CN107248592A - A kind of novel high-power lithium ion battery with high energy density - Google Patents
A kind of novel high-power lithium ion battery with high energy density Download PDFInfo
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Abstract
The invention provides a kind of novel high-power lithium ion battery with high energy density, including positive plate, negative plate, barrier film, electrolyte, lug and shell, the negative plate is mixed by negative electrode active material, cathode conductive agent and negative electrode binder, the negative electrode active material is SiO, soft carbon and/or Delanium composition, cathode conductive agent is at least one of superconduction carbon black and single-walled carbon nanotube, and negative electrode binder is at least two combinations of butadiene-styrene rubber, acrylate and sodium carboxymethylcellulose.The battery of the present invention is provided simultaneously with excellent multiplying power discharging ability and high energy density, gravimetric energy density reaches 230wh/kg, and energy density per unit volume metric density reaches more than 650wh/L, and power density reaches more than 1500w/kg, multiplying power discharging property reaches 10C, and cycle performance is up to more than 500 times.
Description
Technical field
The invention belongs to technical field of lithium ion, more particularly to a kind of high power high-energy-density and performance stabilization
Lithium ion battery and its manufacture method.
Background technology
At present, lithium ion battery possesses operating voltage height, high, lightweight specific energy, long lifespan, the low advantage of self discharge,
It is widely used in all kinds of electronic products, unmanned plane, electric automobile etc..The operating current of conventional electrical equipment is small, stand-by time
Long, conventional type lithium ion battery can meet its use requirement.And for electrical equipments such as unmanned plane, electric automobiles, in work
During need lithium ion battery persistently to provide high current, to meet the requirement of its high-power output, while being also required to high-energy
Density, extends use time, improves distance travelled.With the development of technology and the raising of user's request, to rate lithium ion
Battery proposes higher energy density output and required.
Conventional positive and negative pole material system is difficult, while meeting the requirement of high-energy-density and high power density, to there is list at present
Solely realize the scheme of high power requirement or be implemented separately high-energy-density scheme it is more, but realize high power and high-energy simultaneously
The challenge of density is very big.
The conventional energy density that improves uses the mode such as high-capacity material or high density high-pressure solid technique pole plate, but this mode
Design the high-power fan-out capability of battery not enough；The mode of power density is improved as using the pole plate compared with porous, the pole of thickness of thin
The modes such as plate can reach good power output, but the sacrifice of energy density is also larger.The direction of improvement of two aspect performances
In the presence of conflict, this is also where while realizing the difficult point of high power and high-energy.
Therefore, for realize more power and higher energy density output requirement, it is necessary to a kind of novel positive and negative pole is provided
Material system, realization takes into account high magnification and high-energy-density, and the stable lithium ion battery of performance and its manufacture method.
The content of the invention
The invention provides a kind of novel high-power lithium ion battery with high energy density, existing high power and high-energy are broken through
The technical deficiency that density can not be taken into account can meet the dual of high power and high-energy-density there is provided a kind of new material system
It is required that.
Realize the technical scheme is that：A kind of novel high-power lithium ion battery with high energy density, including positive plate,
Negative plate, barrier film, electrolyte, lug and shell, the negative plate is by negative electrode active material, cathode conductive agent and negative electrode binder
It is mixed, the negative electrode active material is SiO, soft carbon and/or Delanium composition, cathode conductive agent is superconduction carbon black and list
The combination of wall carbon nano tube, negative electrode binder is at least two combinations of butadiene-styrene rubber, acrylate and sodium carboxymethylcellulose.
The percentage by weight of each material is respectively in the negative plate：Negative electrode active material 92.5 ~ 96.2%, negative conductive
Agent 1.0 ~ 3.0%, negative electrode binder 2.8 ~ 4.5%.
The percentage by weight of single-walled carbon nanotube is 0.05-0.1% wherein in cathode conductive agent.
The percentage by weight of each material is respectively in the negative electrode active material：SiO 4-10%, soft carbon and/or artificial stone
Black 90-96%.
The negative electrode active material, cathode conductive agent and negative electrode binder are mixed and made into cathode size, by cathode size
By 80 ~ 160g/m2Surface density be coated on copper foil be made negative pole coating pole piece, by negative pole coating pole piece press 1.2 ~ 1.6g/cm3
Compacted density carry out roll-in, be punched to negative plate.
