CN107403907A - A kind of lithium battery cathode plate and preparation method thereof - Google Patents
A kind of lithium battery cathode plate and preparation method thereof Download PDFInfo
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- CN107403907A CN107403907A CN201710607683.0A CN201710607683A CN107403907A CN 107403907 A CN107403907 A CN 107403907A CN 201710607683 A CN201710607683 A CN 201710607683A CN 107403907 A CN107403907 A CN 107403907A
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- lithium
- cathode plate
- lithium battery
- battery cathode
- intermediate material
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- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 95
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 86
- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- 239000000463 material Substances 0.000 claims abstract description 72
- 239000002002 slurry Substances 0.000 claims abstract description 14
- 239000000758 substrate Substances 0.000 claims abstract description 13
- 238000000034 method Methods 0.000 claims abstract description 6
- 239000011248 coating agent Substances 0.000 claims description 18
- 238000000576 coating method Methods 0.000 claims description 18
- 239000011149 active material Substances 0.000 claims description 14
- 239000003610 charcoal Substances 0.000 claims description 14
- 239000002994 raw material Substances 0.000 claims description 14
- 239000011230 binding agent Substances 0.000 claims description 10
- 239000006258 conductive agent Substances 0.000 claims description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 9
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 7
- 229910052802 copper Inorganic materials 0.000 claims description 7
- 239000010949 copper Substances 0.000 claims description 7
- 229910002804 graphite Inorganic materials 0.000 claims description 7
- 239000010439 graphite Substances 0.000 claims description 7
- 239000003960 organic solvent Substances 0.000 claims description 7
- 239000006245 Carbon black Super-P Substances 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 6
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical group C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 6
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical group CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 claims description 5
- 239000002033 PVDF binder Substances 0.000 claims description 5
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims description 5
- HMDDXIMCDZRSNE-UHFFFAOYSA-N [C].[Si] Chemical compound [C].[Si] HMDDXIMCDZRSNE-UHFFFAOYSA-N 0.000 claims description 4
- 229910021385 hard carbon Inorganic materials 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
- 229910021384 soft carbon Inorganic materials 0.000 claims description 3
- 229910052799 carbon Inorganic materials 0.000 claims description 2
- 239000002904 solvent Substances 0.000 claims 1
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 abstract description 4
- 238000004146 energy storage Methods 0.000 abstract description 4
- 229910001416 lithium ion Inorganic materials 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 2
- 210000001787 dendrite Anatomy 0.000 description 5
- 238000003756 stirring Methods 0.000 description 5
- 239000012530 fluid Substances 0.000 description 3
- 238000001291 vacuum drying Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- WFLOTYSKFUPZQB-OWOJBTEDSA-N (e)-1,2-difluoroethene Chemical compound F\C=C\F WFLOTYSKFUPZQB-OWOJBTEDSA-N 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 210000004027 cell Anatomy 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000007086 side reaction Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 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
- 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
- H01M4/134—Electrodes based on metals, Si or alloys
-
- 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
- H01M4/04—Processes of manufacture in general
- H01M4/0402—Methods of deposition of the material
- H01M4/0404—Methods of deposition of the material by coating on electrode collectors
-
- 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
- H01M4/04—Processes of manufacture in general
- H01M4/043—Processes of manufacture in general involving compressing or compaction
- H01M4/0435—Rolling or calendering
-
- 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
- H01M4/139—Processes of manufacture
- H01M4/1395—Processes of manufacture of electrodes based on metals, Si or alloys
-
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
A kind of lithium battery cathode plate and preparation method thereof, the present invention relates to lithium-ion energy storage field.The invention solves traditional lithium battery cathode plate battery efficiency and cycle life are low, the big technical problem of negative plate thickness.A kind of lithium battery cathode plate includes collector, intermediate material layer and metallic lithium layer, wherein, metallic lithium layer is attached on intermediate material layer, and collector is under intermediate material layer.Method：First, intermediate material layer slurry is formed；The 2nd, intermediate material layer slurry is coated to the surface of collector；3rd, roll-in lithium band；The 4th, lithium belt roller is pressed onto to the intermediate material layer side of collector substrate.This method is safer, more time saving simple, while the adhesion of metallic lithium layer and intermediate material layer is very good, realizes being uniformly distributed for lithium metal, and the content of lithium metal can be controlled by the thickness of lithium band, further increases the effect of cathode of lithium battery.Lithium battery cathode plate prepared by the present invention is used for lithium battery energy storage battery field.
