Li Ion Diffusivity and Improved Electrochemical Performances of the Carbon Coated LiFePO4
- Li Ion Diffusivity and Improved Electrochemical Performances of the Carbon Coated LiFePO4
- 박창규; 박성빈; 오시형; 장호; 조원일
- LiFePO4; carbon; coating; lithium ion diffusivity; cyclic voltammetry; EIS; Lithium iron phosphate; Chemical diffusion coefficient; Electrochemical impedance spectroscopy
- Issue Date
- Bulletin of the Korean Chemical Society
- VOL 32, NO 3, 836-840
- 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.
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