CN106602030A - Low-temperature composite lithium iron phosphate material, positive plate and lithium ion battery - Google Patents
Low-temperature composite lithium iron phosphate material, positive plate and lithium ion battery Download PDFInfo
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Abstract
The invention relates to a low-temperature composite lithium iron phosphate material, a positive plate and a lithium ion battery, and belongs to the technical field of lithium ion batteries. The composite lithium iron phosphate material provided by the invention is prepared by the preparation method comprising the following steps of uniformly mixing the following materials in percentages by weight: 90-95% of lithium iron phosphate, 0.5-1% of graphene, 1-4% of carbon nano tubes and 1-5% of conductive carbon black, and then keeping warm for 4-8h in the atmosphere of nitrogen at temperature of 600-750 DEG C, thus obtaining the material. The composite lithium iron phosphate material provided by the invention is prepared by compounding the lithium iron phosphate, the graphene, the carbon nano tubes and the conductive carbon black, and keeping warm, and thus has excellent super-low temperature performance. The lithium ion battery using the composite lithium iron phosphate provided by the invention is excellent in low temperature performance, high in security performance and long in cycle life.
Description
Technical field
The present invention relates to a kind of low temperature composite lithium iron phosphate material, anode pole piece, lithium ion battery, belong to lithium ion battery
Technical field.
Background technology
In recent years, lithium ion battery as running voltage is high, energy density is big, memory-less effect, have extended cycle life, without dirt
The advantages of dye, it has been applied to more and more widely in consumption, power, energy storage and special cells, with the expansion in market, frigid zone ground
Area is also increasing to the demand of lithium ion battery, it is desirable to battery -40 DEG C～55 DEG C can normal works, but in low temperature environment
Under, conventional lithium ion low temperature performance is poor：Cannot discharge when less than -20 DEG C or discharge time is short；Low temperature discharge multiplying power is little,
The continuous discharge of below the 0.5C electric currents of more than -20 DEG C of low temperature is only applicable to generally, it is impossible to meet height required during low-temperature working
Power requirement；Battery cannot charge less than less than 0 DEG C.
The content of the invention
It is an object of the invention to provide a kind of low temperature composite lithium iron phosphate material, with excellent ultralow temperature performance.
Present invention also offers a kind of anode pole piece and a kind of lithium ion battery.
In order to realize object above, the technical scheme adopted by the low temperature composite lithium iron phosphate material of the present invention is：
A kind of low temperature composite lithium iron phosphate material, is obtained using the preparation method for comprising the steps：With mass percent
Meter, the conductive black of 90～95% LiFePO4,0.5～1% Graphene, 1～4% CNT and 1～5% is mixed
Close uniform, then at 600～750 DEG C, 4～8h is incubated under nitrogen atmosphere, is obtained final product.
The low temperature composite lithium iron phosphate material of the present invention, by LiFePO4, Graphene, CNT and conductive carbon black
Compounding, insulation, the composite lithium iron phosphate material for obtaining have excellent ultralow temperature performance.
The nitrogen is pure nitrogen gas.
Preferably, the preparation method of above-mentioned low temperature composite lithium iron phosphate material also includes：After the completion of insulation, then carry out powder
It is broken, obtain the granule that D50 is not more than 1 μm.Further can be carried by crushing the grain diameter of control composite lithium iron phosphate material
Rise the cryogenic property of composite lithium iron phosphate material.
The technical scheme that adopted of the anode pole piece for adopting above-mentioned low temperature composite lithium iron phosphate material of the present invention for：It is a kind of
Using the anode pole piece of above-mentioned low temperature composite lithium iron phosphate material.
Preferably, the anode pole piece is prepared using the method for comprising the following steps：By percentage to the quality, 90 are taken
～95% composite lithium iron phosphate material and 5～10% binding agent；Composite lithium iron phosphate, binding agent are mixed homogeneously with solvent
Coating on a current collector, is dried, obtains final product.
