CN107819105A - Manufacturing method of silicon-carbon negative pole piece - Google Patents
Manufacturing method of silicon-carbon negative pole piece Download PDFInfo
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- CN107819105A CN107819105A CN201710966125.3A CN201710966125A CN107819105A CN 107819105 A CN107819105 A CN 107819105A CN 201710966125 A CN201710966125 A CN 201710966125A CN 107819105 A CN107819105 A CN 107819105A
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- silicon
- carbon cathode
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- copper foil
- pole piece
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- HMDDXIMCDZRSNE-UHFFFAOYSA-N [C].[Si] Chemical compound [C].[Si] HMDDXIMCDZRSNE-UHFFFAOYSA-N 0.000 title claims abstract description 70
- 238000004519 manufacturing process Methods 0.000 title abstract description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 36
- 239000011889 copper foil Substances 0.000 claims abstract description 35
- 238000000576 coating method Methods 0.000 claims abstract description 29
- 239000011248 coating agent Substances 0.000 claims abstract description 22
- 238000001035 drying Methods 0.000 claims abstract description 15
- 238000007603 infrared drying Methods 0.000 claims abstract description 14
- 238000002360 preparation method Methods 0.000 claims abstract description 14
- 239000006257 cathode slurry Substances 0.000 claims description 29
- 229910052710 silicon Inorganic materials 0.000 claims description 7
- 239000010703 silicon Substances 0.000 claims description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- 239000006256 anode slurry Substances 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 5
- 239000011267 electrode slurry Substances 0.000 abstract 5
- 238000005056 compaction Methods 0.000 abstract 1
- 239000000463 material Substances 0.000 description 8
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 6
- 229910002804 graphite Inorganic materials 0.000 description 5
- 239000010439 graphite Substances 0.000 description 5
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 4
- 229910001416 lithium ion Inorganic materials 0.000 description 4
- 239000010405 anode material Substances 0.000 description 3
- 238000004804 winding Methods 0.000 description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- 239000010406 cathode material Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000009831 deintercalation Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000002305 electric material Substances 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000005213 imbibition Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 238000007581 slurry coating method Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000006467 substitution reaction 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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/64—Carriers or collectors
- H01M4/66—Selection of materials
- H01M4/661—Metal or alloys, e.g. alloy coatings
-
- 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
- H01M4/04—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
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/133—Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
-
- 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
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- 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)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The invention discloses a method for manufacturing a silicon-carbon negative pole piece, which comprises the following steps: uniformly coating the silicon-carbon negative electrode slurry on two surfaces of a copper foil current collector to obtain a silicon-carbon negative electrode plate, wherein the copper foil current collector is provided with uniformly distributed micropores, one surface of the copper foil current collector is an A surface, and the other surface of the copper foil current collector is a B surface; the coating process comprises the following steps: coating silicon-carbon negative electrode slurry with the weight not more than 1/4 surface density on the surface A, performing infrared drying, coating the rest silicon-carbon negative electrode slurry on the surface A, performing drying, coating the surface B, and performing drying to obtain a silicon-carbon negative electrode piece; or coating silicon-carbon negative electrode slurry with the weight not more than 1/4 surface density on the surface A, performing infrared drying, coating the surface B, performing drying, coating the rest silicon-carbon negative electrode slurry on the surface A, and drying to obtain the silicon-carbon negative electrode plate. The preparation method is simple to operate, and the prepared silicon-carbon negative pole piece has high coating amount and compaction density.
Description
Technical field
The present invention relates to technical field of lithium ion, more particularly to a kind of preparation method of silicon-carbon cathode pole piece.
Background technology
With the promulgation of newest public subsidies policy in 2016, the lifting of lithium ion battery energy density turns into each at this stage
One of the problem of individual lithium ion battery manufacturer pays close attention to the most.At present, either in NCM systems or LFP systems, using into
Ripe negative material is graphite.The theoretical gram volume of graphite cathode is 372mAh/g, passes through material manufacture system and materials'use
The joint efforts of both systems, gram volume of the graphite cathode in full battery, which plays, at present has reached 355mAh/g, reaches reason
By more than the 95% of value, the application of graphite cathode is already close to the limit.Silicon based anode material is due to abundant reserves and superelevation
Theoretical specific capacity, which is increasingly becoming battery enterprise and lithium electric material, improves the optimal selection of negative pole, is most potential lithium of future generation
One of ion battery cathode material.
