High-performance lithium ion battery diaphragm based on covalent coupling and preparation method thereof

The invention belongs to the technical field of lithium ion battery diaphragms, and discloses a high-stability lithium ion battery diaphragm based on covalent coupling and a preparation method thereof. According to the invention, a covalent coupling strategy is adopted, and the binder and the ceramic particles are covalently connected through the epoxy silane coupling agent, so that the covalently cross-linked composite diaphragm is formed. The covalently coupled composite diaphragm shows excellent microstructure stability, thermal stability and peel strength, so that the cycle performance of the battery is remarkably improved. In addition, the covalent coupling composite diaphragm is excellent in electrolyte wettability, and the ionic conductivity is improved. Cyclic stability and rate performance tests show that the covalent coupling composite diaphragm has excellent performance. 本发明属锂离子电池隔膜技术领域，公开了一种基于共价偶联的高稳定性锂离子电池隔膜及其制备方法。本发明采用共价偶联策略，通过环氧硅烷偶联剂，将粘结剂与陶瓷颗粒共价连接，形成共价交联的复合隔膜。共价偶联的复合隔膜展示出了优异的微观结构稳定性，热稳定性，剥离强度，使