Ti-substituted tunnel-type Na0.44MnO2 oxide as a negative electrode for aqueous sodium-ion batteries

The aqueous sodium-ion battery system is a safe and low-cost solution for large-scale energy storage, because of the abundance of sodium and inexpensive aqueous electrolytes. Although several positive electrode materials, for example, Na 0.44 MnO 2 , were proposed, few negative electrode materials,...

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Published in:Nature communications 2015-03, Vol.6 (1), p.6401-6401
Main Authors: Wang, Yuesheng, Liu, Jue, Lee, Byungju, Qiao, Ruimin, Yang, Zhenzhong, Xu, Shuyin, Yu, Xiqian, Gu, Lin, Hu, Yong-Sheng, Yang, Wanli, Kang, Kisuk, Li, Hong, Yang, Xiao-Qing, Chen, Liquan, Huang, Xuejie
Format: Article
Language:English
Subjects:
639/301/299/891
639/638/440
Activated carbon
Aqueous electrolytes
Aqueous solutions
Crystal structure
Electrode materials
Electrodes
Electrolytes
ENERGY STORAGE
Humanities and Social Sciences
Laboratories
Lithium
Manganese dioxide
Materials substitution
Microscopy
multidisciplinary
Rechargeable batteries
Science
Science (multidisciplinary)
Sodium
Sodium-ion batteries
Substitution reactions
Titanium
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Summary:The aqueous sodium-ion battery system is a safe and low-cost solution for large-scale energy storage, because of the abundance of sodium and inexpensive aqueous electrolytes. Although several positive electrode materials, for example, Na 0.44 MnO 2 , were proposed, few negative electrode materials, for example, activated carbon and NaTi 2 (PO 4 ) 3 , are available. Here we show that Ti-substituted Na 0.44 MnO 2 (Na 0.44 [Mn 1-x Ti x ]O 2 ) with tunnel structure can be used as a negative electrode material for aqueous sodium-ion batteries. This material exhibits superior cyclability even without the special treatment of oxygen removal from the aqueous solution. Atomic-scale characterizations based on spherical aberration-corrected electron microscopy and ab initio calculations are utilized to accurately identify the Ti substitution sites and sodium storage mechanism. Ti substitution tunes the charge ordering property and reaction pathway, significantly smoothing the discharge/charge profiles and lowering the storage voltage. Both the fundamental understanding and practical demonstrations suggest that Na 0.44 [Mn 1-x Ti x ]O 2 is a promising negative electrode material for aqueous sodium-ion batteries. Aqueous sodium-ion batteries could be a potential solution for large-scale energy storage, but the conventional negative electrodes are not efficient. Here, the authors report a titanium-substituted tunnel-type Na 0.44 MnO 2 material as a promising negative electrode for aqueous sodium-ion batteries.
ISSN:2041-1723
2041-1723
DOI:10.1038/ncomms7401