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Electrospinning synthesis of novel lithium-rich 0.4Li2MnO3.0.6LiNi1/3CO1/3Mn1/3O2 nanotube and its electrochemical performance as cathode of lithium-ion battery

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Advances in Manufacturing 2016年第1期4卷 79-88页

作者： Lei-Lei Cui Xiao-Wei Miao Yu-Feng Song Wen-Ying Fang Hong-Bin Zhao Jian-Hui Fang Department of Chemistry Shanghai UniversityShanghai 200444 People's Republic of China Shanghai Key Laboratory of Mechanics in EnergyEngineering Shanghai University Shanghai 200072People's Republic of China Department of Chemical Engineering University ofWaterloo Waterloo N2L3G1 Canada

In this study, a lithium-rich 0.4Li2MnO3.0.6LiNi1/3Co1/3Mn1/3O2 nanotube layered cathode synthesized by novel electrospinning is reported, and the effects of temperature on the electrochemical performance and morphologies are investigated. The crystal structure is characterized by X-ray diffraction patterns, and refined by two sets of diffraction data （R-3m and C2/m）. Refined crystal structure is 0.4Li2MnO3.0.6LiNi1/3COl/3Mn13O2 compos- ite. The inductively coupled plasma optical emission spec- trometer and thermogravimetric and differential scanning calorimetry analysis measurement supply reference to opti- mize the calcination temperature and heat-treatment time. The morphology is characterized by scanning and high- resolution transmission electron microscope techniques, and the micro-nanostructured hollow tubes of Li-rich 0.4Li2MnO3-0.6LiNil/3COl/3Mn1/3O2 composite with outer diameter of 200-400 nm and the wall thickness of 50-80 nm are synthesized successfully. The electrochemical evaluation shows that 0.4Li2MnO3.0.6LiNi1/3Cov3Mn1/3O2 sintered at 800 ℃ for 8 h delivers the highest capacity of the first dis- charge capacity of 267.7 mAh/g between 2.5 V and 4.8 V at 0.1C and remains 183.3 mAh/g after 50 cycles. The electro- spinning method with heat-treatment to get micro-nanos- tructured lithium-rich cathode shows promising application inlithium-ion batteries with stable electrochemical performance and higher C-rate performance for its shorter Li ions transfer channels and stable designed structure.

关键词： Electrospinning cathode - nanotube Lithium-rich Lithium battery

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