分层多孔CuCo_2O_4微米花:高效锂离子电池负极材料及锂-氧电池正极催化剂材料
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- 英文论文题名：Hierarchically Porous CuCo_2O_4 Microflowers:a Superior Anode Material for Li-ion Batteries and a Stable Cathode Electrocatalyst for Li-O_2 Batteries
- 论文作者：牛斐洱 ; 王娜娜 ; 岳杰 ; 陈良 ; 杨剑 ; 钱逸泰
- 英文论文作者：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
- 年：2016
- 作者机构：山东大学化学与化工学院;中国科技大学;
- 论文关键词：多孔纳米片 ; 花状结构 ; 电化学性能 ; 锂离子电池 ; 锂-氧电池
- 会议召开时间：2016-07-01
- 会议录名称：中国化学会第30届学术年会摘要集-第三十分会：化学电源
- 语种：中文
- 分类号：TQ131.21;TM912
- 学会代码：ZGHY
- 会议名称：中国化学会第30届学术年会-第三十分会 ; 化学电源
- 会议地点：中国辽宁大连
- 主办单位：中国化学会
- 学会名称：中国化学会
- 页数：1
- 文件大小：157k
- 原文格式：D
- 会议级别：全国
摘要
由多孔超薄纳米片自组装合成的分层多孔CuCo_2O_4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,CuCo_2O_4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,CuCo_2O_4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CuCo_2O_4及碳材料。
Hierarchical CuCo_2O_4 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,CuCo_2O_4 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 CuCo_2O_4 microflowers still remains at 612 mAh g~(-1) after 500 cycles.In Li-O_2 batteries,CuCo_2O_4 microflowers as the cathode catalyst last 120 cycles,much longer than highly aggregated CuCo_2O_4 and pure carbon.
Hierarchical CuCo_2O_4 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,CuCo_2O_4 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 CuCo_2O_4 microflowers still remains at 612 mAh g~(-1) after 500 cycles.In Li-O_2 batteries,CuCo_2O_4 microflowers as the cathode catalyst last 120 cycles,much longer than highly aggregated CuCo_2O_4 and pure carbon.
引文
[1]Chen,M.;Yu,C.;Liu,S.H.;Fan,X.M.;Zhao,C.T.;Zhang,X.;Qiu,J.S.Nanoscale 2015,7:1791-1795.
[2]Vu,A.;Qian,Y.Q.;Stein,A.Adv.Energy Mater.2012,2:1056-1085.
[2]Vu,A.;Qian,Y.Q.;Stein,A.Adv.Energy Mater.2012,2:1056-1085.