Dual ion batteries (DIBs) have recently attracted ever-increasing attention owing to the potential advantages of low material cost and good environmental friendliness. However, the potential safety hazards, cost, and environmental concerns mainly resulted from the commonly used nonaqueous organic solvents severely hinder the practical application of DIBs. Herein, a hybrid aqueous/nonaqueous water-in-bisalt electrolyte with both broad electrochemical stability window and excellent safety performance is developed. The lithium-based DIB assembled using KS6 graphite and niobium pentoxide as the active materials in the cathode and anode exhibits good comprehensive performance including capacity, cycling stability, rate performance, and medium discharge voltage. Initial capacities of ≈47.6 and 29.6 mAh g-1 retention after 300 cycles can be delivered with a medium discharge voltage of around 2.2 V in the voltage window of 0-3.2 V at the current density of 200 mA g-1 . Good rate performance for the battery can be indicated by 29.7 mAh g-1 discharge capacity retention at 400 mA g-1 . It is noteworthy that the coulombic efficiency of the battery can reach as high as 93.9%, which is comparable to that of the corresponding DIBs using nonaqueous organic electrolytes.

中文翻译：

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混合水/非水玄武岩水电解质可实现安全的双离子电池。

由于低廉的材料成本和良好的环境友好性的潜在优势，双离子电池（DIB）最近引起了越来越多的关注。但是，潜在的安全隐患，成本和环境问题主要是由常用的非水有机溶剂引起的，严重阻碍了DIB的实际应用。在本文中，开发了既具有宽的电化学稳定性窗口又具有优异的安全性能的混合水/非水双盐复合水电解质。在正极和负极中使用KS6石墨和五氧化二铌作为活性材料组装而成的锂基DIB具有良好的综合性能，包括容量，循环稳定性，倍率性能和中等放电电压。初始容量约为47.6和29。在200 mA g-1的电流密度下，可在0-3.2 V的电压窗口中以2.2 V左右的中等放电电压传送300次循环后6 mAh g-1的保留时间。电池的良好倍率性能可以通过在400 mA g-1下保持29.7 mAh g-1的放电容量来表明。值得注意的是，电池的库仑效率可高达93.9％，与使用非水有机电解质的相应DIB的库仑效率相当。