Journal
SMALL METHODS
Volume 3, Issue 4, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smtd.201800220
Keywords
aqueous batteries; concentrated electrolytes; high voltage; Prussian blue; sodium-ion batteries
Funding
- Ministry of Education, Culture, Sports, Science and Technology, Japan (MEXT)
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High discharge voltage of more than 2 V is achieved in a novel aqueous sodium-ion battery with the combination of a Prussian blue-type sodium manganese hexacyanoferrate cathode, and a similar potassium manganese hexacyanochromate anode. Here, a highly concentrated sodium perchlorate aqueous electrolyte with a 2.8 V electrochemical window is used. By element analysis, the novel anode containing little potassium element possibly serves as a suitable host-guest anode, similarly as the cathode extracting/inserting sodium ion in a highly concentrated sodium-ion aqueous electrolyte. Open-framework electrodes and a highly concentrated but mobile aqueous electrolyte contribute to high voltage and high rate performance of the aqueous sodium-ion battery.
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