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Title of Journal: J Cent South Univ

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Abbravation: Journal of Central South University

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Central South University

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10.1007/s40278-013-7008-8

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2227-5223

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Effects of temperature variation on LiSubscript

Authors: Zhengwei Xiao Yingjie Zhang Guorong Hu
Publish Date: 2015/06/12
Volume: 22, Issue: 6, Pages: 2043-2051
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Abstract

LiFePO4/C was prepared via solid state reaction and characterized with Xray powder diffraction and charge–discharge test Asprepared LiFePO4/C has a triphylite structure and exhibits an excellent rate capability and capacity retention Electrochemical impedance spectroscopy EIS was applied to investigate Li x FePO4/C 0x1 electrode on temperature variation The valid equivalent circuit for EIS fitting was determined which contains an intercalation capacitance for Li+ ion accumulation and consumption in the electrode reaction The surface layer impedance needs to be included in the equivalent circuit when LiFePO4/C is deeply delithiated at a relatively high temperature EIS examination indicates that a temperature rise leads to a better reversibility lower charge transfer resistance higher exchange current density J0 and greater Li+ ion diffusion coefficient for the Li x FePO4/C electrode process The Li+ ion concentration in Li x FePO4/C is potential to impact the Li+ ion diffusion coefficient and a decrease in the former results in an increase in the latterFoundation item Project2010ZC051 supported by the Natural Science Foundation of Yunnan Province China Project20140439 supported by Analysis and Testing Foundation from Kunming University of Science and Technology China Project14118245 supported by Starting Research Fund from Kunming University of Science and Technology China

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