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

Junjie Shao, Xiaodong Wang, Houhua Ceng, Lan Hu and Zhean Su ()
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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

Energies, 2025, vol. 18, issue 6, 1-15

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.

Keywords: sol–gel pyrolysis blowing; NaH 2 PO 2 phosphorization; FeP 2 nanoparticles; honeycomb-like carbon matrix; Li-ion storage (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2025
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