电解质
电化学
阳极
电极
硫黄
分子
无机化学
水溶液
材料科学
化学
化学工程
有机化学
冶金
物理化学
工程类
作者
Weihao Song,Jiaxing Liu,S. Srinivasa Rao,Ming Zhao,Yanqun Lv,Shunshun Zhao,Qian Ma,Wu Bo,Chengjin Zheng,Shimou Chen,Zhilin Li,Jin Niu,Feng Wang
标识
DOI:10.1002/advs.202400094
摘要
Numerous organic electrolytes additives have been reported to improve Zn anode performance in aqueous Zn metal batteries (AZMBs). However, the modification mechanism needs to be further revealed in consideration of different environments for electrolytes and electrodes during the charge-discharge process. Herein, sulfur-containing zwitter-molecule (methionine, Met) is used as an additive for ZnSO4 electrolytes. In electrolytes, Met reduces the H2 O coordination number and facilitates the desolvation process by virtue of functional groups (─COOH, ─NH2 , C─S─C), accelerating Zn2+ transference kinetics and decreasing the amount of active water. On electrodes, Met prefers to adsorb on Zn (002) plane and further transforms into a zincophilic protective layer containing C─SOx ─C through an in situ electrochemical oxidization, suppressing H2 evolution/corrosion reactions and guiding dendrite-free Zn deposition. By using Met-containing ZnSO4 electrolytes, the Zn//Zn cells show superior cycling performance under 30 mA cm-2 /30 mA h cm-2 . Moreover, the full cells Zn//NH4 V4 O10 full cells using the modified electrolytes exhibit good performance at temperatures from -8 to 60 °C. Notably, a high energy density of 105.30 W h kg-1 can be delivered using a low N/P ratio of 1.2, showing a promising prospect of Met electrolytes additives for practical use.
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