Journal
NANO LETTERS
Volume 20, Issue 7, Pages 5504-5512Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.0c02053
Keywords
Ultrathick and low-tortuosity electrode; vertically aligned carbon fibers; high-areal-capacity; fast electron and ion transport; high thermal conductivity
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Funding
- University of Delaware
- NSF [CBET1706777]
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Thick electrode with high-areal-capacity is a practical and promising strategy to increase the energy density of batteries, but development toward thick electrode is limited by the electrochemical performance, mechanical properties, and manufacturing approaches. In this work, we overcome these limitations and report an ultrathick electrode structure, called fiberaligned thick or FAT electrode, which offers a novel electrode design and a scalable manufacturing strategy for high-areal-capacity battery electrodes. The FAT electrode uses aligned carbon fibers to construct a through-thickness fiber-aligned electrode structure with features of high electrode material loading, low tortuosity, high electrical and thermal conductivity, and good compression property. The low tortuosity of FAT electrode enables fast electrolyte infusion and rapid electron/ion transport, exhibiting a higher capacity retention and lower charge transfer resistance than conventional slurry-casted thick electrode design.
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