MXene衍生的V_(2)C量子点助力高性能锂硫电池的构建及催化机制研究  

Research on the construction of high-performance lithium-sulfur batteries and catalytic mechanism assisted by MXene derived V_(2)C quantum dots

作　　者：徐仕翀[1] 李宇宁 李佳新 张建 郑舜日 于灏 杜史记 王妍洁 XU Shi-chong;LI Yu-ning;LI Jia-xin;ZHANG Jian;ZHENG Shun-ri;YU Hao;DU Shi-ji;WANG Yan-jie(College of Physics,Jilin Normal University,Siping 136000,China)

机构地区：[1]吉林师范大学物理学院,吉林四平136000

出　　处：《吉林师范大学学报(自然科学版)》2025年第2期24-31,共8页Journal of Jilin Normal University:Natural Science Edition

基　　金：国家自然科学基金项目(22478149);吉林省科技发展计划项目(YDZJ202201ZYTS539,YDZJ202201ZYTS305)。

摘　　要：在锂硫电池的充放电循环过程中,由可溶性多硫化锂(LiPSs)引起的穿梭效应严重阻碍了锂硫电池的实际应用.因此,如何控制锂硫化学反应抑制液相LiPSs穿梭是提升锂硫电池性能的主要策略.本文基于微波溶剂热方法制备了V_(2)C MXene衍生量子点(V_(2)C MQDs),并以其作锂硫电池的电催化剂,探究了差异加热时间与MXene材料衍生的量子点(MQDs)的微观结构和电化学性能相互调制关系,解析了V_(2)C MQDs催化作用机制.研究表明,4 min所制备的V_(2)C MQDs作为锂硫电池催化剂,展现出的初始容量可提升至2140 mA·h/g,且在0.2 C下可稳定进行充放电循环500次.引入V_(2)C MQDs可以抑制多硫化锂穿梭效应,增强氧化还原动力学,从而提高了硫的利用率,为优化锂硫电池电化学性能提供了新思路.During the charge-discharge cycle of lithium-sulfur batteries,the shuttle effect caused by soluble lithium polysulfide(LiPSs)seriously hinders the practical application of lithium-sulfur batteries.Therefore,how to control the lithium-sulfur chemical reaction and inhibit the shuttle of liquid-phase LiPSs is the main strategy to improve the performance of lithium-sulfur batteries.In this study,V_(2)C MXene-derived quantum dots(V_(2)C MQDs)were prepared based on microwave solvothermal methods and used as electrocatalysts for lithium-sulfur batteries.The relationship between the microstructure and electrochemical properties of differential heating time V_(2)C MQDs was explored,and the catalytic mechanism of V_(2)C MQDs was analyzed.The initial capacity of the prepared lithium-sulfur battery with 4 min-V_(2)C MQDs as catalyst can be increased to 2140 mA·h/g,and the charge-discharge cycle can be stably carried out 500 times at 0.2 C.The introduction of MQDs can inhibit the shuttle effect of lithium polysulfide and enhance the redox kinetics,thereby improving the utilization rate of sulfur,providing a new idea for optimizing the electrochemical performance of lithium-sulfur batteries.

关 键 词：MXene 量子点 微波法 锂硫电池 

分 类 号：TB302[一般工业技术—材料科学与工程]