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Acta Phys. -Chim. Sin.  2007, Vol. 23 Issue (01): 129-133    DOI: 10.3866/PKU.WHXB20070127
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Kinetics of Electrode Processes of LiFePO4 in Saturated Lithium Nitrate Solution
HUANG Ke-Long;YANG Sai;LIU Su-Qin;WANG Hai-Bo
College of Chemistry & Chemical Engineering, Central South University, Changsha 410083, P. R. China
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Abstract  Kinetics of electrode processes of LiFePO4 in saturated LiNO3 solution was investigated by analyses of cyclic voltammetry (CV), charge/discharge test, and potentiostatic intermittent titration (PITT). The results showed that LiFePO4 had good electrochemical reversibility in saturated LiNO3 solution. The first discharge capacity was about 116.2 mAh•g−1, and its charge/discharge efficiency was 92%. The lithium diffusion coefficients, corresponding to anodic peak and cathodic peak in LiFePO4, obtained from CV were 4.3×10−11 cm2•s−1 and 3.8×10−11 cm2•s−1. The lithium diffusion coefficients obtained from PITT varied with potentials, and the lowest value was about 5.5×10−11 cm2•s−1, coinciding with the voltage plateau region in the charge curves.

Key wordsAqueous lithium-ion battery      LiFePO4      Cyclic voltammetry      Potentiostatic intermittent titration technique      Diffusion coefficient     
Received: 31 July 2006      Published: 08 January 2007
Corresponding Authors: HUANG Ke-Long     E-mail: klhuang@mail.csu.edu.cn
Cite this article:

HUANG Ke-Long;YANG Sai;LIU Su-Qin;WANG Hai-Bo. Kinetics of Electrode Processes of LiFePO4 in Saturated Lithium Nitrate Solution. Acta Phys. -Chim. Sin., 2007, 23(01): 129-133.

URL:

http://www.whxb.pku.edu.cn/10.3866/PKU.WHXB20070127     OR     http://www.whxb.pku.edu.cn/Y2007/V23/I01/129

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