Bidirectionally polarizing surface chemistry of heteroatom-doped carbon matrix towards fast and longevous lithium-sulfur batteries  

作　　者：Hongyang Li Bo Cai Yingze Song Wenlong Cai Gaoran Li 

机构地区：[1]MIIT Key Laboratory of Advanced Display Materials and Devices,College of Materials Science and Engineering,Nanjing University of Science and Technology,Nanjing210094,China [2]State Key Laboratory of Organic Electronics and Information Displays&Institute of Advanced Materials(IAM),Nanjing University of Posts&Telecommunications,Nanjing210023,China [3]State Key Laboratory of Environmental-Friendly Energy Materials,School of Materials Science and Engineering,Southwest University of Science and Technology,Mianyang621010,China [4]Department of Advanced Energy Materials,College of Materials Science and Engineering,Sichuan University,Chengdu 610064,China

出　　处：《Chinese Chemical Letters》2023年第7期313-317,共5页中国化学快报（英文版）

基　　金：financially supported by the National Natural Science Foundation of China (No. 22109072);the Natural Science Foundation of Jiangsu Province (No. BK20210349);the China Postdoctoral Science Foundation (No. 2021M691586);the Postdoctoral Research Funding Scheme of Jiangsu Province (No. 2021K446C);the Shuangchuang (Mass Innovation and Entrepreneurship) Program of Jiangsu Province (No. JSSCBS20210208)。

摘　　要：Herein, a bidirectional polarization strategy is proposed for hosting efficient and durable lithium-sulfur battery(Li-S) electrochemistry. By co-doping electronegative N and electropositive B in graphene matrix(BNrGO), the bidirectional electron redistribution enables a higher polysulfide affinity over its monodoped counterparts, contributing to strong sulfur immobilization and fast conversion kinetics. As a result,BNrGO as the cathode host matrix realizes excellent cycling stability over 1000 cycles with a minimum capacity fading of 0.027% per cycle, and superb rate capability up to 10 C. Meanwhile, decent areal capacity(6.46 m Ah/cm^(2)) and cyclability(300 cycles) are also achievable under high sulfur loading and limited electrolyte. This work provides instructive insights into the interaction between doping engineering and sulfur electrochemistry for pursuing superior Li-S batteries.

关 键 词：Lithium-sulfur battery Facile synthesis Heteroatom doping Bidirectional polarization Shuttle effect 

分 类 号：O646[理学—物理化学] TM912[理学—化学]