Electrochemical characteristics of layered Li(1.95)Mn(0.9)Co(0.15)O(3) (C2/m) as a lithium-battery cathode

Ozawa, Kiyoshi, Nakao, Yasuhiro, Mochiku, Takashi, Cheng, Zhenxiang, Wang, Lianzhou, Iwai, Hideo, Tsuchiya, Yoshinori, Fujii, Hiroki and Igawa, Naoki (2012) Electrochemical characteristics of layered Li(1.95)Mn(0.9)Co(0.15)O(3) (C2/m) as a lithium-battery cathode. Journal of Electrochemical Society, 159 3: A300-A304. doi:10.1149/2.079203jes

Author Ozawa, Kiyoshi
Nakao, Yasuhiro
Mochiku, Takashi
Cheng, Zhenxiang
Wang, Lianzhou
Iwai, Hideo
Tsuchiya, Yoshinori
Fujii, Hiroki
Igawa, Naoki
Title Electrochemical characteristics of layered Li(1.95)Mn(0.9)Co(0.15)O(3) (C2/m) as a lithium-battery cathode
Formatted title
Electrochemical characteristics of layered Li1.95Mn0.9Co0.15O3 (C2/𝑚) as a lithium-battery cathode
Journal name Journal of Electrochemical Society   Check publisher's open access policy
ISSN 0013-4651
Publication date 2012
Sub-type Article (original research)
DOI 10.1149/2.079203jes
Volume 159
Issue 3
Start page A300
End page A304
Total pages 5
Place of publication Pennington, NJ, U.S.A.
Publisher Electrochemical Society
Collection year 2013
Language eng
Formatted abstract
A manganese-based solid solution with the composition of Li1.95Mn0.9Co0.15O3 was synthesized by a simplified coprecipitation method, followed by a combustion technique, and its electrochemical characteristics as a lithium-battery cathode were investigated. Rietveld refinement based on neutron diffraction data revealed that the material is assigned to an Li2MnO3-type structure model with a monoclinic cell due to the space group symmetry of C2/𝑚. In cycling of the Li/Li+/Li1.95Mn0.9Co0.15O3 cell in the potential range of 2.0–4.8 V at current densities of 30 mAg−1, the discharge capacity characteristically increases from 46.3 to 196.5 mAhg−1 as the cycle increases from 1 to 11, and a discharge capacity of >175.5 mAhg−1 is obtained between the 23rd and 58th cycles with small capacity fading of 2.41%. The results of cyclic voltammogram (CV) and X-ray photoelectron spectroscopy (XPS) measurements showed that the manganese redox reaction (Mn3+/Mn4+) in the Li1.95Mn0.9Co0.15O3 system is progressively activated during the first ten-odd cycles, following continuous occurrence of the extraction of oxygen molecules from the electrode material over these charge processes. It could be assumed that such behaviors significantly influence the electrochemical characteristics of the Li1.95Mn0.9Co0.15O3 system.
Keyword Orthorhombic LiMnO2
Orthorhombic LiMnO(2)
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

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Created: Wed, 22 Feb 2012, 01:25:03 EST by System User on behalf of Functional Nanomaterials