Enhanced Electrochemical Performance of Non-Aqueous Li-O-2 Batteries with Triethylene Glycol Dimethyl Ether-Based Electrolyte
Enhanced Electrochemical Performance of Non-Aqueous Li-O-2 Batteries with Triethylene Glycol Dimethyl Ether-Based Electrolyte
复制标题
三甘醇二甲醚基电解质增强非水 Li-O-2 电池的电化学性能
DOI：
10.1149/2.0251707jes
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发表时间：
2017
影响因子：
3.9
通讯作者：
Yang Jun
中科院分区：
文献类型：
--
作者：
Wu Chaolumen;Li Taoran;Liao Chenbo;Xu Qingkai;Cao Yuancheng;Li Lei;Yang Jun
评价了三甘醇二甲醚(G3)作为非水锂氧(Li-O2)电池电解液溶剂的性能。与传统的1M LiTFSI液体电解液相比，1M LiTFSI液体电解液在G3中具有更低的粘度、更高的氧溶解度和扩散、更高的离子电导率和锂离子迁移数。与使用G4基电解液的电池相比，使用G3基电解液的Li-O2电池表现出更好的循环稳定性和更高的倍率性能。在2.5A g Carbon−1的较高电流密度下，使用G3基电解液的电池的放电容量约为1472mAg Carbon−1，约为使用G4基电解液的电池的4倍。当电流密度为1A g Carbon−1，固定容量为1000mAhg Carbon−1时，采用G3基电解液的电池可以稳定工作80次，而使用G4基电解液的电池只能稳定工作20次。因此，我们认为G3基电解液可能是发展锂氧电池的一种合适的替代G4基电解液。
Triethylene glycol dimethyl ether (G3) is evaluated as an electrolyte solvent for non-aqueous lithium-oxygen (Li-O 2) batteries. A liquid electrolyte of 1 M LiTFSI in G3 shows lower viscosity, higher oxygen solubility and diffusion, higher ionic conductivity and lithium ionic transference number compared to the conventional liquid electrolyte of 1 M LiTFSI in tetraethylene glycol dimethyl ether (G4). Then the Li-O 2 battery using the G3-based electrolyte shows better cycling stability and higher rate capability compared to the battery using the G4-based electrolyte. At a higher current density of 2.5 A g carbon− 1, the discharge capacity of the battery using the G3-based electrolyte is about 1472 mAh g carbon− 1, which is about four times higher than that of the battery using the G4-based electrolyte. At current density of 1 A g carbon− 1 with a fixed capacity of 1000 mAh g carbon− 1, the battery using the G3-based electrolyte can be operated stably for 80 cycles, while only 20 cycles are achieved by using the G4-based electrolyte. Therefore, we think the G3-based electrolyte could be a proper alternative electrolyte to the conventional G4-based electrolyte for the development of Li-O 2 batteries.