Aqueous K-ion batteries (AKIBs) are promising candidates for grid-scale energy storage due to their inherent safety and low cost. However, full AKIBs have not yet been reported due to the limited availability of suitable electrodes and electrolytes. Here we propose an AKIB system consisting of an Fe-substituted Mn-rich Prussian blue KxFeyMn1 − y[Fe(CN)6]w·zH2O cathode, an organic 3,4,9,10-perylenetetracarboxylic diimide anode and a 22 M KCF3SO3 water-in-salt electrolyte. The cathode achieves 70% capacity retention at 100 C and a lifespan of over 10,000 cycles due to the mitigation of phase transitions by Fe substitution. Meanwhile, the electrolyte can help decrease the dissolution of both electrodes owing to the lack of free water. The AKIB exhibits a high energy density of 80 Wh kg−1 and can operate well at rates of 0.1–20 C and over a wide temperature range (−20 to 60 °C). We believe that our demonstration could pave the way for practical applications of AKIBs for grid-scale energy storage.
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This work was supported by the National Natural Science Foundation of China (51725206 and 51421002), the National Key Technologies R&D Programme of China (2016YFB0901500), and the Strategic Priority Research Programme of the Chinese Academy of Sciences (XDA21070500), the Strategic Priority Research Programme of the Chinese Academy of Sciences (XDA21070500) and the Beijing Municipal Science and Technology Commission (Z181100004718008).
Supplementary Figs. 1–14, Supplementary Note 1, Supplementary Tables 1–9 and supplementary references
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Nature Energy (2019)