Sodium storage in Na-rich NaxFeFe (CN)6 nanocubes

被引：311

作者：

Liu, Yang ^{[1
,2
]}

Qiao, Yun ^{[1
,2
]}

Zhang, Wuxing ^{[1
]}

Li, Zhen ^{[1
]}

Ji, Xiao ^{[3
]}

Miao, Ling ^{[3
]}

Yuan, Lixia ^{[1
]}

Hu, Xianluo ^{[1
]}

Huang, Yunhui ^{[1
]}

机构：

[1] Huazhong Univ Sci & Technol, Sch Mat Sci & Engn, State Key Lab Mat Proc & Die & Mould Technol, Wuhan 430074, Hubei, Peoples R China

[2] Henan Normal Univ, Sch Chem & Chem Engn, Xinxiang 453007, Henan, Peoples R China

[3] Huazhong Univ Sci & Technol, Sch Opt & Elect informat, Wuhan 430074, Hubei, Peoples R China

来源：

NANO ENERGY | 2015年 / 12卷

关键词：

Sodium-ion batteries; NaxFeFe(CN)(6) cathode; Nanocubes; First-principle theory; Sodium storage mechanism; PRUSSIAN BLUE; ION BATTERIES; CATHODE MATERIALS; SHELL NANOPARTICLES; ANODE MATERIALS; ENERGY-STORAGE; LOW-COST; HEXACYANOFERRATE; FRAMEWORK; INSERTION;

D O I：

10.1016/j.nanoen.2015.01.012

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Na-rich prussian blue analogues (PBS) with high coulombic efficiency are of fundamental and technological importance for sodium-ion batteries (SIBs). Here we report high-quality NaxFeFe(CN)(6) nanocubes as cathode materials for SIBs and investigate their sodium storage mechanism. Among them, Na-rich Na1.70FeFe(CN)(6) shows highly reversible electrochemical reactions, delivering a capacity as high as 120.7 mA h g(-1) at a current density of 200 mA g(-1); even at 1200 mA g(-1), the capacity still retains up to 73.6 mA h g (1). The first-cycle coulombic efficiency strongly depends on the sodium content in NxFeFe(CN)(6). Experimental results and first-principle calculations demonstrate that sodium cations in the large cavities of PBs have a priority to occupy the 8c site, while in the Na-rich samples, Na ions can be pushed into other 24d site. We believe that our findings can provide new insights into sodium storage mechanism for the PBs. (C) 2015 Elsevier Ltd. All rights reserved.

引用

页码：386 / 393

页数：8

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