Iron hexacyanoferrate (FeHCF) is a promising cathode material for sodium-ion batteries.However,FeHCF always suffers from a poor cycling stability,which is closely related to the abundant vacancy defects in its framework.Herein,post-synthetic and in-situ vacancy repairing strategies are proposed for the synthesis of high-quality FeHCF in a highly concentrated Na4Fe(CN)6 solution.Both the post-synthetic and in-situ vacancy repaired FeHCF products (FeHCF-P and FeHCF-I) show the significant decrease in the number of vacancy defects and the reinforced structure,which can suppress the side reac-tions and activate the capacity from low-spin Fe in FeHCF.In particu-lar,FeHCF-P delivers a reversible discharge capacity of 131 mAh g-1 at 1 C and remains 109 mAh g-1 after 500 cycles,with a capacity reten-tion of 83％.FeHCF-I can deliver a high discharge capacity of 158.5 mAh g-1 at 1 C.Even at 10 C,the FeHCF-I electrode still maintains a discharge specific capacity of 103 mAh g-1 and retains 75％ after 800 cycles.This work provides a new vacancy repairing strategy for the solution synthesis of high-quality FeHCF.

Min Wan;Rui Zeng;Jingtao Meng;Zexiao Cheng;Weilun Chen;Jiayu Peng;Wuxing Zhang;Yunhui Huang

School of Mechanical Science and Engineering,Huazhong University of Science and Technology,Wuhan 430074,People's Republic of China;School of Chemistry and Environmental Engineering,Wuhan Polytechnic University,Wuhan 430023,People's Republic of China;State Key Laboratory of Materials Processing and Die & Mould Technology,School of Materials Science and Engineering,Huazhong University of Science and Technology,Wuhan 430074,People's Republic of China

纳微快报（英文）

[1]Min Wan;Rui Zeng;Jingtao Meng;Zexiao Cheng;Weilun Chen;Jiayu Peng;Wuxing Zhang;Yunhui Huang-.Post-Synthetic and In Situ Vacancy Repairing of Iron Hexacyanoferrate Toward Highly Stable Cathodes for Sodium-Ion Batteries)[J].纳微快报（英文）,2022(01):182-193

Hexacyanoferrate,Na4Fe

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