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Rapid Synthesis of Honeycomb-Structured FeP 2 @NHC for High-Rate and Durable Lithium Storage

Author

Listed:
  • Junjie Shao

    (National Key Laboratory of Science and Technology on High-Strength Structural Materials, Central South University, Changsha 410083, China)

  • Xiaodong Wang

    (National Key Laboratory of Science and Technology on High-Strength Structural Materials, Central South University, Changsha 410083, China)

  • Houhua Ceng

    (National Key Laboratory of Science and Technology on High-Strength Structural Materials, Central South University, Changsha 410083, China)

  • Lan Hu

    (National Key Laboratory of Science and Technology on High-Strength Structural Materials, Central South University, Changsha 410083, China)

  • Zhean Su

    (National Key Laboratory of Science and Technology on High-Strength Structural Materials, Central South University, Changsha 410083, China)

Abstract

The concurrent preservation of structural integrity and improvement of electrical conductivity in FeP 2 anodes presents a persistent challenge. Herein, FeP 2 nanoparticles embedded within a 3D N-doped honeycomb-like carbon framework composite (FeP 2 @NHC) are synthesized through a phosphorization process with a honeycomb-like Fe 3 C@NHC as a precursor. The in situ incorporation of FeP 2 nanoparticles into the 3D carbon matrix effectively restrains the aggregation, pulverization, and stripping of material during cycling, and significantly enhances reaction kinetics and structural stability, achieving a superior electrochemical performance. Specifically, FeP 2 @NHC electrodes demonstrate remarkable reversible capacity (1433.9 mA h g −1 at 0.1 A g −1 ), excellent rate-capability (399.9 mA h g −1 at 10 A g −1 ), and ultra-long cycle life (631.5 mA h g −1 after 1000 cycles at 2 A g −1 ). Moreover, XRD analysis reveals that iron-rich Fe 3 C and Fe 3 O 4 precursors can react with NaH 2 PO 2 to form FeP 2 and FeP, respectively. This study offers a rational and practical strategy for designing other phosphorus-rich metal phosphide anode materials.

Suggested Citation

  • Junjie Shao & Xiaodong Wang & Houhua Ceng & Lan Hu & Zhean Su, 2025. "Rapid Synthesis of Honeycomb-Structured FeP 2 @NHC for High-Rate and Durable Lithium Storage," Energies, MDPI, vol. 18(6), pages 1-15, March.
    • Handle: RePEc:gam:jeners:v:18:y:2025:i:6:p:1358-:d:1609050
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