电解质
阳极
介电谱
材料科学
阴极
电化学
电导率
水溶液
溶解
离子
离子电导率
电化学窗口
化学工程
分析化学(期刊)
化学
电极
物理化学
色谱法
有机化学
工程类
作者
Fu‐Da Yu,Zhe-Jian Yi,R.-T. Li,Wei-Hao Lin,Jie Chen,Xiaoyue Chen,Yiming Xie,Jihuai Wu,Jihuai Wu,Lan‐Fang Que,Baosheng Liu,Hao Luo,Qian Wang
标识
DOI:10.1016/j.jechem.2023.12.019
摘要
It is challenging for aqueous Zn-ion batteries (ZIBs) to achieve comparable low-temperature (low-T) performance due to the easy-frozen electrolyte and severe Zn dendrites. Herein, an aqueous electrolyte with a low freezing point and high ionic conductivity is proposed. Combined with molecular dynamics simulation and multi-scale interface analysis (time of flight secondary ion mass spectrometry three-dimensional mapping and in-situ electrochemical impedance spectroscopy method), the temperature independence of the V2O5 cathode and Zn anode is observed to be opposite. Surprisingly, dominated by the solvent structure of the designed electrolyte at low temperatures, vanadium dissolution/shuttle is significantly inhibited, and the zinc dendrites caused by this electrochemical crosstalk are greatly relieved, thus showing an abnormal temperature inversion effect. Through the disclosure and improvement of the above phenomena, the designed Zn||V2O5 full cell delivers superior low-T performance, maintaining almost 99% capacity retention after 9500 cycles (working more than 2500 h) at −20 °C. This work proposes a kind of electrolyte suitable for low-T ZIBs and reveals the inverse temperature dependence of the Zn anode, which might offer a novel perspective for the investigation of low-T aqueous battery systems.
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