CN115074059A - 一种高粘接性水系p(vdf-hfp)涂胶隔膜的制备方法及锂离子电池 - Google Patents

一种高粘接性水系p(vdf-hfp)涂胶隔膜的制备方法及锂离子电池 Download PDF

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CN115074059A
CN115074059A CN202210795092.1A CN202210795092A CN115074059A CN 115074059 A CN115074059 A CN 115074059A CN 202210795092 A CN202210795092 A CN 202210795092A CN 115074059 A CN115074059 A CN 115074059A
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hfp
slurry
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谢玉虎
李凯
陈萌
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Hefei Gotion High Tech Power Energy Co Ltd
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Abstract

本发明提供了一种高粘接性水系P(VDF‑HFP)涂胶隔膜及其制备方法和锂离子电池。通过普通P(VDF‑HFP)粉体与带极性基团单体共聚，制备一种改性P(VDF‑HFP)粉体，采用该粉体制备的水系浆料，涂覆于基膜表面，制备高粘接性水系P(VDF‑HFP)涂胶隔膜，提高了隔膜与负极极片间的热压粘附效果。

Description

一种高粘接性水系P(VDF-HFP)涂胶隔膜的制备方法及锂离子 电池
技术领域
本发明属于锂离子电池隔膜领域，具体涉及一种高粘接性水系P(VDF-HFP)涂胶隔膜及其制备方法。
背景技术
当前，基于热复合叠片工艺对隔膜与极片间粘附性能要求较高，普通水系P(VDF-HFP)涂胶隔膜难以满足工艺要求。根据现有实验结果及粘附力产生机理分析，隔膜与负极极片间难以产生稳定的粘附力是导致该问题的主要原因。
通过接枝反应，在普通P(VDF-HFP)粉体颗粒表面引入带极性官能团单体，可以通过氢键作用，提升隔膜与负极极片间的粘附作用。马来酸酐是一类常用的接枝共聚单体，常用于非极性聚合物的改性，提升与极性聚合物间的相容性。
发明内容
基于此，本发明提供了一种高粘接性水系P(VDF-HFP)浆料的制备方法，成功的解决了普通水系涂胶隔膜与极片间的热复合粘结效果不佳的问题。
为了实现上述目的，本发明采用以下技术方案：
一种高粘接性水系P(VDF-HFP)浆料的制备方法，其特征在于，具体包括以下步骤：
S1、将表面活性剂加入去离子水中搅拌溶解，随后加入普通市售P(VDF-HFP)粉体，搅拌分散均匀；
S2、向S1所述分散液中加入马来酸酐和过硫酸铵后加热进行反应；
S3、待反应结束后冷却至室温，再加入粘结剂，分散均匀后得到所述高粘接性水系P(VDF-HFP)浆料。
优选地，S1中，所述表面活性剂为脂肪醇聚氧乙烯醚、聚氧乙烯烷基酰胺、聚醚有机硅中的一种；
优选地，在S1中，所述P(VDF-HFP)粉体和表面活性剂的重量比为100:0.5-100:10；
优选地，在S2中，所述P(VDF-HFP)粉体：马来酸酐：过硫酸铵的之间的重量比为100:3-20:0.05-0.3；
优选地，在S2中，所述加热温度为70-100℃，所述加热时间为50-120分钟；
优选地，在S3中，所述粘结剂为丙烯酸酯共聚物；所述P(VDF-HFP)粉体和粘结剂的重量比为100:5-100:20；
优选地，所述高粘接性水系P(VDF-HFP)浆料的固含量为5-20％。
本发明还提出了一种采用上述制备方法得到的高粘接性水系P(VDF-HFP)浆料。
本发明还提出一种高粘接性水系P(VDF-HFP)涂胶隔膜，括基膜，所述基膜为聚烯烃隔膜或涂覆有陶瓷层的陶瓷隔膜，其特征在于，所述基膜至少一面涂覆上述的P(VDF-HFP)浆料
本发明还提出了一种锂离子电池，隔膜采用上述的高粘接性水系P(VDF-HFP)涂胶隔膜。
有益效果：本发明以马来酸酐接枝改性引入极性基团，改善极性聚合物之间的相容性，对P(VDF-HFP)表面进行接枝改性，通过氢键作用，能够提高隔膜与负极极片的粘附作用。
具体实施方式
为了便于理解本发明，下面将结合具体的实施例对本发明进行更全面的描述。但是，本发明可以以许多不同的形式来实现，并不限于本文所描述的实施方式。相反地，提供这些实施方式的目的是使对本发明的公开内容理解的更加透彻全面。
除非另有定义，本文所使用的所有的技术和科学术语与属于本发明的技术领域的技术人员通常理解的含义相同。本文中在本发明的说明书中所使用的术语只是为了描述具体的实施方式的目的，不是旨在于限制本发明。
实施例1
本发明提出的一种高粘接性水系P(VDF-HFP)浆料的制备方法，包括以下步骤：
S1：将6.5g聚醚改性有机硅表面活性剂加入5kg去离子水中搅拌溶解，再加入0.5kg普通P(VDF-HFP)粉体，搅拌分散均匀；
S2：向S1所述分散液中加入0.5kg马来酸酐和25g过硫酸铵，升温至85℃，并保温80分钟；
S3：待S2所述分散液冷却至室温，再加入0.25kg丙烯酸酯共聚物粘结剂，搅拌分散均匀；
将上述浆料涂覆于9微米PE基膜两面，控制每面涂覆量0.5g±0.1g。
对比例1采用普通P(VDF-HFP)粉体制作涂覆浆料，并涂覆于9微米PE基膜两面，控制每面涂覆量0.5g±0.1g。
表1隔膜与极片间粘附强度
正极极片(N/m) 负极极片(N/m)
实施例1 5.6 2.4
对比例1 5.7 0.8
由表1可以看出，实施例1中提供的改性隔膜有助于提升隔膜与负极极片间的粘附效果。
以上实施例仅用以说明本发明的技术方案，而非对其限制；尽管参照前述实施例对本发明进行了详细的说明，本领域的普通技术人员应当理解：其依然能够对前述各实施例所记载的技术方案进行修改，或者对其中部分技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本发明各实施例技术方案的精神和范围。

