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

Title
The Root Cause of the Rate Performance Improvement After Metal Doping: A Case Study of LiFePO4
Authors
박창규박성빈박지훈신호철조원일장호
Keywords
LiFePO4; Doping; rate performance; XPS; binding energy
Issue Date
2011-03
Publisher
Bulletin of the Korean Chemical Society
Citation
VOL 32, NO 3, 921-926
Abstract
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 diffusivity.
URI
http://pubs.kist.re.kr/handle/201004/39506
ISSN
0253-2964
Appears in Collections:
KIST Publication > Article
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