negative electrode active material layer includes one or more negative electrode active materials of a carbon-based active material, a silicon-based active material, a tin-based active material, a nitrogen-containing active material, or an alloy-based active material.
As an improvement of a secondary battery of the present invention, the negative electrode active material is a nano negative electrode active material. The particle size reaches 100 nm-20 mu m grade through dispersion of a high-speed disperser, the rotating speed of a dispersing device is 10000 r/min-30000 r/min, and the high-speed dispersion of the negative electrode material is to reduce the particle size, so that an ultrathin coating is convenient to prepare, the lithium ion migration distance is shortened during charging, the lithium ion de-intercalation rate is improved, and the problem of high-rate charging of a battery is solved.
As an improvement of a secondary battery of the present invention, the thickness of the positive electrode active material layer and/or the negative electrode active material layer is 4 μm to 18 μm.
As an improvement of the secondary battery of the present invention, the thickness of the positive electrode sheet and/or the negative electrode sheet is 10 μm to 50 μm. The cathode coating is thin, so that the resistance in the lithium ion migration process can be shortened, the ion migration distance is reduced, and the charging rate is improved.
Compared with the prior art, the invention has the beneficial effects that: the secondary battery can store electrolyte, improve the wettability between an active substance and a current collector, and improve the ion transition capacity and speed; the carbon material has good conductivity, reduces ion migration resistance and improves battery rate.
Detailed Description
The present invention will be described in further detail below with reference to specific embodiments and comparative examples, but the embodiments of the present invention are not limited thereto.
Example 1
A method for manufacturing a secondary battery, comprising the steps of:
step one, mixing lithium cobaltate with a core-shell structure, polyvinylidene fluoride and conductive graphite according to the weight ratio of 93:2.5:3.5, adding the mixture into 200ml of solvent N-methyl pyrrolidone to prepare anode slurry with the solid content of 45%, uniformly stirring the anode slurry, uniformly coating the anode slurry on the surface of an anode current collector by adopting multi-mode multi-coating to form an anode active material layer with a core-shell structure with a concentration gradient, wherein the surface density is 150g/m2～200g/m2And the thickness of the positive active material layer is 10 microns, and then the coated positive pole piece is dried and rolled, wherein the drying temperature is 100 ℃, the time is 2 hours, and the rolling pressure is 5T, so that the positive pole piece with the thickness of 40 microns is obtained.
Step two, mixing conductive carbon black, a binder polyvinylidene fluoride and a conductive agent carbon nano tube CNTs according to the weight part ratio of 85:6:4, adding a high-speed disperser for dispersing, adjusting the rotating speed of a dispersing device to 10000r/min to enable the particle size to reach 300nm, adding the dispersed particles into 300ml of solvent deionized water, uniformly stirring to prepare a negative electrode slurry with the solid content of 40%, coating the negative electrode slurry on the surface of a negative electrode current collector of a carbon fiber film in a multi-mode manner to obtain a negative electrode slurry with the thickness of 10 mu m and the surface density of 15g/m2The coated negative pole piece is dried and rolled at the drying temperature of 100 ℃ for 2.5h and the rolling pressure of 0.3T to obtain the negative pole piece with the thickness of 30 mu m.
Step three, winding and assembling die-cut negative pole pieces, polypropylene diaphragms and positive pole pieces in sequence to form a cell monomer, leading out the cell monomer by welding a tab, separating the positive pole pieces from the negative pole pieces by the diaphragms, welding a metal tab with tab glue to the tab in a rivet welding mode, and finally welding an aluminum plastic film and a naked cell together by top and side sealing to obtain the cell;
and step four, placing the battery core in a vacuum drying box, carrying out vacuum drying for 30h, testing the moisture of the battery core, injecting electrolyte into a glove box filled with inert gas of argon or nitrogen when the moisture is less than 120ppm, carrying out air exhaust and sealing, and carrying out secondary injection to compensate for the loss of the electrolyte to obtain the battery.
The utility model provides a secondary battery, includes positive plate, negative pole piece, diaphragm, electrolyte and casing, the diaphragm is used for separating positive plate with the negative pole piece, the casing is used for installing positive plate, negative pole piece, diaphragm and electrolyte, positive plate include the anodal mass flow body and set up in the anodal active material layer on the at least surface of anodal mass flow body, the negative pole piece include the negative pole mass flow body with set up in the negative pole active material layer on the at least surface of negative pole mass flow body, the anodal mass flow body with the negative pole mass flow body is the carbon material film, the carbon material film has porous structure.
