Flame-retarding battery cathode materials based on reversible multi-electron redox chemistry of phenothiazine-based polymer  

作　　者：Jing Lv Jing Ye Gaole Dai Zhihui Niu Yi Sun Xiaohong Zhang Yu Zhao 

机构地区：[1]Institute of Functional Nano and Soft Materials(FUNSOM),Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices,Soochow University,Suzhou 215123,Jiangsu,China [2]Analytical and Testing Centre,Soochow University,Suzhou 215123,Jiangsu,China [3]School of Physics and Optoelectronic Engineering,Shandong University of Technology,Zibo 250049,Shandong,China [4]College of Textile and Clothing Engineering,Soochow University,Suzhou 215123,Jiangsu,China

出　　处：《Journal of Energy Chemistry》2020年第8期256-262,I0009,共8页能源化学（英文版）

基　　金：financial support from the National Natural Science Foundation of China (grant no.51772199);the Natural Science Foundation of Jiangsu Province (Grant no.BK20170329);the Collaborative Innovation Center of Suzhou Nano Science & Technology;the Priority Academic Program Development of Jiangsu Higher Education Institutions;the 111 Project。

摘　　要：Polymeric organic battery materials are promising alternatives to the transition-metal-based ones owing to their enriched chemistries. However, the flammability of organic compounds brings in serious concern on battery safety. In addition to use flame-retarding electrolyte/electrolyte additives or battery separators,flame retardancy can readily be achieved through the integration of flame-retarding unit into the polymer backbone, imparting the flame retardancy permanently. The as-designed polymer based on phenothiazine shows significantly shortened self-extinguished time without deteriorating its intrinsic thermodynamic and electrochemical properties. Moreover, two electron per phenothiazine molecule is realized for the first time in a highly reversible manner with discharge voltages of 3.52 V and 4.16 V versus Li+/Li and an average capacity of ca. 120 mAh g-1 at a current rate of 2 C. The origin of the reversibility is investigated through density functional theory(DFT) calculations. These findings address the importance of molecular design for safer and more stable organic materials for batteries.

关 键 词：Flame retardancy Molecular design PHENOTHIAZINE BATTERIES Energy storage 

分 类 号：TM91[电气工程—电力电子与电力传动]