Removal of Interstitial H2O in Hexacyanometallates for a Superior Cathode of a Sodium-Ion Battery

被引:821
作者
Song, Jie [1 ,2 ]
Wang, Long [5 ]
Lu, Yuhao [5 ]
Liu, Jue [6 ]
Guo, Bingkun [1 ,2 ]
Xiao, Penghao [3 ,4 ]
Lee, Jong-Jan [5 ]
Yang, Xiao-Qing [7 ]
Henkelman, Graeme [3 ,4 ]
Goodenough, John B. [1 ,2 ]
机构
[1] Univ Texas Austin, Mat Sci & Engn Program, Austin, TX 78712 USA
[2] Univ Texas Austin, Texas Mat Inst, Austin, TX 78712 USA
[3] Univ Texas Austin, Dept Chem, Austin, TX 78712 USA
[4] Univ Texas Austin, Inst Computat & Engn Sci, Austin, TX 78712 USA
[5] Sharp Labs Amer, Camas, WA 98607 USA
[6] SUNY Stony Brook, Dept Chem, Stony Brook, NY 11794 USA
[7] Brookhaven Natl Lab, Dept Chem, Upton, NY 11973 USA
基金
美国能源部;
关键词
PRUSSIAN BLUE STRUCTURES; LONG CYCLE LIFE; LOW-COST; ELECTRODE MATERIALS;
D O I
10.1021/ja512383b
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Sodium is globally available, which makes a sodium-ion rechargeable battery preferable to a lithium-ion battery for large-scale storage of electrical energy, provided a host cathode for Na can be found that provides the necessary capacity, voltage, and cycle life at the prescribed charge/discharge rate. Low-cost hexacyanometallates are promising cathodes because of their ease of synthesis and rigid open framework that enables fast Na+ insertion and extraction. Here we report an intriguing effect of interstitial H2O on the structure and electrochemical properties of sodium manganese(II) hexacyanoferrates(II) with the nominal composition Na2MnFe(CN)(6)(.)zH(2)O (Na-2-delta MnHFC). The newly discovered dehydrated Na2-delta MnHFC phase exhibits superior electrochemical performance compared to other reported Na-ion cathode materials; it delivers at 3.5 V a reversible capacity of 150 mAh g(-1) in a sodium half cell and 140 mAh g(-1) in a full cell with a hard-carbon anode. At a charge/discharge rate of 20 C, the half-cell capacity is 120 mAh g(-1), and at 0.7 C, the cell exhibits 75% capacity retention after 500 cycles.
引用
收藏
页码:2658 / 2664
页数:7
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