The positive plate is mixed by positive active material, positive conductive agent and positive electrode binder, wherein positive-active
Material is nickelic modified ternary material, and positive conductive agent is at least one of superconduction carbon black, CNT or graphene, just very viscous
It is Kynoar or Kynoar-hexafluoropropylene copolymer to tie agent.
The percentage by weight of each material is respectively in the positive plate：Positive active material 95 ~ 97%, positive conductive agent 1.0
~ 2.0%, positive electrode binder 2.0 ~ 3.0%.
The positive active material, positive conductive agent and positive electrode binder are mixed and made into anode sizing agent, by anode sizing agent
By 150 ~ 300g/m2Surface density be coated on aluminium foil be made positive pole coating pole piece, by positive pole coating pole piece press 3.0 ~ 3.5g/cm3
Compacted density carry out roll-in, be punched to positive plate.
The electrolyte is the mixed solution of lithium salts, organic solvent and film for additive, wherein, lithium salts is hexafluorophosphoric acid
Lithium, organic solvent is any three kinds of mixing of ethylene carbonate, dimethyl carbonate, methyl ethyl carbonate and diethyl carbonate, film forming
Additive is at least one of fluorinated ethylene carbonate, propylene sulfite or vinylene carbonate.
The percentage by weight of lithium salts, organic solvent and film for additive is respectively 71~83%, 12~14%, 5~15%.
The particle diameter D50 of the SiO materials is 10 ~ 20 μm, and specific surface area is 1.0 ~ 5.0m2/ g, the single-walled carbon nanotube
External diameter be 1~2nm.
The negative electrode active material is SiO, soft carbon and/or Delanium composition, and negative electrode active material has three kinds of combinations, the
It is a kind of be SiO with both soft carbons combination, be for second three kinds of SiO, soft carbon and Delanium combination, the third be SiO and
The combination of Delanium.
Lithium salt is 1 ~ 1.5mol/L in the electrolyte.
The beneficial effects of the invention are as follows：
（1）The present invention can significantly lift battery using SiO and soft carbon and/or the co-mixing system of Delanium, this system
Gram volume, high gram volume means that the high-energy-density of battery, soft carbon or Delanium class material capacity 300~
360mAh/g, negative pole system capacity of the present invention is up to 400~500 mAh/g, and the present invention is to make full use of high gram of SiO materials
While capacity and cyclical stability, the problem of power is taken into account with energy is solved using the good power-performance of soft carbon material.
Simultaneously using high-specific surface area and the draw ratio of special conductive agent single-walled carbon nanotube the characteristics of, caused in the formation of SiO particle surfaces
Close and firm conductive network system, stable lead can be also formed even if negative material system in the process significantly shunk and expanded
Electric network, this is the function not available for common conductive agent, and exactly this novel conductive material is solved very well significantly to be shunk
The problem of expansion and not enough cycle life.
（2）Battery is provided simultaneously with excellent multiplying power discharging ability and high energy density, and gravimetric energy density reaches
230wh/kg, energy density per unit volume metric density reaches more than 650wh/L, and power density reaches more than 1500w/kg, multiplying power discharging property
10C is reached, cycle performance is up to more than 500 times.
Brief description of the drawings
Fig. 1 is embodiment 1, the different multiplying discharge curve of the battery of the making of reference examples 1 and 2.
Embodiment
Embodiment 1
Illustrate, have by taking manufacturing process of the capacity for 3000mAh novel high-power lithium ion battery with high energy density as an example
Body implementation process is as follows：
The preparation of anode sizing agent：
With N- dimethyl pyrrolidones (NMP) for solvent, positive active material is nickelic modified ternary material (NCA)（Tianjin bar
Not Science and Technology Co., Ltd. BMT920）, conductive agent be superconduction carbon black（Super-P）And graphene, binding agent is polyvinylidene fluoride
Alkene (PVDF), NMP adds part by weight between solid matter 40 ~ 70%.The percentage by weight of each material is in the present embodiment：
NCA 95.5%, Super-P 1%, graphene 1%, PVDF 2.5%, NMP 65%.
（1）Cathode mix is prepared first：By NCA, Super-P bis- kinds of materials pre-dispersed 1 ~ 2h in batch mixer, order is led
Electric agent is dispersed in NCA surfaces and obtains cathode mix.
