Loosening Zinc Ions from Separator Boosts Stable Zn Plating/Striping Behavior for Aqueous Zinc Ion Batteries,Advanced Energy Materials

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Loosening Zinc Ions from Separator Boosts Stable Zn Plating/Striping Behavior for Aqueous Zinc Ion Batteries
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2023-09-25 , DOI: 10.1002/aenm.202302126
Yu Zhang _{1,

2} , Zeping Liu ₁ , Xin Li ₁ , Lishuang Fan ₁ , Yong Shuai ₂ , Naiqing Zhang ₁

Affiliation

Aqueous zinc ion batteries are attracting broad interest in stationary energy storage where low cost, robust security, and satisfactory capacity matter most. However, metal zinc anodes suffer from destructive dendrite issues during repeated charging/discharging process, decreasing the cycle life of batteries. Herein, smoother zinc plating/striping behaviors are achieved by group modification in the structural unit of the polymer separator. Experimental results and theoretical simulations reveal that the polymer skeleton can release zinc ion more easily when modified with carbonylation side groups and contribute to much faster zinc ion transfer capability. Typically, symmetric Zn cells with a thin thickness separator of 21 µm exhibit ultralong cycle life over 2800 h at 1 mA cm⁻² within 1 mAh cm⁻² and 300 h under a high current density of 5 mA cm⁻² within high areal capacity of 3 mAh cm⁻². Full cells using a sodium vanadium oxide cathode also show stable reversible charging/discharging performance after 2000 cycles at 3 A g⁻¹. This work is expected to inspire promising strategies in molecular design in polymeric separator toward stabilizing metal anodes beyond this anode itself.

中文翻译：

从隔膜中松开锌离子可提高水性锌离子电池稳定的镀锌/剥离行为

水性锌离子电池在固定式储能领域引起了广泛的兴趣，其中低成本、强大的安全性和令人满意的容量最为重要。然而，金属锌负极在重复充电/放电过程中会出现破坏性枝晶问题，从而降低电池的循环寿命。在此，通过聚合物隔膜的结构单元中的基团改性实现更平滑的镀锌/剥离行为。实验结果和理论模拟表明，当用羰基化侧基修饰时，聚合物骨架可以更容易地释放锌离子，并有助于更快的锌离子转移能力。通常，具有厚度为21μm的薄隔膜的对称锌电池在1mAh cm -2 内的1 mA cm -2 下表现出超过2800小时的超长循环寿命，在高面积容量的⁵ mA ^cm -2高电流密度下表现出300小时的^超长循环寿命3mAh cm ^-2。使用钠钒氧化物阴极的全电池在3 A g ^-1下循环2000次后也表现出稳定的可逆充电/放电性能。这项工作有望激发聚合物隔膜分子设计的有前景的策略，以稳定阳极本身之外的金属阳极。

更新日期：2023-09-25

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