CN106410206A - 一种改善锂离子电池电极导电性的涂层 - Google Patents
一种改善锂离子电池电极导电性的涂层 Download PDFInfo
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title abstract description 6
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 8
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 8
- 239000011889 copper foil Substances 0.000 claims description 8
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 6
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- 239000008367 deionised water Substances 0.000 claims description 2
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- 229910002804 graphite Inorganic materials 0.000 claims description 2
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- 239000003273 ketjen black Substances 0.000 claims description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 2
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- LLYXJBROWQDVMI-UHFFFAOYSA-N 2-chloro-4-nitrotoluene Chemical compound CC1=CC=C([N+]([O-])=O)C=C1Cl LLYXJBROWQDVMI-UHFFFAOYSA-N 0.000 claims 1
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- 229910052744 lithium Inorganic materials 0.000 description 3
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- 239000005955 Ferric phosphate Substances 0.000 description 1
- 239000002033 PVDF binder Substances 0.000 description 1
- 239000005030 aluminium foil Substances 0.000 description 1
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- 229910021393 carbon nanotube Inorganic materials 0.000 description 1
- 239000002041 carbon nanotube Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- QHGJSLXSVXVKHZ-UHFFFAOYSA-N dilithium;dioxido(dioxo)manganese Chemical compound [Li+].[Li+].[O-][Mn]([O-])(=O)=O QHGJSLXSVXVKHZ-UHFFFAOYSA-N 0.000 description 1
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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
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/624—Electric conductive fillers
- H01M4/625—Carbon or graphite
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- H01M10/00—Secondary cells; Manufacture thereof
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Abstract
本发明公开了一种改善锂离子电池电极导电性的涂层，由浆料搅拌均匀后分别涂覆在箔材的两面经烘干制备而成，浆料组成为：导电剂1～10Wt％，粘结剂0.5～9Wt％，溶剂80～97.5Wt％；采用聚四氟乙烯、丙烯酸类水溶剂、聚乙腈类水溶剂中任一种作为粘结剂。本发明用于制作动力电池，能够降低电池内阻，提高电池容量，改善电池极片导电性能和导热性能，从而提高电池综合性能。
Description
技术领域
本发明涉及电池的领域，特别涉及一种改善锂离子电池电极导电性的涂层。
背景技术
随着传统化石能源的短缺，人们对环境问题日益重视。锂离子电池作为新能源受到人们普遍的重视，除了现有的生活中便携式的电池应用，其在大功率、高能量的动力电池中的发展越来越重要。
动力锂离子电池在使用过程中需要大电流、大功率充放电，因此对电池的电化学性能、安全性能和热性能提出更高的要求，市场现有比较成熟的动力锂离子电池包括磷酸铁锂电池、锰酸锂电池、钛酸锂电池，这几种电池的电极极片普遍存在导电性较差，进而影响了锂离子动力电池的大电流和大功率充放电。
发明内容
为解决现有锂离子电池中存在的导电性能差的问题，本发明提供一种能改善电池导电性的涂层。
本发明的技术方案是：
