电解质
两亲性
水溶液
溶解
电化学窗口
材料科学
电池(电)
储能
电化学
电压
开路电压
化学工程
化学
纳米技术
离子电导率
电极
有机化学
电气工程
共聚物
物理化学
复合材料
物理
功率(物理)
工程类
量子力学
聚合物
作者
Jie Wei,Pengbo Zhang,Yuzhu Liu,Minghua Zhu,Tengfei Dai,Zuoxiu Tie,Zhong Jin
标识
DOI:10.1016/j.cej.2023.141623
摘要
Aqueous potassium-ion batteries (AKIBs) are promising candidates for large-scale energy storage. However, the performance of AKIBs is restricted the dissolution of electrode materials and the narrow voltage window of aqueous electrolytes. Herein, we report the amphiphilic supramolecule modified aqueous K-ion electrolytes with synergistic functions of excluded-volume effect and hydrogen bond networks, which greatly reduce the activity of water molecules, inhibit the dissolution of active materials, and expand the operation voltage window (>3.4 V). Moreover, the as-assembled full-cell AKIBs exhibit an open-circuit voltage of 2.0 V, good rate capability, wide operating temperature range (−20 to 90 °C), and ultralong cycling life (with a capacity retention of 97.8 % after 10,000 cycles at 10 C). The study makes it possible for aqueous electrolytes to possess wide voltage window and temperature endurance, greatly expanding the choices of practicable electrolyte and paving the way of high-voltage aqueous batteries towards sustainable, safety and low-cost energy storage.
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