The positive current collector and the negative current collector are carbon fiber film current collectors, and the carbon fiber film is prepared by the following steps: mixing and dissolving ferrocene and thiophene in a solvent according to a weight ratio of 2:1 by using the solvent to prepare a mixed solution, wherein the solvent is formed by mixing methanol and n-hexane, and the volume ratio of the methanol to the n-hexane is 20: 1; the concentration of ferrocene in the mixed solution is 12mg/mL, and the concentration of thiophene is 5 mu L/mL; and cracking the mixed solution in a cracking furnace at 1800 ℃ for 25min to obtain a carbon fiber film current collector, and collecting the carbon fiber film on the surface of the substrate wetted by a wetting liquid in a stretching mode, wherein the wetting liquid is an ethanol water solution with the volume of 30%.
Example 2
The difference from example 1 is that: the positive current collector and the negative current collector are carbon fiber film current collectors, and the carbon fiber film is prepared by the following steps: mixing ferrocene and thiophene in a weight ratio of 3:1 by using a solvent, and dissolving the mixture in the solvent to prepare a mixed solution, wherein the solvent is formed by mixing methanol and n-hexane, and the volume ratio of the methanol to the n-hexane is 15: 1; the concentration of ferrocene in the mixed solution is 10mg/mL, and the concentration of thiophene is 6 mu L/mL; and cracking the mixed solution in a cracking furnace at 1500 ℃ for 20min to obtain the carbon fiber film current collector.
The rest is the same as embodiment 1, and the description is omitted here.
Example 3
The difference from example 1 is that: the positive current collector and the negative current collector are carbon fiber film current collectors, and the carbon fiber film is prepared by the following steps: mixing and dissolving ferrocene and thiophene in a solvent according to a weight ratio of 5:1 to prepare a mixed solution, wherein the solvent is prepared by mixing methanol and n-hexane, and the volume ratio of the methanol to the n-hexane is 13: 2; the concentration of ferrocene in the mixed solution is 30mg/mL, and the concentration of thiophene is 8 mu L/mL; and cracking the mixed solution in a cracking furnace at 1200 ℃ for 30min to obtain the carbon fiber film current collector.
The rest is the same as embodiment 1, and the description is omitted here.
Example 4
The difference from example 1 is that: the positive current collector and the negative current collector are carbon fiber film current collectors, and the carbon fiber film is prepared by the following steps: mixing and dissolving ferrocene and thiophene in a solvent according to a weight ratio of 6:1 by using a solvent to prepare a mixed solution, wherein the solvent is formed by mixing methanol and n-hexane, and the volume ratio of the methanol to the n-hexane is 13: 1; the concentration of ferrocene in the mixed solution is 20mg/mL, and the concentration of thiophene is 5 mu L/mL; and cracking the mixed solution in a cracking furnace at 1600 ℃ for 26min to obtain the carbon fiber film current collector.
The rest is the same as embodiment 1, and the description is omitted here.
Example 5
The difference from example 1 is that: the positive current collector and the negative current collector are carbon fiber film current collectors, and the carbon fiber film is prepared by the following steps: mixing and dissolving ferrocene and thiophene in a solvent according to a weight ratio of 5:1 to prepare a mixed solution, wherein the solvent is prepared by mixing methanol and n-hexane, and the volume ratio of the methanol to the n-hexane is 13: 2; the concentration of ferrocene in the mixed solution is 30mg/mL, and the concentration of thiophene is 4 mu L/mL; and cracking the mixed solution in a cracking furnace at 2000 ℃ for 10min to obtain the carbon fiber film current collector.
The rest is the same as embodiment 1, and the description is omitted here.
Example 6
The difference from example 1 is that: the positive current collector and the negative current collector are carbon fiber film current collectors, and the carbon fiber film is prepared by the following steps: mixing and dissolving ferrocene and thiophene in a solvent according to a weight ratio of 5:1 to prepare a mixed solution, wherein the solvent is prepared by mixing methanol and n-hexane, and the volume ratio of the methanol to the n-hexane is 13: 2; the concentration of ferrocene in the mixed solution is 30mg/mL, and the concentration of thiophene is 4 mu L/mL; and cracking the mixed solution in a cracking furnace at 1200 ℃ for 30min to obtain the carbon fiber film current collector.
