Development of Cation Exchange Reaction for High-Performance Ni-Rich Cathodes in Lithium-Ion Batteries

Abstract

This research introduces a novel cation-exchange strategy within the hierarchical structure of nickel-rich layered materials, with a specific emphasis on their application as cathode materials in lithium-ion batteries. The primary objective is the selective deposition of cobalt (Co) onto primary particles within nickel-rich cathode materials. This strategic modification is aimed at alleviating the rapid capacity degradation, particularly under high-rate charging and discharging conditions characterized by high C-rates. The cation-exchange reaction results in grain boundaries enveloped by a localized Co distribution, introducing a structural change to the spinel crystal structure on top of the existing layered structure. This tailored modification significantly enhances cyclability compared to conventionally synthesized samples prepared through the co-precipitation method. Furthermore, the cation-exchange method proves to be an advantageous technique for regulating Co content, offering a practical solution for minimizing Co usage. This research underscores its potential in facilitating efforts to reduce Co reliance in cathode materials, aligning with the broader endeavor to enhance the electrochemical performance and stability of these materials, especially under high C-rate conditions.