材料科学
纳米线
阳极
电解质
催化作用
锂(药物)
阴极
电池(电)
过电位
离子电导率
电极
纳米技术
无机化学
化学工程
电化学
物理化学
有机化学
工程类
内分泌学
物理
功率(物理)
化学
医学
量子力学
作者
Yi Xing,Nan Chen,Mingchuan Luo,Yingjun Sun,Yong Yang,Jiasheng Qian,Li Li,Shaojun Guo,Renjie Chen,Feng Wu
标识
DOI:10.1016/j.ensm.2019.06.008
摘要
To achieve a long-cycle-life lithium-air battery, the catalyst, electrolyte and lithium anode should be optimized synergistically. Herein, we achieve a super-long cycle-life lithium-O2 battery by integrating the synergistic effect of highly active Pt3Co nanowires (PtCo NWs) cathode catalyst and stable quasi-solid SiO2-ionic liquid (IL) electrolyte. The PtCo NWs can effectively reduce the charge voltage below 3.2 V, but have to induce the decomposition of the conventional liquid electrolyte. The SiO2-IL electrolyte has a high ionic conductivity, but it still cannot match with carbonaceous oxygen electrode, due to its large charge overpotential. By combining the PtCo NWs cathode catalyst with quasi-solid electrolyte, the lithium-O2 battery can reversibly discharge and charge above 300 cycles (>3000 h). When the battery is disassembled, the lithium metal anode is preserved well, which is closely covered by a layer of SiO2 nanoparticles containing IL. By contrast, the lithium anode completely changes to the white powders for the one with ether-based electrolyte stored under the same condition, demonstrating the lithium anode is perfectly protected by the SiO2-IL electrolyte, which is a critical factor for achieving the long-life performance of lithium-O2 battery. Even under the air atmosphere, the battery can still cycle very well.
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