But silica-base material in actual use there is also it is more obvious the shortcomings that, be mainly manifested in：1) in battery
Charge and discharge process in can cause the serious expansion of silicon volume, huge bulk effect and relatively low electric conductivity have had a strong impact on silicon
The cycle life of full battery made of base negative material, at the same it is serious constrain coated in negative material process parameter surface density and
Compacted density；2) silicon is as semiconductor, and electric conductivity is more far short of what is expected than graphite cathode, the irreversible degree during lithium ion deintercalation
Greatly, so the coulombic efficiency first of silicon based anode material is very low, the performance of battery normal capacity can be influenceed.
Therefore, lifting battery energy density have to increase unit area collector on silicon based anode material coated weight and
Compacted density.
The content of the invention
Based on technical problem existing for background technology, the present invention proposes a kind of preparation method of silicon-carbon cathode pole piece, this
Invent simple to operate, the silicon-carbon cathode pole piece being prepared has higher coated weight and compacted density.
A kind of preparation method of silicon-carbon cathode pole piece proposed by the present invention, comprises the following steps：Silicon-carbon cathode slurry is equal
The even two sides coated in copper foil current collector obtains silicon-carbon cathode pole piece, wherein, equally distributed micropore is carried in copper foil current collector,
The one side of copper foil current collector is A faces, and another side is B faces；
Coating processes are：The first silicon-carbon cathode slurry for being no more than 1/4 surface density in A faces coat weight, infrared drying, then
A faces coat remaining silicon-carbon cathode slurry, and drying is then coated with B faces, and drying obtains silicon-carbon cathode pole piece；Or first coated in A faces
Weight is no more than the silicon-carbon cathode slurry of 1/4 surface density, infrared drying, is then coated with B faces, dries, then remaining in the coating of A faces
Silicon-carbon cathode slurry, drying obtain silicon-carbon cathode pole piece.
Preferably, the tensile strength of copper foil current collector is more than 300Mpa.
Preferably, the porosity of copper foil current collector is 14-20%, and micropore size is 70-120 mesh.
Preferably, when A faces coat weight is no more than the silicon-carbon cathode slurry of 1/4 surface density, the speed of coating machine is
The spacing of more than 80m/min, coater head and baking oven is within 1m, and infrared drying equipment is set in the baking oven of coating machine.
Preferably, the viscosity of silicon-carbon cathode slurry is 5000-10000mPa.s.
Above-mentioned surface density need to coat the weight of cathode size for the collector one side of unit area, be statement commonly used in the art
Method.
The present invention is simple to operate, from the copper foil with micropore as collector, can improve silicon-carbon under the conditions of high-pressure solid
Combination between cathode size and rigid current collector, alleviate during circulating battery the imbibition expansion of silicon-carbon cathode slurry and to de-
Fall；Divide three steps to carry out silicon-carbon cathode slurry coating to collector, and cooperated with micropore copper foil so that the silicon-carbon being prepared
Cathode pole piece has higher coated weight and compacted density, so as to improve the energy density of battery.
Embodiment
Below, technical scheme is described in detail by specific embodiment.
Embodiment 1
A kind of preparation method of silicon-carbon cathode pole piece, comprises the following steps：It is 5000mPa.s silicon-carbon cathode slurries by viscosity
The two sides for being coated uniformly on copper foil current collector obtains silicon-carbon cathode pole piece, wherein, with equally distributed micro- in copper foil current collector
Hole, the tensile strength of copper foil current collector are 400Mpa, and the porosity of copper foil current collector is 20%, and micropore size is 70 mesh, copper foil
The one side of collector is A faces, and another side is B faces；
Coating processes are：The first silicon-carbon cathode slurry in A faces coat weight for 1/5 surface density, infrared drying, then in A faces
Remaining silicon-carbon cathode slurry is coated, is dried, is then coated with B faces, drying obtains silicon-carbon cathode pole piece, wherein, coat weight in A faces
When measuring the silicon-carbon cathode slurry for 1/5 surface density, the speed of coating machine is 100m/min, and the spacing of coater head and baking oven is
0.8m, the baking oven of coating machine is interior to set infrared drying equipment.
