锂硫电池隔膜功能化设计  

Functional Design of Separator for Li-S Batteries

作　　者：孙皓[1] 宋程威 庞越鹏[1] 郑时有[1] Hao Sun;Chengwei Song;Yuepeng Pang;Shiyou Zheng(School of Materials Science and Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China)

机构地区：[1]上海理工大学材料科学与工程学院,上海200093

出　　处：《化学进展》2020年第9期1402-1411,共10页Progress in Chemistry

基　　金：国家自然科学基金项目(No.51671135)资助。

摘　　要：锂硫电池具有较高的理论比容量(以硫计1675 mAh·g^-1和2600 Wh·kg^-1),以及低成本和绿色环保等优势,成为最有前景的下一代可充电储能器件之一。然而,锂硫电池内部严重的多硫化锂穿梭现象导致了电池容量的下降和使用寿命的快速降低。为实现锂硫电池的商业化,其严重的"穿梭效应"亟需改善。普通的商业隔膜有很大的孔径(500 nm),且不具有阻碍多硫化锂迁移的功能。因此,对隔膜进行表面修饰,引入功能化修饰层就成为了一种很有效的策略。本文综述了近年来隔膜表面修饰所遵循的方法以及在此基础上开发的新型隔膜,并对功能化的隔膜在提升锂硫电池性能上的前景进行了展望。With its excellent theoretical performance(1675 mAh·g^-1 and 2600 Wh·kg^-1 based on S),low cost and environmental friendliness,Li-S batteries have become one of the most promising candidates for next generation rechargeable energy storage devices.However,the severe shuttling of lithium polysulfides results in the decrease of capacity and short life.In order to promote its commercial application,it is the key point to suppress the shuttling effect.The commercial separator has a large pore size up to about 500 nm,and is ineffective in suppressing the migration of soluble lithium polysulfides.Hence,it is an effective strategy to introduce the functional modification layer to the separator.This article reviews the principles for surface modification of separator and the newly developed separator based on the principle.Moreover,the prospect of separator modification in improving Li-S batteries is prospected.

关 键 词：锂硫电池 穿梭效应 隔膜 表面修饰 

分 类 号：O646[理学—物理化学] TM911[理学—化学]