具有钛空位的碳氧化钛在锂硫电池中的应用  

Application of titanium oxycarbide with titanium vacancies in lithium-sulfur batteries

作　　者：杨晨[1] 张宝 肖九三 焦树强[1,2] 朱鸿民 YANG Chen;ZHANG Bao;XIAO Jiusan;JIAO Shuqiang;ZHU Hongmin(State Key Laboratory of Advanced Metallurgy,University of Science and Technology Beijing,Beijing 100083,China;Southern Marine Science and Engineering Guangdong Laboratory,Zhuhai 519080,China;Advanced Materials Physics and Chemistry Department Engineering Research Department,Tohoku University,Sendai 980-8579,Japan)

机构地区：[1]北京科技大学绿色低碳钢铁冶金全国重点实验室,北京100083 [2]南方海洋科学与工程广东实验室,珠海519080 [3]日本东北大学先进材料物理化学系工学研究科,仙台980-8579

出　　处：《江西冶金》2025年第1期47-54,共8页Jiangxi Metallurgy

基　　金：国家重点研发计划项目(2022YFC2906100)。

摘　　要：锂硫电池较传统的锂离子电池具有能量密度高、价格较低等优势,但也面临着硫导电性差、存在穿梭效应等问题。缺陷构建是优化硫吸附材料的常见手段,空位可作为硫和多硫化锂潜在的吸附位点,增强锂硫电池的电化学性能。本研究以TiC和TiO_(2)为原料,在1173 K下制备具有阳离子钛空位的碳氧化钛(Ti_(0.835)C_(0.625)O_(0.375))材料并将其用于锂硫电池中,表现出比常规碳氧化钛更优异的电化学性能。在电流密度为0.2 C的条件下,Ti_(0.835)C_(0.625)O_(0.375)电极材料首次放电比容量达到1323 mA·h/g,比TiC_(0.625)O_(0.375)锂硫电池高119 mA·h/g。循环200圈后,放电比容量仍可达到405 mA·h/g,每圈衰减率为0.35%,比常规TiC_(0.625)O_(0.375)电极材料低0.03%。Lithium-sulfur batteries have the advantages of high energy density and low price compared to traditional lithium-ion batteries,but they also have problems such as poor conductivity of sulfur and shuttle effect.The construction of vacancy is the common approach to optimize sulfur adsorption materials,and vacancies can be used as potential sites of adsorption for sulfur and lithium polysulfide to strengthen the electrochemical performance of lithium-sulfur batteries.In this study,titanium oxycarbide with the titanium vacancy(Ti_(0.835)C_(0.625)O_(0.375))is prepared from TiC and TiO_(2) at 1173 K.Ti_(0.835)C_(0.625)O_(0.375) used in Li-S batteries shows higher electrochemical performance than normal TiC_(0.625)O_(0.375).At 0.2 C,the initial discharge specific capacity of Ti_(0.835)C_(0.625)O_(0.375) reached 1323 mA·h/g,which is 119 mA·h/g higher than that of TiC_(0.625)O_(0.375).After 200 cycles,the discharge specific capacity is maintained at 405 mA·h/g,with a decay rate of 0.35%per cycle,which is 0.03%lower than normal TiC_(0.625)O_(0.375).

关 键 词：锂硫电池 Ti_(1-y)CxO_(1-x) 电化学性能 碳氧化钛 

分 类 号：O646[理学—物理化学] TG146.23[理学—化学]