A flexible and highly ion conductive polyzwitterionic eutectogel for quasi-solid state zinc ion batteries with efficient suppression of dendrite growth,Journal of Materials Chemistry A

当前位置： X-MOL 学术 › J. Mater. Chem. A › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

A flexible and highly ion conductive polyzwitterionic eutectogel for quasi-solid state zinc ion batteries with efficient suppression of dendrite growth
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2022-08-08 , DOI: 10.1039/d2ta05009a
Yihan Wu ₁ , Yongqi Deng ₁ , Kefu Zhang ₁ , Yu Wang ₁ , Lele Wang ₁ , Lifeng Yan ₁

Affiliation

Gels have gained much attention in flexible batteries. However, traditional hydrogel electrolytes are insufficient to solve the fundamental problems of zinc anodes, such as dendrite issues and parasitic side reactions, which severely restrict the development of zinc ion batteries. Here, a novel polyzwitterionic eutectogel (PSPE) is constructed with a DES (ChCl–EG–urea), zwitterionic sulfobetaine, and Zn(ClO₄)₂. Compared to common hydrogels, the PSPE eutectogel contains no free water, thus widening the electrochemical window and suppressing side reactions. The charged groups of the polyzwitterion can also guide the distribution of ions and promote smooth zinc deposition. Consequently, Zn//Zn cells with the PSPE eutectogel achieve a long cycle life of over 2200 h at 1 mA cm⁻². At 0.2 A g⁻¹, a full battery assembled with a V₂O₅ cathode and the PSPE eutectogel electrolyte can provide a high capacity of 201.8 mA h g⁻¹. Furthermore, the flexible battery can light up LEDs under different bending angles. Besides, the low volatility of the DES and strong electrostatic interactions of zwitterionic groups allow the eutectogel to have excellent water retention. Under 60 °C unsealed conditions, the PSPE eutectogel retained 87.9% of its initial weight after 55 h. Such a highly conductive and anti-dehydration polyzwitterionic eutectogel shows promising applications in wearable energy storage devices.

中文翻译：

一种用于准固态锌离子电池的灵活且高离子导电的多两性离子共晶凝胶，可有效抑制枝晶生长

凝胶在柔性电池中引起了广泛关注。然而，传统的水凝胶电解质不足以解决锌负极的根本问题，如枝晶问题和寄生副反应，严重制约了锌离子电池的发展。在这里，用DES（ChCl-EG-脲）、两性离子磺基甜菜碱和Zn(ClO ₄ ) ₂构建了一种新型的多两性离子共晶凝胶（PSPE）。与普通水凝胶相比，PSPE 共晶凝胶不含游离水，从而拓宽了电化学窗口并抑制了副反应。多两性离子的带电基团还可以引导离子的分布并促进锌的顺利沉积。因此，使用 PSPE 共晶凝胶的 Zn//Zn 电池在 1 mA cm 下实现了超过 2200 小时的长循环寿命^-2。在 0.2 A g^-1下，由 V₂ O₅阴极和 PSPE 共晶凝胶电解质组装而成的完整电池可提供 201.8 mA hg^-1的高容量。此外，柔性电池可以在不同的弯曲角度下点亮 LED。此外，DES的低挥发性和两性离子基团的强静电相互作用使共晶凝胶具有出色的保水性。在 60 °C 未密封条件下，PSPE 共晶凝胶在 55 小时后保留了其初始重量的 87.9%。这种高导电和抗脱水的多两性离子共晶凝胶在可穿戴储能设备中显示出广阔的应用前景。

更新日期：2022-08-08

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11