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Title: A novel high capacity positive electrode material with tunnel-type structure for aqueous sodium-ion batteries

In this study, aqueous sodium-ion batteries have shown desired properties of high safety characteristics and low-cost for large-scale energy storage applications such as smart grid, because of the abundant sodium resources as well as the inherently safer aqueous electrolytes. Among various Na insertion electrode materials, tunnel-type Na0.44MnO2 has been widely investigated as a positive electrode for aqueous sodium-ion batteries. However, the low achievable capacity hinders its practical applications. Here we report a novel sodium rich tunnel-type positive material with a nominal composition of Na0.66[Mn0.66Ti0.34]O2. The tunnel-type structure of Na0.44MnO2 obtained for this compound was confirmed by XRD and atomic-scale STEM/EELS. When cycled as positive electrode in full cells using NaTi2(PO4)3/C as negative electrode in 1M Na2SO4 aqueous electrolyte, this material shows the highest capacity of 76 mAh g-1 among the Na insertion oxides with an average operating voltage of 1.2 V at a current rate of 2C. These results demonstrate that Na0.66[Mn0.66Ti0.34]O2 is a promising positive electrode material for rechargeable aqueous sodium-ion batteries.
Authors:
 [1] ;  [1] ;  [2] ;  [1] ;  [2] ;  [3] ;  [1] ;  [1] ;  [2] ;  [1] ;  [1]
  1. Chinese Academy of Sciences (CAS), Beijing (China)
  2. Brookhaven National Lab. (BNL), Upton, NY (United States)
  3. Collaborative Innovation Center of Quantum Matter, Beijing (China); Chinese Academy of Sciences (CAS), Beijing (China)
Publication Date:
OSTI Identifier:
1214527
Report Number(s):
BNL--108337-2015-JA
Journal ID: ISSN 1614-6840; VT1201000
Grant/Contract Number:
SC00112704
Type:
Accepted Manuscript
Journal Name:
Advanced Energy Materials (Online)
Additional Journal Information:
Journal Name: Advanced Energy Materials (Online); Journal ID: ISSN 1614-6840
Publisher:
Wiley
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
Country of Publication:
United States
Language:
English
Subject:
25 ENERGY STORAGE; 36 MATERIALS SCIENCE National Synchrotron Light Source; aqueous sodium ion battery; energy storage; positive electrode; tunnel-type structure