Acta Phys. -Chim. Sin. ›› 2004, Vol. 20 ›› Issue (04): 377-381.doi: 10.3866/PKU.WHXB20040409

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Chemical Diffusion Behaviors of Lithium-ion in the LiV3O8 Prepared by Wet Method Reaction

Liu En-Hui;Li Xin-Hai;Hou Zhao-Hui;He Ze-Qiang;Deng Ling-Feng   

  1. School of Metallurgical Science and Engineering, Central South University, Changsha　410083
  • Received:2003-10-06 Revised:2003-11-28 Published:2004-04-15
  • Contact: Liu En-Hui E-mail:liuenhui99@sina.com.cn

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Abstract: LiV3O8 as a cathode material for lithium ion batteries was synthesized by solution reaction and low temperature calcinations technique with V2O5•nH2O hydro-gels and Li2CO3 as raw materials. The precursor and product were characterized by DTA-TG, XRD measurements. Electrochemical behavior of the LiV3O8 as a cathode material for rechargeable lithium-ion batteries was studied by galvanostatic charge-discharge measurement. The experiment showed that the active material LiV3O8 was of higher charge-discharge capacity and excellent cycling behavior. Lithium-ion chemical diffusion coefficient (DLi＋) of the LiV3O8 electrode was determined by the potentiostatic intermittent titration technique (PITT).DLi＋ values obtained were in the range of 10－8～10－10 cm2•s－1,depending on x-values in Li1＋xV3O8.The activation energy of lithium-ion diffusion (Ea) obtained was in the range of 25～42 kJ•mol－1(x=0.18～2.5).

Key words: Lithium trivanadate, Wet method reaction, Diffusion, Activation energy, 　Lithium-ion battery