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Deep-Eutectic-Solvent-Based Self-Healing Polymer Electrolyte for Safe and Long-Life Lithium-Metal Batteries |
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| Authors: | Pauline Jaumaux Qi Liu Dr. Dong Zhou Xiaofu Xu Tianyi Wang Yizhou Wang Feiyu Kang Prof. Baohua Li Prof. Guoxiu Wang |
| Affiliation: | 1. Centre for Clean Energy Technology, School of Mathematical and Physical Sciences, University of Technology Sydney, Sydney, NSW, 2007 Australia These authors contributed equally to this work.;2. School of Shenzhen International Graduate, Tsinghua University, Shenzhen, Guangdong, 518055 China These authors contributed equally to this work.;3. Centre for Clean Energy Technology, School of Mathematical and Physical Sciences, University of Technology Sydney, Sydney, NSW, 2007 Australia;4. School of Shenzhen International Graduate, Tsinghua University, Shenzhen, Guangdong, 518055 China |
| Abstract: | 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 LiMn2O4 cathode, the DSP electrolyte effectively suppressed manganese dissolution from the cathode and enabled high-capacity and a long lifespan at room and elevated temperatures. |
| Keywords: | deep eutectic solvents dendrite growth lithium-metal batteries polymer electrolytes self-healing |