Journal
INORGANIC CHEMISTRY FRONTIERS
Volume 7, Issue 2, Pages 394-401Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9qi01115c
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Funding
- National Natural Science Foundation of China [21773188]
- Fundamental Research Funds for the Central Universities [XDJK2019AA002]
- Postgraduate tutor team building project [XYDS201911]
- Program for Experimental Technology Research of Southwest University [SYJ2019006]
- China Postdoctoral Science Foundation
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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.
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