Kinetics of Li+ transport and capacity retention capability of HT-LiCoO2 films
In this work, HT-LiCoO2 films with preferential c-axis orientation were prepared using pulsed laser deposition. The kinetics of lithium ion transport through the HT-LiCoO2 film was investigated by applying potentiostatic intermittent titration technique (PITT). The capacity retention capability of the HT-LiCoO2 film was studied using constant-current (CC) cycling. PITT measurement showed that the lithium chemical diffusion coefficient (DLi+) of the HT-LiCoO2 films reached as high as 10-8-10-10cm2s-1 and the value of DLi+ in the two-phase coexistence region was lower than that in other single-phase regions. CC cycling revealed that the HT-LiCoO2 film delivered an initial discharge capacity of 40μAhμm-1cm-2 and the discharge capacity decreased to 22.4μAhμm-1cm-2 after 100 CC cycles. The observation was found to be caused by the continuous formation of the spinel phase (LiCo2O4 or Co3O4).
Y Zhang Z G Lu C Y Chung M Zhu
School of Mechanical Engineering, South China University of Technology, Guangzhou, 510640, Peoples Department of Physics and Materials Science, City University of Hong Kong, Hong Kong, Peoples Repub
国际会议
第二届功能原料国际研讨会(The 2rd International Symposium on Functional Materials)
杭州
英文
38-42
2007-05-16（万方平台首次上网日期，不代表论文的发表时间）