A Stress Self‐Adaptive Structure to Suppress the Chemo‐mechanical Degradation for High Rate and Ultralong Cycle Life Sodium Ion Batteries

Transition‐metal phosphides (TMPs) as typical conversion‐type anode materials demonstrate extraordinary theoretical charge storage capacity for sodium ion batteries, but the unavoidable volume expansion and irreversible capacity loss upon cycling represent their long‐standing limitations. Herein we...

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Bibliographic Details
Published in:Angewandte Chemie International Edition 2023-07, Vol.62 (29), p.e202303875-n/a
Main Authors: Liu, Yiming, Wang, Jing, Shi, Qinhao, Yan, Mouhui, Zhao, Shengyu, Feng, Wuliang, Qi, Ruijuan, Xu, Jiaqiang, Luo, Jiayan, Zhang, Jiujun, Zhao, Yufeng
Format: Article
Language:English
Subjects:
Anodes
Batteries
Carbon
Degradation
Electrode materials
Iron Phosphide
Long Cycle Life
Phosphides
Quantum dots
Smart structures
Sodium
Sodium Ion Battery
Sodium-ion batteries
Specific capacity
Storage capacity
Stress Transfer
Ultrafines
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Summary:Transition‐metal phosphides (TMPs) as typical conversion‐type anode materials demonstrate extraordinary theoretical charge storage capacity for sodium ion batteries, but the unavoidable volume expansion and irreversible capacity loss upon cycling represent their long‐standing limitations. Herein we report a stress self‐adaptive structure with ultrafine FeP nanodots embedded in dense carbon microplates skeleton (FeP@CMS) via the spatial confinement of carbon quantum dots (CQDs). Such an architecture delivers a record high specific capacity (778 mAh g−1 at 0.05 A g−1) and ultra‐long cycle stability (87.6 % capacity retention after 10 000 cycles at 20 A g−1), which outperform the state‐of‐the‐art literature. We decode the fundamental reasons for this unprecedented performance, that such an architecture allows the spontaneous stress transfer from FeP nanodots to the surrounding carbon matrix, thus overcomes the intrinsic chemo‐mechanical degradation of metal phosphides. In this work, we report a novel architecture with FeP nanodots fully embedded in nitrogen doped carbon microplates skeleton (FeP@CMS) via the spatial confinement of carbon quantum dots (CQDs) . Such a structure allows the stress transfer between FeP nanodots and self‐adaptive carbon matrix in sodium storage, which overcomes the intrinsic chemo‐mechanical degradation of metal phosphides during long‐term cycling.
ISSN:1433-7851
1521-3773
DOI:10.1002/anie.202303875