（2）Then PVDF is added in NMP, stirs 2 ~ 4h, prepare PVDF glues, then graphene is added to PVDF glue
Liquid is uniformly dispersed, by step（1）Middle cathode mix is added in above-mentioned finely dispersed PVDF glues in three times, high-speed stirred
De-bubbled is vacuumized after 5 ~ 8h to be coated.
The making of positive plate：The anode sizing agent prepared is coated on collector utter misery aluminium foil, two-sided deposited charge level density
In 200 ~ 320g/m2Between, coating pole piece is to be assembled after drying, roll-in, punching, completes the making of positive plate.
The preparation of cathode size：
With deionized water (H2O) it is solvent, active material is SiO, soft carbon and Delanium, and conductive agent is superconduction carbon black
(Super-P) and single-walled carbon nanotube, binding agent is the composition of butadiene-styrene rubber (SBR) and sodium carboxymethylcellulose (CMC), is gone
Ionized water adding proportion is between 100 ~ 200%.The percentage by weight of each material is respectively in the present embodiment：SiO 4.5%, soft carbon
26.4%th, Delanium 64.2%, Super-P 1%, single-walled carbon nanotube 0.1%, CMC 1.3%, SBR 2.5%, H2O is solid
The 150% of matter.
（1）Negative electrode mix is prepared first：By SiO, soft carbon, Super-P in batch mixer pre-dispersed 1 ~ 2h, make conductive agent
It is dispersed in negative electrode active surface.
（2）Then CMC is added in deionized water, stirs 3 ~ 4h, prepare the CMC aqueous solution, by single-walled carbon nanotube plus
Enter into the CMC aqueous solution and disperse 1h.By step（1）The negative electrode mix handled well adds above-mentioned CMC water after disperseing in two times
In solution, SBR is added after 6 ~ 10h of high-speed stirred, continue to stir that to vacuumize de-bubbled after 1 ~ 2h to be coated.
The making of negative plate：The cathode size prepared is coated on collector roughening copper foil, dressing surface density 80 ~
160g/m2Between, coating pole piece is to be assembled after drying, roll-in, punching, completes the making of negative plate.
The preparation of electrolyte：Lithium salts is lithium hexafluoro phosphate (LiPF6), organic solvent is ethylene carbonate (EC), carbonic acid two
The ternary mixed liquor of methyl esters (DMC), methyl ethyl carbonate (EMC), organic solvent is that weight compares EC:DMC:EMC:=1:1:1.Film forming
Additive is fluorinated ethylene carbonate（FEC）And vinylene carbonate（VC）；Lithium salts, organic solvent and film forming addition in electrolyte
The percentage by weight of agent is respectively 72%, 13%, 15%.
The making of battery before chemical conversion：By the positive and negative plate being punched and barrier film by barrier film, negative pole, barrier film, positive pole, barrier film,
The order of negative pole, which is stacked gradually, is combined into battery core, and its septation uses the individual layer PP/PE//PP three-layer membranes Jing Guo ceramic coated.
The battery core being combined into carries out ultrasonic bonding using aluminium pole ears, copper nickel plating lug；The battery core welded is put into aluminum-plastic packaged
Once encapsulated in shell；By the battery core that once encapsulates in 80 ~ 85 DEG C of temperature, toasted under conditions of vacuum≤- 0.08MPa
24h；The above-mentioned electrolyte prepared is injected to the battery core toasted；Battery core after fluid injection stands to be changed after 24 ~ 48h.
The chemical conversion of battery：Chemical conversion uses 0.05C constant current charge 2h, stands 10min, 0.2C constant current charges 2h；Then
Complete pumping and secondary encapsulation；4.2V, 1C constant current discharges to 3.0V, 1C constant currents are finally charged to using 1C constant current constant voltage patterns
Constant voltage mode charges to 3.9V, completes chemical conversion.
