In-situ electropolymerized bipolar organic cathode for stable and high-rate lithium-ion batteries  

原位电化学聚合方法制备稳定且高倍率的锂离子电池双极性有机正极材料

作　　者：Wei Wang Chen Zhao Jixing Yang Peixun Xiong Hai Su Yunhua Xu 王微;赵晨;杨继兴;熊佩勋;苏海;许运华(School of Materials Science and Engineering,Key Laboratory of Advanced Ceramics and Machining Technology(Ministry of Education)and Tianjin Key Laboratory of Composite and Functional Materials,Tianjin University,Tianjin 300072,China)

机构地区：[1]School of Materials Science and Engineering,Key Laboratory of Advanced Ceramics and Machining Technology(Ministry of Education)and Tianjin Key Laboratory of Composite and Functional Materials,Tianjin University,Tianjin 300072,China

出　　处：《Science China Materials》2021年第12期2938-2948,共11页中国科学（材料科学（英文版）

基　　金：supported by the National Natural Science Foundation of China (51672188 and 52073211)。

摘　　要：To address the dissolution issue and enhance the electrochemical performance of organic electrode materials,herein, a bipolar organic cathode was prepared by in-situ electropolymerization of amino-phenyl carbazole naphthalene diimide(APCNDI). APCNDI is composed of n-type 1,4,5,8-naphthalene tetracarboxylic diimide that stores Li cations and p-type carbazole groups which react with anions and serve as polymerization sites. Electropolymerization completely eliminated the dissolution problem of APCNDI, and the electropolymerized cathode demonstrated a bipolar reaction with excellent electrochemical performance, stable cycling performance with a capacity retention of 92 mA h g;after1000 cycles, and a superior rate performance of 72 mA h g;at 10 A g;. The bipolar feature and reactions of APCNDI were systematically investigated and verified by multiple characterization techniques. Our findings provide a novel strategy for the design and fabrication of electrodes for high-performance organic batteries.为了解决有机电极材料的溶解问题并提高电化学性能,本文通过原位电化学聚合的方法制备了双极性对氨基苯基咔唑萘二酰亚胺(APCNDI)有机正极材料.该正极由能够储存锂离子的n型1,4,5,8-萘四甲酰基二酰亚胺基团和吸附阴离子的p型的咔唑基团组成,其中咔唑基团同时可以充当电化学聚合反应位点.由原位电化学聚合方法制备的该正极材料有效解决了有机材料在电解质中的溶解问题,表现出双极性特征的氧化还原反应,并具有出色的倍率性能和稳定的循环性能.该有机正极材料循环1000次后的容量仍能保持为92 mA h g^(-1),在10 A g^(-1)的大电流密度下比容量剩余72 mA h g^(-1).同时,通过多种表征手段对APCNDI正极材料的双极性特征和反应机理进行了系统的研究和验证.该发现为发展高性能的有机电极材料提供了一种新颖的设计思路和制备方法.

关 键 词：lithium-ion battery bipolar organic cathode in-situ electropolymerization polyimide CARBAZOLE 

分 类 号：TM912[电气工程—电力电子与电力传动] TQ316.3[化学工程—高聚物工业]