Study on the effects of pore structure on lithium-storage performances for soft carbon

doi:10.19799/j.cnki.2095-4239.2022.0037

Abstract

Abstract:

Soft carbon is an ideal anode material for fast-charging lithium-ion battery which has the high rate-performance, high reversible capacity, and good compatibility with electrolytes. It has been discovered that soft carbon's electrochemical performances can be further enhanced by pore-making treatment, but a systematic study on the relationship between pore structure and electrochemical performance is still absent. Thus, in this study, soft carbon materials with various pore structures were prepared using the various precursor materials, including Jinzhou and JEF needle coke. The SEM, XRD, Raman, and N₂ isothermal adsorption were employed to examine the changes in microstructure for as-obtained soft carbon materials; The CV, GCPL, EIS, and GITT were employed to examine the effect of pore size distribution on their electrochemical performance. It was discovered that the micropores in soft carbon contributed less to the irreversible capacity during first cycling. When there are suitable micropores (63%) in soft carbon, the lithium-storage capacity and kinetics can be improved without sacrificing the Coulombic efficiency and cycling stability, therefore attaining both high capacity and rate performance.

Key words: lithium-ion battery, anode, soft carbon, micropore, lithium-storage performance

CLC Number:

TM 911

Yuzuo WANG, Jin WANG, Yinli LU, Dianbo RUAN. Study on the effects of pore structure on lithium-storage performances for soft carbon[J]. Energy Storage Science and Technology, 2022, 11(7): 2023-2029.

Figures/Tables 5

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