ScholarLens Back to search
2022•Research SquareOpen access

Optimizing Kinetics of Anionic Redox Reaction in Cathode Material by Distinct 4d Transition-metal Substitution

Kehua Dai, Beibei Zhao, Weiwei Shao, Wenjuan Zhang, Jing Mao, Jinpeng Wu, Zengqing Zhuo, Liang Zhang, Ning Li, Wei Tong, Gao Liu, Wanli Yang

Open full text 0 citations

Abstract

Abstract Anionic redox reactions (ARR) offer significant opportunities for developing high-energy-density batteries. However, suffering from the sluggish anionic kinetics, the concept meets serious challenges on practical application. Recently, the interplay between cationic and anionic redox processes on kinetics is revealed and the mixed cationic/anionic redox process shows faster kinetics. In this work, we further find that stronger TM(4d)–O(2p) (e. g. Ru–O) hybridization improves the kinetics of independent ARR. The redox reactions of Na2/3Mg1/3Mn1/2Ru1/6O2 (NMMR) and their evolution of Ru, Mn, and O during charging and discharging is studied in detail. The O and TM redox process in initial cycle are distinguished. Then, the different influence on kinetics in ARR and TM redox stages by Ru substitution is unraveled. The significantly improved Na+ diffusion coefficient in NMMR indicates stronger TM(4d)–O(2p) (Ru–O) hybridization does optimize the kinetics of ARR.

Open-access reader

About this research paper

What this paper is about

Abstract Anionic redox reactions (ARR) offer significant opportunities for developing high-energy-density batteries. However, suffering from the sluggish anionic kinetics, the concept meets serious challenges on practical application. Recently, the interplay between cationic and anionic redox processes on kinetics is revealed and the mixed cationic/anionic redox process shows faster kinetics. In this work, we further find that stronger TM(4d)–O(2p) (e. g. Ru–O) hybridization improves the kinetics of independent ARR. The redox reactions of Na2/3Mg1/3Mn1/2Ru1/6O2 (NMMR) and their evolution of Ru, Mn, and O during charging and discharging is studied in detail. The O and TM redox process in initial cycle are distinguished. Then, the different influence on kinetics in ARR and TM redox stages by Ru substitution is unraveled. The significantly improved Na+ diffusion coefficient in NMMR indicates stronger TM(4d)–O(2p) (Ru–O) hybridization does optimize the kinetics of ARR.

Why it matters

A significance statement is not available in the OpenAlex record.

Key contribution

A contribution statement is not available in the OpenAlex record.

Method / approach

Method details are not available in the OpenAlex metadata.

Main findings

Findings are not separately available in the OpenAlex metadata.

Limitations

Limitations are not available in the OpenAlex metadata.

Applications

Application details are not available in the OpenAlex metadata.

Available abstract

Abstract Anionic redox reactions (ARR) offer significant opportunities for developing high-energy-density batteries. However, suffering from the sluggish anionic kinetics, the concept meets serious challenges on practical application. Recently, the interplay between cationic and anionic redox processes on kinetics is revealed and the mixed cationic/anionic redox process shows faster kinetics. In this work, we further find that stronger TM(4d)–O(2p) (e. g. Ru–O) hybridization improves the kinetics of independent ARR. The redox reactions of Na2/3Mg1/3Mn1/2Ru1/6O2 (NMMR) and their evolution of Ru, Mn, and O during charging and discharging is studied in detail. The O and TM redox process in initial cycle are distinguished. Then, the different influence on kinetics in ARR and TM redox stages by Ru substitution is unraveled. The significantly improved Na+ diffusion coefficient in NMMR indicates stronger TM(4d)–O(2p) (Ru–O) hybridization does optimize the kinetics of ARR.

Key concepts: Redox, Kinetics, Cathode, Substitution (logic), Transition metal, Chemistry, Substitution reaction, Inorganic chemistry

Related papers

Related paper 1Related paper 2Related paper 3
Back to paper searchBrowse research topicsOriginal source
Optimizing Kinetics of Anionic Redox Reaction in Cathode Material by Distinct 4d Transition-metal Substitution — Research Paper | ScholarLens