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Mott-Schottky Effect in Core-Shell W@Wx C Heterostructure: Boosting Both Electronic/Ionic Kinetics for Lithium

Yao Yang1, Bing Sun2, Yinhong Gao1

  • 1Hubei Province Key Laboratory of Coal Conversion and New Carbon Materials, School of Chemistry and Chemical Engineering, Wuhan University of Science and Technology, 430081, Wuhan, China.

Small (Weinheim an Der Bergstrasse, Germany)
|May 11, 2023
PubMed
Summary

Researchers developed a novel W@WxC core-shell structure for lithium-ion batteries (LIBs). This Mott-Schottky heterostructure significantly enhances charging speeds and electrochemical stability in LIB anodes.

Keywords:
Mott-Schottky heterostructuresW@WxC nanoparticlescore-shell structureselectronic/ionic kineticslithium-ion batteries

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Traditional metal carbides (TMCs) exhibit slow dynamics, limiting fast-charging capabilities in lithium-ion batteries (LIBs).
  • Developing advanced anode materials is crucial for improving LIB performance.

Purpose of the Study:

  • To engineer a core-shell W@WxC heterostructure to enhance electronic and ionic transport kinetics in LIBs.
  • To investigate the application of Mott-Schottky heterostructures for improved battery performance.

Main Methods:

  • Synthesis of a W@WxC core-shell nanostructure with heterogeneous interfaces.
  • Fabrication of LIB electrodes using the novel W@WxC material.
  • Electrochemical testing to evaluate capacity, stability, and energy density.

Main Results:

  • The W@WxC heterostructure demonstrated accelerated electronic and ionic transport via the Mott-Schottky effect.
  • The electrode maintained a capacity of 173.8 mA h g-1 after 1600 cycles at 5 A g-1.
  • A full cell utilizing this anode achieved an energy density of 360.2 Wh kg-1.

Conclusions:

  • The W@WxC core-shell structure effectively improves the electrochemical stability and fast-charging performance of LIB anodes.
  • The Mott-Schottky heterostructure presents a promising strategy for next-generation LIB materials.