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Heterostructure-promoted rate performance of CoS2 in thermal activated batteries

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  • Yang, Peng
  • Zhang, Xicheng
  • Cao, Yong
  • Xie, Yong
  • Wang, Chao
  • Li, Xinlu
  • Cui, Yanhua

Abstract

CoS2 cathode has been extensively adopted for application in thermal batteries due to its excellent electrochemical performance. However, CoS2 undergoes rapid discharge degradation at high-rates or low working temperatures because of its high polarization resistance. This is ascribed to the kinetically slow rate of Li+ inset in the CoS2 cathode. With the aim of accelerating charge carrier exchange at the cathode-electrolyte interface, the construction of a heterostructure with an engineered electronic structure at the surface of CoS2 is described in this present work. The results show that the specific discharge capacity (V ≥ 1.75 V) of heterostructured CoS2 increases 23% at 500 °C and 42.3% at 450 °C with discharge currents of 300 and 100 mA cm−2, respectively. Electrochemistry measurements and density functional theory (DFT) analysis decipher that N modification alters the surface structure of CoS2, resulting in beneficial “defect” formation, that further enhances surface exchange density and the adsorption capability of Li+.

Suggested Citation

  • Yang, Peng & Zhang, Xicheng & Cao, Yong & Xie, Yong & Wang, Chao & Li, Xinlu & Cui, Yanhua, 2024. "Heterostructure-promoted rate performance of CoS2 in thermal activated batteries," Applied Energy, Elsevier, vol. 361(C).
    • Handle: RePEc:eee:appene:v:361:y:2024:i:c:s030626192400299x
    DOI: 10.1016/j.apenergy.2024.122916
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    1. Sung-Kyun Jung & Hyunchul Kim & Min Gee Cho & Sung-Pyo Cho & Byungju Lee & Hyungsub Kim & Young-Uk Park & Jihyun Hong & Kyu-Young Park & Gabin Yoon & Won Mo Seong & Yongbeom Cho & Myoung Hwan Oh & Hae, 2017. "Lithium-free transition metal monoxides for positive electrodes in lithium-ion batteries," Nature Energy, Nature, vol. 2(2), pages 1-9, February.
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