CN115041071A - 一种改善负极堵筛网的匀浆工艺 - Google Patents
一种改善负极堵筛网的匀浆工艺 Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 20
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000001768 carboxy methyl cellulose Substances 0.000 claims abstract description 16
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 claims abstract description 16
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 claims abstract description 16
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 5
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 claims abstract description 5
- 239000006258 conductive agent Substances 0.000 claims abstract description 5
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 5
- 239000010439 graphite Substances 0.000 claims abstract description 5
- 238000003756 stirring Methods 0.000 claims abstract description 5
- 238000007580 dry-mixing Methods 0.000 claims abstract description 4
- 239000003292 glue Substances 0.000 claims abstract description 4
- 239000007787 solid Substances 0.000 claims abstract description 4
- 229920003048 styrene butadiene rubber Polymers 0.000 claims abstract description 4
- 230000000903 blocking effect Effects 0.000 claims description 5
- 239000002002 slurry Substances 0.000 abstract description 15
- 238000000576 coating method Methods 0.000 description 6
- 239000011248 coating agent Substances 0.000 description 5
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 3
- 229910001416 lithium ion Inorganic materials 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000000265 homogenisation Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000011267 electrode slurry Substances 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F33/00—Other mixers; Mixing plants; Combinations of mixers
- B01F33/80—Mixing plants; Combinations of mixers
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- 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
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- 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
- H01M4/1393—Processes of manufacture of electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
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- 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
- H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
- H01M2004/027—Negative electrodes
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Abstract
本发明公开了一种改善负极堵筛网的匀浆工艺,包括如下步骤,在1300L的双行星搅拌设备中,将石墨和导电剂进行干混30min,使用制胶罐制备固体含量1.6%的羧甲基纤维素钠溶液;加入步骤1中20%的羧甲基纤维素钠溶液并分散30min,低速30rpm,高速491rpm;加入步骤1中40%的羧甲基纤维素钠溶液并分散30min,低速30rpm,高速491rpm;加入丁苯橡胶和4kg的N‑甲基吡咯烷酮并分散60min,低速30rpm,高速800rpm;加入步骤1中剩余的羧甲基纤维素钠溶液并分散60min,低速30rpm,高速675rpm。本发明改善了浆料流动性、提高筛网使用寿命、提高面密度一致性,节省了成本。
