Reducing Water Activity by Zeolite Molecular Sieve Membrane for Long-Life Rechargeable Zinc Battery,Advanced Materials

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Reducing Water Activity by Zeolite Molecular Sieve Membrane for Long-Life Rechargeable Zinc Battery
Advanced Materials ( IF 27.4 ) Pub Date : 2021-08-02 , DOI: 10.1002/adma.202102415
Huijun Yang _{1,

2} , Yu Qiao ₁ , Zhi Chang ₁ , Han Deng ₁ , Xingyu Zhu _{1,

2} , Ruijie Zhu ₃ , Zetao Xiong ₃ , Ping He ₄ , Haoshen Zhou _{1,

2,

4}

Affiliation

Aqueous electrolytes offer major advantages in safe battery operation, green economy, and low production cost for advanced battery technology. However, strong water activity in aqueous electrolytes provokes a hydrogen evolution reaction and parasitic passivation on electrodes, leaving poor ion-transport in the electrolyte/electrode interface. Herein, a zeolite molecular sieve-modified (zeolite-modified) aqueous electrolyte is proposed to reduce water activity and its side-reaction. First, Raman spectroscopy reveals a highly aggressive solvation configuration and significantly suppressed water activity toward single water molecule. Then less hydrogen evolution and anti-corrosion ability of zeolite-modified electrolyte by simulation and electrochemical characterizations are identified. Consequently, a zinc (Zn) anode involves less side-reaction, and develops into a compact deposition morphology, as proved by space-resolution characterizations. Moreover, zeolite-modified electrolyte favors cyclic life of symmetric Zn||Zn cells to 4765 h at 0.8 mA cm⁻², zinc-VO₂ coin cell to 3000 cycles, and pouch cell to 100 cycles. Finally, the mature production technique and low-cost of zeolite molecular sieve would tremendously favor the future scale-up application in engineering aspect.

中文翻译：

长寿命可充电锌电池用沸石分子筛膜降低水分活度

水性电解质在电池安全运行、绿色经济和先进电池技术的低生产成本方面具有主要优势。然而，水性电解质中的强水活度会引发析氢反应和电极上的寄生钝化，从而导致电解质/电极界面中的离子传输不良。在此，提出了沸石分子筛改性（沸石改性）水性电解质以降低水活度及其副反应。首先，拉曼光谱揭示了一种高度侵蚀性的溶剂化构型，并显着抑制了对单个水分子的水活度。然后通过模拟和电化学表征确定沸石改性电解质的析氢和抗腐蚀性能较差。因此，锌 (Zn) 阳极涉及较少的副反应，并发展成紧凑的沉积形态，如空间分辨率特征所证明的那样。此外，沸石改性电解质有利于对称 Zn||Zn 电池在 0.8 mA cm 下的循环寿命达到 4765 小时^-2，锌-VO ₂纽扣电池达到 3000 次循环，软包电池达到 100 次循环。最后，沸石分子筛成熟的生产工艺和低成本将极大地有利于未来在工程方面的放大应用。

更新日期：2021-09-21

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