Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 35    No. 9    September 2025

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Preparation, electrochemical properties and energy storage mechanism of vanadium-based Prussian blue analogues as cathode materials for aqueous ammonium ion batteries
Tao-tao LI1, Jin-peng QU1, Lu-lu ZHAO1, Peng-fei WANG1, Jun-hong ZHANG2, Ting-feng YI1,3

1. School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China;
2. Shandong Provincial Key Laboratory of Chemical Energy Storage and Novel Cell Technology, College of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng 252059, China;
3. Key Laboratory of Dielectric and Electrolyte Functional Materials of Hebei Province, School of Resources and Materials, Northeastern University at Qinhuangdao, Qinhuangdao 066004, China

Abstract:To explore high-performance cathode materials for aqueous ammonium ion batteries (AAIBs), vanadium- based Prussian blue analogue composites (VFe-PBAs) were prepared by hydrothermal coprecipitation method to enhance the reversible storage of NH4+. Benefiting from the stable three-dimensional structure and spacious gap position, VFe-PBAs-2 cathode displays excellent electrochemical activity and rate performance, achieving a high specific capacity of 84.3 mA·h/g at a current density of 1000 mA/g. In addition, VFe-PBAs-2 cathode also shows impressive long-term cycle durability with 85.2% capacity retention after 3×104 cycles at 5000 mA/g. The synthesized cathode materials combined with the high electrochemical activity of vanadium ions significantly promote the rapid transfer of NH4+. Furthermore, NH4+ embedding/extraction mechanism of VFe-PBAs-2 cathode was revealed by electrochemical kinetics tests and advanced ex-situ characterizations. The experimental results demonstrate that vanadium-modified VFe-PBAs-2 as a cathode material can remarkably improve the capacity, electrochemical activity and cycling stability of AAIBs to achieve high performance NH4+ storage.

 

Key words: energy storage; aqueous ammonium ion battery; Prussian blue analogues; rate performance; cycling stability

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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