Journal
JOURNAL OF POWER SOURCES
Volume 293, Issue -, Pages 71-77Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2015.05.070
Keywords
Lithium nickel manganese oxide cathode; High voltage lithium ion batteries; Interfacial stability; Phenyl trifluoromethyl sulfide; Electrolyte additive
Funding
- National Natural Science Foundation of China [21303061]
- Joint Project of the National Natural Science Foundation of China
- Natural Science Foundation of Guangdong [U1134002]
- Natural Science Foundation of Guangdong Province [2014A030313424]
- key project of Science and Technology in Guangdong Province [2012A010702003]
- Joint Project of Guangdong Province and Ministry of Education for the Cooperation among Industries, Universities and Institutes [2012B091100332]
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In this work, we propose a novel electrolyte additive phenyl trifluoromethyl sulfide (PTS) to improve the interfacial stability of high voltage lithium nickel manganese oxide (LiMn1.5Ni0.5O4) cathode/electrolyte. At 1C rate, addition of 0.5% PTS improves the capacity retention of LiMn1.5Ni0.5O4 from 65% to 84% after 450 cycles at room temperature, and from 64% to 95% after 100 cycles at evaluate temperature. Density functional theory calculation and experimental characterization demonstrate that PTS oxidizes preferentially to the carbonate base electrolyte, generating a SEI film, which effectively suppresses the continuous decomposition of carbonate base electrolyte and the structural destruction of LiMn1.5Ni0.5O4. (C) 2015 Elsevier B.V. All rights reserved.
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