Stabilizing the anodic interface for solid-state lithium metal batteries by combining a low-strain lithium/carbon...

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Solid-state lithium metal batteries offer enhanced safety but face challenges with interface stability.
• Volume changes during lithium plating/stripping cause pressure fluctuations and degrade performance.

Purpose of the Study:

• To develop a stable interface for solid-state lithium metal batteries.
• To accommodate lithium volume changes and reduce internal pressure fluctuations.
• To improve the cycle life of solid-state batteries.

Main Methods:

• A low-strain 3D lithium-carbon anode was combined with an in situ polymerized solid polymer electrolyte.
• Interface stability was investigated under low pressure conditions.
• Electrode performance and pressure changes were monitored during cycling.

Main Results:

• The proposed configuration significantly enhanced interface stability.
• Lithium volume changes were accommodated, reducing internal pressure fluctuation from 13.9% to 6.5%.
• Cycle life was extended over tenfold compared to planar electrodes.

Conclusions:

• The 3D anode and solid polymer electrolyte design offers a promising route for practical solid-state batteries.
• Improved interface stability and reduced pressure fluctuations are key to long cycle life.
• This approach addresses critical challenges in solid-state battery technology.