化学发泡法调控细菌纤维素/二氧化硅复合隔膜形态结构及锂电池性能  

Modulation of core-shell structure of silica bacterial cellulosecomposite separator and performance of lithium battery bychemical foaming method

作　　者：谢友森 朱海峰 刘艳[1] 那兵[1] 张帅程 陈传红[1] XIE Yousen;ZHU Haifeng;LIU Yan;NA Bing;ZHANG Shuaicheng;CHEN Chuanhong(School of Chemical Biology and Materials Science,East China University of Technology,Nanchang 330000,China)

机构地区：[1]东华理工大学化学生物与材料科学学院,南昌330000

出　　处：《功能材料》2022年第10期10190-10195,共6页Journal of Functional Materials

基　　金：国家自然科学基金项目(21965001,21764001);江西省主要学科学术和技术带头人项目(20194BCJ22011)。

摘　　要：隔膜是制约高性能锂离子电池发展的一个重要组件。具有生物降解性和电解液亲和性的高性能纤维素隔膜发展前景良好。然而,纤维素纳米纤维之间强烈的氢键作用通常导致形成致密的膜而不是理想的多孔膜。提出一个新的策略,通过化学发泡结合纳米二氧化硅颗粒杂化调控细菌纤维素(CF&SiO_(2))复合隔膜形态结构,制备出具有核壳结构的CF&SiO_(2)隔膜。该隔膜具有出色的热稳定(200℃)和1.44mS/cm的高离子电导率。由LiFePO_(4)阴极和锂阳极组装的纽扣式电池在5C下具有优越的循环稳定性,300次循环后仍保持124.7mAh/g的高比容量。The separator is an essential part restricting the development of high-performance lithium-ion batteries.High-performance cellulose separators with biodegradability and electrolyte affinity are promising.However,the strong hydrogen bonding between cellulose nanofibers usually leads to the formation of dense membranes rather than ideal porous membranes.In this paper,a different strategy is suggested to prepare a CF&SiO_(2) separator with a core-shell structure by regulating the morphology of bacterial cellulose(CF&SiO_(2))composite separators by chemical foaming combined with nano-silica particles hybridization.The CF&SiO_(2) separator has excellent thermal stability(200℃)and high ionic conductivity of 1.44 mS/cm.The coin-cell battery is assembled from LiFePO_(4) cathode and Li anode exhibited superior cycling stability at 5 C,holding a high specific capacity of 124.7 mAh/g after 300 cycles.

关 键 词：化学发泡 细菌纤维素 纳米二氧化硅 核壳结构 

分 类 号：TB332[一般工业技术—材料科学与工程]