Fabrication of low-tortuosity thick electrodes with low material loss by temporally shaped ultraviolet femtosecond laser.

ABSTRACT: Conventional battery electrodes exhibit high tortuosity, which severely impedes ion transport. This limitation restricts electrode thickness, decreases power density, and shortens battery lifetime. Fabricating through-holes can reduce tortuosity, but existing methods are generally complex with poor space utilization. Here, an array of high-density through-holes are fabricated by temporally shaped ultraviolet femtosecond laser. Using this technique, we achieve a 47:1 aspect ratio (6 μm in diameter), ensuring low material loss (<1%) for 280 μm-thick LiFePO₄ (LFP) electrodes. The through-hole array reduces tortuosity of LFP thick electrodes by 19.1% (30 mg cm^-2), 19.0% (40 mg cm^-2), and 20.2% (60 mg cm^-2), improving the specific energy density of ba

SUBMITTER: Wu J 

PROVIDER: S-EPMC12847956 | biostudies-literature | 2025 Dec

REPOSITORIES: biostudies-literature