引用本文:
唐致远, 薛建军, 刘春燕, 庄新国. 锂离子在石墨负极材料中扩散系数的测定[J]. 物理化学学报,
2001, 17(05): 385-388.
doi:
10.3866/PKU.WHXB20010501
Citation: Tang Zhi-Yuan, Xue Jian-Jun, Liu Chun-Yan, Zhuang Xin-Guo. Determination of the Lithium Ion Diffusion Coefficient in Graphite Anode Material[J]. Acta Physico-Chimica Sinica, 2001, 17(05): 385-388. doi: 10.3866/PKU.WHXB20010501
Citation: Tang Zhi-Yuan, Xue Jian-Jun, Liu Chun-Yan, Zhuang Xin-Guo. Determination of the Lithium Ion Diffusion Coefficient in Graphite Anode Material[J]. Acta Physico-Chimica Sinica, 2001, 17(05): 385-388. doi: 10.3866/PKU.WHXB20010501
锂离子在石墨负极材料中扩散系数的测定
English
Determination of the Lithium Ion Diffusion Coefficient in Graphite Anode Material
Abstract:
Two expressions are introduced to calculate the lithium ion diffusion coefficients in graphite anode as a function of potentials when potentiostatic intermittent titration technique(PITT) is used. The lithium ion diffusion coefficients in graphite derived from effective surface area, which is measured by electrochemical method, are more reliable than those derived simply from radius of graphite particles(calculated from equation (3) and equation (2) respectively). The curves of dQ/dE vs E demonstrate that there are three reversible phase transitions during intercalation or deintercalation of lithium ion in graphite. In the vicinity of the potentials where phase transitions take place, the lithium ion diffusion coefficients in graphite material have three minima in the potential range 10～600 mV.
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