Size-, Water-, and Defect-Regulated Potassium Manganese Hexacyanoferrate with Superior Cycling Stability and Rate Capability for Low-Cost Sodium-Ion Batteries

被引:118
|
作者
Zhou, Aijun [1 ,2 ]
Xu, Zemin [1 ]
Gao, Hongcai [2 ]
Xue, Leigang [2 ]
Li, Jingze [1 ]
Goodenough, John B. [2 ]
机构
[1] Univ Elect Sci & Technol China, Sch Mat & Energy, Chengdu 610054, Sichuan, Peoples R China
[2] Univ Texas Austin, Texas Mat Inst, Austin, TX 78712 USA
关键词
cathode; cointercalation; potassium manganese hexacyanoferrate; Prussian blue; sodium-ion batteries; PRUSSIAN BLUE ANALOGS; CATHODE MATERIALS; ELECTROCHEMICAL PROPERTIES;
D O I
10.1002/smll.201902420
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Potassium manganese hexacyanoferrate (KMHCF) is a low-cost Prussian blue analogue (PBA) having a rigid and open framework that can accommodate large alkali ions. Herein, the synthesis of KMHCF and its application as a high-performance cathode in sodium-ion batteries (NIBs) is reported. High-quality KMHCF with low amounts of crystal water and defects and with homogeneous microstructure is obtained by controlling the nucleation and grain growth by using a high-concentration citrate solution as a precipitation medium. The obtained KMHCF exhibits superior cycling and rate performance as a NIB cathode, showing 80% capacity retention after 1000 cycles at 1 C and a high capacity of 95 mA h g(-1) at 20 C. Unlike conventional single-cation batteries, the hybrid NIB with KMHCF as cathode and Na as anode in Na-ion electrolyte displays three reversible plateaus that involve stepwise insertion/extraction of both K+ and Na+ in the PBA framework. In later cycling, the K+-Na+ cointercalated phase is partially converted into a cubic sodium manganese hexacyanoferrate (NaMHCF) phase due to the increasing replacement of Na+ for K+.
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页数:6
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