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Air- and Moisture Robust Surface Modification for Ni-Rich Layered Cathode Materials for Li-Ion Batteries. | LitMetric

AI Article Synopsis

  • - The development of high-energy cathodes mainly involves increasing the nickel (Ni) ratio in layered cathode materials, which boosts capacity but also leads to structural issues due to environmental exposure to harmful compounds.
  • - A new surface modification technique using a sol-gel coating has been developed for LiNi Co Mn O (NCM811) cathodes to enhance robustness against air and moisture, focusing on coating the internal surfaces of the particles.
  • - The study compares different coatings (bare, Li SnO, and LiCoO) on NCM811, finding that LiCoO-coated cathodes maintain capacity better after environmental exposure, whereas Li SnO-coated ones show capacity loss, highlighting the importance of effective internal coatings to prevent degradation

Article Abstract

The mainstream of high-energy cathode development is focused on increasing the Ni-ratio in layered structured cathode materials. The increment of the Ni portion in the layered cathode material escalates not only the deliverable capacity but also the structural degradation. High-Ni layered cathodes are highly vulnerable to exposure to air that contains CO and H O, forming problematic residual lithium compounds at the surface. In this work, a novel air- and moisture robust surface modification is reported for LiNi Co Mn O (NCM811) via the sol-gel coating method that selectively coats the internal surface area of the polycrystalline morphology secondary particles. Bare-, Li SnO -coated and LiCoO -coated NCM811 are exposed to different ambient environments (air, hot-air, and moisture-air) to systematically investigate the correlation between the internal/external coating morphology and performance degradations. The LiCoO -coated NCM811s exhibit high-capacity retention after exposure to all environments, due to the internal surface coating that prevents the penetration of harmful compounds into the polycrystalline NCM811. On the other hand, the Li SnO -coated NCM811s exposed to the ambient environments show gradual capacity fading, implying the occurrence of internal degradation. This paper highlights the impact of the internal degradation of polycrystalline NCM811 after environmental exposure and the correct coating mechanisms required to successfully prevent it.

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Source
http://dx.doi.org/10.1002/smll.202206576DOI Listing

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