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Hollow Microneedle-based Sensor for Multiplexed Transdermal Electrochemical Sensing

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Published on: June 1, 2012

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

Chun-Yang Kang¹, Le-Yen Lin², Thao Nguyen³

¹Industry Academia Innovation School, National Yang Ming Chiao Tung University, Hsinchu 300093, Taiwan.

ACS Applied Materials & Interfaces

|October 3, 2024

Summary

Eco-friendly microneedles create tiny holes in lithium iron phosphate electrodes, boosting electrolyte infiltration and ion transport for better battery performance and higher energy density.

Keywords:

concentration polarization diffusion coefficients ion transport kinetics low-tortuosity porous electrodes rate performance

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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.