Boosting Dendrite-Free Zinc Anode with Strongly Polar Functional Group Terminated Hydrogel Electrolyte for High-Safe Aqueous Zinc-Ion Batteries,Advanced Functional Materials

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Boosting Dendrite-Free Zinc Anode with Strongly Polar Functional Group Terminated Hydrogel Electrolyte for High-Safe Aqueous Zinc-Ion Batteries
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2024-11-12 , DOI: 10.1002/adfm.202412865
Junyuan Li ₁ , Heng Zhang _{1,

2} , Ziming Liu ₁ , Hao Du ₁ , Hongxin Wan ₁ , Xiangcai Li ₁ , Jun Yang ₁ , Chao Yan ₁

Affiliation

Aqueous zinc-ion batteries (AZIBs) have become a promising energy storage device due to their low cost and high security. However, the severe dendrite growth and side reactions on metallic zinc (Zn) anode hamper their commercial implementation. Herein, a strongly electronegative trifluoroborate anion (─BF₃⁻) functionalized polyacrylamide hydrogel (PAME) is well-designed and constructed as the quasi-solid-state electrolyte to overcome these obstacles. The PAME chain segments terminated with strongly polar functional groups promote the conversion of water molecules from free water to bound water through the enhanced hydrogen bonding interaction to alleviate the side reactions. Furthermore, the PAME electrolyte featured with hierarchically porous structure and enhanced electrostatic interaction among the ─BF³⁻ groups, and Zn²⁺ ions homogenizes the high-flux Zn ion transport and induce the uniform deposition to restrain dendrite growth. Consequently, the assembled Zn‖PAME‖Zn batteries deliver remarkable cycling stability over 1800 h at 1 mA cm⁻² and 900 h at 15 mA cm⁻². Additionally, the constructed Zn‖PAME‖MnO₂ full cells achieve a reversible capacity of 202 mAh g⁻¹ at 2.0 A g⁻¹ with a capacity retention rate of 91.4% over 500 cycles. This work sheds light on constructing the strongly polar hydrogel electrolyte to boost free-dendrite Zn anodes for long-lifespan AZIBs.

中文翻译：

用于高安全性水性锌离子电池的具有强极性官能团封端水凝胶电解质的助压无枝晶锌负极

水系锌离子电池（AZIB）因其低成本和高安全性而成为一种很有前途的储能装置。然而，严重的枝晶生长和对金属锌（Zn）阳极的副反应阻碍了其商业应用。在此，强电负性三氟硼酸盐阴离子（─BF₃⁻）功能化聚丙烯酰胺水凝胶（PAME）被精心设计和构建为准固态电解质以克服这些障碍。以强极性官能团结尾的 PAME 链段通过增强的氢键相互作用促进水分子从游离水转化为结合水，从而减轻副反应。此外，PAME 电解质具有分层多孔结构，增强了 ─BF³⁻ 基团之间的静电相互作用，Zn²⁺ 离子均质了高通量 Zn 离子传输并诱导均匀沉积以抑制枝晶生长。因此，组装好的 Zn‖PAME‖Zn 电池在 1 mA ^cm-2 下在 1800 小时内和 15 mA ^cm-2 下分别在 900 小时内具有卓越的循环稳定性。此外，构建的 Zn‖PAME‖MnO₂ 全电池在 2.0 A ^g-1 下实现了 202 mAh ^g-1 的可逆容量，在 500 次循环中容量保持率为 91.4%。这项工作阐明了构建强极性水凝胶电解质以增强自由枝晶 Zn 阳极以实现长寿命 AZIB。

更新日期：2024-11-12

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