期刊
JOURNAL OF POWER SOURCES
卷 282, 期 -, 页码 235-240出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2015.02.008
关键词
Li-ion battery; Low-temperature performance; In operando studies; Neutron powder diffraction; Capacity reduction
资金
- Deutsche Forschungsgemeinschaft
Safety issues along with the substantially reduced energy and power capabilities of Li-ion cells, operated at low temperatures, pose a technical barrier limiting their use in electric vehicles and aerospace applications. A combined in situ high-resolution neutron powder diffraction and electrochemical study on Li-ion cells of the 18650-type over a temperature range from 230 K to 320 K is reported with a focus on the graphite anode and the low temperature performance of the cell. Instead of a quasi-continuous behavior as observed at ambient temperatures, an anomalous behavior occurs upon discharge at low temperature, primarily reflected in the abrupt character of the LiC12 - to - graphite phase transformation and the unusual temperature dependence of the amount of LiC6. An instability of lithiated graphite phases at temperatures below 250 K is observed, which affects the performance of Li-ion batteries at low temperatures. (C) 2015 Elsevier B.V. All rights reserved.
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