Coordination engineering for iron-based hexacyanoferrate as a high-stability cathode for sodium-ion batteries

• 成果类型: Article
• 署名作者: Zhong, Jiang; Xia, Lirong; Chen, Song; Zhang, Zhengwei; Pei, Yong; Chen, Hao; Sun, Hongtao; Zhu, Jian; Lu, Bingan; Zhang, Yinghe
• 署名单位: Hunan University; Xiangtan University; Central South University; Pennsylvania Commonwealth System of Higher Education (PCSHE); Pennsylvania State University; Pennsylvania State University - University Park; Hunan University; Harbin Institute of Technology
• 刊物名称: PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
• ISSN/ISSBN: 0027-15141
• DOI: 10.1073/pnas.2319193121
• 发表日期: 2024-07-30
• 关键词: prussian blue analogs; initio molecular-dynamics; DESIGN; oxide

摘要

Iron- based hexacyanoferrate (Fe-HCF) are promising cathode materials for sodium- ion batteries (SIBs) due to their unique open- channel structure that facilitates fast ion transport and framework stability. However, practical implementation of SIBs has been hindered by low initial Coulombic efficiency (ICE), poor rate performance, and short lifespan. Herein, we report a coordination engineering to synthesize sodium- rich Fe-HCF as cathodes for SIBs through a uniquely designed 10- kg- scale chemical reactor. Our study systematically investigated the relationship between coordination surroundings and the electrochemical behavior. Building on this understanding, the cathode delivered a reversible capacity of 99.3 mAh g -1 at 5 C (1 C = 100 mA g-1), exceptional rate capability (51 mAh g -1 even at 100 C), long lifespan (over 15,000 times at 50 C), and a high ICE of 92.7%. A full cell comprising the Fe-HCF cathode and hard carbon (HC) anode exhibited an impressive cyclic stability with a high- capacity retention rate of 98.3% over 1,000 cycles. Meanwhile, this material can be readily scaled to the practical levels of yield. The findings underscore the potential of Fe-HCF as cathodes for SIBs and highlight the significance of controlling nucleation and morphology through coordination engineering for a sustainable energy storage system.