The anode pole piece of the present invention, using above-mentioned low temperature composite lithium iron phosphate material, LiFePO4 week in the composite
Enclose by the parcel of the conductive agent uniform close of graininess, lamellar and tubulose, form excellent conductive network, greatly reduce positive pole pole
The polarization and internal resistance of piece, with excellent ultralow temperature performance.
Preferably, the collector is aluminium foil that surface roughness Ra is 20～100nm.Aluminium foil is to adopt 0.001mol/L
Dilute hydrochloric acid process and wash what is obtained.
Preferably, the thickness of the anode pole piece is not more than 120 μm.By the surface roughness and pole piece that control collector
Thickness can further optimize anode pole piece so that lithium ion resistance for being subject in the transmission of solid phase, liquid phase and interface can be reduced
Cryogenic property.The lug of the anode pole piece is unilateral full lug.
The technical scheme that adopted of the lithium ion battery for adopting above-mentioned anode pole piece of the present invention for：It is a kind of using it is above-mentioned just
The lithium ion battery of pole pole piece.
, under low temperature charge and discharge electric polarization, low temperature performance excellent, security performance are high, cycle life for the lithium ion battery of the present invention
It is long, -40 DEG C to 0 DEG C of heavy-current discharge can be realized, -20 DEG C to 0 DEG C of 0.5C electric currents charge, and the quick charge and discharge of room temperature
Performance.
Preferably, above-mentioned lithium ion battery, including by cathode pole piece and anode pole piece, the cathode pole piece includes negative pole collection
Fluid and the negative electrode material layer being arranged on negative current collector, the negative electrode material layer include that negative material is added with negative pole
Agent, the negative material are mainly consisted of the following components in percentage by weight：Negative electrode active material 90～95%, conductive agent 2～
5%th, binding agent 3～5%, the cathode additive agent are the mass ratio of ethylene carbonate, the negative material and cathode additive agent
For 100:1～5.Cathode pole piece can be improved in coating dry run thermostability as cathode additive agent using ethylene carbonate.
The cathode pole piece is obtained using the preparation method for comprising the following steps：
1) negative electrode active material of formula ratio, conductive agent, binding agent mix homogeneously are taken, negative pole compound is obtained；
2) by step 1) obtained by negative pole compound, cathode additive agent and water mix homogeneously make slurry, be coated in afflux
On body, it is dried, obtains final product.
By the ratio for controlling each material of negative material, and the consumption of ethylene carbonate, further can reduce lithium from
The resistance that son is subject in the transmission of solid phase, liquid phase and interface.
Preferably, step 1) in, by percentage to the quality, negative electrode active material by 50～70% Delanium and 30～
50% soft charcoal composition.The D50 of Delanium is not more than 5 μm.
Preferably, step 1) in, the conductive agent is the matter of the mixture of Graphene and carbon fiber, Graphene and carbon fiber
Amount is than being 1:1～3.
Preferably, step 1) in, mixture of the binding agent for CMC and LA binding agents.CMC the and LA binding agents
Mass ratio is 1:2～3.
Preferably, step 2) described in water be deionized water.
The lithium ion battery of the present invention is obtained using the preparation method for comprising the following steps：By cathode pole piece, barrier film and negative
Pole pole piece coiling Cheng Xin, battery core is placed in housing and electrolyte sealing is injected.
The barrier film is using the one kind in PP, PE and PP/PE compound polyolefin based materials.The thickness of barrier film is not more than 15
μm.The material of the shell is aluminum plastic film, metallic aluminium, the one kind in rustless steel.
Description of the drawings
Low temperature discharge curves of the Fig. 1 for the lithium ion battery of embodiment 1；
Low temperature discharge curves of the Fig. 2 for the lithium ion battery of comparative example；
Low temperature charging curves of the Fig. 3 for the lithium ion battery of embodiment 1；
Low temperature charging curves of the Fig. 4 for the lithium ion battery of comparative example.
Specific embodiment
Technical scheme is further described below in conjunction with specific embodiment.
Aluminium foil employed in specific embodiment is to be processed using the dilute hydrochloric acid of 0.001mol/L and wash what is obtained.Institute
For pure nitrogen gas, purity is 99.999% to the nitrogen for adopting.