Description
Technical field
The present invention relates to lithium-ion energy storage field.
Background technology
Compared to graphite cathode of the current business application in lithium ion battery, lithium an- ode can provide more in theory
More capacity (3860mAh/g, graphite cathodes：370mAh/g), lithium an- ode be expected to portable electric appts of future generation with
And larger application is realized in the field such as electric automobile.Lithium-sulfur cell and lithium sky battery using lithium metal as negative pole are gradually studied
The concern of people, turn into academic and industrial circle research focus in recent years.But the research of lithium an- ode is also asked in the presence of many
Topic, most important of which one is the growth of dendrite.Dendrite is due in lithium-ion negative pole Multiple depositions/precipitation process, is born
The dendritic lithium deposit that pole occurs.Dendritic growth can bring the problem of two aspects：(1) dendrite, which can pierce through barrier film, causes electricity
Pond short circuit, short circuit current inside both positive and negative polarity cause battery system thermal runaway, and then trigger batteries caught fire in inside battery heat
A series of even safety problems such as blast；(2) dendrite can increase the side reaction of electrolyte and lithium metal, consume lithium active material,
Reduce battery utilization rate.The Li dendrite for departing from collector is dead lithium, and the appearance of dead lithium can reduce available active material, drop
The efficiency and cycle life of low battery.The thickness of traditional lithium battery cathode plate is 200 μm or so simultaneously, and thickness is larger.
The content of the invention
The invention solves traditional lithium battery cathode plate battery efficiency and cycle life are low, the big technology of negative plate thickness is asked
Topic, and a kind of lithium battery cathode plate and preparation method thereof is provided.
A kind of lithium battery cathode plate, including collector, intermediate material layer and metallic lithium layer, wherein, metallic lithium layer is attached to
On intermediate material layer, collector is under intermediate material layer；Intermediate material layer is according to mass fraction by 75~90 parts of active materials, 5
~20 parts of conductive agents and 5~10 parts of binding agents, active material are loose structure raw material of wood-charcoal material or adsorbable raw material of wood-charcoal material.
A kind of preparation method of lithium battery cathode plate, is specifically followed the steps below：
First, 75~90 parts of active materials, 5~20 parts of conductive agents and 5~10 parts of binding agents are mixed according to mass fraction, put
Enter in organic solvent, persistently stir 12~24h, form intermediate material layer slurry；
The 2nd, the intermediate material layer slurry that step 1 obtains is coated to the surface of collector using coating drying integral machine,
It is 50~150 μm to control coating thickness, and surface is dried under the conditions of being 80~120 DEG C in temperature, then it is 80~120 DEG C to control temperature
12~24h is dried in vacuo, then carries out roll-in, intermediate material is laminated to thickness as 30~100 μm, obtains coating intermediate material
The collector substrate of layer；
3rd, lithium ingot is subjected to roll-in, compacting obtains the lithium band that thickness is 1~30 μm；
4th, the lithium band that step 3 obtains is compressed on step 3 and obtains the intermediate material layer side of collector substrate, carried out
Roll-in, obtain a kind of lithium battery cathode plate.
The beneficial effects of the invention are as follows：The negative plate lithium metal content of the lithium battery of the present invention is more between active material
Adhesion is high, lithium metal is evenly distributed, and is realized by the method for physics roll-in.This method is safer, more time saving simple,
The adhesion of metallic lithium layer and intermediate material layer is very good simultaneously, realizes being uniformly distributed for lithium metal, can pass through lithium band
Thickness controls the content of lithium metal, further increases the effect of cathode of lithium battery.And lithium battery cathode plate of the present invention is thick
Spend thin, its thickness is within 150 μm, maintains the electric property of lithium battery cathode plate, circulates 100 weeks capacity attenuations
0.87%.