Embodiment 2
The preparation of anode sizing agent, electrolyte are different from embodiment 1 in the present embodiment, and remaining production method is same as Example 1.This
The preparation of the anode sizing agent of embodiment：Using NMP as solvent, active material is nickelic ternary material（NMC811), conductive agent is
Super-P and CNT (CNTs), binding agent are PVDF, and NMP adds part by weight between 50 ~ 72%.It is each in the present embodiment
The percentage by weight of material is：NMC 95.5%、Super-P 1%、CNTs 1%、PVDF 2.5%、NMP 65%.First PVDF is added
Enter into NMP, stir 2 ~ 4h, prepare PVDF glues.CNTs is added in above-mentioned PVDF glues again, 2 ~ 4h is stirred；Then will
Super-P is added in above-mentioned mixed liquor, stirs 2 ~ 4h；Finally NMC is added in above-mentioned mixed liquor, vacuumized after 4 ~ 6h of stirring de-
Bubble is to be coated.
The preparation of electrolyte：Lithium salts is lithium hexafluoro phosphate (LiPF6), organic solvent is ethylene carbonate (EC), carbonic acid two
The ternary mixed liquor of methyl esters (DMC), methyl ethyl carbonate (EMC), organic solvent is that weight compares EC:DMC:EMC:=1:1:1.Film forming
Additive is fluorinated ethylene carbonate（FEC）And vinylene carbonate（VC）；Organic solvent, lithium salts and film forming addition in electrolyte
The percentage by weight of agent is respectively 81%, 14%, 5%.
Embodiment 3
The preparation of cathode size, electrolyte are different from embodiment 1 in the present embodiment, and remaining production method is same as Example 1.This
The preparation of the cathode size of embodiment：With deionized water (H2O) it is solvent, active material is SiO, soft carbon and Delanium, is led
Electric agent is superconduction carbon black (Super-P) and single-walled carbon nanotube, and binding agent is acrylate and sodium carboxymethylcellulose (CMC)
Composition, deionized water adding proportion is between 100 ~ 200%.The percentage by weight of each material is in the present embodiment：SiO
5.7%th, soft carbon 19.25%, Delanium 68.7%, Super-P 2.30%, single-walled carbon nanotube 0.05%, acrylate
2.5%、CMC 1.5%、H2O is the 150% of solid matter.Prepare negative electrode mix first, by SiO soft carbons and Delanium,
Super-P pre-dispersed 1 ~ 2h in batch mixer, make conductive agent be dispersed in negative electrode active surface.Then CMC is added to
In ionized water, 3 ~ 4h is stirred, the CMC aqueous solution is prepared, single-walled carbon nanotube electrocondution slurry is added into CMC solution disperses 1h.Will place
The negative electrode mix managed is added in the above-mentioned CMC aqueous solution in two times, and acrylate is added after 3 ~ 5h of high-speed stirred, continues to stir
De-bubbled is vacuumized after 2 ~ 3h to be coated.
The preparation of electrolyte：Lithium salts is lithium hexafluoro phosphate (LiPF6), organic solvent is ethylene carbonate (EC), carbonic acid two
The ternary mixed liquor of methyl esters (DMC), methyl ethyl carbonate (EMC), organic solvent is that weight compares EC:DMC:EMC:=1:1:1.Film forming
Additive is fluorinated ethylene carbonate（FEC）And vinylene carbonate（VC）；Lithium salts, organic solvent and film forming addition in electrolyte
The percentage by weight of agent is respectively 83%, 12%, 5%.
Embodiment 4
The preparation of anode sizing agent is different from embodiment 1 in the present embodiment, and remaining production method is same as Example 1.The present embodiment
Anode sizing agent preparation：Using NMP as solvent, active material is nickelic ternary material（NMC811), conductive agent be Super-P and
CNT (CNTs), binding agent is PVDF, and NMP adds part by weight between 50 ~ 72%.The weight of each material in the present embodiment
Measuring percentage is：NMC 95%、Super-P 1%、CNTs 1%、PVDF 3%、NMP 65%.First PVDF is added in NMP, stirred
2 ~ 4h is mixed, PVDF glues are prepared.CNTs is added in above-mentioned PVDF glues again, 2 ~ 4h is stirred；Then Super-P is added above-mentioned
In mixed liquor, 2 ~ 4h is stirred；Finally NMC is added in above-mentioned mixed liquor, it is to be coated to vacuumize de-bubbled after 4 ~ 6h of stirring.