Embodiment 1
The low temperature composite lithium iron phosphate material of the present embodiment, adopts and prepares with the following method：By percentage to the quality, will
95% LiFePO4,0.5% Graphene, 2% CNT and 2.5% conductive black mix homogeneously, then 720
DEG C, 4h is incubated under nitrogen atmosphere, then is ground into the granule that D50 is 1 μm, obtained final product.
The anode pole piece of the employing low temperature composite lithium iron phosphate material of the present embodiment, using the preparation side for comprising the following steps
Method is obtained：By percentage to the quality, 95% composite lithium iron phosphate material and 5% binding agent are taken；By composite lithium iron phosphate material
Material, binding agent are mixed homogeneously with solvent, cross 150 mesh sieves, and it is 20nm to be coated uniformly on the surface roughness Ra Jing after dilute hydrochloric acid process
Aluminium foil surface, side lug is left white 20nm, is dried, then suppress thickness is 120 μm of anode pole piece.The binding agent is
PVDF, the solvent are N-Methyl pyrrolidone.
The lithium ion battery of the present embodiment, including cathode pole piece and above-mentioned anode pole piece, the cathode pole piece include negative pole
Collector and the negative electrode material layer being arranged on negative current collector, the negative electrode material layer include that negative material is added with negative pole
Agent；The negative material is mainly consisted of the following components in percentage by weight：Negative electrode active material 95%, conductive agent 2%, bonding
Agent 3%；The cathode additive agent is ethylene carbonate；The negative material is 100 with the mass ratio of cathode additive agent:3；It is described
Negative electrode active material is made up of Delanium and soft charcoal, and by percentage to the quality, Delanium accounts for 60%, and soft charcoal accounts for 40%, people
The D50 for making graphite is 5 μm；The conductive agent is that the mass ratio of the mixture of Graphene and carbon fiber, Graphene and carbon fiber is
1:1；Mixture of the binding agent for CMC and LA binding agents, the mass ratio of CMC and LA binding agents is 1:2.
The preparation method of cathode pole piece is comprised the following steps:
1) Delanium and soft charcoal mix homogeneously of formula ratio are taken, negative electrode active material is obtained；Take the negative electrode active of formula ratio
Material, conductive agent, binding agent mix homogeneously, obtain negative pole compound；
2) by step 1) obtained by negative pole compound, cathode additive agent and deionized water mix homogeneously make slurry, cross 150
Mesh sieve, is coated on Copper Foil, and side lug is left white 15nm, is dried, and compacting is cut according to required size, and it is 70 μm that thickness is obtained
Cathode pole piece.
The anode pole piece of the present embodiment, cathode pole piece and PP barrier film Jing laminations are wound into into an overall battery core, then use aluminum
Plastic film is packaged, it is vacuum dried after injection electrolyte, stand 48 hours, to electrolyte fully infiltrate positive and negative plate and every
After film, then activated batteries are melted into by discharge and recharge, that is, the lithium ion battery of the present embodiment is obtained；The thickness of barrier film is 15 μm.
Embodiment 2
The low temperature composite lithium iron phosphate material of the present embodiment, adopts and prepares with the following method：By percentage to the quality, will
90% LiFePO4,1% Graphene, 4% CNT and 5% conductive black mix homogeneously, then at 700 DEG C,
6h is incubated under nitrogen atmosphere, then is ground into the granule that D50 is 0.7 μm, obtained final product.
The anode pole piece of the employing low temperature composite lithium iron phosphate material of the present embodiment, using the preparation side for comprising the following steps
Method is obtained：By percentage to the quality, 95% composite lithium iron phosphate material and 5% binding agent are taken；By composite lithium iron phosphate material
Material, binding agent are mixed homogeneously with solvent, cross 150 mesh sieves, and it is 100nm to be coated uniformly on the surface roughness Ra Jing after dilute hydrochloric acid process
Aluminium foil surface, side lug is left white 20nm, is dried, then suppress thickness is 120 μm of anode pole piece.The binding agent is
PVDF, the solvent are N-Methyl pyrrolidone.