Lithium battery cathode plate prepared by the present invention is used for lithium battery energy storage battery field.
Brief description of the drawings
Fig. 1 is a kind of structural representation of lithium battery cathode plate described in embodiment one, wherein 1 represents collector, 2
It is metallic lithium layer for intermediate material layer, 3.
Embodiment
Technical solution of the present invention is not limited to the embodiment of act set forth below, in addition to each embodiment it
Between any combination.
Embodiment one：A kind of lithium battery cathode plate of present embodiment includes collector, intermediate material layer and metal
Lithium layer, wherein, metallic lithium layer is attached on intermediate material layer, and collector is under intermediate material layer；Intermediate material layer is according to quality
For number by 75~90 parts of active materials, 5~20 parts of conductive agents and 5~10 parts of binding agents, active material is loose structure raw material of wood-charcoal matter
Material or adsorbable raw material of wood-charcoal material.
Embodiment two：Present embodiment is unlike embodiment one：The thickness of metallic lithium layer is 1 μm
~30 μm, quality dense uniform.It is other identical with embodiment one.It is other identical with embodiment one.
Embodiment three：Present embodiment is unlike embodiment one or two：Raw material of wood-charcoal material is stone
One or more in ink, hard carbon, soft carbon and silicon-carbon press the mixing of any ratio.It is other identical with embodiment one or two.
Embodiment four：Unlike one of present embodiment and embodiment one to three：Intermediate material layer
Thickness is 30~100 μm, and compacted density is 1.3~1.8g/cm3.It is other identical with one of embodiment one to three.
Embodiment five：Unlike one of present embodiment and embodiment one to four：Conductive agent is to lead
The black super-p of electrical carbon, binding agent are polyvinylidene fluoride.It is other identical with one of embodiment one to four.
Embodiment six：Unlike one of present embodiment and embodiment one to five：Current collector material
For copper, thickness is 6~20 μm.It is other identical with one of embodiment one to five.
Embodiment seven：A kind of preparation method of lithium battery cathode plate described in embodiment one, is specifically pressed
Carried out according to following steps：
First, 75~90 parts of active materials, 5~20 parts of conductive agents and 5~10 parts of binding agents are mixed according to mass fraction, put
Enter in organic solvent, persistently stir 12~24h, form intermediate material layer slurry；
The 2nd, the intermediate material layer slurry that step 1 obtains is coated to the surface of collector using coating drying integral machine,
It is 50~150 μm to control coating thickness, and surface is dried under the conditions of being 80~120 DEG C in temperature, then it is 80~120 DEG C to control temperature
12~24h is dried in vacuo, then carries out roll-in, intermediate material is laminated to thickness as 30~100 μm, obtains coating intermediate material
The collector substrate of layer；
3rd, lithium ingot is subjected to roll-in, compacting obtains the lithium band that thickness is 1~30 μm；
4th, the lithium band that step 3 obtains is compressed on step 3 and obtains the intermediate material layer side of collector substrate, carried out
Roll-in, obtain a kind of lithium battery cathode plate.
Embodiment eight：Present embodiment is unlike embodiment seven：Active material is in step 1
Loose structure raw material of wood-charcoal material or adsorbable raw material of wood-charcoal material；Conductive agent is conductive carbon black super-p, and binding agent is to gather inclined difluoro
Ethene；Organic solvent is 1-METHYLPYRROLIDONE.It is other identical with embodiment seven.
Embodiment nine：Present embodiment is unlike embodiment seven or eight：Raw material of wood-charcoal material is stone
One or more in ink, hard carbon, soft carbon and silicon-carbon press the mixing of any ratio.It is other identical with embodiment seven or eight.
Embodiment ten：Unlike one of present embodiment and embodiment seven to nine：Collect in step 2
Fluent material is copper, and thickness is 6~20 μm.It is other identical with one of embodiment seven to nine.