Claims (9)

1.一种高粘接性水系P(VDF-HFP)浆料的制备方法，其特征在于，具体包括以下步骤：
S1、将表面活性剂加入去离子水中搅拌溶解，随后加入普通市售P(VDF-HFP)粉体，搅拌分散均匀；
S2、向S1所述分散剂中加入马来酸酐和过硫酸铵后加热进行反应；
S3、待反应结束后冷却至室温，再加入粘结剂，分散均匀后得到所述高粘接性水系P(VDF-HFP)浆料。
2.根据权利要求1所述的高粘接性水系P(VDF-HFP)浆料的制备方法，其特征在于，在S1中，所述表面活性剂为脂肪醇聚氧乙烯醚、聚氧乙烯烷基酰胺、聚醚有机硅中的一种；所述P(VDF-HFP)粉体和表面活性剂的重量比为100:0.5-100:10。
3.根据权利要求1所述的高粘接性水系P(VDF-HFP)浆料的制备方法，其特征在于，在S2中，所述P(VDF-HFP)粉体：马来酸酐：过硫酸铵的之间的重量比为100:3-20:0.05-0.3。
4.根据权利要求1所述的高粘接性水系P(VDF-HFP)浆料的制备方法，其特征在于，在S2中，所述加热温度为70-100℃，所述加热时间为50-120分钟。
5.根据权利要求1所述的高粘接性水系P(VDF-HFP)浆料的制备方法，其特征在于，在S3中，所述粘结剂为丙烯酸酯共聚物；所述P(VDF-HFP)粉体和粘结剂的重量比为100:5-100:20。
6.根据权利要求1所述的高粘接性水系P(VDF-HFP)浆料的制备方法，其特征在于，所述高粘接性水系P(VDF-HFP)浆料的固含量为5-20％。
7.一种采用如权利要求1-6所述的制备方法制备的高粘接性水系P(VDF-HFP)浆料。
8.一种高粘接性水系P(VDF-HFP)涂胶隔膜，包括基膜，所述基膜为聚烯烃隔膜或涂覆有陶瓷层的陶瓷隔膜，其特征在于，所述基膜至少一面涂覆如权利要求7所述的P(VDF-HFP)浆料。
9.一种锂离子电池，其特征在于，隔膜采用如权利要求8所述的高粘接性水系P(VDF-HFP)涂胶隔膜。
CN202210795092.1A 2022-07-07 2022-07-07 一种高粘接性水系p(vdf-hfp)涂胶隔膜的制备方法及锂离子电池 Pending CN115074059A (zh)

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CN113416270A (zh) * 2021-05-31 2021-09-21 珠海辰玉新材料科技有限公司 一种聚合物及其制备方法和应用
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CN106848190A (zh) * 2017-02-14 2017-06-13 珠海光宇电池有限公司 负极极片、负极极片的制备方法及锂离子电池
CN106997940A (zh) * 2017-04-29 2017-08-01 合肥国轩高科动力能源有限公司 一种用于锂离子电池隔膜涂覆的水性浆料及其制备方法
CN109161292A (zh) * 2018-08-22 2019-01-08 合肥国轩高科动力能源有限公司 一种自稳定p(vdf-hfp)浆料及其制备方法和锂离子电池隔膜
CN113416270A (zh) * 2021-05-31 2021-09-21 珠海辰玉新材料科技有限公司 一种聚合物及其制备方法和应用
CN114171850A (zh) * 2021-11-24 2022-03-11 天津市捷威动力工业有限公司 一种长耐久涂胶隔膜、其制备方法及包含其的锂离子电池

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