摘要
Ti_(2)Nb_(10)O_(29)具有理论容量高、结构稳定、安全性好等优势,是非常有应用前景的锂离子电池和锂离子电容器用新型负极材料,但其电子导电率极低,限制了应用。采用Mo掺杂和碳包覆双协同策略,经优化葡萄糖添加量所制Mo_(0.05)Ti_(1.95)Nb_(10)O_(29)/C复合负极材料显著提升了充放电性能,0.1C充放电的可逆容量达到了313.6mAh/g,10C倍率下的可逆容量比Ti_(2)Nb_(10)O_(29)的提升了72.3mAh/g,高达174.3mAh/g,且0.5C循环100圈后容量损失仅2.4%。第一性原理分析证明,该电性能的提升主要归因于Mo掺杂导致的Ti_(2)Nb_(10)O_(29)材料本征电子导电性提高及碳包覆导致的材料颗粒间电子传输行为改善。
Ti_(2)Nb_(10)O_(29)has advantages such as high theoretical capacity,stable structure,and good safety,making it a promising new anode material for lithium-ion batteries and lithium-ion capacitors.However,its application is limited by its extremely low electronic conductivity.A dual synergistic strategy of Mo doping and carbon coating was adopted to prepare the Mo_(0.05)Ti_(1.95)Nb_(10)O_(29)/C composite anode material by optimizing the glucose addition,which significantly improved its electrochemical performance.The reversible capacity at 0.1C reached 313.6mAh/g,and the reversible capacity at 10C was 72.3mAh/g higher than that of Ti_(2)Nb_(10)O_(29),reaching 174.3mAh/g.In addition,its capacity loss was only 2.4%after 100 cycles at 0.5C.The first-principles analysis demonstrated that the improvement of the electrochemical performance was mainly attributed to the enhancement in intrinsic electronic conductivity of Ti_(2)Nb_(10)O_(29)caused by Mo doping,as well as the boost in electron transfer behavior between material particles caused by carbon coating.
作者
张昊
党兆涵
韩现英
卫高阳
刘奇豪
李建刚
Zhang Hao;Dang Zhaohan;Han Xianying;Wei Gaoyang;Liu Qihao;Li Jiangang(Beijing Key Laboratory of Fuel Cleaning and Efficient Catalytic Emission Reduction Technology,College of New Materials and Chemical Engineering,Beijing Institute of Petrochemical Technology,Beijing 102617;Sinopec Engineering Incorporation,Beijing 100101)
出处
《化工新型材料》
CAS
CSCD
北大核心
2024年第8期131-135,146,共6页
New Chemical Materials
基金
北京市教委科研计划一般项目(KM202310017003)。
