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Citation: 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[J]. Acta Physico-Chimica Sinica, ;2002, 18(08): 705-709. doi: 10.3866/PKU.WHXB20020807 shu

Determination of the Li＋ Diffusion Coefficient in Graphite By the Method of the Ratio of Potentio-charge Capacity to Galvano-charge Capacity

1.
College of Chemistry and Chemical Engineering, Hunan University, Changsha　410082;Institute of Applied Chemistry, Xinjiang University, Wulumuqi　820046

Received Date: 5 December 2001
Available Online: 15 August 2002

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 od 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.
- Ratio of potentio-charge capacity to galvano-charge capacity;　 Diffusion coefficient;Graphite;Lithium-ion batteries
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沈阳化工大学材料科学与工程学院沈阳 110142

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