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Nanocubes composed of FeS2@C nanoparticles as advanced anode materials for K-ion storage

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Abstract

K-ion batteries (KIBs) are considered as one of the most promising devices for large-scale energy storage because of the comparable output voltage with lithium-ion batteries and the abundant reserves of potassium. FeS2 is regarded as a kind of very important anode material for KIBs due to its low cost and high capacity. However, the poor electronic conductivity and huge volume expansion of FeS2 during the discharge/charge process strongly inhibit the K-storage performance. To solve these problems, herein, unique core–shell FeS2@C nanocubes with nanoparticles in the interior and carbon shells in the exterior are designed. The inside FeS2 nanoparticles are beneficial for K+ diffusion and the penetration of the electrolyte, while the outside carbon shells can enhance the electronic conductivity and suppress the volume expansion. The unique core–shell structure displays outstanding K-storage performance with impressive specific capacity, excellent cycling stability, and superior rate capability with 73% capacity retention at 2 A g−1. This work not only provides solutions to obtain a superior anode material for KIBs but also offers insights into designing a hierarchical structure for energy storage systems.

Graphical abstract: Nanocubes composed of FeS2@C nanoparticles as advanced anode materials for K-ion storage

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Publication details

The article was received on 30 Aug 2019, accepted on 28 Oct 2019 and first published on 05 Nov 2019


Article type: Research Article
DOI: 10.1039/C9QI01115C
Inorg. Chem. Front., 2020, Advance Article

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    Nanocubes composed of FeS2@C nanoparticles as advanced anode materials for K-ion storage

    Y. Luo, M. Tao, J. Deng, R. Zhan, B. Guo, Q. Ma, M. K. Aslam, Y. Qi and M. Xu, Inorg. Chem. Front., 2020, Advance Article , DOI: 10.1039/C9QI01115C

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