一种改善锂离子电池电极导电性的涂层，由浆料搅拌均匀后分别涂覆在箔材的两面经烘干制备而成，浆料组成为：导电剂1～10Wt％，粘结剂0.5～9Wt％，溶剂80～92Wt％，且上述原料的总和为100％；粘结剂为聚四氟乙烯、丙烯酸类水溶剂、聚乙腈类水溶剂中任一种。
进一步地，导电剂为导电石墨、导电炭黑、超级导电碳、科琴黑、碳纳米管、碳纤维、石墨烯其中任意的一种或两种。
优选地，溶剂为甲基吡咯烷酮、聚乙烯醇、去离子水中任意的一种。
优选地，涂层的单面厚度为0.1～15um。
优选地，箔材为双面光铜箔、单面光铜箔或压延铝箔。
优选地，双面光铜箔的厚度为6～15um。
优选地，单面光铜箔的厚度为6～15μm。
优选地，压延铝箔的厚度为12～25μm。
本发明的有益效果是：本发明用于动力电池的制作，能够降低电池内阻，提高电池容量，改善电池极片导电性能和导热性能，从而提高电池综合性能。
具体实施方式
下面通过实施例对本发明做进一步的阐述：
实施例1
一种改善锂离子电池电极导电性的涂层，将浆料搅拌均匀后分别涂覆在15μm的厚压延铝箔的两面上制备而成；浆料组成为：超级导电碳1％；丙烯酸1.5％；聚乙烯醇97.5％，涂层的单面厚度为1μm；
实施例2
采用与实施例1相同的浆料制备涂层，不同在于，涂层单面厚度为3μm；
实施例3
一种改善锂离子电池电极导电性的涂层，将浆料搅拌均匀后分别涂覆在15μm的厚压延铝箔的两面上制备而成；浆料组成为：碳纳米管(CNT)1％；聚四氟乙烯(PVDF)2％；甲基吡咯烷酮(NMP)97.0％，涂层单面厚度为1um；
实施例4
采用与实施例3相同的浆料制备涂层，不同在于所述涂层的单面厚度为3um。
分别将未涂覆的铝箔、实施例1至4制备的涂层作为电极用于钛酸锂电池制备，并对各电池的内阻、容量、5C电池电压平台等电池性能做比较。
电池内阻测试结果如下：
上述结果表明，采用涂层电极制备的电池的内阻明显低于普通电极的电池内阻，因此增加涂层可以不同程度的降低电池内阻。
电池5C电压平台结果如下：
上述结果表明，采用涂层电极制备的电池的5C电压平台高于普通电极的电池内阻，因此增加涂层可以不同程度的提升电压平台。
电池容量测试结果如下：
| 普通电极 | 实施例1 | 实施例2 | 实施例3 | 实施例4 | |
| 容量(mAh) | 4700 | 5006 | 5782 | 5188 | 6084.4 |
上述结果表明，采用涂层电极制备的电池容量明显高于普通电极的电池容量，因此增加涂层可以不同程度的增加电池容量。
以上的实施例只是在于说明而不是限制本发明，故凡依本发明专利申请范围所述的方法所做的等效变化或修饰，均包括于本发明专利申请范围内。
Claims (8)
1.一种改善锂离子电池电极导电性的涂层，其特征在于，所述涂层由浆料搅拌均匀后分别涂覆在箔材的两面经烘干制备而成，所述浆料组成为：导电剂1～10Wt％，粘结剂0.5～9Wt％，溶剂80～97.5Wt％；所述粘结剂为聚四氟乙烯、丙烯酸类水溶剂、聚乙腈类水溶剂中任一种。
2.根据权利要求1所述的改善锂离子电池电极导电性的涂层，其特征在于所述导电剂为导电石墨、导电炭黑、超级导电碳、科琴黑、碳纳米管、碳纤维、石墨烯其中任一种或两种。
3.根据权利要求1所述的改善锂离子电池电极导电性的涂层，其特征在于所述溶剂为甲基吡咯烷酮、聚乙烯醇、去离子水中任一种。
4.根据权利要求1所述的改善锂离子电池电极导电性的涂层，其特征在于所述涂层的厚度为0.1～15um。
5.根据权利要求1所述的改善锂离子电池电极导电性的涂层，其特征在于所述箔材为双面光铜箔、单面光铜箔或压延铝箔。
6.根据权利要求5所述的改善锂离子电池电极导电性的涂层，其特征在于所述双面光铜箔的厚度为6～15um。
7.根据权利要求5所述的改善锂离子电池电极导电性的涂层，其特征在于所述单面光铜箔的厚度为6～15μm。
8.根据权利要求5所述的改善锂离子电池电极导电性的涂层，其特征在于所述压延铝箔的厚度为12～25μm。
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112820880A (zh) * | 2020-12-31 | 2021-05-18 | 佛山市中技烯米新材料有限公司 | 一种电池集流体及其制备方法 |
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| CN101174685A (zh) * | 2007-10-26 | 2008-05-07 | 中南大学 | 一种锂离子电池正极或负极极片及其涂布方法 |
| US20090202806A1 (en) * | 2008-02-11 | 2009-08-13 | Takeo Ebina | Film made from denatured clay |
| CN102420315A (zh) * | 2011-11-30 | 2012-04-18 | 南京双登科技发展研究院有限公司 | 钛酸锂电池负极制作方法 |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1373527A (zh) * | 2001-02-28 | 2002-10-09 | 三洋电机株式会社 | 碱性蓄电池用电极的制造方法 |
| CN101174685A (zh) * | 2007-10-26 | 2008-05-07 | 中南大学 | 一种锂离子电池正极或负极极片及其涂布方法 |
| US20090202806A1 (en) * | 2008-02-11 | 2009-08-13 | Takeo Ebina | Film made from denatured clay |
| CN102420315A (zh) * | 2011-11-30 | 2012-04-18 | 南京双登科技发展研究院有限公司 | 钛酸锂电池负极制作方法 |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112820880A (zh) * | 2020-12-31 | 2021-05-18 | 佛山市中技烯米新材料有限公司 | 一种电池集流体及其制备方法 |
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