Electrode material preparation method, electrode material and capacitor

Abstract

The invention provides a preparation method of an electrode material. The method comprises the following steps: S1, preparing a spherical cobalt-nickel complex; and S2, adding the cobalt-nickel complex obtained in the step S1 into a tetrafluoroethylene reaction kettle filled with a KOH solution, and carrying out a heating reaction to obtain the prepared electrode material. The preparation method of the electrode material provided by the invention gets rid of the limitation of an existing cobalt hydroxide nickel electrode material precursor, can directly realize the synthesis of a high-stability cobalt hydroxide electrode material, and is simpler and more efficient than a traditional method of firstly generating hydroxide and then compounding a high-stability material; the prepared composite material has more excellent electrochemical performance; the hydroxide subjected to alkaline hydrolysis of the complex can maintain the morphology of the complex precursor, so that the morphology of the hydroxide can be more conveniently regulated and controlled.

Description

technical field [0001] The invention relates to the field of material preparation, in particular to an electrode material preparation method, an electrode material and a capacitor. Background technique [0002] In order to solve the problems of energy shortage and environmental pollution, environmentally friendly and sustainable new energy sources have attracted much attention. Accordingly, research and development of high-performance, low-cost energy storage devices has become a current research hotspot. Among many energy storage devices, supercapacitors are favored by researchers due to their advantages of fast charging and ultra-high power density. They have received extensive attention in portable electronic devices and hybrid vehicles, and are expected to become the next generation of mainstream energy storage devices. In the actual production and application of supercapacitors, their relatively poor stability and energy density greatly limit the development. Therefore...

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Problems solved by technology

However, this method is difficult to achieve the complete exchange of ligand ions in MOF, so both the stability and the specific capacitance are not satisfactory.

[0006] The third commonly used method is to combine highly stable electrode materials with cobalt-nickel hydroxide. Mei et al. successfully converted cobalt-nickel hydroxide into a composite material of cobalt-nickel hydroxide and nickel cobaltate by using hydrothermal method. The composite material has a specific capacitance of 1315F / g at a current density of 5A / g, and 10,000 cycles at this current density can still maintain 90.7% of the initial capacity, which is nearly as stable as that of pure cobalt-nickel hydroxide. double, but this method is cumbersome, difficult to control, and difficult to achieve large-scale application

[0007] In summary, in the above methods, the optimization of cobalt nickel hydroxide material cannot really solve the problem of the stability of cobalt nickel hydroxide simply and efficiently, and the above methods have strict requirements on the processing process, making it difficult to achieve large-scale application

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