Embodiment 2
A kind of preparation method of silicon-carbon cathode pole piece, comprises the following steps：Viscosity is starched for 10000mPa.s silicon-carbon cathodes
The two sides that material is coated uniformly on copper foil current collector obtains silicon-carbon cathode pole piece, wherein, with equally distributed in copper foil current collector
Micropore, the tensile strength of copper foil current collector are 500Mpa, and the porosity of copper foil current collector is 14%, and micropore size is 120 mesh, copper
The one side of paper tinsel collector is A faces, and another side is B faces；
Coating processes are：First in the silicon-carbon cathode slurry that A faces coat weight is 1/6 surface density, infrared drying, it is then coated with
B faces, drying, then remaining silicon-carbon cathode slurry is coated in A faces, drying obtains silicon-carbon cathode pole piece, wherein, coat weight in A faces
When measuring the silicon-carbon cathode slurry for 1/6 surface density, the speed of coating machine is 90m/min, and the spacing of coater head and baking oven is
0.9m, the baking oven of coating machine is interior to set infrared drying equipment.
Embodiment 3
A kind of preparation method of silicon-carbon cathode pole piece, comprises the following steps：It is 7500mPa.s silicon-carbon cathode slurries by viscosity
The two sides for being coated uniformly on copper foil current collector obtains silicon-carbon cathode pole piece, wherein, with equally distributed micro- in copper foil current collector
Hole, the tensile strength of copper foil current collector are 300Mpa, and the porosity of copper foil current collector is 15%, and micropore size is 100 mesh, copper foil
The one side of collector is A faces, and another side is B faces；
Coating processes are：The first silicon-carbon cathode slurry with split type coating machine in A faces coat weight for 1/4 surface density, it is red
Outer flash baking, winding is stand-by, then coats B faces, drying with Conventional coaters, then remaining silicon-carbon cathode slurry is coated in A faces
Material, drying, winding obtain silicon-carbon cathode pole piece, wherein, when in A faces, coat weight is the silicon-carbon cathode slurry of 1/4 surface density, apply
The speed of cloth machine is 80m/min, and the spacing of coater head and baking oven is 1m, and infrared drying equipment is set in the baking oven of coating machine.
Embodiment 4
A kind of preparation method of silicon-carbon cathode pole piece, comprises the following steps：It is 7500mPa.s silicon-carbon cathode slurries by viscosity
The two sides for being coated uniformly on copper foil current collector obtains silicon-carbon cathode pole piece, wherein, with equally distributed micro- in copper foil current collector
Hole, the tensile strength of copper foil current collector are 300Mpa, and the porosity of copper foil current collector is 15%, and micropore size is 100 mesh, copper foil
The one side of collector is A faces, and another side is B faces；
Coating processes are：The first silicon-carbon cathode slurry with Contiuum type coating machine in A faces coat weight for 1/4 surface density, it is red
Outer flash baking, coated machine are crossed roller and drawn to Conventional coaters, then coat remaining silicon-carbon in A faces with Conventional coaters and bear
Pole slurry, drying, is then coated with B faces, dries, and winding obtains silicon-carbon cathode pole piece, wherein, in A faces, coat weight is that 1/4 face is close
During the silicon-carbon cathode slurry of degree, the speed of coating machine is 80m/min, and the spacing of coater head and baking oven is 1m, the baking of coating machine
Infrared drying equipment is set in case.
The foregoing is only a preferred embodiment of the present invention, but protection scope of the present invention be not limited thereto,
Any one skilled in the art the invention discloses technical scope in, technique according to the invention scheme and its
Inventive concept is subject to equivalent substitution or change, should all be included within the scope of the present invention.
Claims (5)
1. a kind of preparation method of silicon-carbon cathode pole piece, it is characterised in that comprise the following steps：Silicon-carbon cathode slurry is uniformly applied
The two sides for overlaying on copper foil current collector obtains silicon-carbon cathode pole piece, wherein, equally distributed micropore, copper foil are carried in copper foil current collector
The one side of collector is A faces, and another side is B faces；
Coating processes are：The first silicon-carbon cathode slurry for being no more than 1/4 surface density in A faces coat weight, infrared drying, then in A faces
Remaining silicon-carbon cathode slurry is coated, is dried, is then coated with B faces, drying obtains silicon-carbon cathode pole piece；Or first coat weight in A faces
Amount infrared drying, is then coated with B faces, dried, then coat remaining silicon in A faces no more than the silicon-carbon cathode slurry of 1/4 surface density
Carbon anode slurry, drying obtain silicon-carbon cathode pole piece.
