Journal
JOURNAL OF POWER SOURCES
Volume 324, Issue -, Pages 704-711Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2016.06.008
Keywords
Sulfolane-based electrolyte; Electrolyte additives; Vinylene carbonate; Tri-allyl phosphate; High voltage Li-ion cells
Funding
- NSERC
- 3M Canada under Industrial Research Chairs program
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An electrolyte mixture containing 1 M LiPF6 in sulfolane:ethylmethyl carbonate 3:7 with vinylene carbonate and other electrolyte additives exhibited promising cycling and storage performance in high voltage Li(Ni0.4Mn0.4CO0.2)O-2/graphite pouch type Li-ion cells tested to 4.5 V. Voltage drop during storage, coulombic efficiency, charge endpoint capacity slippage during ultra high precision cycling, charge-transfer resistance after storage or cycling, gas evolution during storage and cycling as well as capacity retention during long-term cycling were examined. The results for cells with sulfolane-based electrolytes were compared with those for cells with ethylene carbonate-based electrolytes containing state-of-the-art electrolyte additives. This survey showed that the combination of vinylene carbonate and triallyl phosphate as electrolyte additives in sulfolane:ethylmethyl carbonate electrolyte yielded cells capable of better performance during tests to 4.5 V than cells with ethylene carbonate-based electrolytes. These results suggest that sulfolane-based electrolytes may be promising for high voltage Li-ion cells. (C) 2016 Elsevier B.V. All rights reserved.
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