Synergy of a hierarchical porous morphology and anionic defects of nanosized Li_(4)Ti_(5)O_(12) toward a high-rate and large-capacity lithium-ion battery

作     者：Yanan Li Qianlin Chen Qiangqiang Meng Shulai Lei Fangxiang Song Jingbo Ma Yanan Li;Qianlin Chen;Qiangqiang Meng;Shulai Lei;Fangxiang Song;Jingbo Ma

作者机构：School of Chemistry and Chemical EngineeringGuizhou UniversityGuiyang 550025GuizhouChina School of Pharmaceutical SciencesGuizhou University of Traditional Chinese MedicineGuiyang 550025GuizhouChina National&Local Joint Laboratory of Engineering for Effective Utilization of Regional Mineral Resources from Karst AreasGuiyang 550025GuizhouChina School of Physics and Materials EngineeringHefei Normal UniversityHefei 230601AnhuiChina Hubei Key Laboratory of Low Dimensional Optoelectronic Materials and DevicesHubei University of Arts and ScienceXiangyang 441053HubeiChina 

出 版 物：《Journal of Energy Chemistry》 (能源化学（英文版）)

年 卷 期：2021年第30卷第3期

页      面：699-711页

核心收录：

学科分类：081702[工学-化学工艺] 0808[工学-电气工程] 07[理学] 070205[理学-凝聚态物理] 08[工学] 0817[工学-化学工程与技术] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0702[理学-物理学] 

基　　金：financially supported by the High-level Innovative Talents Training Project of Guizhou Province(QKHPTRC5658) the Guizhou Province Graduate Research Fund(YJSCXJH050) the Guizhou Province Graduate Research Fund(YJSCXJH081) 

主　　题：Lithium titanate Hierarchical morphology Porous Defects Lithium-ion batteries 

摘      要：Exploring electrode materials with a high volumetric energy density and high rate capability remains of a great challenge for nanosized-Li_(4)Ti_(5)O_(12)(LTO)***,hierarchical porous Ti^(3+)-C-N-Br co-doped LTO(LTOCPB-CC)is synthesized using carboxyl-grafted nanocarbon(CC)and cetylpyridinium bromide(CPB)as combined structure-directing ***^(4+)-O-CPB/Li^(+)-CC is designed as a new molecular chelate,in which CPB and CC promote the uniform mixing of Li^(+)and Ti^(4+)and control the morphology of TiO_(2) and the final *** defects(oxygen vacancies and ion dopants)formed during the annealing process increase the electron/hole concentration and reduce the band gap,both of which enhance the n-type electron modification of ***-prepared LTOCPB-CC has a large specific surface area and high tap density,as well as a high electronic conductivity(2.84×10^(-4) S cm^(-1))and ionic conductivity(3.82×10^(-12)cm^(2) s^(-1)),which are responsible for its excellent rate capability(157.7 mA h g^(-1) at 20 C)and stable long-term cycling performance(0.008% fade per cycle after 1000 cycles at 20 C).