High-Power Battery Electrodes Fabricated by Acupuncture-Inspired Microneedle Processing

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• High-power battery applications require advanced electrode performance.
• Conventional electrode fabrication methods present challenges in complexity, cost, and environmental impact.

Purpose of the Study:

• To introduce an eco-friendly and cost-effective microneedle fabrication process for lithium iron phosphate electrodes.
• To enhance electrolyte infiltration and ion transport kinetics in battery electrodes.

Main Methods:

• Utilized commercial cosmetic microneedle molds to create micro-holes on electrode surfaces.
• Characterized punctured electrodes using scanning electron microscopy and 3D metallurgical microscopy.
• Conducted detailed electrochemical evaluations and simulations to assess performance.

Main Results:

• Microneedle-processed electrodes demonstrated superior rate performance and diffusion properties compared to pristine electrodes.
• Low-curvature holes effectively reduced Li-ion concentration polarization and improved Li-ion transport.
• Achieved higher specific capacities and enhanced rate capabilities in the modified electrodes.

Conclusions:

• The microneedle technique offers a promising, scalable method for producing high-performance battery electrodes.
• This innovation can contribute to the development of high-power-density batteries.
• The study validates the effectiveness of microneedle-induced porosity for improved electrochemical performance.