Beneficial effects of the present invention are verified using following examples：
Embodiment one：
A kind of preparation method of lithium battery cathode plate of the present embodiment, is specifically followed the steps below：
First, 90 parts of graphite, 5 parts of conductive carbon black super-p and 5 parts of polyvinylidene fluoride are mixed according to mass fraction, put
Enter in organic solvent 1-METHYLPYRROLIDONE, persistently stir 12h, form intermediate material layer slurry；
The 2nd, the intermediate material layer slurry that step 1 obtains is coated to the surface of collector using coating drying integral machine,
It is 150 μm to control coating thickness, and surface is dried under the conditions of being 80 DEG C in temperature, then controls temperature as 120 DEG C of vacuum drying 12h,
Then roll-in is carried out, intermediate material is laminated to thickness as 90 μm, obtains coating the collector substrate of intermediate material layer；Wherein collect
Fluid is copper, and thickness is 8 μm；
3rd, lithium ingot is subjected to roll-in, compacting obtains the lithium band that thickness is 5 μm；
4th, the lithium band that step 3 obtains is compressed on step 3 and obtains the intermediate material layer side of collector substrate, carried out
Roll-in, obtain a kind of lithium battery cathode plate.
Embodiment two：
A kind of preparation method of lithium battery cathode plate of the present embodiment, is specifically followed the steps below：
First, 90 parts of graphite, 5 parts of conductive carbon black super-p and 5 parts of polyvinylidene fluoride are mixed according to mass fraction, put
Enter in organic solvent 1-METHYLPYRROLIDONE, persistently stir 12h, form intermediate material layer slurry；
The 2nd, the intermediate material layer slurry that step 1 obtains is coated to the surface of collector using coating drying integral machine,
It is 100 μm to control coating thickness, and surface is dried under the conditions of being 80 DEG C in temperature, then controls temperature as 120 DEG C of vacuum drying 12h,
Then roll-in is carried out, intermediate material is laminated to thickness as 60 μm, obtains coating the collector substrate of intermediate material layer；Wherein collect
Fluid is copper, and thickness is 8 μm；
3rd, lithium ingot is subjected to roll-in, compacting obtains the lithium band that thickness is 10 μm；
4th, the lithium band that step 3 obtains is compressed on step 3 and obtains the intermediate material layer side of collector substrate, carried out
Roll-in, obtain a kind of lithium battery cathode plate.
Embodiment three：
A kind of preparation method of lithium battery cathode plate of the present embodiment, is specifically followed the steps below：
First, 90 parts of graphite, 5 parts of conductive carbon black super-p and 5 parts of polyvinylidene fluoride are mixed according to mass fraction, put
Enter in organic solvent 1-METHYLPYRROLIDONE, persistently stir 12h, form intermediate material layer slurry；
The 2nd, the intermediate material layer slurry that step 1 obtains is coated to the surface of collector using coating drying integral machine,
It is 150 μm to control coating thickness, and surface is dried under the conditions of being 80 DEG C in temperature, then controls temperature as 120 DEG C of vacuum drying 12h,
Then roll-in is carried out, intermediate material is laminated to thickness as 40 μm, obtains coating the collector substrate of intermediate material layer；Wherein collect
Fluid is copper, and thickness is 8 μm；
3rd, lithium ingot is subjected to roll-in, compacting obtains the lithium band that thickness is 30 μm；
4th, the lithium band that step 3 obtains is compressed on step 3 and obtains the intermediate material layer side of collector substrate, carried out
Roll-in, obtain a kind of lithium battery cathode plate.
Lithium battery cathode plate prepared by above-described embodiment maintains the electric property of lithium battery cathode plate, circulates 100 weeks and holds
Amount decay is less than 0.87%.
Claims (10)
1. a kind of lithium battery cathode plate, it is characterised in that the lithium battery cathode plate includes collector, intermediate material layer and lithium metal
Layer, wherein, metallic lithium layer is attached on intermediate material layer, and collector is under intermediate material layer；Intermediate material layer is according to mass parts
For number by 75~90 parts of active materials, 5~20 parts of conductive agents and 5~10 parts of binding agents, active material is loose structure raw material of wood-charcoal material
Material or adsorbable raw material of wood-charcoal material.
2. a kind of lithium battery cathode plate according to claim 1, it is characterised in that the thickness of metallic lithium layer is 1 μm~30 μ
M, quality dense uniform.
