本视频主要关于GITT的测试和计算的一些注意事项,欢迎大家讨论:
GITT测试的电流要足够小(小于0.1 C)和脉冲时间(小于10 min)要足够短,可以作图通过√t~ΔE的是否满足线性关系进行判断合理性
GITT公式里面的S是电极与电解质的接触面积(m2),建议用BET的比表面积(m2/g)乘质量(g)获得
常规的GITT不适用于具有明显平台的电极材料(如LiFePO4,TiO2,石墨,MnO2等),建议通过PITT测试或者修正的GITT(如VR-GITT)获得扩散系数
本视频的参考文献如下:1. Re-understanding the galvanostatic intermittent titration technique: Pitfalls in evaluation of diffusion coefficients and rational suggestions 2. Galvanostatic Intermittent Titration Technique for Phase-Transformation Electrodes 3. Least Squares Galvanostatic Intermittent Titration Technique
(LS-GITT) for Accurate Solid Phase Diffusivity Measurement 4. Voltage-Relaxation GITT and Reverse Monte Carlo to Determine Lithium Diffusion and Distribution in TiO2 and Highly-Ordered Nanoporous Hard Carbons 5. Ultrafast Zinc-Ion Diffusion Ability Observed in 6.0-Nanometer Spinel Nanodots