期刊
JOURNAL OF POWER SOURCES
卷 256, 期 -, 页码 66-71出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2014.01.059
关键词
High voltage; Core-shell structure; Concentration gradient; Rate capability; Lithium-ion battery
资金
- Key Research Program of Chinese Academy of Sciences [KGZD-EW-202-4]
- Natural Science Foundation of Zhejiang [LY13B030007]
- Key Technology R&D Program of Ningbo [2012B10021]
- Ningbo Science and Technology Innovation Team [2012B82001]
Spherical LiNi0.5Mn1.5O4 material with a core-shell structure is synthesized by a urea-assisted hydrothermal method followed by heat treatment with LiOH at high temperature. After the process of hydrothermal treatment, the carbonate precursor with a concentration gradient is produced, in a single spherical particle, the content of Ni in the surface is higher than that in the center while Mn has a reversal trend. LiNi0.5Mn1.5O4 synthesized through the hydrothermal route has a great improvement in cycling stability at elevated temperature and rate capability. The capacity retention can maintain at 95% after 30 cycles at 55 degrees C. Furthermore, it can deliver a discharge capacity of 118 mAh g(-1) at a high rate of 10 C at room temperature. Such excellent electrochemical properties of LiNi0.5Mn1.5O4 can be ascribed to its unique core shell structure and nano-size particle. (C) 2014 Elsevier B.V. All rights reserved.
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