Journal
ELECTROCHIMICA ACTA
Volume 49, Issue 27, Pages 4857-4863Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2004.05.038
Keywords
ionic conductivity; low temperature; multi-component electrolyte; Li-ion batteries; discharge performance
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The ionic conductivities of EC-based multi-component electrolytes in various solvent compositions were measured over a wide temperature range of +40 to -40 degreesC, and the factors affecting the low temperature conductivities of the electrolytes were discussed. It is revealed from the experimental results that the co-solvents with high dielectric constant and low viscosity can improve the ionic conductivity at room temperature, whereas, only the co-solvents which possess low melting points can effectively expand the operating temperature range of the electrolyte. The Li-ion batteries using the optimized electrolyte of 1 M LiPF6/EC-DMC-EMC (8.3:25:66.7) show the capacity retentions about 90.3% of their nominal capacities when discharged to 2.0 V at -40 degreesC at 0.1 C, demonstrating excellent low temperature performances. (C) 2004 Elsevier Ltd. All rights reserved.
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