Electrochemical performance and kinetics of LiFePO4/C cathode in a low-temperature electrolyte

Jingwen Yao; Feng Wu; Borong Wu; Xinping Qiu; Chunwei Yang; Ning Li

doi:10.3390/wevj4020396

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World Electric Vehicle Journal is published by MDPI from Volume 9 issue 1 (2018). Previous articles were published by The World Electric Vehicle Association (WEVA) and its member the European Association for e-Mobility (AVERE), the Electric Drive Transportation Association (EDTA), and the Electric Vehicle Association of Asia Pacific (EVAAP). They are hosted by MDPI on mdpi.com as a courtesy and upon agreement with AVERE.

Article

25 June 2010

Electrochemical performance and kinetics of LiFePO₄/C cathode in a low-temperature electrolyte

and

Department of Chemistry, Tsinghua University, Beijing 100084, China

School of Chemical Engineering & the Environment, Beijing Institute of Technology, Beijing 100081, China

National Development Center of High Technology Green Materials, Beijing 100081, China

Author to whom correspondence should be addressed.

World Electr. Veh. J.2010, 4(2), 396-399;https://doi.org/10.3390/wevj4020396

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Abstract

The electrochemical performance of LiFePO₄/C cathode in a carbonate-based electrolyte (1.0M LiPF₆/EC-DMC-PC-FEC) was tested in coin type cells at low temperatures. The discharge capacities of the LiFePO₄/C cathode were about 161.6mAh/g (20℃), 141.4mAh/g (-10℃) and 112.9mAh/g (-20℃) at 0.1C charge-discharge rate. The electrode kinetics of LiFePO4/C cathode was determined at different temperatures using cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The analyses demonstrate that the sluggish of charge-transfer reaction on the LiFePO₄/C-electrolyte interface and the dramatic decrease in lithium ion diffusivity in the bulk LiFePO₄/C material were the key performance limiting factors at low temperature.

Keywords:

LiFePO₄/C cathode; Lithium ion batteries; Low-temperature electrolyte; Fluoroethylene carbonate

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