AI Article Synopsis
- Increasing porosity in thick electrode design enhances charge transport but reduces overall energy density.
- A new approach using a densified electrode with electrolyte-buffering voids allows for better performance with lower porosity (38%).
- This method achieves high energy densities of 330 Wh/kg and 614 Wh/L while maintaining cycling stability, and is compatible with industrial manufacturing techniques.
Article Abstract
A common practice in thick electrode design is to increase porosity to boost charge transport kinetics. However, a high porosity offsets the advantages of thick electrodes in both gravimetric and volumetric energy densities. Here we design a freestanding thick electrode composed of highly densified active material regions connected by continuous electrolyte-buffering voids. By wet calendering of the phase-inversion electrode, the continuous compact active material region and continuous ion transport network are controllably formed. Rate capabilities and cycling stability at high LiFePO loading of 126 mg cm were achieved for the densified cathode with porosity as low as 38%. The decreased porosity and efficient void utilization enable high gravimetric/volumetric energy densities of 330 Wh kg and 614 Wh L, as well as improved power densities. The versatility of this method and the industrial compatible "roll-to-roll" fabrication demonstrate an important step toward the practical application of thick electrodes.
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| http://dx.doi.org/10.1021/acs.nanolett.1c03724 | DOI Listing |
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