Rapid Self-Healing Gel Electrolyte Based on Deep Eutectic Solvents for Solid-State Lithium Batteries.
Rapid Self-Healing Gel Electrolyte Based on Deep Eutectic Solvents for Solid-State Lithium Batteries.
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DOI：
10.1021/acsami.2c12445
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发表时间：
2022-10
影响因子：
9.5
通讯作者：
Qiqi Li;Zhijie Zhang;Yang Li;Huan Li;Ziyang Liu;Xingjiang Liu;Qiang Xu
中科院分区：
文献类型：
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作者：
Qiqi Li;Zhijie Zhang;Yang Li;Huan Li;Ziyang Liu;Xingjiang Liu;Qiang Xu
深共晶溶剂（DES）是一种很有前途的锂金属电池电解液。然而，DES液体电解质会引起安全问题，并与锂阳极发生副反应。因此，有必要对des基电解质进行固化，提高其电化学稳定性。在此，我们提出了一种新型的基于des的快速自愈凝胶电解质，它能够在30分钟内自光滑其表面裂缝。该电解质具有不可燃性（SET = 4 s g-1）、高离子电导率（25℃时为1.1 × 10-3 s cm-1）和宽电化学电压窗（4.5 V vs Li/Li+）等特点。因此，将凝胶电解质与锂阳极和LiFePO4阴极耦合的固态锂电池提供了135.4 mA h g-1的高比容量，并具有持久的循环稳定性（>1200 h）。这项工作为耐火高能固态锂电池的设计提供了有价值的见解。
A deep eutectic solvent (DES) is a promising electrolyte choice for lithium metal batteries. However, the DES liquid electrolyte causes safety concerns and side reactions with the lithium anode. Therefore, it is necessary to solidify the DES-based electrolyte and enhance its electrochemical stability. Herein, we present a novel DES-based rapid self-healing gel electrolyte, which is able to self-smooth its surface cracks in only 30 min. The electrolyte exhibits noncombustibility (SET = 4 s g-1), high ionic conductivity (1.1 × 10-3 S cm-1 at 25 °C), and a wide electrochemical voltage window (4.5 V vs Li/Li+). As a result, the solid-state lithium batteries coupling the gel electrolyte with the Li anode and LiFePO4 cathode deliver a high specific capacity of 135.4 mA h g-1 with durable cyclic stability (>1200 h). This work provides valuable insights for design of fire-resistant and high-energy solid-state lithium batteries.