Enhancement of stability for lithium oxygen batteries by employing electrolytes gelled by poly(vinylidene fluoride-co-hexafluoropropylene) and tetraethylene glycol dimethyl ether
Enhancement of stability for lithium oxygen batteries by employing electrolytes gelled by poly(vinylidene fluoride-co-hexafluoropropylene) and tetraethylene glycol dimethyl ether
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DOI：
10.1016/j.electacta.2015.03.103
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发表时间：
2015-11
影响因子：
6.6
通讯作者：
Jinqiang Zhang;Bing Sun;Xiuqiang Xie;Katja Kretschmer;Guoxiu Wang
中科院分区：
文献类型：
--
作者：
Jinqiang Zhang;Bing Sun;Xiuqiang Xie;Katja Kretschmer;Guoxiu Wang
以聚偏氟乙烯-六氟丙烯共聚物（PVDF-HFP）为基体，四乙二醇二甲醚（TEGDME）为增塑剂，制备了自支撑凝胶聚合物电解质。所制备的凝胶聚合物电解质具有较大的操作窗口和可接受的离子电导率。当应用于锂氧电池时，当使用不含催化剂的炭黑电极作为阴极时，凝胶聚合物电解质可以支持2988 mAh g− 1的高初始放电容量。此外，具有凝胶聚合物电解质的电池在固定容量循环中可以持续至少50次循环，显示出优异的稳定性。详细的研究表明，凝胶化过程是必不可少的循环稳定性的提高。自支撑凝胶聚合物电解质具有优异的电化学性能，在长寿命锂氧电池中具有很大的应用潜力。
Free-standing gel polymer electrolytes with poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) matrix plasticized with tetraethylene glycol dimethyl ether (TEGDME) were prepared and investigated. The as-prepared gel polymer electrolytes exhibited large operating window and acceptable ionic conductivity. When applied in lithium oxygen batteries, the gel polymer electrolyte could support a high initial discharge capacity of 2988 mAh g−1when a carbon black electrode without catalyst was used as cathode. Furthermore, the battery with gel polymer electrolyte can last at least 50 cycles in the fixed capacity cycling, displaying an excellent stability. Detailed study reveals that the gelling process is essential for the cycling stability enhancement. With excellent electrochemical properties, the free-standing gel polymer electrolyte presented in this investigation has great application potentials in long-life lithium oxygen batteries.