Journal
SOLID STATE IONICS
Volume 254, Issue -, Pages 27-31Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ssi.2013.10.047
Keywords
Low-temperature performance; Butyl sultone; Electrolyte additive; Lithium-ion battery
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Funding
- Fundamental Research Funds for the Central Universities [DL12BB06]
- National High Technology Research and Development Program (863 Program) of China [2012AA110203]
- Science and Technology Innovation Talent Research Special Funds of Harbin in China [RC2013XK018002]
- Introduce Talents project of Harbin Institute of Technology [01507048]
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Low-temperature performance of a LiFePO4 electrode is successfully and easily improved by adding butyl sultone (BS) in 1 mol L-1 LiPF6-ethylene carbonate (EC)/propylene carbonate (PC)/ethyl methyl carbonate (EMC) (1:1:3 vol.%) electrolyte. Through BS addition, discharge capacity and rate performance at low temperature are obviously enhanced. The surface morphology and chemical composition of the solid electrolyte interphase (SEI) formed on the surface of the LiFePO4 electrode are studied through scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS) analysis, and combined with the electrochemical impedance spectrum (EIS) analysis, the improved low-temperature performance is attributed to participating in the formation of a thinner SEI film, which enhances the ion conductivity of the SEI film and accelerates the migration of lithium ions through the SE! film. (C) 2013 Published by Elsevier B.V.
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