C/VN正极材料制备及其锂硫电池性能研究  

Design and Preparation of C/VN Cathode and Properties in Lithium Sulfur Batteries

作　　者：张东文 谢坤 朱文凤 杨威威 刘瑞卿 ZHANG Dongwen;XIE Kun;ZHU Wenfeng;YANG Weiwei;LIU Ruiqing(School of Materials Science and Engineering,Nanjing University of Posts and Telecommunications,Nanjing 210023,China)

机构地区：[1]南京邮电大学材料科学与工程学院,江苏南京210023

出　　处：《广州化学》2023年第6期31-35,I0002,共6页Guangzhou Chemistry

基　　金：国家自然科学基金面上项目(22179064)。

摘　　要：制备了一种核壳带状C/VN复合材料,通过SEM和TEM研究了复合材料的形貌结构。以ZIF-8/V_(2)O_(5)·nH_(2)O、C/V_(2)O_(5)和C/VN三种材料作为含硫正极,锂片为负极,1.0MLiTFSI,2%LiNO_(3)/DME∶DOL(体积比1∶1)为电解液,组装锂硫电池进行电化学测试。结果表明:C/VN能够显著提高正极材料的电化学性能,促进充放电过程中的电子转移;S@C/VN在0.5 C的电流密度下初始比容量为900.4 mAh/g,经过500圈后,仍能提供413.9 mAh/g的比容量,展现了S@C/VN优异的循环性能。The core-shell ribbon C/VN composite materials were successfully prepared in this article.The morphology and structure of the composite materials were studied through SEM and TEM.The lithium sulfur batteries were assembled by using ZIF-8/V_(2)O_(5)·nH_(2)O,C/V_(2)O_(5),and C/VN as sulfur containing cathodes,lithium sheets as anode,1.0 M LiTFSI and 2%LiNO_(3)/DME∶DOL(1∶1)as electrolyte for electrochemical testing.The results indicate that the C/VN cathode can significantly improve the electrochemical performance of the cathode and promote electrons transfer during the charging and discharging process.The S@C/VN cathode has an initial specific capacity of 900.4 mAh/g at a current density of 0.5 C.After 500 cycles,it can still provide a specific capacity of 413.9 mAh/g,demonstrating the excellent cycling performance of S@C/VN cathode.

关 键 词：锂硫电池 正极材料 ZIF-8 五氧化二钒 氮化钒 复合材料 

分 类 号：TQ152[化学工程—电化学工业]