Embodiment 5
The preparation of anode sizing agent is different from embodiment 1 in the present embodiment, and remaining production method is same as Example 1.The present embodiment
Anode sizing agent preparation：Using NMP as solvent, active material is nickelic ternary material（NMC811), conductive agent be Super-P and
CNT (CNTs), binding agent is PVDF, and NMP adds part by weight between 50 ~ 72%.The weight of each material in the present embodiment
Measuring percentage is：NMC 97%、Super-P 0.5%、CNTs 0.5%、PVDF 2%、NMP 65%.PVDF is first added to NMP
In, 2 ~ 4h is stirred, PVDF glues are prepared.CNTs is added in above-mentioned PVDF glues again, 2 ~ 4h is stirred；Then Super-P is added
Enter in above-mentioned mixed liquor, stir 2 ~ 4h；Finally NMC is added in above-mentioned mixed liquor, it is to be coated to vacuumize de-bubbled after 4 ~ 6h of stirring
Cloth.
Embodiment 6
The preparation of cathode size is different from embodiment 1 in the present embodiment, and remaining production method is same as Example 1.The present embodiment
Cathode size preparation：With deionized water (H2O) it is solvent, active material is SiO and Delanium, and conductive agent is superconduction carbon
Black (Super-P) and single-walled carbon nanotube, binding agent are the composition of acrylate and sodium carboxymethylcellulose (CMC), go from
Sub- water adding proportion is between 100 ~ 200%.The percentage by weight of each material is in the present embodiment：SiO 9.30%, Delanium
83.62%th, superconduction carbon black 2.53%, single-walled carbon nanotube 0.05%, acrylate 3%, CMC 1.5%, H2O is solid matter
160%.Prepare negative electrode mix first, by SiO and Delanium in batch mixer pre-dispersed 1 ~ 2h, then CMC is added to
In ionized water, 3 ~ 4h is stirred, the CMC aqueous solution is prepared, single-walled carbon nanotube electrocondution slurry is added into CMC solution disperses 1h.Will place
The negative electrode mix managed is added in the above-mentioned CMC aqueous solution in two times, and acrylate is added after 3 ~ 5h of high-speed stirred, continues to stir
De-bubbled is vacuumized after 2 ~ 3h to be coated.
Embodiment 7
The preparation of cathode size is different from embodiment 1 in the present embodiment, and remaining production method is same as Example 1.The present embodiment
Cathode size preparation：With deionized water (H2O) it is solvent, active material is SiO and Delanium, and conductive agent is superconduction carbon
Black (Super-P) and single-walled carbon nanotube, binding agent are the composition of acrylate and sodium carboxymethylcellulose (CMC), go from
Sub- water adding proportion is between 100 ~ 200%.The percentage by weight of each material is in the present embodiment：SiO 3.72%, Delanium
89.28%th, Super-P 2.9%, single-walled carbon nanotube 0.1%, acrylate 2.5%, CMC 1.5%, H2O is solid matter
150%.Prepare negative electrode mix first, by SiO, Super-P in batch mixer pre-dispersed 1 ~ 2h, make conductive agent be dispersed in
Negative electrode active surface.Then CMC is added in deionized water, stirs 3 ~ 4h, the CMC aqueous solution is prepared, by single-walled carbon nanotube
Electrocondution slurry adds CMC solution and disperses 1h.The negative electrode mix handled well is added in the above-mentioned CMC aqueous solution in two times, at a high speed
Stir and acrylate is added after 3 ~ 5h, it is to be coated to vacuumize de-bubbled after 2 ~ 3h of continuation stirring.
The good characteristic of high power lithium ion battery with high energy density prepared by the checking present invention, while also having done following
Secondary contrast test, respectively as comparative example.
Embodiment 8
The preparation of cathode size and electrolyte is different from embodiment 1 in the present embodiment, remaining production method be the same as Example 1.
The preparation of cathode size in the present embodiment：With deionized water (H2O) it is solvent, active material is SiO and soft carbon, is led
Electric agent is superconduction carbon black (Super-P) and single-walled carbon nanotube, and binding agent is butadiene-styrene rubber (SBR) and sodium carboxymethylcellulose
(CMC) composition, deionized water adding proportion is between 100 ~ 200%.The percentage by weight difference of each material in the present embodiment
For：SiO 3.7%, soft carbon 88.8%, Super-P 2.91%, single-walled carbon nanotube 0.09%, CMC 2%, SBR 2.5%, H2O is
The 150% of solid matter.