3. a kind of lithium battery cathode plate according to claim 1, it is characterised in that raw material of wood-charcoal material is graphite, hard carbon, soft
One or more mixing in carbon and silicon-carbon.
4. a kind of lithium battery cathode plate according to claim 1, it is characterised in that intermediate material thickness degree is 30~100 μ
M, compacted density are 1.3~1.8g/cm3。
A kind of 5. lithium battery cathode plate according to claim 1, it is characterised in that conductive agent is conductive carbon black super-p,
Binding agent is polyvinylidene fluoride.
6. according to a kind of lithium battery cathode plate described in claim 1, it is characterised in that current collector material is copper, and thickness is 6~20 μ
m。
A kind of 7. preparation method of lithium battery cathode plate as claimed in claim 1, it is characterised in that this method specifically according to
Lower step is carried out：
First, 75~90 parts of active materials, 5~20 parts of conductive agents and 5~10 parts of binding agents are mixed according to mass fraction, have been put into
In solvent, 12~24h is persistently stirred, forms intermediate material layer slurry；
The 2nd, the intermediate material layer slurry that step 1 obtains is coated to the surface of collector, control using coating drying integral machine
Coating thickness is 50~150 μm, dries surface under the conditions of being 80~120 DEG C in temperature, then it is 80~120 DEG C of vacuum to control temperature
12~24h is dried, then carries out roll-in, intermediate material is laminated to thickness as 30~100 μm, obtains coating intermediate material layer
Collector substrate；
3rd, lithium ingot is subjected to roll-in, compacting obtains the lithium band that thickness is 1~30 μm；
4th, the lithium band that step 3 obtains is compressed on step 3 and obtains the intermediate material layer side of collector substrate, carry out roll-in,
Obtain a kind of lithium battery cathode plate.
A kind of 8. preparation method of lithium battery cathode plate according to right wants 7, it is characterised in that active material in step 1
For loose structure raw material of wood-charcoal material or adsorbable raw material of wood-charcoal material；Conductive agent is conductive carbon black super-p, and binding agent is poly- inclined two
PVF；Organic solvent is 1-METHYLPYRROLIDONE.
A kind of 9. preparation method of lithium battery cathode plate according to right wants 8, it is characterised in that raw material of wood-charcoal material be graphite,
One or more mixing in hard carbon, soft carbon and silicon-carbon.
A kind of 10. preparation method of lithium battery cathode plate according to right wants 7, it is characterised in that collector material in step 2
Expect that for copper, thickness be 6~20 μm.
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| CN201710607683.0A CN107403907A (en) | 2017-07-24 | 2017-07-24 | A kind of lithium battery cathode plate and preparation method thereof |
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| CN108807852A (en) * | 2018-08-30 | 2018-11-13 | 上海力信能源科技有限责任公司 | A kind of lithium ion battery silicon substrate cathode and preparation method thereof |
| CN111710874A (en) * | 2020-08-19 | 2020-09-25 | 广州纳诺新材料科技有限公司 | Solid-state lithium battery, composite negative electrode and preparation method of composite negative electrode |
| CN112825354A (en) * | 2019-11-20 | 2021-05-21 | 郑州宇通集团有限公司 | Lithium negative electrode, preparation method thereof and lithium secondary battery |
| CN119133357A (en) * | 2024-11-13 | 2024-12-13 | 横店集团东磁股份有限公司 | Lithium battery, lithium battery negative electrode sheet and preparation method thereof |
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| CN112825354B (en) * | 2019-11-20 | 2023-03-21 | 郑州宇通集团有限公司 | Lithium negative electrode, preparation method thereof and lithium secondary battery |
| CN111710874A (en) * | 2020-08-19 | 2020-09-25 | 广州纳诺新材料科技有限公司 | Solid-state lithium battery, composite negative electrode and preparation method of composite negative electrode |
| CN119133357A (en) * | 2024-11-13 | 2024-12-13 | 横店集团东磁股份有限公司 | Lithium battery, lithium battery negative electrode sheet and preparation method thereof |
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