Hierarchically Interpenetrated and Reentrant Microcellular Frameworks for Stretchable Lithium Metal Batteries

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Wearable devices require flexible and stretchable energy storage components.
• Lithium metal electrodes offer high energy density but lack mechanical stability for flexible applications.

Purpose of the Study:

• To create a stretchable framework for lithium metal electrodes using a hierarchically interpenetrated reentrant microcellular structure.
• To enhance the electrochemical performance and mechanical stability of lithium metal electrodes for wearable energy storage.

Main Methods:

• Fabrication of a composite structure combining 2D graphene/MXene/carbon nanotubes (CNTs) with 3D melamine foam.
• Creation of a reentrant microcellular structure via radial compression for enhanced stretchability.
• Electrochemical testing of lithium-deposited composite electrodes under mechanical strain.

Main Results:

• The composite electrodes demonstrated stable structural deformability and high electrical conductivity.
• Lithium deposition on the framework showed improved lithiophilicity and mechanical stability.
• Electrodes exhibited lower overpotential during lithium stripping/plating and stable performance under 30% strain.

Conclusions:

• The developed reentrant microcellular structure provides a promising framework for stretchable lithium metal electrodes.
• This approach advances the design of high-energy-density batteries for flexible and wearable electronics.