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
- 박창규; 박성빈; 박지훈; 신호철; 조원일; 장호
- LiFePO4; Doping; rate performance; XPS; binding energy
- Issue Date
- Bulletin of the Korean Chemical Society
- VOL 32, NO 3, 921-926
- This study investigates a root cause of the improved rate performance of LiFePO4 after metal doping to Fesites.
This is because the metal doped LiFePO4/C maintains its initial capacity at higher C-rates than undoped
one. Using LiFePO4/C and doped LiFe0.97M0.03PO4/C (M=Al3+, Cr3+, Zr4+), which are synthesized by a
mechanochemical process followed by one-step heat treatment, the Li content before and after chemical
delithiation in the LiFePO4/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 LiFePO4/C after chemical delithiation is attributed to the low binding energy
induced by weak Li-O interactions. The improved capacity retention of the doped LiFePO4/C at high discharge
rates is, therefore, achieved by relatively low binding energy between Li and O ions, which leads to fast Li
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