期刊
JOURNAL OF POWER SOURCES
卷 240, 期 -, 页码 530-535出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2013.04.047
关键词
Cathode material; Sodium-ions content; Layered lithium-excess; Solid solution; Lithium-ion batteries
资金
- Key Research Program of Chinese Academy of Sciences [KGZD-EW-202-4]
- 973 program [2011CB935900]
- Natural Science Foundation of Ningbo [2012A610126]
- Ningbo Science and Technology Innovation Team [2012B82001]
The Li1.2-xNaxNi0.13Co0.13Mn0.54O2 (0 <= x <= 0.1) cathode materials have been synthesized by a solid-state reaction method. The effects of the Na+ contents on the structure, surface components and electrochemical performance are studied by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and electrochemical techniques. The XRD data indicate that the Li(1.2-x)Na(x)Ni(0.13)Co(0.13)Mb(0.54)O(2) samples evolve from a sole layered structure.(0 <= x <= 0.02) to a mixture of Na+-contained layered structure (0.02 < x <= 0.1), which would transform into the single layered structure after the initial charge and discharge process. XPS data demonstrate that some of the Na+ ions could be reversibly de-/re-intercalated for the Li1.2-xNaxNi0.13Co0.13Mn0.54O2 materials. An electrochemical test reveals that a small amount of Na+ (x <= 0.02) in the Li(1.2-x)Na(x)Ni(0.13)Co(0.13)Mb(0.54)O(2) materials can significantly increase the rate capacity, yet the capacity retention becomes worse. We also find that the capacity retention increases with the Na+ contents. (C) 2013 Elsevier B.V. All rights reserved.
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