Energy Storage Science and Technology ›› 2024, Vol. 13 ›› Issue (8): 2541-2549.doi: 10.19799/j.cnki.2095-4239.2024.0102

• Energy Storage Materials and Devices • Previous Articles     Next Articles

Controllable synthesis of FeS2 with different morphologies and their sodium storage performances

Lijun FAN1(), Baozhou WU1, Kejun CHEN2   

  1. 1.Hebi Vocational college of Energy and Chemistry, Hebi 458000, Henan, China
    2.Xinxiang University, Xinxiang 453000, Henan, China
  • Received:2024-02-01 Revised:2024-02-13 Online:2024-08-28 Published:2024-08-15
  • Contact: Lijun FAN E-mail:814906274@qq.com

Abstract:

As a typical conversion reaction-type anode material for sodium-ion batteries (SIBs), FeS2, which possesses the merits of nontoxic, low-cost, and high theoretical specific capacity, has become a potential anode material for SIBs. However, owing to the large atomic radius and mass of Na+, the Na storage process of FeS2 features sluggish kinetics, which hinders its practical applications. In this study, we synthesize FeS2 with different morphologies through a solvothermal method. The morphology can be easily controlled by changing the molar ratio of Fe and S in the precursor. Characterization results reveal that as-obtained FeS2 with different molar ratios of Fe and S presents an irregular spherical particle and a mixture of an irregular spherical particle and regular cubes. Furthermore, the Na storage performances of as-obtained samples were systematically investigated. FeS2 with a regular cubic morphology reveals a superior Na storage performance. A reversible discharge specific capacity of 354.5 mAh/g can be maintained at a current density of 0.1 A/g. Long-term cyclic tests reveal that after 500 cycles, a discharge specific capacity of 246.3 mAh/g can be obtained, which is 1.2 times higher than that of the control sample. A Na storage mechanism analysis indicates that FeS2 with a regular cube morphology presents a capacitive-dominated Na storage process, which promotes an enhanced rate capability and fast Na+ diffusion coefficient. This study can provide theoretical reference for fabricating high-performance anode materials for SIBs.

Key words: sodium ion battery, morphology control, anode materials, FeS2, soidum storage mechanisms

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