期刊
JOURNAL OF POWER SOURCES
卷 285, 期 -, 页码 360-366出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2015.03.113
关键词
Tris(trimethylsilyl)borate Layered lithium-rich oxide; Carbonate-based electrolyte; Additive; Cyclic performance; Interfacial stability
资金
- National Natural Science Foundation of China
- Natural Science Foundation of Guangdong Province [U1134002]
- National Natural Science Foundation [21273084]
- Key Project of Science and Technology in Guangdong Province [2013B090800013]
- Scientific Research Project of Department of Education of Guangdong Province [2013CXZDA013]
- Dongguan City Project for Industries, Universities and Institutes [2014509136101]
Tris(trimethylsilyl)borate (TMSB) is used as an electrolyte additive for high voltage lithium-rich oxide cathode of lithium ion battery. The interfacial natures of Li[Li0.2Mn0.54Ni0.13Co0.13]O-2/carbonate-based electrolyte are investigated with a combination of electrochemical measurements and physical characterizations. Charge/discharge tests show that the cyclic performance of Li[Li0.2Mn0.54Ni0.13Co0.13]O-2 in a mixed carbonate electrolyte is significantly improved by using TMSB. After 200 cycles between 2 V and 4.8 V (vs. Li/Li+) at 0.5 C rate, the capacity retention of Li[Li0.2Mn0.54Ni0.13Co0.13]O-2 is only 19% in the blank electrolyte, while it is improved to 74% when 0.5% TMSB is applied. The results from physical characterizations demonstrate that this excellent cyclic performance is attributed to the improved interfacial stability of Li[Li0.2Mn0.54Ni0.13Co0.13]O-2/electrolyte due to the thin and protective film generated by TMSB. (C) 2015 Elsevier B.V. All rights reserved.
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