The lithium ion battery of the present embodiment, including the anode pole piece and cathode pole piece of the present embodiment, the cathode pole piece bag
Negative current collector and the negative electrode material layer being arranged on negative current collector are included, the negative electrode material layer includes negative material and bears
Pole additive；The negative material is mainly consisted of the following components in percentage by weight：Negative electrode active material 95%, conductive agent
2%th, binding agent 3%；The cathode additive agent is ethylene carbonate；The negative material with the mass ratio of cathode additive agent is
100:3；The negative electrode active material is made up of Delanium and soft charcoal, and by percentage to the quality, Delanium accounts for 70%, soft charcoal
30% is accounted for, the D50 of Delanium is 3 μm；The conductive agent is the mixture of Graphene and carbon fiber, Graphene and carbon fiber
Mass ratio is 1:1；Mixture of the binding agent for CMC and LA binding agents, the mass ratio of CMC and LA binding agents is 1:2.
The preparation method of cathode pole piece is with embodiment 1.
The anode pole piece of the present embodiment, cathode pole piece and PE barrier film Jing laminations are wound into into an overall battery core, then use aluminum
Plastic film is packaged, it is vacuum dried after injection electrolyte, stand 48 hours, to electrolyte fully infiltrate positive and negative plate and every
After film, then activated batteries are melted into by discharge and recharge, that is, the lithium ion battery of the present embodiment is obtained；The thickness of barrier film is 12 μm.
Embodiment 3
The low temperature composite lithium iron phosphate material of the present embodiment, adopts and prepares with the following method：By percentage to the quality, will
95% LiFePO4,0.5% Graphene, 2% CNT and 2.5% conductive black mix homogeneously, then 680
DEG C, 7h is incubated under nitrogen atmosphere, then is ground into the granule that D50 is 0.4 μm, obtained final product.
The anode pole piece of the employing low temperature composite lithium iron phosphate material of the present embodiment, using the preparation side for comprising the following steps
Method is obtained：By percentage to the quality, 92% composite lithium iron phosphate material and 8% binding agent are taken；By composite lithium iron phosphate material
Material, binding agent are mixed homogeneously with solvent, cross 150 mesh sieves, and it is 80nm to be coated uniformly on the surface roughness Ra Jing after dilute hydrochloric acid process
Aluminium foil surface, side lug is left white 20nm, is dried, then suppress thickness is 120 μm of anode pole piece.The binding agent is
PVDF, the solvent are N-Methyl pyrrolidone.
The lithium ion battery of the present embodiment, including cathode pole piece and above-mentioned anode pole piece, the cathode pole piece include negative pole
Collector and the negative electrode material layer being arranged on negative current collector, the negative electrode material layer include that negative material is added with negative pole
Agent；The negative material is mainly consisted of the following components in percentage by weight：Negative electrode active material 92%, conductive agent 4%, bonding
Agent 4%；The cathode additive agent is ethylene carbonate；The negative material is 100 with the mass ratio of cathode additive agent:2；It is described
Negative electrode active material is made up of Delanium and soft charcoal, and by percentage to the quality, Delanium accounts for 70%, and soft charcoal accounts for 30%, people
The D50 for making graphite is 1 μm；The conductive agent is that the mass ratio of the mixture of Graphene and carbon fiber, Graphene and carbon fiber is
1:3；Mixture of the binding agent for CMC and LA binding agents, the mass ratio of CMC and LA binding agents is 1:3.
The preparation method of cathode pole piece is with embodiment 1.
The anode pole piece of the present embodiment, cathode pole piece and PP/PE composite diaphragm Jing laminations are wound into into an overall battery core,
It is packaged with aluminum plastic film again, vacuum dried rear injection electrolyte stands 24 hours, fully infiltrates positive and negative electrode to electrolyte
After piece and barrier film, then activated batteries are melted into by discharge and recharge, that is, the lithium ion battery of the present embodiment is obtained；The thickness of barrier film is 12
μm。
Embodiment 4
The low temperature composite lithium iron phosphate material of the present embodiment, adopts and prepares with the following method：By percentage to the quality, will
94.3% LiFePO4,0.7% Graphene, 1% CNT and 4% conductive black mix homogeneously, then 600
DEG C, 7h is incubated under nitrogen atmosphere, then is ground into the granule that D50 is 0.5 μm, obtained final product.
