Anionic Redox Chemistry as a Clue for Understanding the Structural Behavior in Layered Cathode Materials. Issue 5 (14th January 2020)

• Record Type: Journal Article
• Authors: Lee, Wontae; Yun, Soyeong; Li, Hao; Kim, Jaeyoung; Lee, Hayeon; Kwon, Kyeongkeun; Lee, Jin Yong; Choi, Young‐Min; Yoon, Won‐Sub
• Is Part Of: Small. Volume 16:Issue 5(2020)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2020-01-14
• Subjects: anionic redox chemistry -- anisotropic lattice behavior -- cationic redox chemistry -- Ni‐rich layered cathode materials; Nanotechnology -- Periodicals; Nanoparticles -- Periodicals; Microtechnology -- Periodicals; 620.5
• DOI: 10.1002/smll.201905875
• Languages: English
• ISSNs: 1613-6810

Abstract

Abstract: The anionic redox chemistries of layered cathode materials have been in focus recently due to an intriguing phenomenon that cannot be described by the number of electrons of transition metal ions. However, even though several studies have investigated the anionic redox chemistry of layered materials in terms of the charge compensation, the relationship between the origin of the structural behavior and anionic redox chemistry in layered materials remains poorly understood. In addition, a simultaneous redox process of transition metal ions could occur through the d bands interaction. Here, it is demonstrated that the anionic redox chemistry is associated with the anisotropic structural behavior of the layered cathode materials albeit without providing additional capacities exceeding the theoretical values. These findings will provide a foundation of a new chapter in the understanding of the properties of materials. Abstract : The results in this work provide a fresh perspective on the charge compensation mechanism, and extend a limited view on the role of anions that has been mostly used to comprehend the charge compensation. The anionic redox chemistry not only contributes to the capacities but is also one of the key factors influencing the structural behavior of layered materials.