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V2CT MXene modification enabling stable sodium metal anodes.

Zechen Ma1, Zhibin Li2, Wenjie Mai2

  • 1School of Materials Science and Engineering, South China University of Technology, Guangzhou 510641, China. jxhong@scut.edu.cn.

Chemical Communications (Cambridge, England)
|March 13, 2025
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Summary
This summary is machine-generated.

We developed a simple method to combine V2CT MXene with sodium metal anodes for better sodium metal batteries. This approach prevents dendrite formation and enhances sodium plating/stripping for improved battery performance.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Sodium metal batteries (SMBs) are promising for next-generation energy storage due to sodium's high theoretical capacity.
  • However, uncontrolled sodium dendrite growth during cycling leads to poor reversibility and safety hazards.
  • Developing stable and efficient anodes is crucial for advancing SMB technology.

Purpose of the Study:

  • To investigate the use of V2CT MXene as a host material for sodium metal anodes.
  • To evaluate the impact of V2CT MXene on the sodium plating/stripping behavior and electrochemical performance of SMBs.
  • To provide a feasible strategy for achieving dendrite-free and highly reversible sodium metal anodes.

Main Methods:

  • A simple mechanical mixing strategy was employed to directly incorporate V2CT MXene with metallic sodium.
  • The electrochemical performance of the composite anode was evaluated using Na plating/stripping tests in Na metal batteries.
  • Surface functional groups of V2CT MXene were analyzed for their role in sodium ion deposition.

Main Results:

  • The V2CT MXene host effectively enabled highly reversible and dendrite-free sodium plating/stripping.
  • Uniform Na+ deposition was observed on the V2CT anode, attributed to abundant -O and -F surface functional groups.
  • The composite anode demonstrated significantly improved electrochemical performance compared to bare sodium metal.

Conclusions:

  • Direct incorporation of V2CT MXene with metallic sodium provides a viable strategy for developing stable sodium metal anodes.
  • The surface functional groups of V2CT MXene play a critical role in promoting uniform sodium deposition.
  • This work offers a promising approach to enhance the safety and performance of sodium metal batteries.