C/Cu多孔微球固载Co3O4纳米片作为锂离子电池的高性能负极材料  

Co_(3)O_(4)nanosheets anchored on C/Cu porous microspheres as high-performance anode materials for lithium-ion battery

作　　者：孙逊 张珺 张华然 曹余良 周金平 Xun Sun;Jun Zhang;Huaran Zhang;Yuliang Cao;Jinping Zhou(Hubei Engineering Center of Natural Polymer-based Medical Materials,Engineering Research Center of Organosilicon Compounds&Materials of Ministry of Education,Department of Chemistry,Wuhan University,Wuhan 430072,China;College of Material Engineering,Xuzhou Vocational College of Industrial Technology,Xuzhou 221000,China)

机构地区：[1]Hubei Engineering Center of Natural Polymer-based Medical Materials,Engineering Research Center of Organosilicon Compounds&Materials of Ministry of Education,Department of Chemistry,Wuhan University,Wuhan 430072,China [2]College of Material Engineering,Xuzhou Vocational College of Industrial Technology,Xuzhou 221000,China

出　　处：《Science China Materials》2023年第12期4575-4586,共12页中国科学（材料科学）（英文版）

基　　金：financially supported by the Key Research and Development Program of Hubei Province(2020BCA079);the National Natural Science Foundation of China(52173106)。

摘　　要：过渡金属氧化物(TMOs)用作电极材料时,会在循环过程中产生严重的体积变化,并且其自身的导电率也较低,因此它的电化学性能较差.设计和开发独特的TMOs纳米结构并将其与导电碳基底相结合是改善其电化学性能的有效策略.本工作中,我们设计了一种C/Cu多孔微球,并通过原位合成在碳壁上垂直生长Co_(3)O_(4)纳米片.作为导电基底,C/Cu多孔微球提供了多尺度孔隙网络和大的电极/电解质接触界面,显著改善了电子和离子扩散动力学.原位合成的Co_(3)O_(4)纳米片牢牢地固定在碳壁上,从而提高了复合微球在长期循环中的结构稳定性.得益于独特的结构特征,用作锂离子电池负极材料的C/Cu@Co_(3)O_(4)复合多孔微球表现出优异的倍率性能、高充电比容量和出色的循环稳定性.As electrode materials,transition metal oxides(TMOs)exhibit poor electrochemical performances owing to their inherent low electronic conductivity and considerable volume expansion and contraction during charge/discharge cycles.Designing TMOs with unique nanostructure and combining them with conductive carbon substrates are effective strategies to address the inherent issues.In this work,we designed C/Cu porous microspheres and grew Co_(3)O_(4)nanosheets(NS)vertically on the carbon walls using an in situ synthesis route.As a conductive substrate,the C/Cu microspheres provide a hierarchical pore network and an electrode/electrolyte contact interface with large area,which can substantially enhance electron and ion diffusion kinetics.The in situ synthesized Co_(3)O_(4)NSs are firmly anchored on the carbon walls,thereby increasing the structural durability of the composites in long-term cycling.Due to their unique structural characteristics,when using the C/Cu@Co_(3)O_(4)composite microspheres as the anode materials for lithium-ion batteries,the batteries exhibit an enhanced rate performance(a high reversible specific capacity of 622 mA h g^(−1)at a current density of 5000 mA g^(−1)),high charge-specific capacity(907 mA h g^(−1)at 100 mA g^(−1)after 200 cycles,and a stable specific capacity of 944 mA h g^(−1)over 800 cycles,even at a high current density of 1000 mA g^(−1)),and excellent cycling stability.

关 键 词：C/Cu microspheres multiscale pore structure chitinderived carbon mesoporous Co_(3)O_(4)nanosheets anode materials 

分 类 号：TM912[电气工程—电力电子与电力传动] TB383.1[一般工业技术—材料科学与工程]