镍氧化物复合物的制备及电容性能研究

发布时间：2018-04-09 09:48

本文选题：氧化镍　切入点：氧化铜　出处：《中南大学》2014年硕士论文

【摘要】：超级电容器作为一种新型储能装置,因其高功率密度和循环寿命长,成为最有前景的储能技术之一。金属氧化物因其成本低、资源丰富、环境友好以及具有比较高的理论比容量,吸引了大量的研究者的兴趣。本论文制备Ni-Cu和Ni-Co混合氧化物,对电极材料的微观结构和形貌进行表征,利用循环伏安法、恒电流充放电和电化学阻抗等方法测试其电化学性能。主要内容如下： 1.利用共沉淀法制备了NiO-CuO复合物,并对电极材料进行表征。研究发现,复合物是由微球组成的,并且比表面积高达132m2/g。电化学测试显示,复合物在1A/g的电流密度下,最大比电容可达到735F/g,比氧化镍(351F/g)和氧化铜(262F/g)的比电容都高。在1A/g的电流密度下,充放电循环580次后,复合物仍能保持原比电容的98.2%。 2.采用溶液法制备Ni-Cu混合氧化物。研究发现,镍的氧化物附着在氧化铜的表面。复合物是球形和多孔结构。恒流充放电测试结果表明,复合物在1A/g的电流密度下,最大比电容可达到1131F/g,比氧化铜(262F/g)的比电容高。在1和16A/g的电流密度下,充放电循环1000次后,复合物分别保持原比电容的99.6和100%,而氧化铜只能保持92.3%。复合物电化学性能表明氧化铜和镍的氧化物之间的协同效应导致比电容和循环稳定性的提高。 3.采用溶液法制备Ni-Co混合氧化物。研究发现镍的氧化物附着在四氧化三钻的表面。复合物由一维结构和颗粒状物质构成,并且具有较高的比表面积(70m2/g)。恒流充放电测试结果表明,复合物电极在2A/g电流密度下,最大比电容可达到1112F/g,比四氧化三钻(360F/g)的比电容高。在2A/g的电流密度下,充放电循环1000次后,复合物仍能保持原比电容的97%,而四氧化三钴只能保持95.9%。复合物电化学性能表明四氧化三钴和镍的氧化物之间的协同效应导致比电容和循环稳定性的提高。
[Abstract]:As a new type of energy storage device, supercapacitor has become one of the most promising energy storage technologies due to its high power density and long cycle life.Metal oxides have attracted a lot of researchers because of their low cost, rich resources, environmental friendliness and high theoretical specific capacity.In this paper, Ni-Cu and Ni-Co mixed oxides were prepared, and the microstructure and morphology of the electrode materials were characterized. The electrochemical properties were measured by cyclic voltammetry, constant current charge-discharge and electrochemical impedance.The main contents are as follows:1.NiO-CuO composites were prepared by coprecipitation and the electrode materials were characterized.The complex is composed of microspheres and has a specific surface area of 132 m2 / g.Electrochemical measurements showed that the maximum specific capacitance of the composite was 735F / g at the current density of 1A/g, which was higher than that of nickel oxide 351F / g and copper oxide 262Fr / g.At the current density of 1A/g, the complex can maintain 98.2 of the original capacitance after 580th cycle of charge and discharge.2.Ni-Cu mixed oxides were prepared by solution method.It is found that the oxide of nickel adheres to the surface of copper oxide.The complex is spherical and porous.The constant current charge-discharge test results show that the maximum specific capacitance of the composite can reach 1131 F / g at the current density of 1A/g, which is higher than that of copper oxide 262 F / g.At the current density of 1 and 16A/g, after 1000 cycles, the complex maintained 99.6 and 100 of its original capacitance, respectively, while copper oxide could only maintain 92.3 percent.The electrochemical properties of the composite show that the synergistic effect between the oxides of copper oxide and nickel leads to the improvement of specific capacitance and cycle stability.3.Ni-Co mixed oxides were prepared by solution method.It is found that the oxide of nickel adheres to the surface of trioxide trioxide.The composite is composed of one-dimensional structure and granular material, and has a high specific surface area of 70 m2 / g 路g ~ (-1).The constant current charge-discharge test results show that the maximum specific capacitance of the composite electrode can reach 1112F / g at 2A/g current density, which is higher than that of 360F / g trioxide.At the current density of 2A/g, after 1000 cycles of charge and discharge cycles, the complex can maintain the original capacitance of 97 and cobalt tetroxide can only keep 95.9.The electrochemical properties of the composite show that the synergistic effect between cobalt tetroxide and nickel oxide leads to the improvement of specific capacitance and cycle stability.
【学位授予单位】：中南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TQ138.13;TM53

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