The current high-energy lithium metal batteries are limited by their safety and lifespan owing to the lack of suitable electrolyte solutions. Here we report a synergy of fluorinated co-solvent and gelation treatment by a butenoxycyclotriphosphazene (BCPN) monomer, which facilitates the use of ether-based electrolyte solutions for high-energy lithium metal batteries. We show that the safety risks of fire and electrolyte leakage are eliminated by the fluorinated co-solvent and fireproof polymeric matrices. The compatibility with high-energy cathodes is realized by a well-tailored Li+ solvation sheath, along with BCPN-derived protective surface films developed on the cathodes. Our Li | |LiNi0.8Co0.1Mn0.1O2 cells reach high-capacity retention, superior low-temperature performance, good cyclability under high pressure and steady power supply under abusive conditions. Our electrolyte design concept provides a promising path for high energetic, durable and safe rechargeable Li batteries.
Bibliographical noteFunding Information:
B.L. acknowledges support by the National Natural Science Foundation of China (number 52072208 and number 52261160384), Shenzhen Science and Technology Program (KCXFZ20211020163810015), the Fundamental Research Project of Shenzhen (number JCYJ20220818101004009), Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program (2017BT01N111) and Shenzhen Outstanding Talents Training Fund. G.W. acknowledges the support from Australian Research Council (ARC) Discovery Projects (DP200101249 and DP210101389) and the ARC Research Hub for Integrated Energy Storage Solutions (IH180100020). B.S. acknowledges the financial support from the Australian Research Council (ARC) through the ARC Future Fellowship (FT220100561).
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