锰
电解质
阳极
锌
水溶液
计时安培法
腐蚀
电偶阳极
扫描电子显微镜
化学
明胶
枝晶(数学)
电化学
无机化学
材料科学
电池(电)
化学工程
冶金
电极
有机化学
循环伏安法
复合材料
阴极保护
功率(物理)
物理化学
工程类
物理
量子力学
数学
几何学
作者
Yu Liu,Qiuyu Shi,Yan Wu,Quan Wang,Jing Huang,Pu Chen
标识
DOI:10.1016/j.cej.2020.127189
摘要
Metallic Zn anode in aqueous rechargeable batteries generally suffers from corrosion and dendrite formation. In this work, these issues can be tackled by using synergistic effect of Mn2+ ions and gelatin as additives. The dendrite suppression was characterized by scanning electron microscopy and chronoamperometry examinations. It was found that the 0.2 M Mn2+ and 0.5 wt% gelatin in the electrolyte are beneficial to mitigate both dendrite growth and corrosion. Ex situ X-ray diffraction results suggested that the presence of Mn2+ ions during zinc depositing process changes the preferred zinc orientation from the (1 1 2) plane to (1 0 3) and (0 0 2) planes, which are not prone to zinc dendrite growth. The Zn//Zn symmetric cells revealed that the coexistence of Mn2+ ions and gelatin greatly increase the sand’s time (>500 h) of zinc dendrite formation. The assembled Zn//polyaniline/MnO2 battery using Mn2+/gelatin co-added electrolyte demonstrated good capacity retention of 80% after 1000 repeated cycles at 500 mAg−1. Furthermore, float charge current also obviously decreased from approximately 11.8 to 4.3 ~ 7.6 μA under 1.9 V constant voltage.
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