Journal
JOURNAL OF POWER SOURCES
Volume 328, Issue -, Pages 124-135Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2016.08.015
Keywords
Linear alkyl carbonates; EC-free electrolytes; High voltage Li-ion cells; Passivating additives; Ethyl methyl carbonate plus fluoroethylene carbonate
Funding
- NSERC
- 3M Canada under the auspices of the Industrial Research Chairs program
- Walter C. Sumner Foundation
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Some of the problems of current electrolytes for high voltage Li-ion cells originate from ethylene carbonate (EC) which is thought to be an essential electrolyte component for Li-ion cells. Ethylene carbonate-free electrolytes containing 1 M LiPF6 in ethylmethyl carbonate (EMC) with small loadings of vinylene carbonate, fluoroethylene carbonate, or (4R,5S)-4,5-Difluoro-1,3-dioxolan-2-one acting as enablers were developed. These electrolytes used in Li(Ni0.4Mn0.4Co0.2)O(2)(/)graphite pouch type Li-ion cells tested at 4.2 V and 4.5 V yielded excellent charge-discharge cycling and storage properties. The results for cells containing linear alkyl carbonate electrolytes with no EC were compared to those of cells with EC-containing electrolytes incorporating additives proven to enhance cyclability of cells. The combination of EMC with appropriate amounts of these enablers yields cells with better performance than cells with EC-containing electrolytes incorporating additives tested to 4.5 V. Further optimizing these linear alkyl carbonate electrolytes with appropriate co-additives may represent a viable path to the successful commercial utilization of NMC/graphite Li-ion cells operated to 4.5 V and above. (C) 2016 Elsevier B.V. All rights reserved.
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