Mixed ether-based solvents provide a long cycle life with high rate capability to graphite anodes for Na-ion batteries
Literature Information
Tetsuya Kajita, Takashi Itoh
Energy storage devices using sodium ions have great potential in terms of their low cost, high power, and long life. In particular, there could be a significant cost reduction, because of the abundant resource of sodium. Recently, electro-chemical sodium storage performance has been demonstrated in graphite anodes using ether-based solvents. However, the high power and long life were not compatible in the same ether solution. Here, we demonstrated using mixed ether-based solvents that a long cycle life and high rate capability can coexist in the graphite anodes for sodium-ion batteries. The cycle performance indicated that the discharge capacity retention ratio after 10ā000 cycles was more than 90% and the capability of 4 A gā1/0.2 A gā1 (40C/2C) was more than 75%. These results could advance the development of sodium storage devices for practical use.
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