The anode pole piece of the employing low temperature composite lithium iron phosphate material of the present embodiment, using the preparation side for comprising the following steps
Method is obtained：By percentage to the quality, 90% composite lithium iron phosphate material and 10% binding agent are taken；By composite lithium iron phosphate material
Material, binding agent are mixed homogeneously with solvent, cross 150 mesh sieves, and it is 50nm to be coated uniformly on the surface roughness Ra Jing after dilute hydrochloric acid process
Aluminium foil surface, side lug is left white 20nm, is dried, then suppress thickness is 120 μm of anode pole piece.The binding agent is
PVDF, the solvent are N-Methyl pyrrolidone.
The lithium ion battery of the present embodiment, including negative plate and above-mentioned anode pole piece, the cathode pole piece include negative pole collection
Fluid and the negative electrode material layer being arranged on negative current collector, the negative electrode material layer include that negative material is added with negative pole
Agent；The negative material is mainly consisted of the following components in percentage by weight：Negative electrode active material 90%, conductive agent 5%, bonding
Agent 5%；The cathode additive agent is ethylene carbonate；The negative material is 100 with the mass ratio of cathode additive agent:5；It is described
Negative electrode active material is made up of Delanium and soft charcoal, and by percentage to the quality, Delanium accounts for 50%, and soft charcoal accounts for 50%, people
The D50 for making graphite is 0.5 μm；The conductive agent is the mass ratio of the mixture of Graphene and carbon fiber, Graphene and carbon fiber
For 1:2；Mixture of the binding agent for CMC and LA binding agents, the mass ratio of CMC and LA binding agents is 1:3.
The preparation method of cathode pole piece is with embodiment 1.
The anode pole piece of the present embodiment, cathode pole piece and PP barrier film Jing laminations are wound into into an overall battery core, then use aluminum
Plastic film is packaged, it is vacuum dried after injection electrolyte, stand 38 hours, to electrolyte fully infiltrate positive and negative plate and every
After film, then activated batteries are melted into by discharge and recharge, that is, the lithium ion battery of the present embodiment is obtained；The thickness of barrier film is 15 μm.
Embodiment 5
The low temperature composite lithium iron phosphate material of the present embodiment, adopts and prepares with the following method：By percentage to the quality, will
94.7% LiFePO4,0.8% Graphene, 3.5% CNT and 1% conductive black mix homogeneously, Ran Hou
750 DEG C, 8h is incubated under nitrogen atmosphere, then is ground into the granule that D50 is 0.1 μm, obtained final product.
The anode pole piece of the employing low temperature composite lithium iron phosphate material of the present embodiment, using the preparation side for comprising the following steps
Method is obtained：By percentage to the quality, 93% composite lithium iron phosphate material and 7% binding agent are taken；By composite lithium iron phosphate material
Material, binding agent are mixed homogeneously with solvent, cross 150 mesh sieves, and it is 30nm to be coated uniformly on the surface roughness Ra Jing after dilute hydrochloric acid process
Aluminium foil surface, side lug is left white 20nm, is dried, then suppress thickness is 120 μm of anode pole piece.The binding agent is
PVDF, the solvent are N-Methyl pyrrolidone.
The lithium ion battery of the present embodiment, including cathode pole piece and above-mentioned anode pole piece, the cathode pole piece include negative pole
Collector and the negative electrode material layer being arranged on negative current collector, the negative electrode material layer include that negative material is added with negative pole
Agent；The negative material is mainly consisted of the following components in percentage by weight：Negative electrode active material 93%, conductive agent 3%, bonding
Agent 4%；The cathode additive agent is ethylene carbonate；The negative material is 100 with the mass ratio of cathode additive agent:1；It is described
Negative electrode active material is made up of Delanium and soft charcoal, and by percentage to the quality, Delanium accounts for 55%, and soft charcoal accounts for 45%, people
The D50 for making graphite is 0.1 μm；The conductive agent is the mass ratio of the mixture of Graphene and carbon fiber, Graphene and carbon fiber
For 1:3；Mixture of the binding agent for CMC and LA binding agents, the mass ratio of CMC and LA binding agents is 1:3.
