材料科学
成核
离子
纳米尺度
锌
水溶液
沉积(地质)
图层(电子)
原子层沉积
纳米技术
化学工程
无机化学
冶金
物理化学
有机化学
化学
古生物学
沉积物
工程类
生物
作者
Ziqing Wang,Jiefeng Diao,Graeme Henkelman,C. Buddie Mullins
标识
DOI:10.1002/adfm.202314002
摘要
Abstract Aqueous zinc‐ion batteries have been regarded as safe and cheap energy storage devices. However, severe zinc dendrite growth and water decomposition limit the sustainability of aqueous zinc‐ion batteries. Herein, sodium‐difluoro(oxalato)borate (NaDFOB) is introduced into ZnSO 4 electrolyte to modify the electric double layer (EDL) and the nucleation mechanism. Electrochemical tests and density functional theory calculations reveal that DFOB − adsorbs on the zinc electrode to form a water‐poor EDL, effectively suppressing side reactions. Notably, a detailed investigation of zinc deposition demonstrates that the adsorbed DFOB − ions induce progressive nucleation, resulting in nanoscale zinc nuclei and uniform zinc growth. Additionally, the adsorbed DFOB − ions decompose into a solid electrolyte interphase, further protecting the zinc electrode. Consequently, the Zn/Zn symmetric cell using ZnSO 4 /NaDFOB electrolyte can cycle for over 500 h at 5 mA cm −2 to reach a capacity of 10 mAh cm −2 , while a Zn/Cu half cell maintains an average Coulombic efficiency of 99.3% over 400 cycles. A high capacity retention of 93.0% with a capacity of 250 mAh g −1 at 0.2 A g −1 is achieved in the ZnSO 4 /NaDFOB electrolyte in full cell cycling. These findings highlight the impact of anion‐modified EDL and progressive nucleation on achieving highly uniform zinc deposition.
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