Lithium interphase enhancement for applications in lithium-sulphur batteries

Area of Science:

• Electrochemistry
• Materials Science

Background:

• Metallic lithium anodes are crucial for advanced batteries but suffer from unstable plating/stripping.
• This instability hinders the development of high-energy-density systems like lithium-sulfur and lithium-air batteries.

Purpose of the Study:

• To develop a facile, cost-effective method for stabilizing lithium metal anodes.
• To improve the cycling stability and performance of lithium-sulfur cells using a modified lithium anode.

Main Methods:

• A protective layer was formed on lithium metal by immersing it in a nitrogen-saturated solution.
• This method avoids the need for controlled atmosphere operations required by other approaches.
• The modified lithium anode was tested in a symmetric configuration and in lithium-sulfur cells.

Main Results:

• Nitrogen-treated lithium exhibited enhanced cycling stability and chemical stability.
• The treated lithium anode significantly improved the cycling stability and coulombic efficiency of lithium-sulfur cells.
• Rate capability of the lithium-sulfur cells was also notably enhanced.

Conclusions:

• The nitrogen treatment offers a practical and scalable solution for stabilizing lithium metal anodes.
• This approach effectively addresses a key challenge in developing next-generation high-energy batteries.
• The method demonstrates significant potential for improving the performance of lithium-sulfur battery technology.