SbVO4 based high capacity potassium anode:a combination of conversion and alloying reactions

• 作者: Xianhui Yi Junmin Ge Jiawan Zhou Jiang Zhou Bingan Lu
• 来源期刊: 中国科学：化学（英文版）
• 年，卷（期）: 2021,（2）
• 所属期刊栏目: ARTICLES
• 页码范围: 238-244
• 页数: 7页
• 语种: 英文

摘要

As the key to optimizing potassium ion batteries'(PIBs)performance,the development of high capacity potassium anode is the footstone.Here,through a one-step solvothermal method,uniformly dispersed SbVO4 nanoparticles on the reduced graphene oxide nanosheets(SbVO4@RGO)were synthesized and used as PIBs anodes.SbVO4@RGO anode shows high capacity due to alloying and conversion reactions occur simultaneously in the cyclic process.The anode delivers a capacity as high as 447.9 mAh g-1 at 100 mA g-1.Besides,a cycling life of 500 cycles with small average capacity decay rate(only 0.106％per cycle)is also revealed.It was found in the initial discharge process,SbVO4 transforms into Sb and K3VO4.And in the following cycle Sb and K3VO4 simultaneously react with K+via the alloying/de-alloying and conversion reaction,respectively.The present study of SbVO4@RGO may provide insight for high performance alloying-based/conversion-based potassium anodes.