期刊
JOURNAL OF POWER SOURCES
卷 258, 期 -, 页码 356-364出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2014.02.060
关键词
Li-ion battery; Time-of-flight neutron diffraction; In-situ studies; Li-intercalation phase; Lithium iron phosphate; Vanadium-addition
资金
- RFBR [12-02-92200-Mong-a, 12-02-00686-a]
- JINR [13-401-01]
Neutron diffraction has been used for in-situ studying of the charge discharge processes in commercial lithium batteries with LiFePO4 (LFP) and graphite electrodes. The diffraction data were obtained with time-of-flight diffractometer in the process of three complete charge discharge cycles performed at a low rate (0.1 C) at room temperature. The experimental data allowed detailed tracing of the multistage process of Li insertion into graphite followed by the formation of several LiCn phases, as well as the reversible transition of LiFePO4 <-> FePO4. A comparison of the charge discharge processes in a battery with a pure LFP cathode and LFP containing similar to 1% of vanadium (LFPV) is made. In the second case, an evidently larger part of the anode material passes into the final LiC6 state. Analysis of the diffraction patterns of LFP and LFPV powders revealed a marked shrinkage of crystallite size in the LFPV case, which correlates with better electrochemical properties of LFPV compared to LFP. (C) 2014 Elsevier B.V. All rights reserved.
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