Rapid synthesis of Li4Ti5O12/graphene composite with superior rate capability by a microwave-assisted hydrothermal method

被引:76
作者
Shi, Yi [1 ,2 ,3 ]
Gao, Jie [1 ]
Abruna, Hector D. [1 ]
Liu, Huakun [2 ]
Li, Huijun [3 ]
Wang, Jiazhao [2 ]
Wu, Yuping [4 ,5 ]
机构
[1] Cornell Univ, Dept Chem & Biol Chem, Ithaca, NY 14853 USA
[2] Univ Wollongong, Inst Superconducting & Elect Mat, Wollongong, NSW, Australia
[3] Univ Wollongong, Ctr Electron Microscopy, Wollongong, NSW 2522, Australia
[4] Fudan Univ, Dept Chem, NEML, Shanghai 200433, Peoples R China
[5] Fudan Univ, Shanghai Key Lab Mol Catalysis & Innovat Mat, Shanghai 200433, Peoples R China
基金
澳大利亚研究理事会; 中国国家自然科学基金;
关键词
Lithium titanate; Lithium ion battery; Graphene; LITHIUM-ION BATTERIES; ANODE MATERIALS; GRAPHENE; PERFORMANCE; CATHODES; NANOSTRUCTURES; NANOSHEETS; CO;
D O I
10.1016/j.nanoen.2014.06.009
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Li4Ti5O12 microspheres composed of nanofiakes wrapped in graphene nanosheets have been synthesized by an advanced microwave-hydrothermal (MW-HT) method for the preparation following by an annealing step. Microwave-assisted synthesis processes are appealing, as they can rapidly synthesize materials with a high degree of control of particle size and morphology at low cost. The resultant composite reveals a unique loose structure which could avoid the restacking of graphene sheets and offer rapid lithium ion diffusion paths. Therefore the Li4Ti5O12/graphene electrode has highly desirable properties: a specific capacity approaching the theoretical value, stable cycling, and exceptional rate capability. The composite also can be a good indicator of the remained charge and discharge capacity since it presents a curved charge and discharge line instead of a stable plateau. (C) 2014 Elsevier Ltd. All rights reserved.
引用
收藏
页码:297 / 304
页数:8
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