Biodegradable batteries with immobilized electrolyte for transient MEMS

Area of Science:

• Materials Science
• Electrochemistry
• Biomedical Engineering

Background:

• Biodegradable batteries are crucial for sustainable biomedical and environmental applications.
• Challenges include power, compactness, stability, and lifetime, particularly concerning liquid electrolytes.
• Environmental fluid harvesting for electrolytes is desirable but requires stable internal electrochemical conditions.

Purpose of the Study:

• To develop a biodegradable battery with enhanced stability and longevity.
• To address the limitations of liquid electrolytes in microfabricated biodegradable batteries.
• To create a device that can utilize environmental fluids while maintaining consistent performance.

Main Methods:

• Development of a biodegradable battery utilizing a solid electrolyte composed of sodium chloride and polycaprolactone.
• Design to harness ambient body or environmental fluid as part of the electrolyte.
• Incorporation of a large excess of sodium chloride to stabilize intracell ionic conditions.

Main Results:

• Achieved a constant discharge profile despite varying external aqueous conditions.
• Demonstrated compact and stable-performing biodegradable battery cells.
• The solid electrolyte's polymeric structure prevented short-circuiting between electrodes.

Conclusions:

• The novel solid electrolyte design enables stable electrochemical performance in biodegradable batteries.
• This approach facilitates the creation of compact, long-lasting, and easily activated devices.
• The technology offers a simplified strategy for fabricating batteries with extended shelf and functional lifetimes.