Journal
MATERIALS RESEARCH BULLETIN
Volume 43, Issue 12, Pages 3543-3552Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.materresbull.2008.01.011
Keywords
Inorganic compounds; Chemical synthesis; XAFS (EXAFS and XANES); Electrochemical properties
Categories
Funding
- POSTECH
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A mixed cathode material between Li2MnO3 and Li[Mn1/3Ni1/3Co1/3]O-2 for high capacity lithium secondary batteries was introduced in this study. It was prepared using the sucrose combustion process because this is a simple process. The oxidation states of Mn, Co and Ni ions in the pristine Li[Li(1-x)/3Mn(2-x)/3Nix/3Cox/3]O-2 compounds were confirmed to be tetravalent, trivalent and divalent, respectively. via XANES measurements. Electrochemical charge/discharge studies showed that the highest first discharge capacity of 224 mAh/g was obtained in composition of x = 0.5 at a 0.2 C rate. The oxidation state of the Co and Ni ions in the Li[Li1/6Mn1/2Ni1/6Co1/6]O-2 changed to higher oxidation states, but that of the Mn ions did not change. (C) 2008 Elsevier Ltd. All rights reserved.
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