Volume 137, Issue 22 e202500254
Forschungsartikel

Enhancing the Reversibility and Kinetics of Heterovalent Ion-Substituted Mn-Based Prussian Blue Analogue Cathodes via Intervalence Charge Transfer

Lingtong Kong

Lingtong Kong

Key Laboratory of Special Functional Aggregated Materials (Ministry of Education), School of Chemistry and Chemical Engineering, Shandong University, Jinan, Shandong, 250100 P. R. China

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Zhongxin Jing

Zhongxin Jing

Key Laboratory of Special Functional Aggregated Materials (Ministry of Education), School of Chemistry and Chemical Engineering, Shandong University, Jinan, Shandong, 250100 P. R. China

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Muhammad Mamoor

Muhammad Mamoor

Key Laboratory of Special Functional Aggregated Materials (Ministry of Education), School of Chemistry and Chemical Engineering, Shandong University, Jinan, Shandong, 250100 P. R. China

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Yifan Jiang

Yifan Jiang

Key Laboratory of Special Functional Aggregated Materials (Ministry of Education), School of Chemistry and Chemical Engineering, Shandong University, Jinan, Shandong, 250100 P. R. China

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Yanjun Zhai

Yanjun Zhai

Shandong Provincial Key Laboratory of Chemical Energy Storage and Novel Cell Technology, and School of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng, 252000 P. R. China

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Guangmeng Qu

Guangmeng Qu

Key Laboratory of Special Functional Aggregated Materials (Ministry of Education), School of Chemistry and Chemical Engineering, Shandong University, Jinan, Shandong, 250100 P. R. China

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Lu Wang

Lu Wang

Key Laboratory of Special Functional Aggregated Materials (Ministry of Education), School of Chemistry and Chemical Engineering, Shandong University, Jinan, Shandong, 250100 P. R. China

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Bin Wang

Bin Wang

Key Laboratory of Special Functional Aggregated Materials (Ministry of Education), School of Chemistry and Chemical Engineering, Shandong University, Jinan, Shandong, 250100 P. R. China

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Liqiang Xu

Corresponding Author

Liqiang Xu

Key Laboratory of Special Functional Aggregated Materials (Ministry of Education), School of Chemistry and Chemical Engineering, Shandong University, Jinan, Shandong, 250100 P. R. China

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First published: 27 February 2025

Abstract

Mn3+ (d4) in manganese-based Prussian blue analogues (MnPBA) exhibits intrinsic orbital degeneracy upon sodiation/desodiation, resulting in severe Jahn–Teller distortion, which usually causes rapid capacity decay and sluggish kinetics. Unfortunately, traditional modification strategies are insufficient for electronic tuning of Mn3+ to mitigate these issues. Herein, Intervalence Charge Transfer (IVCT) of manganese and iron to vanadium ions is unraveled in a series of novel V3+-substituted MnPBA to enhance electrochemical reaction reversibility and kinetics. IVCT drives electron distribution from localized to delocalized, achieves electronic coupling, and mitigates Jahn–Teller by transferring a single-electron of Mn3+ eg orbital. Notably, the reported Na1.2V0.63Mn0.58Fe(CN)6 cathode demonstrates excellent rate capability (136.9 mAh g−1 at 20 mA g−1 and 94.9 mAh g−1 at 20 A g−1), remarkable long-cycle stability (91.6 % capacity retention after 300 cycles at 20 mA g−1 and 90.7 % after 2000 cycles at 2 A g−1), and robust performance across a wide temperature range (98.59 % capacity after 300 cycles at −30 °C and 50 mA g−1), surpassing the majority of reported sodium-ion cathodes. The intrinsic functioning mechanism of IVCT and quasi-zero-strain reaction mechanism were adequately understood through systematic in situ/ex situ characterizations. This study further develops electron-tuning of PBA, opening a new avenue toward advanced sodium-ion battery cathode materials.

Conflict of Interests

The authors declare no competing financial 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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