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    佘宇坤, 项程程, 王小玉, 李 磊. 含溴化铈的聚合物电解质在锂氧电池中的应用[J]. 功能高分子学报,2022,35(5):484-492. doi: 10.14133/j.cnki.1008-9357.20211104001
    引用本文: 佘宇坤, 项程程, 王小玉, 李 磊. 含溴化铈的聚合物电解质在锂氧电池中的应用[J]. 功能高分子学报,2022,35(5):484-492. doi: 10.14133/j.cnki.1008-9357.20211104001
    SHE Yukun, XIANG Chengcheng, WANG Xiaoyu, LI Lei. Application of Polymer Electrolytes Incorporating Cerium Bromide in Lithium-Oxygen Batteries[J]. Journal of Functional Polymers, 2022, 35(5): 484-492. doi: 10.14133/j.cnki.1008-9357.20211104001
    Citation: SHE Yukun, XIANG Chengcheng, WANG Xiaoyu, LI Lei. Application of Polymer Electrolytes Incorporating Cerium Bromide in Lithium-Oxygen Batteries[J]. Journal of Functional Polymers, 2022, 35(5): 484-492. doi: 10.14133/j.cnki.1008-9357.20211104001

    含溴化铈的聚合物电解质在锂氧电池中的应用

    Application of Polymer Electrolytes Incorporating Cerium Bromide in Lithium-Oxygen Batteries

    • 摘要: 采用溶液浇注法制备了含有溴化铈(CeBr3)的聚偏二氟乙烯-六氟丙烯(PVDF-HFP)基聚合物电解质,使其在锂氧(Li-O2)电池中的稳定性得到提升。用扫描电子显微镜(SEM)、X射线光电子能谱(XPS)、傅里叶红外光谱(FT-IR)对Li-O2电池循环后的极片和电解质进行形貌和成分分析;用电化学工作站和电池测试系统对Li-O2电池进行电化学性能测试;研究了CeBr3对聚合物电解质稳定性的增强作用。以放电终压下降至2 V为标准,当电流密度为500 mA/g、比容量为1000 mA·h/g时,传统PVDF-HFP基聚合物电解质的Li-O2电池可循环47圈,而PVDF-HFP-CeBr3基聚合物电解质的Li-O2电池可循环长达112圈。

       

      Abstract: Li-O2 batteries have ultra-high theoretical energy density and they are promising to replace commercial Li-ion batteries in the future. Compared with liquid electrolytes, polymer electrolytes have the advantages of non-flammability and higher electrochemical and thermal stability. Polymer electrolytes containing cerium bromide (CeBr3) additives were prepared, which greatly improved the reliability and stability of Li-O2 batteries. Poly(vinylidene fluoride-co-hexafluopropylene) (PVDF-HFP) based polymer electrolyte containing CeBr3 was prepared by solution casting method to improve its stability in Li-O2 battery. The morphology and composition of the electrode and electrolyte after cycling of Li-O2 battery were characterized by Scanning Electron Microscopy (SEM), X-ray Photoelectron Spectroscopy (XPS) and Fourier Transform Infrared Spectroscopy (FT-IR). The electrochemical performance of lithium-oxygen battery was tested by electrochemical workstation and battery test system to study the enhancement effect of CeBr3 on the stability of polymer electrolyte. The experimental results demonstrate the bifunctional effect of CeBr3 in PVDF-HFP electrolyte by trapping superoxide radicals and reducing the charging overpotential. The ionic conductivity of the electrolyte at 25 ℃ is 5.87×10−4 S/cm. At a current density of 500 mA/g and specific capacity of 1000 mA·h/g, the Li-O2 battery with traditional PVDF-HFP polymer electrolyte drops the voltage below 2 V after 47 cycles, while the Li-O2 battery with PVDF-HFP-CeBr3 polymer electrolyte can reach up to 112 cycles.

       

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