【作者】 牛斐洱； 王娜娜； 岳杰； 陈良； 杨剑； 钱逸泰；

【Author】 Feier Niu;Nana Wang;Jie Yue;Liang Chen;Jian Yang;Yitai Qian;Department of Chemistry and Chemical Engineering,Shandong University;Department of Chemistry,University of Science and Technology of China;

【机构】 山东大学化学与化工学院； 中国科技大学；

【摘要】 由多孔超薄纳米片自组装合成的分层多孔CuCo₂O₄微米花,应用于锂离子电池及锂氧电池,展现了其优异的电化学及电催化性能。组成该材料的多孔超薄纳米片不仅可以缩短锂离子扩散距离^[1],缓解充放电过程中的体积效应,而且由于其比表面积较大且多孔的性质,使其暴露出更多的活性位点,从而增大了活性物质与电解液及氧气的接触^[2]。作为锂离子电池负极材料,CuCo₂O₄微米花在100 mA g^-1的电流密度下,循环100圈后容量稳定保持在865 mA h g^-1。当电流密度增大为1 Ag^-1,循环500圈后其容量仍可保持在612 mA h g^-1。作为锂-氧电池正极催化剂,在限定容量为1000 mAh g^-1的条件下,CuCo₂O₄微米花可以稳定循环120圈以上,性能远远优于高度聚合的无形貌的CuCo₂O₄及碳材料。更多还原

【Abstract】 Hierarchical CuCo₂O₄ microflowers（CCFs） self-assembled by thin and porous nanosheets were synthesized by a solvothermal reaction followed by a low-temperature calcination.The porous nanosheets not only shorten the Liion diffusion distances and tolerate the volume variation upon cycling,but also enhance the transportation of oxygen and Li⁺ ions,and have abundance of active sites on the surface.Thus,both of applications exhibit the remarkable electrochemical properties.In lithium ion batteries,CuCo₂O₄ microflowers deliver a specific Li storage capacity of 865 mA h g^-1,after 100 cycles at 100 mA g^-1.Even at a high rate of 1 A g^-1,the reversible capacity of the CuCo₂O₄ microflowers still remains at 612 mAh g^-1 after 500 cycles.In Li-O₂ batteries,CuCo₂O₄ microflowers as the cathode catalyst last 120 cycles,much longer than highly aggregated CuCo₂O₄ and pure carbon.更多还原