期刊
ELECTROCHIMICA ACTA
卷 227, 期 -, 页码 24-32出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2017.01.005
关键词
Tripropyl borate; electrolyte additive; interfacial stability; elevated temperature
资金
- National Natural Science Foundation of China [21573080]
- Natural Science Foundation of Guangdong Province [2014A030313424]
- Joint Project of the National Natural Science Foundation of China
- Natural Science Foundation of Guangdong [U1401248]
- Guangzhou City Project for Cooperation among Industries, Universities and Institutes [201509030005]
- scientific research project of Department of Education of Guangdong Province [2013CXZDA013]
A simple boron -containing molecule, tripropyl borate (TPB), is used as an electrolyte additive to stabilize the interface between spinel lithium manganese oxide (LiMn2O4) and carbonate -based electrolyte under elevated temperature. Electrochemical measurements indicate that the cyclic stability of LiMn2O4 electrode can be significantly improved by TPB. The capacity retention of LiMn2O4 at 1C after 200 cycles under 55 degrees C is improved from 47% to 74% by adding 3% TPB into a standard electrolyte (1.0 mol L-1 LiPF6-EC/EMC/DEC (3/5/2, in weight)). Most importantly, the self-discharge of LiMn2O4 under 55 degrees C, which takes place dramatically in the standard electrolyte, is effectively suppressed in 3% TPB-containing electrolyte. Theoretical calculations and physical characterizations demonstrate that a protective cathode electrolyte interface (CEI) film is formed on LiMn2O4 from the preferential oxidation of TPB, which suppresses the oxidation decomposition of the standard electrolyte. Due to the incorporation of boron, the CEI film formed from TPB is beneficial to the rate capability of LiMn2O4. (C) 2017 Elsevier Ltd. All rights reserved.
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