期刊
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
卷 158, 期 3, 页码 A250-A254出版社
ELECTROCHEMICAL SOC INC
DOI: 10.1149/1.3524260
关键词
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资金
- Korea government (MEST) [R11-2008-058-01003-0]
- Ministry of Education, Science and Technology [NRF-2009-0082069, NRF-2009-0094219]
- Ministry of Knowledge Economy, Republic of Korea [20092020100040]
Here we demonstrate that the electrochemical properties of Mn based olivine cathode materials can be significantly improved by small amount of co-dopants, Fe and Mg. While nucleation and growth are important in determining the kinetics of a two-phase reaction based olivine electrode, the presence of Fe and Mg in LiMnPO(4) framework notably enhances the power capability of a LiMnPO(4) electrode providing multiple nucleation sites. The electrochemical activity of an Fe-Mg co-doped Mn olivine cathode material measured by galvanostatic charge/discharge indicates that a discharge capacity of about 140 mAh g(-1) can be obtained at a C/5 rate and this high capacity is retained at even higher current rates (110 mAh g(-1) at 3C), which has yet to be achieved in LiMnPO(4) without nucleation enhancers. (C) 2011 The Electrochemical Society. [DOI:10.1149/1.3524260] All rights reserved.
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