科研之友
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摘要
The discharge kinetics of phase transformation electrodes for Li-ion batteries were investigated by developing a mathematical model based on mixed-mode phase transformation, by assuming that the phase transformation is controlled by both Li chemical diffusion and interface mobility. The discharge model was validated by matching the model discharge curves with the experimental discharge curves of two LiFePO4 samples at different current densities. With the validated model as a tool, effects of phase transformation, chemical diffusion, and solid solution range on rate capability were determined and analyzed. The high rate performance of LiFePO4 was well explained by using this model. The model developed here is applicable for any ion insertion electrode with a phase transformation, such as Li4Ti5O12 in Li-ion battery and metal-hydride electrodes in Ni/MH batteries.
- 出版日期2007-11-8
