Enhanced polysulfide redox kinetics by niobium oxynitrides via insitu adsorptive and catalytic effect in wide temperature range

作     者：Benben Wei Chaoqun Shang Qiao Cu Le Hu Xuelian Fu Guofu Zhou Xin Wang Benben Wei;Chaoqun Shang;Qiao Cu;Le Hu;Xuelian Fu;Guofu Zhou;Xin Wang

作者机构：School of Materials Science and Engineering&Hubei Key Laboratory of Plasma Chemistry and Advanced MaterialsWuhan Institute of TechnologyWuhan 430205China Faculty of Materials Science and ChemistryChina University of GeosciencesWuhan 430074China Guangdong Provincial Key Laboratory of Optical Information Materials and Technology&South China Academy of Advanced OptoelectronicsSouth China Normal UniversityGuangzhou 510006China School of Materials Science and Engineering&State Key Laboratory of Material Processing and Die and Mold TechnologyHuazhong University of Science and TechnologyWuhan 430074China 

出 版 物：《Nano Research》 (纳米研究（英文版）)

年 卷 期：2022年第15卷第7期

页      面：6200-6207页

核心收录：

学科分类：0808[工学-电气工程] 081705[工学-工业催化] 08[工学] 0817[工学-化学工程与技术] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 0702[理学-物理学] 

基　　金：This research was funded by the National Natural Science Foundation of China(No.52102296) the Guangzhou Municipal Science and Technology Bureau(No.202102020055) the Science and Technology Program of Guangzhou(No.2019050001) Outstanding Youth Project of Guangdong Natural Science Foundation(No.2021B1515020051) Yunnan Expert Workstation(No.202005AF150028). 

主　　题：lithium polysulfides Li-S batteries niobium oxynitrides catalyst low temperature 

摘      要：The development of Li-S batteries(LSBs)is hindered by the low utilization of S species and sluggish redox reaction kinetics.Polar metal oxides always possess high adsorption to polar S species,while conductive metal nitrides show fast electron transport and ensure fast redox reaction of S species.The combination merits of metal oxides and metal nitrides in one provide an effective strategy to improve the electrochemical performance of LSBs.In this work,defect design of niobium oxynitrides highly dispersed on graphene(NbON-G)is evaluated as effective trapper and catalyst for S species.Owning to the effective structural merits including enriched active sites,alleviated volume variation,defect modulated electronic property,and in-situ chemisorption and catalytic conversion of soluble lithium polysulfides(LiPSs),the LSBs with NbON-G modified separator show remarkably enhanced performance compared to NbN-G and Nb_(2)O_(5)-G.Surprisingly,even at low temperature of−40°C,the LSBs with NbON-G can operate for 1,000 cycles with 0.04%capacity decay per cycle(Rate:2 C).