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 

机构地区：[1]School of Materials Science and Engineering&Hubei Key Laboratory of Plasma Chemistry and Advanced Materials,Wuhan Institute of Technology,Wuhan 430205,China [2]Faculty of Materials Science and Chemistry,China University of Geosciences,Wuhan 430074,China [3]Guangdong Provincial Key Laboratory of Optical Information Materials and Technology&South China Academy of Advanced Optoelectronics,South China Normal University,Guangzhou 510006,China [4]School of Materials Science and Engineering&State Key Laboratory of Material Processing and Die and Mold Technology,Huazhong University of Science and Technology,Wuhan 430074,China

出　　处：《Nano Research》2022年第7期6200-6207,共8页纳米研究（英文版）

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).

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).

关 键 词：lithium polysulfides Li-S batteries niobium oxynitrides catalyst low temperature 

分 类 号：O643.36[理学—物理化学] TM911[理学—化学]