Coordinated preparation of pitch-based carbon microspheres for anode materials of high-rate potassium-ion batteries by emulsification/oxidation

doi:10.19799/j.cnki.2095-4239.2022.0765

Abstract

Abstract:

In this study, pitch-based carbon microspheres were successfully obtained by using a coordinated emulsification and oxidation method with coal tar pitch as the precursor and assisted by surfactant and dispersion medium without a template. The influence of emulsification temperature on the morphology of microspheres was explored, and the optimal temperature was determined to be 280 ℃. The prepared pitch-based carbon microspheres present excellent electrochemical performance with an initial discharge capacity of 310 mAh/g at 0.05 A/g and 102 mAh/g at 2 A/g. Their long-term cyclability was at 108 mAh/g after 1000 cycles at 1 A/g.The excellent potassium storage performance was because the cross-linking structure formed by low-temperature pre-oxidation can realize the structural evolution from order to disorder. In addition, the introduced oxygen-containing groups promoted crosslinking of precursor molecules at the spatial level, ensuring structural stability during electrochemical de-/intercalation. Nevertheless, they produced abundant vacancies and defects, thereby increasing potassium storage sites.

Key words: coal tar pitch, carbon materials, potassium ion batteries, anode

CLC Number:

TQ 536

Chang LIU, Junjun YAO, Ying SUN, Daming FENG, Hongjie ZHENG, Tianyi MA. Coordinated preparation of pitch-based carbon microspheres for anode materials of high-rate potassium-ion batteries by emulsification/oxidation[J]. Energy Storage Science and Technology, 2023, 12(5): 1444-1452.

Figures/Tables 7

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