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Acta Physico-Chimica Sinica  2002, Vol. 18 Issue (08): 705-709    DOI: 10.3866/PKU.WHXB20020807
Article     
Determination of the Li+ Diffusion Coefficient in Graphite By the Method of the Ratio of Potentio-charge Capacity to Galvano-charge Capacity
Tang Xin-Cun;He Li-Ping;Chen Zong-Zhang;Xia Xi
College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082;Institute of Applied Chemistry, Xinjiang University, Wulumuqi 820046
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Abstract  A novel electrochemical method (RPG method) has been theoretically and experimentally developed to determine the diffusion coefficient of intercalary species within insertion-host materials on the basis of the spherical diffusion model. Theoretical results show that the diffusion coefficient D is dependent to the ratio (q) of the potentio-charge capacity to the galvano-charge capacity (abridged as RPG), the radius of insertion-host particle R, and the galvano-charge time tG. The RPG equation obtained is as D=R2/(15.36qtG)(q ≤ 0.5).Using this method, the values of the Li+ diffusion coefficient determined at different galvano-charge currents with 1.5 V cutoff voltage are all around the value of 1.060×10-10 cm2•s-1.This result indicates that the RPG method has a good reliability for determination of the diffusion coefficient. The Li+ diffusion coefficient in graphite has been reduced from 4.292×10-10 to 1.219×10-11 cm2•s-1 among the voltage range of 1.0~2.5 V (vs Li/Li+),respectively.

Key wordsRatio of potentio-charge capacity to galvano-charge capacity        Diffusion coefficient      Graphite      Lithium-ion batteries     
Received: 05 December 2001      Published: 15 August 2002
Corresponding Authors: Chen Zong-Zhang     E-mail: tangxincun@sina.com.cn
Cite this article:

Tang Xin-Cun;He Li-Ping;Chen Zong-Zhang;Xia Xi. Determination of the Li+ Diffusion Coefficient in Graphite By the Method of the Ratio of Potentio-charge Capacity to Galvano-charge Capacity. Acta Physico-Chimica Sinica, 2002, 18(08): 705-709.

URL:

http://www.whxb.pku.edu.cn/Jwk_wk/wlhx/10.3866/PKU.WHXB20020807     OR     http://www.whxb.pku.edu.cn/Jwk_wk/wlhx/Y2002/V18/I08/705

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