期刊
JOURNAL OF POWER SOURCES
卷 189, 期 1, 页码 798-801出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2008.07.073
关键词
First-principles calculation; Lithium manganese oxide; Crystallographic structure; Redox potential; Charge compensation
A systematic first-principles calculation based on density functional theory is carried out to discuss the redox mechanism of Li2MnO3. The lattices of structural models having C2/m- and C2/c-type stacking sequences can be regarded as hexagonal, while their symmetry is monoclinic. Different stacking sequences of [Mn2/3Li1/3] layers do not cause differences in the energy or crystallographic structure, suggesting a disordered stacking sequence. A calculation for Li2-xMnO3 assuming topotactic lithium removal indicates that lithium removal can occur at a potential of about 4.6 V with a wide potential plateau. The electronic structure of Li2-xMnO3 shows that the manganese ions remain in the charge state of Mn4+ and the charge of the removed lithium ions is compensated by the oxidation of oxygen. (C) 2008 Elsevier B.V. All rights reserved.
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