任意方向可弯的锂离子电池压印柔性厚电极

Bendable-in-any-direction imprinted flexible thick electrodes for Li-ion batteries

提出半固化电极的机械压印方法制备锂离子电池压印柔性厚电极,兼顾了厚电极的高储能性能和高柔性.在基本不改变锂离子电池电极传统湿法制备工艺的前提下,在电极干燥阶段引入机械压印步骤,从而在数百微米厚的电极中构建网络通道结构,使电极获得了任意方向可弯的能力.进一步,基于有限元分析给出压印厚电极在不同弯曲方向下的临界弯曲半径.此外,压印引入的网络通道结构提升电极内的离子传输效率,使全电池实验中压印厚电极在高倍率下的电化学性能显著优于常规厚电极,且电池在弯曲状态下拥有良好且稳定的电化学性能.研究结果为高性能多功能储能电池的研发提供了基于电极结构设计的新思路.

A method of mechanical imprinting on semi-solid electrodes is proposed to prepare a imprintedflexible thick electrode for lithium-ion batteries(LIBs).This method balances the conflict between high energy storage performance and highflexibility without significantly altering the traditional wet preparation process of LIB electrodes.By introducing an imprinting step during the electrode drying stage,a network channel structure can be constructed in the electrode with hundreds of microns thickness.Consequently,the prepared electrode can bend in any direction. Further, based on finite element analysis,the critical bending radius of the imprinted thick electrode in different bending directionsis determined. Additionally, the network channel structure introduced by imprinting enhances ion transport effciency in the electrode, significantly improving its electrochemicalperformance at high C-rates. Meanwhile, the battery containing the flexible thick electrodemaintains good and stable electrochemical performance in the bending state. The resultsof this paper provide a new path for the development of high-performance multi-functionalenergy storage batteries.