Moderate active Fe3+ doping enables improved cationic and anionic redox reactions for wide-voltage-range sodium storage
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Published:2024-01-09
Issue:1
Volume:3
Page:
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ISSN:2788-8614
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Container-title:Carbon Neutrality
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language:en
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Short-container-title:Carb Neutrality
Author:
Cai Congcong, Li Xinyuan, Fan Hao, Chen Zhuo, Zhu Ting, Li Jiantao, Yu Ruohan, Li Tianyi, Hu Ping, Zhou LiangORCID
Abstract
AbstractLayered metal oxides are promising cathode materials for sodium-ion batteries (SIBs) due to their high theoretical specific capacity and wide Na+ diffusion channels. However, the irreversible phase transitions and cationic/anionic redoxes cause fast capacity decay. Herein, P2-type Na0.67Mg0.1Mn0.8Fe0.1O2 (NMMF-1) cathode material with moderate active Fe3+ doping has been designed for sodium storage. Uneven Mn3+/Mn4+distribution is observed in NMMF-1 and the introduction of Fe3+ is beneficial for reducing the Mn3+ contents both at the surface and in the bulk to alleviate the Jahn–Teller effect. The moderate Fe3+/Fe4+ redox can realize the best tradeoff between capacity and cyclability. Therefore, the NMMF-1 demonstrates a high capacity (174.7 mAh g−1 at 20 mA g−1) and improved cyclability (78.5% over 100 cycles) in a wide-voltage range of 1.5–4.5 V (vs. Na+/Na). In-situ X-ray diffraction reveals a complete solid-solution reaction with a small volume change of 1.7% during charge/discharge processes and the charge compensation is disclosed in detail. This study will provide new insights into designing high-capacity and stable layered oxide cathode materials for SIBs.
Funder
Independent Innovation Project of Hubei Longzhong Laboratory
Publisher
Springer Science and Business Media LLC
Subject
Economics, Econometrics and Finance (miscellaneous),Energy (miscellaneous),Environmental Science (miscellaneous)
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