Surface Engineering Stabilizes Rhombohedral Sodium Manganese Hexacyanoferrates for High‐Energy Na‐Ion Batteries

The rhombohedral sodium manganese hexacyanoferrate (MnHCF) only containing cheap Fe and Mn metals was regarded as a scalable, low‐cost, and high‐energy cathode material for Na‐ion batteries. However, the unexpected Jahn‐teller effect and significant phase transformation would cause Mn dissolution an...

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Bibliographic Details
Published in:Angewandte Chemie International Edition 2023-03, Vol.62 (13), p.e202217761-n/a
Main Authors: Xu, Chunliu, Ma, Yongzhi, Zhao, Junmei, Zhang, Peng, Chen, Zhao, Yang, Chao, Liu, Huizhou, Hu, Yong‐Sheng
Format: Article
Language:English
Subjects:
Batteries
Cathodes
Cathodic dissolution
CoxB Coating
Dissolution
Electrode materials
Heavy metals
High Energy Density
Iron
Life span
Lithium-ion batteries
Long Cycle Life
Manganese
Phase transitions
Rechargeable batteries
Rhombohedral Phase
Sodium
Sodium Manganese Hexacyanoferrate
Sodium-ion batteries
Structural stability
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Summary:The rhombohedral sodium manganese hexacyanoferrate (MnHCF) only containing cheap Fe and Mn metals was regarded as a scalable, low‐cost, and high‐energy cathode material for Na‐ion batteries. However, the unexpected Jahn‐teller effect and significant phase transformation would cause Mn dissolution and anisotropic volume change, thus leading to capacity loss and structural instability. Here we report a simple room‐temperature route to construct a magical CoxB skin on the surface of MnHCF. Benefited from the complete coverage and the buffer effect of CoxB layer, the modified MnHCF cathode exhibits suppressed Mn dissolution and reduced intergranular cracks inside particles, thereby demonstrating thousands‐cycle level cycling lifespan. By comparing two key parameters in the real energy world, i.e., cost per kilowatt‐hours and cost per cycle‐life, our developed CoxB coated MnHCF cathode demonstrates more competitive application potential than the benchmarking LiFePO4 for Li‐ion batteries. The sodium manganese hexacyanoferrate full‐cell configurations show comparable energy density to that of the well‐known LiFePO4 full cells.
ISSN:1433-7851
1521-3773
DOI:10.1002/anie.202217761