Journal
ELECTROCHEMISTRY COMMUNICATIONS
Volume 10, Issue 5, Pages 691-694Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.elecom.2008.02.017
Keywords
low-temperature performance; LiFePO4/C cathode; quaternary carbonate-based electrolyte; lithium ion batteries
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The low-temperature performance of LiFePO4/C cathode in a quaternary carbonate-based electrolyte (1.0 M LiPF6/EC+DMC+DEC+EMC (1: 1: 1:3, v/v)) was studied. The discharge capacities of the LiFePO4/C cathode were about 134.5 mAh/g (20 degrees C), 114 mAh/g (0 degrees C), 90 mAh/g (-20 degrees C) and 69 mAh/g (-40 degrees C) using a 1C charge-discharge rate. Cyclic voltammetry measurements show obviously sluggish of the lithium insertion-extraction process of the LiFePO4/C cathode as the operation temperature falls below -20 degrees C. Electrochemical impedance analyses demonstrate that the sluggish of charge-transfer reaction on the electrolyte/LiFePO4/C interface and the decrease of lithium diffusion capability in the bulk LiFePO4 was the main performance limiting factors at low-temperature. (C) 2008 Elsevier B.V. All rights reserved.
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