Abstract
Organic-inorganic composite electrolytes (PL-SCEs) based on polyethylene oxide (PEO) and Li6·75La3Zr1·75Ta0·25O12 (LLZTO) are considered to be one of the most promising solid electrolytes. However, the low room-temperature ionic conductivity caused by the inherent high crystallinity of PEO severely hinders its practical application. Herein, a novel PL-SCE is synthesized through a facile thermal induction and ultraviolet crosslinking process, using fluoroethylene carbonate (FEC) and 4-methylbenzophenone as thermal/ultraviolet triggers, and tetraethylene glycol dimethyl ether (TEGDME) as an ion conductive plasticizer. The F atom in the FEC can attack the C–O bond in the PEO chain and abstract the hydrogen attached to the C atom to form an active site, prompt TEGDME and PEO to achieve a higher degree of cross-linking, thus endowing PL-SCE with high Li-ion conductivity of 5.35 × 10−4 S cm−1 at 25 °C. Besides, the obtained PL-SCE exhibits excellent wettability and compatibility with Li metal anodes, the interfacial impedance is only 44 Ω cm2. The LiFePO4||Li full cell based on the proposed PL-SCE exhibits an excellent room-temperature cycling performance with a capacity retention rate up to 88% and the average Coulombic efficiency above 98% upon 450 cycles at 1 C. Prospectively, this work provides a promising alternative method for the practical application of PL-SCEs.
Published Version
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