Li Ion Diffusivity and Improved Electrochemical Performances of the Carbon Coated LiFePO4

Title
Li Ion Diffusivity and Improved Electrochemical Performances of the Carbon Coated LiFePO4
Authors
박창규박성빈오시형장호조원일
Keywords
LiFePO4; carbon; coating; lithium ion diffusivity; cyclic voltammetry; EIS; Lithium iron phosphate; Chemical diffusion coefficient; Electrochemical impedance spectroscopy
Issue Date
2011-03
Publisher
Bulletin of the Korean Chemical Society
Citation
VOL 32, NO 3, 836-840
Abstract
This study examines the effects of a carbon coating on the electrochemical performances of LiFePO4. The results show that the capacity of bare LiFePO4 decreased sharply, whereas the LiFePO4/C shows a well maintained initial capacity. The Li ion diffusivity of the bare and carbon coated LiFePO4 is calculated using cyclic voltammetry (CV) to determine the correlation between the electrochemical performance of LiFePO4 and Li diffusion. The diffusion constants for LiFePO4 and LiFePO4/C measured from CV are 6.56 × 10−16 and 2.48 × 10−15 ㎠ s−1, respectively, indicating considerable increases in diffusivity after modifications. The Li ion diffusivity (DLi) values as a function of the lithium content in the cathode are estimated by electrochemical impedance spectroscopy (EIS). The effects of the carbon coating as well as the mechanisms for the improved electrochemical performances after modification are discussed based on the diffusivity data.
URI
http://pubs.kist.re.kr/handle/201004/39504
ISSN
0253-2964
Appears in Collections:
KIST Publication > Article
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