溶剂热制备绒球状ZnCo_2O_4/CNT多孔微球
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摘要
用溶剂热法制备绒球状钴酸锌(ZnCo_2O_4)/碳纳米管(CNT)复合材料。用XRD、SEM技术分析物相和形貌,用恒流充放电及循环伏安法测试电化学性能。添加CNT使ZnCo_2O_4呈多孔结构,可提高作为锂离子电池负极材料的电化学性能。以500 mA/g的电流在0.01~3.00 V循环,ZnCo_2O_4/CNT的首次充、放电比容量分别为1 002.3 mAh/g、1 284.9 mAh/g,首次库仑效率达78.00%;第50次循环的充、放电比容量分别为1 197.2 mAh/g、1 209.8 mAh/g,库仑效率达98.96%。
The cinc cobaltate(ZnCo_2O_4)/carbon nanotube( CNT) composite microspheres with porous floccule structure were prepared by solvothermal method. The phase and morphology were analyzed by XRD and SEM,the electrochemical performance was measured by galvanostatic charge-discharge and cyclic voltammetry. The porous structure of ZnCo_2O_4 was exhibited by CNT,which could improve the electrochemical performance as anode material of Li-ion battery. When cycled in 0. 01-3. 00 V with the current of 500 mA/g,the initial specific charge and discharge capacity of ZnCo_2O_4/CNT were 1 002. 3 mAh/g and 1 284. 9 mAh/g,respectively,and the initial coulombic efficiency was 78. 00%. The specific charge and discharge capacity of the 50 th cycle were 1 197. 2 mAh/g and 1 209. 8 mAh/g,and the coulombic efficiency was up to 98. 96%.
The cinc cobaltate(ZnCo_2O_4)/carbon nanotube( CNT) composite microspheres with porous floccule structure were prepared by solvothermal method. The phase and morphology were analyzed by XRD and SEM,the electrochemical performance was measured by galvanostatic charge-discharge and cyclic voltammetry. The porous structure of ZnCo_2O_4 was exhibited by CNT,which could improve the electrochemical performance as anode material of Li-ion battery. When cycled in 0. 01-3. 00 V with the current of 500 mA/g,the initial specific charge and discharge capacity of ZnCo_2O_4/CNT were 1 002. 3 mAh/g and 1 284. 9 mAh/g,respectively,and the initial coulombic efficiency was 78. 00%. The specific charge and discharge capacity of the 50 th cycle were 1 197. 2 mAh/g and 1 209. 8 mAh/g,and the coulombic efficiency was up to 98. 96%.
引文
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[4]CHEN Y M,YU L,LOU X W.Hierarchical tubular structures composed of Co3O4hollow nanoparticles and carbon nanotubes for lithium storage[J].Angew Chem Int Edit,2016,55:5 990-5 993.
[5]倪江锋,周恒辉,陈继涛,et al.锂离子电池中固体电解质界面膜(SEI)研究进展[J].化学进展,2004,16(6):335-342.
[6]BAI J,LI X G,LIU G Z,et al.Unusual formation of Zn Co2O43D hierarchical twin microspheres as a high-rate and ultralong-life lithium-ion battery anode material[J].Mater Sci Eng B,2014,24(20):3 012-3 020.
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[8]SEHRAWAT P,JULIEN C,ISLAM S S,et al.Carbon nanotubes in Li-ion batteries:a review[J].Mater Sci Eng B,2016,213:12-40.
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