Characterization Assisted Lithium Ion Cathode Design: Application of Solid-State NMR to Understand Bulk and Interface Relation of Aluminum Coated and Doped NMC Cathodes

摘要

Researchers worldwide are searching for new electrochemical energy storage materials that meet high energy density, life, cost, and safety requirements of batteries for electric vehicle applications. The strategies for developing new chemistries with higher energy density, stability and safety concerns involve mitigating the problems of existing materials and understanding the structural changes and their relations with materials activity which requires characterization assisted material synthesis. For lithium ion cathode design, some of the mitigation strategies for low electrochemical cycle life, stability and safety concerns involve, increase of lithium content, change transition metal composition and use of different dopants and surface coatings. However, each change brings additional challenge to understand the structural modifications induced and its relationship with materials activity.