电化学2023，Vol.29Issue(3)：56-66,11.DOI:10.13208/j.electrochem.2217006
多活性中心双金属硫化物促进多硫化锂转化构建高性能锂硫电池
Bimetallic Compound Catalysts With Multiple Active Centers for Accelerated Polysulfide Conversion in Li-S Batteries
摘要
Abstract
Practical applications of lithium-sulfur(Li-S)batteries are hindered mainly by the low sulfur utilization and severe capacity fading derived from the polysulfide shuttling.Catalysis is an effective remedy to those problems by pro-moting the conversion of polysulfides to reduce their accumulation in the electrolyte,which needs the catalyst to have efficient adsorption ability to soluble polysulfides and high activity for their conversion.In this work,we have pro-posed a bimetallic compound of NiCo2S4 anchored onto sulfur-doped graphene(NCS@SG)to fabricate a catalytic interlayer for Li-S batteries.Compared to CoS,the NiCo2S4 demonstrated much higher catalytic activity toward sulfur reduction reaction due to its multiple anchoring and catalytic active sites derived from the coordination of the bimetallic centers.As a result,the NCS@SG interlayer dramatically improved the specific capacity,rate performance,and cycling stability of Li-S batteries.Especially,when the areal sulfur loading of the NCS@SG battery increased to 15.3 mg cm-2,the high-capacity retention of 93.9％could be achieved over 50 cycles.关键词
锂硫电池/多硫化锂/催化作用/双金属硫化物催化剂/穿梭效应Key words
Lithium-sulfur batteries/Lithium polysulfides/Catalysis/Bimetallic sulfide catalyst/Shuttle effect引用本文复制引用
化五星,夏静怡,胡忠豪,李欢,吕伟,杨全红..多活性中心双金属硫化物促进多硫化锂转化构建高性能锂硫电池[J].电化学,2023,29(3):56-66,11.基金项目
This work was supported by the National Key R&D Program of China(No.2021YFF0500600),National Natural Science Foundation of China(Nos.51932005 and 52022041),All-Solid-State Lithium Battery Electrolyte Engineering Research Centre(XMHT20200203006)and the China Post-doctoral Science Foundation(2022M710041). （No.2021YFF0500600）
