双拉BOPP薄膜、使用双拉BOPP薄膜的复合集流体及其制备方法
By grafting polar additives onto the surface of BOPP film and depositing a conductive layer, the problems of easy breakage and insufficient adhesion of lithium-ion battery current collectors are solved, thereby improving the battery's energy density and resistance to electrolyte corrosion.
CN116285109BActive Publication Date: 2026-07-17CHENGDU KECHENG FINE CHEM TECH CO LTD
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- CHENGDU KECHENG FINE CHEM TECH CO LTD
- Filing Date
- 2023-03-17
- Publication Date
- 2026-07-17
AI Technical Summary
Technical Problem
Existing lithium-ion battery current collectors are prone to breakage when their thickness is reduced, and the adhesion between the conductive layer and the polymer film is insufficient, affecting the battery's energy density and resistance to electrolyte corrosion.
Method used
A biaxially stretched BOPP film is used, and polar additives, such as maleic anhydride-modified polyolefin, are grafted onto its surface. Then, conductive layers are deposited on both sides of the film, and a composite current collector is formed by vacuum evaporation or magnetron sputtering.
Benefits of technology
This improved the adhesion between the BOPP film and the conductive layer, enhancing the battery's energy density and resistance to electrolyte corrosion.
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Smart Images
Figure CN116285109B_ABST
Abstract
本发明提供一种双拉BOPP薄膜、使用双拉BOPP薄膜的复合集流体及其制备方法，包括依次设置的导电层、基体、导电层，粘结性BOPP薄膜原料中加入了极性添加剂，使BOPP薄膜具有粘结性。其制备方法：S1.极性添加剂的制备，即将不饱和羧酸或其酸酐与聚烯烃反应，制备出具有极性的添加剂；S2.在双拉BOPP时，把该添加剂加入到BOPP的原料中，进而进行双拉成BOPP薄膜，因添加剂的极性较强，使薄膜具有粘结性；S3.将导电层粘接在BOPP基膜上，得到导电层、粘结性BOPP基体、导电层结构。采用本发明中极性添加剂可以很好的增强导电层与基体的附着力，解决了复合集流体的粘结力问题；同时具有耐电解液腐蚀的特点，增加在电池使用中的可靠性。
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