Journal
JOURNAL OF POWER SOURCES
Volume 334, Issue -, Pages 58-64Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2016.10.009
Keywords
Electrolyte; Fluorosilane; High voltage; Thermal stability; Lithium-ion batteries
Funding
- K. C. Wong Education Foundation, Guangdong Provincial Project for Science Technology [2014A050503050/2015B010135008]
- Guangzhou Municipal Project for Science Technology [2014Y2-00012/201509010018]
- National Natural Science Foundation of China [21573239]
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Two fluorosilanes with oligo(ethylene oxide) unites were synthesized through hydrosilylation of chlorosilane with allyl substituted oligo(ethylene oxide) ether followed by fluorination with potassium fluoride. The synthesized fluorosilane compounds exhibited lower viscosity, higher dielectric constant and higher oxidation potential, compared with their non-fluorination counterparts. Difluoro(3-(2-(2-methoxyethoxy)ethoxy)propyl)methylsilane (DFSM2), one of the two compounds, was evaluated as high-voltage and thermal stable electrolyte co-solvent with the conventional carbonate-based electrolytes. Using an optimized electrolyte of 1M LiPF6 in EC/DFSM2/EMC (2/3/5 in vol.) with addition of 5 wt% fluoroethylene carbonate (FEC), high-voltage LiCoO2(LCO)/graphite full cell displayed outstanding cycling stability of 92.5% capacity retention after 135 cycles at 4.4 V upper cutoff voltage. Characterized by differential scanning calorimetry (DSC) analysis, the DFSM2-based electrolyte demonstrated higher thermal stability with lithiated graphite anode and delithiated LCO cathode, thus better safety feature compared with the conventional electrolyte. (C) 2016 Elsevier B.V. All rights reserved.
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