期刊
JOURNAL OF POWER SOURCES
卷 244, 期 -, 页码 716-720出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2012.11.084
关键词
Fluorosulphate; Cathode material; Lithium ion batteries; Cation mixing
资金
- Hi-tech Research and Development Program of China [2009AA033101]
- Assistant Secretary for Energy Efficiency and Renewable Energy, Office of Vehicle Technologies of the U.S. DOE [DE-AC02-98CH10886]
- U.S. DOE
Monoclinic phase LiFeSO4F has a triplite like structure in which Li+/Fe2+ is fully mixing. Not 100% Li can be extracted from the lattice easily even at a rate of C/20, and the valence of Fe changes between ca +2 and +2.5 observed by XANES for a Li/LiFeSO4F cell cycled between 2.2 and 4.6 V. Two-phase reaction mechanism is verified by GITT due to the appearance of a flat plateau, and large polarization appears after more than 50% Li extracted from triplite-LiFeSO4F. A core shell model has been mentioned to explain its extreme polarization. In the fully mixing structure, there is no intact long-range pathway for Li+, so leading to sluggish kinetics effect and inert Li+ in the lattice. (C) 2012 Elsevier B.V. All rights reserved.
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