2. the preparation method of silicon-carbon cathode pole piece according to claim 1, it is characterised in that the tensile strength of copper foil current collector
For more than 300Mpa.
3. the preparation method of silicon-carbon cathode pole piece according to claim 1 or claim 2, it is characterised in that the hole of copper foil current collector
Rate is 14-20%, and micropore size is 70-120 mesh.
4. according to the preparation method of any one of the claim 1-3 silicon-carbon cathode pole pieces, it is characterised in that coat weight in A faces
Amount no more than 1/4 surface density silicon-carbon cathode slurry when, the speed of coating machine is more than 80m/min, coater head and baking oven
Spacing is within 1m, and infrared drying equipment is set in the baking oven of coating machine.
5. according to the preparation method of any one of the claim 1-4 silicon-carbon cathode pole pieces, it is characterised in that silicon-carbon cathode slurry
Viscosity be 5000-10000mPa.s.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710966125.3A CN107819105A (en) | 2017-10-17 | 2017-10-17 | Manufacturing method of silicon-carbon negative pole piece |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710966125.3A CN107819105A (en) | 2017-10-17 | 2017-10-17 | Manufacturing method of silicon-carbon negative pole piece |
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| CN107819105A true CN107819105A (en) | 2018-03-20 |
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| CN201710966125.3A Pending CN107819105A (en) | 2017-10-17 | 2017-10-17 | Manufacturing method of silicon-carbon negative pole piece |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109065833A (en) * | 2018-06-28 | 2018-12-21 | 合肥国轩高科动力能源有限公司 | Surface treatment method for porous current collector of silicon-carbon composite negative plate of lithium battery |
| CN109273680A (en) * | 2018-08-29 | 2019-01-25 | 四川西丹孚能源科技有限公司 | A kind of porous silicon-carbon cathode material and preparation method thereof and lithium ion battery |
| CN109494374A (en) * | 2018-11-12 | 2019-03-19 | 桑顿新能源科技有限公司 | Lithium ion battery silicon-carbon cathode piece and preparation method thereof |
| CN111864185A (en) * | 2020-07-15 | 2020-10-30 | 河南平煤国能锂电有限公司 | Method for manufacturing anode of lithium ion battery |
| CN111916670A (en) * | 2020-09-23 | 2020-11-10 | 珠海冠宇电池股份有限公司 | Negative plate and application thereof |
| CN113675456A (en) * | 2021-08-20 | 2021-11-19 | 夏秀明 | Power type lithium ion battery monomer, power battery pack and electric vehicle |
| CN115842085A (en) * | 2022-08-17 | 2023-03-24 | 宁德时代新能源科技股份有限公司 | Manufacturing method and manufacturing system of electrode pole piece and battery monomer |
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Cited By (10)
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| CN109065833A (en) * | 2018-06-28 | 2018-12-21 | 合肥国轩高科动力能源有限公司 | Surface treatment method for porous current collector of silicon-carbon composite negative plate of lithium battery |
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| CN109273680A (en) * | 2018-08-29 | 2019-01-25 | 四川西丹孚能源科技有限公司 | A kind of porous silicon-carbon cathode material and preparation method thereof and lithium ion battery |
| CN109273680B (en) * | 2018-08-29 | 2020-10-20 | 四川西丹孚能源科技有限公司 | Porous silicon-carbon negative electrode material, preparation method thereof and lithium ion battery |
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| CN111864185A (en) * | 2020-07-15 | 2020-10-30 | 河南平煤国能锂电有限公司 | Method for manufacturing anode of lithium ion battery |
| CN111916670A (en) * | 2020-09-23 | 2020-11-10 | 珠海冠宇电池股份有限公司 | Negative plate and application thereof |
| CN113675456A (en) * | 2021-08-20 | 2021-11-19 | 夏秀明 | Power type lithium ion battery monomer, power battery pack and electric vehicle |
| CN115842085A (en) * | 2022-08-17 | 2023-03-24 | 宁德时代新能源科技股份有限公司 | Manufacturing method and manufacturing system of electrode pole piece and battery monomer |
| WO2024037191A1 (en) * | 2022-08-17 | 2024-02-22 | 宁德时代新能源科技股份有限公司 | Manufacturing method and manufacturing system for electrode sheet, and battery cell |
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