Direct insight into sulfiphilicity-lithiophilicity design of bifunctional heteroatom-doped graphene mediator toward durable Li-S batteries  

作　　者：Haina Ci Menglei Wang Zhongti Sun Chaohui Wei Jingsheng Cai Chen Lu Guang Cui Zhongfan Liu Jingyu Sun 

机构地区：[1]College of Energy,Soochow Institute for Energy and Materials InnovationS(SIEMIS),Key Laboratory of Advanced Carbon Materials and Wearable Energy Technologies of Jiangsu Province,Soochow University,Suzhou 215006,Jiangsu,China [2]SUDA-BGI Collaborative Innovation Center,Soochow University,Suzhou 215006,Jiangsu,China [3]Beijing Graphene Institute(BGI),Beijing 100095,China [4]School of Materials Science and Engineering,Jiangsu University,Zhenjiang 212013,Jiangsu,China [5]Center for Nanochemistry(CNC),Beijing Science and Engineering Center for Nanocarbons,College of Chemistry and Molecular Engineering,Peking University,Beijing 100871,China

出　　处：《Journal of Energy Chemistry》2022年第3期474-482,I0013,共10页能源化学（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(51702225);the National Key Research and Development Program(2019YFA0708201);the Beijing Municipal Science and Technology Commission(Z161100002116020);the China Postdoctoral Science Foundation funded project(2020 M681704,2021 T140493);the support from Suzhou Key Laboratory for Advanced Carbon Materials and Wearable Energy Technologies,Suzhou,China;the support from the Postdoctoral Research Foundation of Jiangsu Province。

摘　　要：The practical applications of lithium-sulfur(Li-S)battery have been greatly hindered by the severe polysulfide shuttle at the cathode and rampant lithium dendrite growth at the anode.One of the effective solutions deals with concurrent management of both electrodes.Nevertheless,this direction remains in a nascent stage due to a lack of material selection and mechanism exploration.Herein,we devise a temperature-mediated direct chemical vapor deposition strategy to realize the controllable synthesis of three-dimensional boron/nitrogen dual-doped graphene(BNG)particulated architectures,which is employed as a light-weighted and multi-functional mediator for both electrodes in Li-S batteries.Benefiting from the“sulfiphilic”and“lithiophilic”features,the BNG modified separator not only enables boosted kinetics of polysulfide transformation to mitigate the shuttle effect but also endows uniform lithium deposition to suppress the dendritic growth.Theoretical calculations in combination with electro-kinetic tests and operando Raman analysis further elucidate the favorable sulfur and lithium electrochemistry of BNG at a molecular level.This work offers direct insight into the mediator design via controllable synthesis of graphene materials to tackle the fundamental challenges of Li-S batteries.

关 键 词：Li-S batteries B/N dual-doped graphene MEDIATOR Shuttle effect Lithium dendrite 

分 类 号：TQ127.11[化学工程—无机化工] TM912[电气工程—电力电子与电力传动]