KCS Publications

HOME > Search > Browsing(BKCS) > Archives

Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 32, Number 3
BKCSDE 32(3)
March 20, 2011

Title	Li Ion Diffusivity and Improved Electrochemical Performances of the Carbon Coated LiFePO₄
Author	Chang Kyoo Park, Sung Bin Park, Si Hyung Oh, Ho Jang, Won Il Cho*
Keywords	Lithium iron phosphate, Carbon coating, Chemical diffusion coefficient, Cyclic voltammetry, Electrochemical impedance spectroscopy
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 cm2 s⁻¹, respectively, indicating considerable increases in diffusivity after modifications. The Li ion diffusivity (D_Li) 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.
Page	836 - 840
Full Text	PDF

How to access to the WOL for The Bulletin of the Korean Chemical Society ?

The Bulletin of the Korean Chemical Society will be co-published with Wiley-VCH from 2015 towards. The online version of the Journal will thus be available on Wiley Online Library, Wiley(-VCH)'s global online platform.

KCS members can get a free online access to the Bulletin of the Korean Chemical Society in WOL.

Free Access to WOL