期刊论文详细信息
Bulletin of the Korean chemical society
The Root Cause of the Rate Performance Improvement After Metal Doping: A Case Study of LiFePO4
SungBin Park1  WonIl. Cho1  Ho Jang1  HoChul Shin1  ChangKyoo Park1  JiHun Park1 
关键词: LiFePO4;    Doping;    Rate performance;    XPS;    Binding energy;   
DOI  :  
学科分类:化学(综合)
来源: Korean Chemical Society
PDF
【 摘 要 】

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.

【 授权许可】

Unknown   

【 预 览 】
附件列表
Files Size Format View
RO201912010242845ZK.pdf 4354KB PDF download
  文献评价指标  
  下载次数:15次 浏览次数:31次