The rest is the same as embodiment 1, and the description is omitted here.
Comparative example 1
The difference from example 1 is that: the positive current collector and the negative current collector are commercially available polytetrafluoroethylene films.
The rest is the same as embodiment 1, and the description is omitted here.
Performance testing
The secondary batteries prepared in examples 1 to 6 and comparative example 1 were subjected to performance tests, and the test results are shown in table 1 below.
1. Charging the lithium ion secondary battery to 4.25V at a constant current of 1C at 25 ℃, then charging to 0.05C at a constant voltage of 4.25V, standing for 5min, and then discharging to 2.8V at a constant current of 1C, wherein the process is a charge-discharge cycle process, and the discharge capacity at this time is the discharge capacity of the first cycle. The lithium ion secondary battery was subjected to 200 cycles of charge and discharge tests in accordance with the above-described method, and the discharge capacity per cycle was recorded, and the results are shown in table 1. The cycle capacity retention (%) was the discharge capacity at the 200 th cycle/the discharge capacity at the first cycle × 100%.
2. And (3) liquid absorption amount test: during testing, the diaphragm sample is cut into a certain size, soaked in the electrolyte for 0.5h at normal temperature, the weight difference of the diaphragm sample per unit area before and after soaking is the liquid absorption amount, and the result is recorded in table 1.
TABLE 1
As can be seen from the above Table 1, the secondary battery prepared by the preparation method of the present invention has better capacity retention rate and liquid absorption amount compared with the prior art, the capacity retention rate reaches 88% after 200 charge-discharge cycles, and the liquid absorption amount reaches 1.85mg/cm2Compared with comparative example 1, the capacity retention rate is improved by 12%, and the liquid absorption amount is improved by 242%.
Variations and modifications to the above-described embodiments may also occur to those skilled in the art, which fall within the scope of the invention as disclosed and taught herein. Therefore, the present invention is not limited to the above-mentioned embodiments, and any obvious improvement, replacement or modification made by those skilled in the art based on the present invention is within the protection scope of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims (10)
1. The utility model provides a secondary battery, its characterized in that, includes positive plate, negative plate, diaphragm, electrolyte and casing, the diaphragm is used for separating positive plate with the negative plate, the casing is used for installing positive plate, negative plate, diaphragm and electrolyte, positive plate include the anodal mass flow body and set up in the anodal active material layer on the at least surface of anodal mass flow body, the negative plate include the negative current collector and set up in the negative active material layer on the at least surface of negative current collector, the anodal mass flow body with the negative current collector is carbon material film, carbon material film has porous structure.
2. The secondary battery according to claim 1, wherein the carbon material thin film is one of a carbon fiber thin film, a polytetrafluoroethylene film, or a carbon nanotube film metal composite film.
3. The secondary battery according to claim 2, wherein the carbon fiber thin film is prepared by: mixing and dissolving ferrocene and thiophene in a solvent according to a weight ratio of 2-10: 1-3 to obtain a mixed solution, placing the mixed solution in a cracking furnace, setting the cracking temperature to be 800-2000 ℃, and the cracking time to be 5-30 min to obtain the carbon fiber film.
4. The secondary battery according to claim 1, wherein the positive electrode active material layer includes a positive electrode active material having a core-shell structure.
5. The secondary battery according to claim 4, wherein the concentration of the positive electrode active material in the positive electrode active material layer decreases from the inside to the outside.
6. The secondary battery according to claim 5, wherein the concentration gradient of the positive electrode active material is 1% to 20%.
7. The secondary battery of claim 1, wherein the negative electrode active material layer comprises one or more negative electrode active materials of a carbon-based active material, a silicon-based active material, a tin-based active material, a nitrogen-containing active material, or an alloy-based active material.
8. The secondary battery of claim 7, wherein the negative electrode active material is a nano negative electrode active material.
9. The secondary battery according to claim 1, wherein the thickness of the positive electrode active material layer and/or the negative electrode active material layer is 4 μm to 18 μm.
10. The secondary battery according to claim 1, wherein the thickness of the positive electrode sheet and/or the negative electrode sheet is 10 μm to 50 μm.
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