Achieving High-Performance Spherical Natural Graphite Anode through a Modified Carbon Coating for Lithium-Ion Batteries

Hae-Jun Kwon, Sang-Wook Woo, Yong-Ju Lee, Je-Young Kim and Sung-Man Lee
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Hae-Jun Kwon: Department of Materials Science & Engineering, Kangwon National University, 1 Gangwondaehakgil, Chuncheon-Si 24341, Korea
Sang-Wook Woo: R&D Campus, LG Energy Solution, 188 Munji-ro, Yuseong-gu, Dae-jeon-Si 34122, Korea
Yong-Ju Lee: R&D Campus, LG Energy Solution, 188 Munji-ro, Yuseong-gu, Dae-jeon-Si 34122, Korea
Je-Young Kim: R&D Campus, LG Energy Solution, 188 Munji-ro, Yuseong-gu, Dae-jeon-Si 34122, Korea
Sung-Man Lee: Department of Materials Science & Engineering, Kangwon National University, 1 Gangwondaehakgil, Chuncheon-Si 24341, Korea

Energies, 2021, vol. 14, issue 7, 1-14

Abstract: The electrochemical performance of modified natural graphite (MNG) and artificial graphite (AG) was investigated as a function of electrode density ranging from 1.55 to 1.7 g∙cm −3 . The best performance was obtained at 1.55 g∙cm −3 and 1.60 g∙cm −3 for the AG and MNG electrodes, respectively. Both AG, at a density of 1.55 g∙cm −3 , and MNG, at a density of 1.60 g∙cm −3 , showed quite similar performance with regard to cycling stability and coulombic efficiency during cycling at 30 and 45 °C, while the MNG electrodes at a density of 1.60 g∙cm −3 and 1.7 g∙cm −3 showed better rate performance than the AG electrodes at a density of 1.55 g∙cm −3 . The superior rate capability of MNG electrodes can be explained by the following effects: first, their spherical morphology and higher electrode density led to enhanced electrical conductivity. Second, for the MNG sample, favorable electrode tortuosity was retained and thus Li+ transport in the electrode pore was not significantly affected, even at high electrode densities of 1.60 g∙cm −3 and 1.7 g∙cm −3 . MNG electrodes also exhibited a similar electrochemical swelling behavior to the AG electrodes.

Keywords: artificial graphite; natural graphite; electrochemical performance; negative electrode material; Li-ion battery (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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