Study on the effects of carbon coating on lithium-storage kinetics for soft carbon

doi:10.19799/j.cnki.2095-4239.2022.0606

Abstract

Abstract:

Carbon-coating is a simple and practical method to improve the electrochemical performance of soft carbon anode for fast-charging lithium-ion battery, e.g., reducing the loss of active lithium during the formation of the solid electrolyte interface (SEI) film, and thereby improving the initial coulombic efficiency. However, the systematic study of relationships between carbon-coating layer properties and electrochemical performances is still lacking. Therefore, two soft carbon materials with different carbon-coating layers were used as model materials, which were prepared by vapor-phase method and solid-phase method, respectively. SEM, TEM, XRD and Raman were conducted to characterize the structural evolution of the soft carbon in the coating process. CV, GCPL, EIS and GITT were conducted to analyze the electrochemical performance of carbon-coating soft carbon. This work provides a good guidance for the development of fast-charging soft carbon material.

Key words: lithium-ion battery, anode, soft carbon, carbon coating, kinetics

CLC Number:

TM 911

Fanju MENG, Xi ZHANG, Zhijun QIAO, Bin YANG, Miao YU, Yuzuo WANG, Dianbo RUAN. Study on the effects of carbon coating on lithium-storage kinetics for soft carbon[J]. Energy Storage Science and Technology, 2022, 11(11): 3548-3557.

Figures/Tables 9

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Table 1

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Electrode materials	R_e/Ω	R_s/Ω	R_ct/Ω	R_warburg/Ω
SC	3	7.9	18.8	0.29
C-SC	2.8	5.1	22.3	0.59
S-SC	3.3	7	56.6	2.84

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