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Preparation method and application of a spindle-shaped cobalt-manganese oxide composite material
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A technology of cobalt manganese oxide and composite materials, which is applied in the manufacture of hybrid/electric double layer capacitors and electrodes of hybrid capacitors. The effect of adsorption, guaranteed specific capacitance performance, and simple preparation method
Active Publication Date: 2021-01-05
GUILIN UNIV OF ELECTRONIC TECH
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However, this method has significant technical defects: 1. The strong alkaline electrolyte is highly corrosive and requires high production equipment; 2. The viscosity of the high-concentration electrolyte is high, which affects the charge transmission; 3. There is a risk of environmental pollution and cost
[0004] Reducing the concentration of electrolyte can not effectively solve the above problems, prior art Jagadale, A.D. et al. ], 406: 225-230.) Co 3 o 4 Material, under the condition of 1 M KOH electrolyte, test the capacitance performance, the obtained specific capacitance is only 365 F / g, and the performance drops significantly
The reason is that it is impossible to maintain Co 3 o 4 The microstructure of the material, leading to performance degradation
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Embodiment 1
[0045] A preparation method of a spindle-shaped cobalt-manganese oxide composite material, comprising the following steps:
[0046] Step 1) Preparation of the complex, weigh 1g of cobalt acetate and 1g of triammonium citrate, put them into 40mL of distilled water, and stir until transparent. Then pour the solution into the reaction kettle, set the program: the reaction temperature is 120°C, the reaction time is 15h, after the reaction is completed, filter and dry;
[0047] Step 2) Combination of manganese element and complex, the cobalt acetate and triammonium citrate complex obtained in step 1) and MnCl 2· 4H 2 O, KMnO 4 Mix with water, wherein powder of cobalt acetate and triammonium citrate complex, MnCl 2· 4H 2 O, KMnO 4 , The mass ratio of water is 1:0.5:0.5:20 and stirred for 1 hour; then put it into the reaction kettle, react at the reaction temperature of 150°C and the reaction time of 14 hours, after the reaction is completed, filter and dry;
[0048] Step 3) Pr...
Embodiment 2
[0059] The preparation method of the spindle-shaped cobalt-manganese oxide composite material at different calcination temperatures, the steps not specifically described in the specific steps are the same as the preparation method of this example 1, the difference is: step 3) the calcination temperature is 200°C.
[0060] In order to compare the influence of different calcination temperatures on the electrode material, the cobalt-manganese oxide composite material prepared in Example 2 was prepared into an electrode sheet, and the preparation method of the electrode sheet was the same as that of the electrode sheet in Example 1.
[0061] Test results such as Figure 7 As shown, the specific capacitance is 0.702F / cm 2 .
Embodiment 3
[0063] The preparation method of the spindle-shaped cobalt-manganese oxide composite material at different calcination temperatures, the steps not specifically described in the specific steps are the same as the preparation method of this example 1, the difference is: step 3) the calcination temperature is 300°C.
[0064] In order to compare the influence of different calcination temperatures on the electrode material, the cobalt-manganese oxide composite material prepared in Example 3 was prepared into an electrode sheet, and the preparation method of the electrode sheet was the same as that of the electrode sheet in Example 1.
[0065] Test results such as Figure 7 As shown, the specific capacitance is 0.683F / cm 2 .
[0066] pass Figure 7 In comparison, the specific capacitance of the spindle-shaped cobalt-manganese oxide composite material prepared by implementing 1 is 0.725F / cm 2 , which is greater than the specific capacitance of the cobalt-manganese oxide composite ...
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Abstract
The invention discloses a spindle-like cobalt-manganese oxide composite material. The spindle-shaped cobalt-manganese oxide composite material is complexed by cobalt acetate and ammonium citrate tribasic and then is loaded by Mn to obtain a cobalt oxide composite material, wherein the composite material is of a spindle-shaped structure, and a carbon material is in a spindle-shaped structure; the Mn is prepared from MnCl2.4H2O and KMnO4 through in-situ preparation, and then is directly loaded with cobalt acetate and ammonium citrate tribasic complex; the preparation method comprises the following steps of 1) preparing a complex; 2) carrying out compounding on a manganese element and the complex; and 3) preparing the spindle-like cobalt-manganese oxide composite material. The material is applied as a supercapacitor electrode material, and in 1M of KOH solution, charging and discharging are performed in a range of minus 0.1V to 0.5V, the specific capacitance is 410-440F / g at the discharging current density of 4A / g. The preparation method is simple and low in cost, and is suitable for mass production; the waste of the cobalt-manganese material is reduced; the spindle-shaped morphologyis obtained; and Mn is loaded, the Co3O4 structure is protected, the concentration of the electrolyte is reduced, and the method has a very high practical application value.
Description
technical field [0001] The invention relates to the technical field of supercapacitors, in particular to a spindle-shaped cobalt-manganese oxide composite material and its preparation method and application. Background technique [0002] Supercapacitors are efficient and practical energy storage devices with advantages such as short charging time, long service life, and good temperature characteristics. With the increasingly prominent problems of energy shortage and environmental pollution, supercapacitors that are environmentally friendly, non-polluting, and have a high cycle life have become a hot research topic in the energy field today. At present, the key factors affecting the development of supercapacitors are mainly electrode materials, electrolytes, and diaphragms. The preparation of electrode materials directly determines the size of the capacitor capacity, and is also one of the most critical factors affecting supercapacitors. According to the difference of electr...
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