Li-O_(2) batteries(LOBs) have been perceived as the most potential clean energy system for fast-growing electric vehicles by reason of their environmentally friendlier,high energy density and high reversibility.Howeve...Li-O_(2) batteries(LOBs) have been perceived as the most potential clean energy system for fast-growing electric vehicles by reason of their environmentally friendlier,high energy density and high reversibility.However,there are still some issues limiting the practical application of LOBs,such as the large gap between the actual capacity level and the theoretical capacity,low rate performance as well as short cycle life.Herein,hollow CeO_(2)/Co_(3)O_(4) polyhedrons have been synthesized by MOF template with a simple method.And it is was further served as a cathode catalyst in Li-O_(2) batteries.By means of the synergistic effect of two different transition metal oxides,nano-sized hollow porous CeO_(2)/Co_(3)O_(4) cathode obtained better capacity and cycle performance.As a result,excellent cyclability of exceeding 140 and 90 cycles are achieved at a fixed capacity of 600 and 1000 mAh/g,respectively.The successful application of this catalyst in LOBs offers a novel route in the aspect of the synthesis of other hollow porous composite oxides as catalysts for cathodes in LOBs systems by the MOF template method.展开更多
基金financially supported by National Key R&D Program of China (No.2017YFE0195200)the Natural Science Fund of China (Nos.51871134,51672159)the Science Fund of Shandong Province (No.ZR2019MEM007)。
文摘Li-O_(2) batteries(LOBs) have been perceived as the most potential clean energy system for fast-growing electric vehicles by reason of their environmentally friendlier,high energy density and high reversibility.However,there are still some issues limiting the practical application of LOBs,such as the large gap between the actual capacity level and the theoretical capacity,low rate performance as well as short cycle life.Herein,hollow CeO_(2)/Co_(3)O_(4) polyhedrons have been synthesized by MOF template with a simple method.And it is was further served as a cathode catalyst in Li-O_(2) batteries.By means of the synergistic effect of two different transition metal oxides,nano-sized hollow porous CeO_(2)/Co_(3)O_(4) cathode obtained better capacity and cycle performance.As a result,excellent cyclability of exceeding 140 and 90 cycles are achieved at a fixed capacity of 600 and 1000 mAh/g,respectively.The successful application of this catalyst in LOBs offers a novel route in the aspect of the synthesis of other hollow porous composite oxides as catalysts for cathodes in LOBs systems by the MOF template method.
