Volume 6, Issue 3 2101524
Research Article

Anionic Redox Activities Boosted by Aluminum Doping in Layered Sodium-Ion Battery Electrode

Chen Cheng

Chen Cheng

Institute of Functional Nano and Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Soochow University, Suzhou, 215123 China

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Manling Ding

Manling Ding

Institute of Functional Nano and Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Soochow University, Suzhou, 215123 China

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Tianran Yan

Tianran Yan

Institute of Functional Nano and Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Soochow University, Suzhou, 215123 China

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Jinsen Jiang

Jinsen Jiang

Institute of Functional Nano and Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Soochow University, Suzhou, 215123 China

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Jing Mao

Jing Mao

School of Materials Science and Engineering, Zhengzhou University, Zhengzhou, 450001 China

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Xuefei Feng

Xuefei Feng

National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, 230026 China

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Ting-Shan Chan

Ting-Shan Chan

National Synchrotron Radiation Research Center, Hsinchu, 30076 Taiwan

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Ning Li

Corresponding Author

Ning Li

Beijing Institute of Technology Chongqing Innovation Center, Chongqing, 401120 China

Beijing Key Laboratory of Environmental Science and Engineering, School of Material Science and Engineering, Beijing Institute of Technology, Beijing, 100081 China

E-mail: [email protected]; [email protected]

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Liang Zhang

Corresponding Author

Liang Zhang

Institute of Functional Nano and Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Soochow University, Suzhou, 215123 China

E-mail: [email protected]; [email protected]

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First published: 27 January 2022
Citations: 30

Abstract

Sodium-ion batteries (SIBs) have attracted widespread attention for large-scale energy storage, but one major drawback, i.e., the limited capacity of cathode materials, impedes their practical applications. Oxygen redox reactions in layered oxide cathodes are proven to contribute additionally high specific capacity, while such cathodes often suffer from irreversible structural transitions, causing serious capacity fading and voltage decay upon cycling, and the formation process of the oxidized oxygen species remains elusive. Herein, a series of Al-doped P2-type Na0.6Ni0.3Mn0.7O2 cathode materials for SIBs are reported and the corresponding charge compensation mechanisms are investigated qualitatively and quantitatively. The combined analyses reveal that Al doping boosts the reversible oxygen redox reactions through the reductive coupling reactions between orphaned O 2p states in NaOAl local configurations and Ni4+ ions, as directly evidenced by X-ray absorption fine structure results. Additionally, Al doping also induces an increased interlayer spacing and inhibits the unfavorable P2 to O2 phase transition upon desodiation/sodiation, which is common in P2-type Mn-based cathode materials, leading to the great improvement in capacity retention and rate capability. This work provides deeper insights into the development of structurally stable and high-capacity layered cathode materials for SIBs with anion–cation synergetic contributions.

Conflict of Interest

The authors declare no conflict of interest.

Data Availability Statement

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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