The preparation of electrolyte：Lithium salts is lithium hexafluoro phosphate (LiPF6), organic solvent is ethylene carbonate (EC), carbonic acid two
The ternary mixed liquor of methyl esters (DMC), methyl ethyl carbonate (EMC), organic solvent is that weight compares EC:DMC:EMC:=1:1:1.Film forming
Additive is fluorinated ethylene carbonate（FEC）And vinylene carbonate（VC）；Lithium salts, organic solvent and film forming addition in electrolyte
The percentage by weight of agent is respectively 71%, 14%, 15%.
Embodiment 9
The preparation of cathode size and electrolyte is different from embodiment 1 in the present embodiment, remaining production method be the same as Example 1.
The preparation of cathode size in the present embodiment：With deionized water (H2O) it is solvent, active material is SiO and soft carbon, is led
Electric agent is superconduction carbon black (Super-P) and single-walled carbon nanotube, and binding agent is butadiene-styrene rubber (SBR) and sodium carboxymethylcellulose
(CMC) composition, deionized water adding proportion is between 100 ~ 200%.The percentage by weight difference of each material in the present embodiment
For：SiO 4.81%, soft carbon 91.39%, Super-P 0.9%, single-walled carbon nanotube 0.1%, CMC 1.5%, SBR 1.3%, H2O
For the 150% of solid matter.
The preparation of electrolyte：Lithium salts is lithium hexafluoro phosphate (LiPF6), organic solvent is ethylene carbonate (EC), carbonic acid two
The ternary mixed liquor of methyl esters (DMC), methyl ethyl carbonate (EMC), organic solvent is that weight compares EC:DMC:EMC:=1:1:1.Film forming
Additive is fluorinated ethylene carbonate（FEC）And vinylene carbonate（VC）；Lithium salts, organic solvent and film forming addition in electrolyte
The percentage by weight of agent is respectively 78%, 12%, 10%.
Comparative example 1
It is that cathode formula is different from the difference of embodiment 1.Without addition single-walled carbon nanotube, SiO in negative pole system:Soft carbon:People
Make graphite:Super-P:CMC:SBR:H2O=4.5: 26.4:64.2:1.1:1.3:2.5:150；Remaining be the same as Example 1.
Comparative example 2
It is the selection of electrolyte with the difference of embodiment 1.Electrolyte is constituted：Lithium salts is lithium hexafluoro phosphate (LiPF6), solvent is carbon
Vinyl acetate (EC), dimethyl carbonate (DMC), the ternary mixed liquor of methyl ethyl carbonate (EMC), solvent are that weight compares EC:DMC:
EMC=2:5:3, addition VC 2%, PS 2%, remaining be the same as Example 1 in electrolyte.
In order to verify the characteristics of present invention possesses, standard model is made using the method for embodiment 1 and embodiment 2
18650, design capacity 3000mAh.Initial performance and different multiplying 0.2C, 0.5C, 1C, 2C, 3C, 5C and 10C are carried out to battery
Discharge test, initial performance and multiplying power discharging property test result are shown in Tables 1 and 2, and rate discharge curves are shown in Fig. 1.
The embodiment battery initial performance of table 1
The multiplying power discharging property of 2 embodiment of table 1
18650,3000mAh batteries are made using the method for embodiment 1, comparative example 1 and comparative example 2, identical is used to battery
Circulation system carries out circulation test.Circulation system is：
Test temperature：25±3℃；
Charging modes：Use 3A (equivalent to 1C) constant-current constant-voltage chargings to 4.2V, cut-off current 0.03CmA；
Discharge mode：Use 15A (equivalent to 5C) constant-current discharges to 2.5V；
Cycle-index：The above-mentioned circulation system of repetition 500 times.
Circulation the results are shown in Table 3.Circulation curve is shown in Fig. 1.
The battery circulation contrast table of table 3
As known from Table 3, the circulation ability of the battery of embodiment 1 is better than comparative example 1 and comparative example 2.This is due to the institute of embodiment 1
The single-walled carbon nanotube of use can effectively ensure that the electric conductivity that charge and discharge process expands by silicium cathode, while FEC is uniform in negative pole
Film forming improves circulation reliability, it is ensured that battery possesses longer service life.
