4.7 Article

Rational design of few-layer FePS3 nanosheets@N-doped carbon composites as anodes for sodium-ion batteries

期刊

CHEMICAL ENGINEERING JOURNAL
卷 427, 期 -, 页码 -

出版社

ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.130882

关键词

Anodes; Metal phosphorus trichalcogenides; Nanosheets; Carbon coating; Sodium-ion batteries

资金

  1. National Natural Science Foundation of China [51871119, 51901100]
  2. Fundamental Research Funds for the Central Universities [NE2017004, NS2018040]
  3. Jiangsu Provincial Founds for Natural Science Foundation [BK20170793, BK20180015]
  4. Six Talent Peak Project of Jiangsu Province [2018-XCL033]
  5. China Postdoctoral Science Foundation [2018M640481, 2019T120426]
  6. Jiangsu Postdoctoral Research Fund [2019K003]

向作者/读者索取更多资源

This study presents a simple and convenient method to synthesize FePS3@NC material with superior battery performance and cycling stability. By controlling the surface coating of polydopamine and subsequent carbonization, the FePS3@NC material exhibits improved electrode performance.
The development of anode materials with high-rate capability and long cyclability has become a research hotspot for sodium-ion batteries (SIBs). In this work, we propose a simple and convenient method for the synthesis of few-layered FePS3 nanosheets modified by N-doped carbon (FePS3@NC) through a controllable coating of polydopamine on the surface of exfoliated FePS3 nanosheets followed by subsequent carbonization. The optimized FePS3@NC anode exhibits a superior capacity performance for 800 cycles with a high specific capacity of 281 mAh g(-1) at 1.0 A g(-1) due to high ionic conductivity of metal phosphorus trichalcogenides (MPS3) and the unique two-dimensional (2D) few-layered structure of ultrathin nanosheets. Besides, the N-doped carbon layer (NC) decreases Na+ diffusion resistance and buffers the volumetric change during cycles, which are validated by the ex-situ X-ray diffraction and density functional theory (DFT) calculations. Furthermore, the full cell coupled by FePS3@NC anode and Na3V2(PO4)(3)/carbon (NVP/C) cathode also displays high cycling stability. This work gives insight into the development of superior properties anodes for SIBs based on two-dimensional (2D) van der Waals crystals.

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