锂离子在石墨负极材料中扩散系数的测定  

Determination of the Lithium Ion Diffusion Coefficient in Graphite Anode Material

作　　者：唐致远[1] 薛建军[1] 刘春燕[1] 庄新国[1] 

机构地区：[1]天津大学化工学院,天津300072

出　　处：《物理化学学报》2001年第5期385-388,共4页Acta Physico-Chimica Sinica

基　　金：天津市自然科学基金资助项目&&

摘　　要：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.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 d Q/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 similar to 600 mV.

关 键 词：扩散系数 石墨 锂离子电池 嵌入电极 负极材料 锂离子 测定 

分 类 号：TM911[电气工程—电力电子与电力传动]