In summary, novel high-power high energy density cells of the present invention, by using nickelic ternary material NCA or
NMC811, SiO such as mix at the energy density that new material system effectively lifts battery with soft carbon, while using single
The conductive agents such as pipe, graphene improve the multiplying power discharging property of battery, and effective film for additive FEC is added in the electrolytic solution, improve
Battery is circulated and storage capacity in high-multiplying power discharge.
It should be noted that the embodiment according to disclosed in foregoing invention specification, technology of the art
Personnel can also be made an amendment to above-mentioned embodiment, supplement, change or be substituted using similar mode.Therefore, the present invention simultaneously
It is not limited to embodiment disclosed and described above, any simple modification made for the present invention, change and equivalent
In structure change, the protection domain for still belonging to technical solution of the present invention.
Claims (10)
1. a kind of novel high-power lithium ion battery with high energy density, including positive plate, negative plate, barrier film, electrolyte, lug and
Shell, it is characterised in that：The negative plate is mixed by negative electrode active material, cathode conductive agent and negative electrode binder, described
Negative electrode active material is SiO, soft carbon and/or Delanium composition, and cathode conductive agent is superconduction carbon black and single-walled carbon nanotube
Combination, negative electrode binder is at least two combinations of butadiene-styrene rubber, acrylate and sodium carboxymethylcellulose.
2. novel high-power lithium ion battery with high energy density according to claim 1, it is characterised in that the negative plate
In the percentage by weight of each material be respectively：Negative electrode active material 92.5 ~ 96.2%, cathode conductive agent 1.0 ~ 3.0%, negative pole glue
Tie agent 2.8 ~ 4.5%.
3. novel high-power lithium ion battery with high energy density according to claim 1, it is characterised in that the negative pole is lived
The percentage by weight of each material is respectively in property material：SiO 4-10%, soft carbon and/or Delanium 90-96%.
4. the novel high-power lithium ion battery with high energy density according to claim 1-3, it is characterised in that will be described negative
Pole active material, cathode conductive agent and negative electrode binder are mixed and made into cathode size, and cathode size is pressed into 80 ~ 160g/m2Face
Density, which is coated on copper foil, is made negative pole coating pole piece, and negative pole coating pole piece is pressed into 1.2 ~ 1.6g/cm3Compacted density carry out roller
Press, be punched to negative plate.
5. the novel high-power lithium ion battery with high energy density described in claim 1, it is characterised in that the positive plate is by just
Pole active material, positive conductive agent and positive electrode binder are mixed, and wherein positive active material is nickelic modified ternary material,
Positive conductive agent is at least one of superconduction carbon black, CNT or graphene, and positive electrode binder is Kynoar or poly- inclined
Viton copolymers.
6. novel high-power lithium ion battery with high energy density according to claim 5, it is characterised in that the positive plate
In the percentage by weight of each material be respectively：Positive active material 95 ~ 97%, positive conductive agent 1.0 ~ 2.0%, positive electrode binder
2.0~3.0%。
7. the novel high-power lithium ion battery with high energy density according to claim 5-6, it is characterised in that by it is described just
Pole active material, positive conductive agent and positive electrode binder are mixed and made into anode sizing agent, and anode sizing agent is pressed into 150 ~ 300g/m2Face
Density, which is coated on aluminium foil, is made positive pole coating pole piece, and positive pole coating pole piece is pressed into 3.0 ~ 3.5g/cm3Compacted density carry out roller
Press, be punched to positive plate.
8. novel high-power lithium ion battery with high energy density according to claim 1, it is characterised in that the electrolyte
For the mixed solution of lithium salts, organic solvent and film for additive, wherein, lithium salts is lithium hexafluoro phosphate, and organic solvent is ethylene
Alkene ester, dimethyl carbonate, any three kinds of mixing of methyl ethyl carbonate and diethyl carbonate, film for additive is fluoro ethylene carbonate
At least one of ester, propylene sulfite or vinylene carbonate.
9. novel high-power lithium ion battery with high energy density according to claim 8, it is characterised in that lithium salts, organic
The percentage by weight of solvent and film for additive is respectively 71~83%, 12~14%, 5~15%.
10. novel high-power lithium ion battery with high energy density according to claim 1, it is characterised in that the SiO materials
The particle diameter D50 of material is 10 ~ 20 μm, and specific surface area is 1.0 ~ 5.0m2/ g, the external diameter of the single-walled carbon nanotube is 1~2nm.
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