期刊
CHEMISTRY OF MATERIALS
卷 29, 期 8, 页码 3597-3602出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.chemmater.7b00226
关键词
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资金
- Ministry of Education, Culture, Sports, Science and Technology, Japan (MEXT) under Element Strategy Initiative for Catalysts and Batteries (ESICB) project
- KEK-PF [2015G684]
As an efficient rechargeable power source, lithium-ion batteries have dominated the consumer electronics and electric vehicle markets. Their analogues, sodium-ion batteries, are emerging as promising low-cost candidates for grid electricity storage. In the pursuit of better cathode materials for Li/Na-ion batteries, major design strategies have involved cation engineering, as represented by studies on mixed transition metals and/or Li/Na-rich layered oxides. Instead of focusing on the cation, here, we report an effective anion engineering strategy that allowed us to identify a surprisingly wide range of polyanionic complete solid solutions of alluaudite-type NaxFey(PO4)(3-z)(SO4)(z) (0 <= z <= 3). These materials exhibited tunable voltage and superior capacities, depending on the mixing ratio of the two polyanions. The existence of a continuous, wide compositional domain in a mixed-polyanion system will significantly enrich materials design strategies and contribute to the development of new cathode materials for Li/Na-ion batteries.
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