The deployment of high-energy-density lithium-metal batteries has been greatly impeded by Li dendrite growth and safety concerns originating from flammable liquid electrolytes. Herein, we report a stable quasi-solid-state Li metal battery with a deep eutectic solvent (DES)-based self-healing polymer (DSP) electrolyte. This electrolyte was fabricated in a facile manner by in situ copolymerization of 2-(3-(6-methyl-4-oxo-1,4-dihydropyrimidin-2-yl)ureido)ethyl methacrylate (UPyMA) and pentaerythritol tetraacrylate (PETEA) monomers in a DES-based electrolyte containing fluoroethylene carbonate (FEC) as an additive. The well-designed DSP electrolyte simultaneously possesses non-flammability, high ionic conductivity and electrochemical stability, and dendrite-free Li plating. When applied in Li metal batteries with a LiMn2 O4 cathode, the DSP electrolyte effectively suppressed manganese dissolution from the cathode and enabled high-capacity and a long lifespan at room and elevated temperatures.

中文翻译：

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基于深共溶溶剂的自修复聚合物电解质，可用于安全长寿命的锂金属电池。

Li树枝状晶体的生长和源自易燃液体电解质的安全隐患极大地阻碍了高能量密度锂金属电池的部署。在此，我们报道了一种稳定的准固态锂金属电池，该电池具有深共晶溶剂（DES）基自修复聚合物（DSP）电解质。该电解质通过甲基丙烯酸2-（3-（6-甲基-4-氧代-1,4-二氢嘧啶-2-基）脲基）甲基丙烯酸乙酯（UPyMA）和季戊四醇四丙烯酸酯（PETEA）的原位共聚而容易地制备。含有氟代碳酸亚乙酯（FEC）作为添加剂的DES基电解质中的单体。精心设计的DSP电解液同时具有不燃性，高离子电导率和电化学稳定性以及无枝晶状的Li镀层。当用于带有LiMn2 O4阴极的锂金属电池中时，