The preparation method of cathode pole piece is with embodiment 1.
The anode pole piece of the present embodiment, cathode pole piece and PE barrier film Jing laminations are wound into into an overall battery core, then use aluminum
Plastic film is packaged, it is vacuum dried after injection electrolyte, stand 36 hours, to electrolyte fully infiltrate positive and negative plate and every
After film, then activated batteries are melted into by discharge and recharge, that is, the lithium ion battery of the present embodiment is obtained；The thickness of barrier film is 12 μm.
Comparative example
The preparation method of comparative example lithium ion battery is as follows：
Prepared by anode pole piece, by 90～95% LiFePO4s, 3～5% conductive blacks, 3～5% binding agent PVDF and NMP
After mix homogeneously, 150 mesh sieves are crossed, the utter misery aluminium foil surface sold in market is coated uniformly on, side lug is left white 20nm, be dried,
Then suppress thickness is 160 μm of anode pole piece.
Prepared by cathode pole piece, 90～95% negative electrode active material Delaniums, 3～5% conductive blacks, 1.5～2% are glued
Knot agent CMC, 2～3.5% binding agent SBR and deionized water mix homogeneously make slurry, cross 150 mesh sieves, are coated on Copper Foil,
Side lug is left white 15nm, is dried, and compacting is cut according to required size, and prepared thickness is 120 μm of cathode pole piece.
Above-mentioned anode pole piece, cathode pole piece and PP barrier film Jing laminations are wound into into an overall battery core, then are entered with aluminum plastic film
Row encapsulation, vacuum dried rear injection electrolyte, stands 48 hours, fully infiltrates after positive and negative plate and barrier film to electrolyte, then
Activated batteries are melted into by discharge and recharge, that is, the lithium ion battery of contrast is obtained；The thickness of barrier film is 24 μm.
Experimental example 1
At -20 DEG C and -40 DEG C, the lithium ion battery of testing example 1～5 and the lithium ion battery of comparative example are put respectively
Capacitance conservation rate, the discharge-rate of test is 5C, and the blanking voltage of electric discharge is 2.0V, and test result is shown in Table 1.
Table 1 applies the discharge capacity of lithium ion battery conservation rate test result of example and comparative example
| Discharge rate | 25℃@0.5C | 20 DEG C of@5C of ﹣ | 40 DEG C of@5C of ﹣ |
| Embodiment 1 | 100% | 92.8% | 85.1% |
| Embodiment 2 | 100% | 92.5% | 84.9% |
| Embodiment 3 | 100% | 92.6% | 85.0% |
| Embodiment 4 | 100% | 92.8% | 85.2% |
| Embodiment 5 | 100% | 92.5% | 84.8% |
| Comparative example | 100% | 50.1% | / |
The discharge curve of the discharge capacitance test of the lithium ion battery of embodiment 1 is as shown in Figure 1；The lithium of comparative example
The discharge curve of the discharge capacitance test of ion battery is as shown in Figure 2.
Experimental example 2
At -20 DEG C, the charging of the lithium ion battery of the lithium ion battery and comparative example of testing example 1～5 respectively is held
Amount conservation rate, the rate of charge of test are respectively 0.5C and 1C, and the blanking voltage of charging is 3.65V, and test result is shown in Table 2.
The lithium ion battery charging capacity conservation rate test result of 2 embodiment of table and comparative example
| Charge rate | 25℃@0.5C | 20 DEG C [email protected] of ﹣ | 20 DEG C of@1C of ﹣ |
| Embodiment 1 | 100% | 91.2% | 85.4% |
| Embodiment 2 | 100% | 90.9% | 85.5% |
| Embodiment 3 | 100% | 91.2% | 85.1% |
| Embodiment 4 | 100% | 91.3% | 85.2% |
| Embodiment 5 | 100% | 91.2% | 85.1% |
| Comparative example | 100% | 21.3% | 9.2% |
The charging curve of the charging capacity conservation rate test of the lithium ion battery of embodiment 1 is as shown in Figure 3；The lithium of comparative example
The charging curve of the charging capacity conservation rate test of ion battery is as shown in Figure 4.
