Journal
ELECTROCHIMICA ACTA
Volume 91, Issue -, Pages 282-292Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2013.01.011
Keywords
Lithium-ion battery; Lithium difluoro(oxalato)borate; Sulfolane; Sulfite
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Funding
- Science and Technology Planning Project of Gansu Province [110RJYA056]
- Scientific Research & Development Fund of Lanzhou University of Technology [SB05200903]
- Branchy Tamarisk Development Program for Young Teachers of Lanzhou University of Technology [Q201105]
- Natural Science Foundation of China [20961004, 51002164]
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Lithium difluoro(oxalato)borate (LiODFB) (99.5%, by weight) is synthesized by an improved method, with the co-product of LiBF4 (99.5%, by weight). The electrochemical behaviors of sulfolane (SL) with LiODFB are studied by employment dimethyl sulfite (DMS) as a mixed solvent. It shows that 0.9 mol L-1 LiODFB-SL/DMS (1:1, by volume) electrolyte has considered stability against oxidative decomposition (>5.5 V) and satisfactory conductivity. Electrochemical reductions of SL and DMS would occur nearly at the same level of ODFB anions. Further studies show that SL is the main and key reason during the formation process of an excellent solid electrolyte interphase (SEI) layer. When used in Li/MCMB cells, 0.9 mol L-1 LiODFB-SL/DMS electrolyte exhibits not only excellent film-forming characteristics, but also stable cycle performance. Besides, when used in LiFePO4/Li cells, 0.9 mol L-1 LiODFB-SL/DMS electrolyte exhibits several advantages, for example, the more stable electrochemical performances even at elevated and relatively low temperatures. Crown Copyright (C) 2013 Published by Elsevier Ltd. All rights reserved.
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