期刊
SOLID STATE SCIENCES
卷 11, 期 1, 页码 271-274出版社
ELSEVIER
DOI: 10.1016/j.solidstatesciences.2008.06.005
关键词
First-principle calculation; Li-ion battery; Cathode material; Monoclinic LiMnO2; Phase transition
资金
- Program for Changjiang Scholars and Innovative Research Team in University [IRT0625]
- Key Project of Chinese Ministry of Education [10411]
- Special Funds for Major State Basic Research Project, PR China [2002CB211802]
Changes with Li extraction in the crystal Structure and electronic structure of monoclinic LiMnO2 have been investigated by first-principle calculations using spin-polarized generalized gradient approximation method. It is found that the Li extraction has changed the oxidation state of Mn ion from 3+ to 4+ and thereby induced a phase transition from the monoclinic structure to rhombohedral symmetry, which opens channels for the migration of Mn ions from their own octahedral sites to the interlayer Li vacancies. It is the migration of Mn ions that responds for the phase transition to a spinel-like structure and the severe capacity loss during the electrochemical cycles of monoclinic LiMnO2. (C) 2008 Elsevier Masson SAS. All rights reserved.
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