A Perspective on the Requirements of Ni-rich Cathode Surface Modifications for Application in Lithium-ion Batteries and All-Solid-State Lithium-ion Batteries

초록

The increasing adoption of Ni-rich cathode active materials in commercial liquid electrolyte Lithium-ion batteries (LIBs) is testament to the improvements in the cathode stability through various surface modification strategies. The development of a deeper understanding of the cathode/electrolyte interface in LIBs has resulted in coatings capable of mitigating both surface and bulk cathode degradation mechanisms. However, due to increasing demands for safe and high energy density cells, a large portion of the research has now shifted towards applying Ni-rich cathode active materials in inherently safer all-solid-state Lithium-ion batteries (ASSLBs), with the resulting cathode surface modification strategies evolving differently. In this regard, a review outlining the surface modification strategies of Ni-rich cathode materials applied in both LIB and ASSLB systems is provided. Within, a review of the traditional, advanced and specialized surface modification strategies of each system is discussed, along with a final perspective on the likely future direction of research regarding the design of system-specific Ni-rich cathode-based surface modification strategies. Ni-rich layered cathode materials require different surface modification strategies depending on the electrolyte system. In liquid electrolyte-based lithium-ion batteries, ensuring chemical protection requires not only external but also internal surface modification. In all-solid-state lithium-ion batteries, there is a demand for uniform external and internal surface coating to enhance ionic conductivity.+ image

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