阳极
锌
锰
材料科学
法拉第效率
水溶液
电偶阳极
金属
离子
化学工程
无机化学
水溶液中的金属离子
电极
化学
冶金
有机化学
阴极保护
物理化学
工程类
作者
Yu Liu,Qingping Li,Xiaoqin Zhang,Yingxia Dong,Heng Cao,Xiaomin Huang,Yuanxia Li,Qiaoji Zheng,Jingxin Zhao,Dunmin Lin
标识
DOI:10.1016/j.ceramint.2023.06.026
摘要
Zinc (Zn) metal, as a promising anode for aqueous zinc-ion batteries (AZIBs), has attracted much attention owing to its reasonable redox potential and fabulous theoretical capacity. Notwithstanding, Zn dendrites and side reactions generated during charging/discharging seriously inhibit the reversibility of Zn anode of AZIBs. Herein, ultra-long manganese dioxide (MnO2) nanowires with low cost and easy synthesis have been designed as a high-efficiency zinc ion shunt to achieve uniform Zn deposition. The Zn coated with MnO2 protection layer possesses good water wettability, high ionic conductivity (1.3 mS cm−1) and low activation energy (38.2 kJ mol−1). As a result, the Zn@MnO2||Zn@MnO2 symmetric cell exhibits an ultra-long lifespan over 3800 h at 0.5 mA cm−2/0.25 mAh cm−2; for the Zn@MnO2||Zn@MnO2 symmetric cell, the accumulative discharge capacity surpasses 1600 mAh cm−2 and the depth of discharge (DOD) is 34.2% at the harsh conditions of 20 mA cm−2/20 mAh cm−2; and the average coulombic efficiency (CE) of the Zn//Cu@MnO2 asymmetric cell achieves 99.6%. In addition, the Zn@MnO2//NVO full cell possesses an excellent reversible discharge capacity of 176.3 mAh g−1 after 1000 cycles at 2 A g−1. This investigation provides a useful reference for designing high-efficiency zinc ion shunt to realize highly reversible Zn anode for AZIBs.
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