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This study investigates a root cause of the improved rate performance of after metal doping to Fesites. This is because the metal doped /C maintains its initial capacity at higher C-rates than undoped one. Using /C and doped /C (M=, , ), which are synthesized by a mechanochemical process followed by one-step heat treatment, the Li content before and after chemical delithiation in the /C and the binding energy are compared using atomic absorption spectroscopy (AAS) and X-ray photoelectron spectroscopy (XPS). The results from AAS and XPS indicate that the low Li content of the metal doped /C after chemical delithiation is attributed to the low binding energy induced by weak Li-O interactions. The improved capacity retention of the doped /C at high discharge rates is, therefore, achieved by relatively low binding energy between Li and O ions, which leads to fast Li diffusivity.

The Root Cause of the Rate Performance Improvement After Metal Doping: A Case Study of LiFePO4

The Root Cause of the Rate Performance Improvement After Metal Doping: A Case Study of LiFePO₄