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   

  1. College of Chemistry & Chemical Engineering, Central South University, Changsha 410083, P. R. China
  • Received:2006-07-31 Revised:2006-09-12 Published:2007-01-08
  • Contact: HUANG Ke-Long E-mail:klhuang@mail.csu.edu.cn

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 words: Aqueous lithium-ion battery, LiFePO4, Cyclic voltammetry, Potentiostatic intermittent titration technique, Diffusion coefficient