Description
技术领域
本发明涉及锂离子电池技术领域,特别是一种改善负极堵筛网的匀浆工艺。
背景技术
匀浆工艺是锂离子电池生产制造的首道工艺,浆料的品质直接决定涂布工序能否顺利进行,对最终锂离子电池的质量影响超过了30%,然而负极浆料大多为湿法工艺,浆料最终流动性差。在负极匀浆工艺中,石墨和导电剂比表面积较大,沉降快,涂布易出现颗粒划痕,容易堵塞筛网,会造成浆料的浪费,成本的提升,也影响涂布面密度的一致性。
发明内容
本发明的目的在于克服现有技术的缺点,提供一种改善浆料流动性、提高筛网使用寿命、提高面密度一致性的改善负极堵筛网的匀浆工艺。
本发明的目的通过以下技术方案来实现,一种改善负极堵筛网的匀浆工艺,包括如下步骤,
1)在1300L的双行星搅拌设备中,将石墨和导电剂进行干混30min,使用制胶罐制备固体含量1.6%的羧甲基纤维素钠溶液;
2)加入步骤1中20%的羧甲基纤维素钠溶液并分散30min,低速30rpm,高速491rpm;
3)加入步骤1中40%的羧甲基纤维素钠溶液并分散30min,低速30rpm,高速491rpm;
4)加入丁苯橡胶和4kg的N-甲基吡咯烷酮并分散60min,低速30rpm,高速800rpm;
5)加入步骤1中剩余的羧甲基纤维素钠溶液并分散60min,低速30rpm,高速675rpm。
本发明具有以下优点:通过使用双行星搅拌设备将浆料分三次进行混合的匀浆工艺,将涂布125um的筛网使用寿命提升了7倍;同时将涂滤网压力降低至0.1Mpa以下,提升了面密度一致性;整体上提高了电池性能的一致性;显著降低了生产成本。
附图说明
图1是负极匀浆现工艺与实验工艺浆料粘度对比图;
图2是负极涂布滤网压力推移图;
图3是实验工艺(40%)与现工艺(50%)浆料涂布模头滤网压力趋势图。
具体实施方式
为使本发明实施方式的目的、技术方案和优点更加清楚,下面将结合具体实施方式中的技术方案进行清楚、完整地描述。
一种改善负极堵筛网的匀浆工艺,包括如下步骤,
1)在1300L的双行星搅拌设备中,将石墨和导电剂进行干混30min,使用制胶罐制备固体含量1.6%的羧甲基纤维素钠溶液;
2)加入步骤1中20%的羧甲基纤维素钠溶液并分散30min,低速30rpm,高速491rpm;
3)加入步骤1中40%的羧甲基纤维素钠溶液并分散30min,低速30rpm,高速491rpm;
4)加入丁苯橡胶(SBR)和4kg的N-甲基吡咯烷酮(NMP)并分散60min,低速30rpm,高速800rpm;
5)加入步骤1中剩余的羧甲基纤维素钠溶液并分散60min,低速30rpm,高速675rpm。
将改善后的实验工艺与现有工艺的浆料进行粘度、涂布滤网压力、涂布滤网寿命进行对比,结果如下:
如图1所示,实验工艺浆料比现有工艺浆料粘度降低600mpa.s,提升了浆料的流动性;
如图2所示,实验工艺浆料比现有工艺浆料涂布滤网压力降低了0.04mPa;
如图3所示,实验工艺浆料比现有工艺浆料涂布滤网寿命提升了7倍。
Claims (1)
1.一种改善负极堵筛网的匀浆工艺,其特征在于,包括如下步骤,
1)在1300L的双行星搅拌设备中,将石墨和导电剂进行干混30min,使用制胶罐制备固体含量1.6%的羧甲基纤维素钠溶液;
2)加入步骤1中20%的羧甲基纤维素钠溶液并分散30min,低速30rpm,高速491rpm;
3)加入步骤1中40%的羧甲基纤维素钠溶液并分散30min,低速30rpm,高速491rpm;
4)加入丁苯橡胶和4kg的N-甲基吡咯烷酮并分散60min,低速30rpm,高速800rpm;
5)加入步骤1中剩余的羧甲基纤维素钠溶液并分散60min,低速30rpm,高速675rpm。
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WO2017032154A1 (zh) * | 2015-08-25 | 2017-03-02 | 田东 | 一种锂电池石墨负极浆料的制备方法 |
CN106981620A (zh) * | 2017-04-07 | 2017-07-25 | 惠州拓邦电气技术有限公司 | 一种锂离子电池负极浆料的制备方法 |
US20190067685A1 (en) * | 2017-08-31 | 2019-02-28 | Contemporary Amperex Technology Co., Limited | Negative electrode slurry, negative electrode plate and electrochemical energy storage device |
CN109802097A (zh) * | 2019-01-30 | 2019-05-24 | 郑州比克电池有限公司 | 一种高容量圆柱18650锂离子电池负极匀浆搅拌工艺 |
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CN113948668A (zh) * | 2020-07-16 | 2022-01-18 | 深圳格林德能源集团有限公司 | 一种锂离子电池负极浆料制备方法 |
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Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
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CN104766949A (zh) * | 2014-01-08 | 2015-07-08 | 中山天贸电池有限公司 | 一种锂离子电池负极浆料的加工方法 |
WO2017032154A1 (zh) * | 2015-08-25 | 2017-03-02 | 田东 | 一种锂电池石墨负极浆料的制备方法 |
CN106981620A (zh) * | 2017-04-07 | 2017-07-25 | 惠州拓邦电气技术有限公司 | 一种锂离子电池负极浆料的制备方法 |
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