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Processable Hydroxide Ink with Oriented Microstructure
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DOI：10.1002/adma.202305871.png)
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Abstract
En 中文
The intrinsic poor processability of hydroxide originating from the structural property greatly hinders their practical applications. Here, a processable highly-concentrated nickel/cobalt double hydroxide ink is reported to meet the practical demand. The inner nanoflakes in ink possess a high width/thickness ratio (>100), which endows the highly-concentrated ink (60 mg mL(-1)) with liquid-like rheology properties. Further, the elliptical diffusive arc in small-angle X-ray scattering pattern and porous and ordered alignment morphology in cryogenic temperature scanning electron microscopy confirms the locally oriented arrangement of nanoflakes in the ink. Benefiting from this interior-ordered structure, the ink can be processed into meter-level film, continuous yarn, and rigid and free-standing aerogel, respectively. In particular, the films can be used as electrodes directly in aqueous zinc ion batteries and deliver a favorable capacity (382 mAh g(-1) @ 200 mA g(-1)) as well as long cycle stability (capacity retention rate of 88% @ 1000 mA g(-1) after 400 cycles). Moreover, the enlarged-batched fabrication with the introduction of efficient thermal conduction in a 10 L reactor is also carried out successfully. These results clarify the inner relationship between microstructure-rheology and mechanical engineering for hydroxides, thus paving the way to develop hydroxide-based products for future practical applications.
Keywords:
2D hydroxides
processable hydroxide ink
scale-up fabrication
zinc ion batteries
Journal
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26.8
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3.5W
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51.9W
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