Li ion diffusivity and improved electrochemical performances of the carbon coated LiFePO4

Chang Kyoo Park; Sung Bin Park; Si Hyung Oh; Ho Jang; Won Il Cho

doi:10.5012/bkcs.2011.32.3.836

Li ion diffusivity and improved electrochemical performances of the carbon coated LiFePO₄

Chang Kyoo Park
, Sung Bin Park
, Si Hyung Oh
, Ho Jang
, Won Il Cho

Dept. of Materials Science & Engineering

Research output: Contribution to journal › Article › peer-review

51 Scopus citations

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 LiFePO ₄ 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 (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.

Original language	English
Pages (from-to)	836-840
Number of pages	5
Journal	Bulletin of the Korean Chemical Society
Volume	32
Issue number	3
DOIs	https://doi.org/10.5012/bkcs.2011.32.3.836
State	Published - 20 Mar 2011

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

SDG 7 Affordable and Clean Energy

Keywords

Carbon coating
Chemical diffusion coefficient
Cyclic voltammetry
Electrochemical impedance spectroscopy
Lithium iron phosphate

Access to Document

10.5012/bkcs.2011.32.3.836

Cite this

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title = "Li ion diffusivity and improved electrochemical performances of the carbon coated LiFePO4",

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 LiFePO 4 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 (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.",

keywords = "Carbon coating, Chemical diffusion coefficient, Cyclic voltammetry, Electrochemical impedance spectroscopy, Lithium iron phosphate",

author = "Park, \{Chang Kyoo\} and Park, \{Sung Bin\} and Oh, \{Si Hyung\} and Ho Jang and Cho, \{Won Il\}",

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T1 - Li ion diffusivity and improved electrochemical performances of the carbon coated LiFePO4

AU - Park, Chang Kyoo

AU - Park, Sung Bin

AU - Oh, Si Hyung

AU - Jang, Ho

AU - Cho, Won Il

PY - 2011/3/20

Y1 - 2011/3/20

N2 - 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 LiFePO 4 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 (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.

AB - 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 LiFePO 4 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 (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.

KW - Carbon coating

KW - Chemical diffusion coefficient

KW - Cyclic voltammetry

KW - Electrochemical impedance spectroscopy

KW - Lithium iron phosphate

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