电解质
电化学
水溶液
电极
电导率
化学工程
盐(化学)
材料科学
无机化学
化学
有机化学
物理化学
工程类
作者
Nan Lv,Ruiqi Ren,Yulin Wu,Zikang Xu,Dixian Wu,Xiangyu You,Guoyin Zhu,Yizhou Zhang,Shengyang Dong
标识
DOI:10.1016/j.electacta.2022.141097
摘要
High-concentration electrolytes have been proven to be an effective strategy to improve the electrochemical performance of aqueous batteries. However, dramatically increasing the salt concentration will leads to high cost, high viscosity, and low conductivity. Here, we propose an ultralow-low concentration electrolyte of 1 mM H2SO4 solution for the practical application of aqueous batteries for the first time. Surprisingly, the (NH4)0.5V2O5 (NVO) achieves good electrochemical performance benefitting from the special Grotthuss mechanism of proton and structural stability of electrode material in dilute acidic electrolyte. The NVO electrode exhibits a high reversible capacity of about 150 mAh g−1 at a low current density of 50 mA g−1 and impressive capacity retention of 80% over 70,000 cycles at 2 A g−1. The low concentration electrolyte chemistry will open a novel route for the exploitation of durable and low-cost aqueous batteries.
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