Immunizing Aqueous Zn Batteries against Dendrite Formation and Side Reactions at Various Temperatures via Electrolyte Additives,Small

当前位置： X-MOL 学术 › Small › 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.)

Immunizing Aqueous Zn Batteries against Dendrite Formation and Side Reactions at Various Temperatures via Electrolyte Additives
Small ( IF 13.0 ) Pub Date : 2021-09-15 , DOI: 10.1002/smll.202103195
Doudou Feng ₁ , Faqing Cao ₁ , Lei Hou ₁ , Tianyu Li ₂ , Yucong Jiao ₁ , Peiyi Wu ₁

Affiliation

Aqueous Zn-ion batteries own great potential on next generation wearable batteries due to the high safety and low cost. However, the uncontrollable dendrites growth and the negligible subzero temperature performance impede the batteries practical applications. Herein, it is demonstrated that dimethyl sulfoxide (DMSO) is an effective additive in ZnSO₄ electrolyte for side reactions and dendrites suppression by regulating the Zn-ion solvation structure and inducing the Zn²⁺ to form the more electrochemical stable (002) basal plane, via the higher absorption energy of DMSO with Zn²⁺ and (002) plane. Moreover, the stable reconstructed hydrogen bonds between DMSO and H₂O dramatically lower the freezing point of the electrolyte, which significantly increases the ionic conductivity and cycling performance of the aqueous batteries at subzero temperatures. As a consequence, the symmetrical Zn/Zn cell can be kept stable for more than 2100 h at 20 °C and 1200 h at −20 °C without dendrite and by-products formation. The Zn/MnO₂ batteries can perform steadily for more than 3000 cycles at 20 °C and 300 cycles at −20 °C. This work provides a facile and feasible strategy on designing high performance and dendrite free aqueous Zn-ion batteries for various temperatures.

中文翻译：

通过电解质添加剂在不同温度下使水性锌电池免受枝晶形成和副反应的影响

水系锌离子电池由于安全性高、成本低，在下一代可穿戴电池中具有巨大的潜力。然而，不可控的枝晶生长和可忽略的零下温度性能阻碍了电池的实际应用。在此，证明二甲基亚砜 (DMSO) 是 ZnSO ₄电解液中的有效添加剂，可通过调节 Zn 离子溶剂化结构和诱导 Zn ²⁺形成更电化学稳定的 (002) 基面来抑制副反应和枝晶，通过具有 Zn ²⁺和 (002) 平面的 DMSO 的更高吸收能。此外，DMSO 和 H ₂之间稳定的重构氢键O 显着降低了电解质的凝固点，从而显着提高了水系电池在零下温度下的离子电导率和循环性能。因此，对称的 Zn/Zn 电池可以在 20°C 下保持稳定超过 2100 小时，在 -20°C 下保持 1200 小时以上，而不会形成枝晶和副产物。Zn/MnO ₂电池在20°C下可稳定运行3000次以上，在-20°C下可稳定运行300次以上。这项工作为设计各种温度下的高性能和无枝晶的水性锌离子电池提供了一种简便可行的策略。

更新日期：2021-10-21

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