From experimental example 1 and the test result of experimental example 2, compared to prior art, the lithium ion battery of the present invention exists
Under low temperature charge and discharge electric polarization, -40 DEG C to 0 DEG C of heavy-current discharge can be realized, -20 DEG C to 0 DEG C of 0.5C electric currents charge, have
More excellent low temperature charging performance, and have the advantages that to have extended cycle life；Additionally, the lithium ion battery of the present invention also has
The quick charging-discharging performances of good room temperature.Meanwhile, the lithium ion battery of the present invention is wound using full lug, need not cut lug,
Process is simple, reduction copper aluminium foil are wasted.
Claims (10)
1. a kind of low temperature composite lithium iron phosphate material, it is characterised in that：Obtained using the preparation method for comprising the steps：With matter
Amount percentages, by leading for 90～95% LiFePO4,0.5～1% Graphene, 1～4% CNT and 1～5%
Electric white carbon black mix homogeneously, then at 600～750 DEG C, is incubated 4～8h, obtains final product under nitrogen atmosphere.
2. low temperature composite lithium iron phosphate material according to claim 1, it is characterised in that：Also include：After the completion of insulation, then
Crushed, obtained the granule that D50 is not more than 1 μm.
3. a kind of anode pole piece using low temperature composite lithium iron phosphate material as claimed in claim 1.
4. anode pole piece according to claim 3, it is characterised in that：Including collector, the collector is rough surface
Degree Ra is the aluminium foil of 20～100nm.
5. anode pole piece according to claim 3, it is characterised in that：The thickness of the anode pole piece is not more than 120 μm.
6. a kind of lithium ion battery of the anode pole piece using as described in any one in claim 3～5.
7. lithium ion battery according to claim 6, it is characterised in that：Including cathode pole piece and the anode pole piece, institute
Stating cathode pole piece includes negative current collector and the negative electrode material layer being arranged on negative current collector, and the negative electrode material layer includes
Negative material and cathode additive agent, the negative material are mainly consisted of the following components in percentage by weight：Negative electrode active material
90～95%, conductive agent 2～5%, binding agent 3～5%, the cathode additive agent be ethylene carbonate, the negative material with
The mass ratio of cathode additive agent is 100:1～5.
8. lithium ion battery according to claim 7, it is characterised in that：The cathode pole piece adopts what is comprised the steps
Method is prepared：
1) negative electrode active material of formula ratio, conductive agent, binding agent mix homogeneously are taken, negative pole compound is obtained；
2) by step 1) obtained by negative pole compound, cathode additive agent and water mix homogeneously make slurry, coating on a current collector,
It is dried, obtains final product.
9. lithium ion battery according to claim 7, it is characterised in that：By percentage to the quality, the negative electrode active material
Matter is made up of 50～70% Delanium and 30～50% soft charcoal.
10. lithium ion battery according to claim 7, it is characterised in that：The conductive agent is Graphene and carbon fiber
The mass ratio of mixture, Graphene and carbon fiber is 1:1～3.
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| WO2020040959A1 (en) * | 2018-08-20 | 2020-02-27 | Cabot Corporation | Compositions containing conductive additives, related electrodes and related batteries |
| CN113036125A (en) * | 2019-12-24 | 2021-06-25 | 广州汽车集团股份有限公司 | Positive electrode slurry, positive electrode plate, lithium ion cell, lithium ion battery pack and application |
| CN114361446A (en) * | 2021-12-29 | 2022-04-15 | 常州锂源新能源科技有限公司 | A kind of test method of low temperature performance of lithium iron phosphate cathode material |
| EP3931895B1 (en) | 2019-02-25 | 2023-06-07 | Speira GmbH | Aluminium foil for battery electrodes and production method |
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