Preparation method of sodium manganese oxide and application of sodium manganese oxide in super capacitor

A technology of sodium manganese oxide and sodium hydroxide, applied in manganese compounds, chemical instruments and methods, hybrid capacitor electrodes, etc., can solve the problems of high economic cost, low output, and complicated process.

Inactive Publication Date: 2021-09-14
NANCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the current preparation techniques of sodium manganese oxide mainly include electrochemical oxidation, high temperature hydrothermal and other methods. These processes are cumbersome, with relatively low output and high economic costs, making it difficult to realize industrial preparation and application.

Method used

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  • Preparation method of sodium manganese oxide and application of sodium manganese oxide in super capacitor
  • Preparation method of sodium manganese oxide and application of sodium manganese oxide in super capacitor
  • Preparation method of sodium manganese oxide and application of sodium manganese oxide in super capacitor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Weigh 0.8 Kg of sodium hydroxide (NaOH) solution in 12 L of deionized water, 2.45 Kg of manganese acetate tetrahydrate (Mn(CH 3 COO) 2 • 4H 2 O) Dissolved in 3 L of deionized water, while stirring, slowly added manganese acetate tetrahydrate into the sodium hydroxide solution, after the addition of manganese acetate tetrahydrate was completed, stirred at room temperature for 1 h to obtain brown precipitate. Suspension; Then, a precipitate was obtained by suction filtration, and a brown precipitate was obtained at a drying temperature of 80 °C.

[0030] (2) Grind 1 Kg of the above-mentioned brown precipitate and 1 Kg of sodium hydroxide evenly, raise the temperature to 300 ℃ at a rate of 6 ℃ / min in an argon atmosphere, and keep it warm for 10 hours, then cool with the furnace A black sintered product was obtained at room temperature. The above-mentioned sintered product was filtered and washed 6 times to remove sodium-containing by-products in the final product, a...

Embodiment 2

[0032] (1) Weigh 0.8 Kg of sodium hydroxide (NaOH) solution in 12 L of deionized water, 2.45 Kg of manganese acetate tetrahydrate (Mn(CH 3 COO) 2 • 4H 2 O) Dissolved in 3 L of deionized water, while stirring, slowly added manganese acetate tetrahydrate into the sodium hydroxide solution, after the addition of manganese acetate tetrahydrate was completed, stirred at room temperature for 1 h to obtain brown precipitate. Suspension; Then, a precipitate was obtained by suction filtration, and a brown precipitate was obtained at a drying temperature of 80 °C.

[0033] (2) Grind 1 Kg of the above-mentioned brown precipitate and 1 Kg of sodium hydroxide evenly, in an atmosphere of argon, raise the temperature to 450°C at a rate of 6°C / min, keep it warm for 10 hours, and then cool with the furnace A black sintered product was obtained at room temperature. The above-mentioned sintered product was filtered and washed 4 times to remove sodium-containing by-products in the final produc...

Embodiment 3

[0035] (1) Weigh 0.8 Kg of sodium hydroxide (NaOH) solution in 12 L of deionized water, 2.45 Kg of manganese acetate tetrahydrate (Mn(CH 3 COO) 2 • 4H 2 O) Dissolve in 3 L of deionized water, while stirring, slowly add manganese acetate tetrahydrate into the sodium hydroxide solution, after the addition of manganese acetate tetrahydrate is completed, stir at room temperature for 1 h to obtain brown precipitate Suspension; Then, a precipitate was obtained by suction filtration, and a brown precipitate was obtained at a drying temperature of 80 °C.

[0036] (2) Grind 1 Kg of the above-mentioned brown precipitate and 1 Kg of sodium hydroxide evenly, in an atmosphere of argon, raise the temperature to 600 ℃ at a rate of 6 ℃ / min, keep it warm for 10 hours, and then cool with the furnace A black sintered product was obtained at room temperature. The above-mentioned sintered product was filtered and washed 5 times to remove sodium-containing by-products in the final product, and t...

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Abstract

The invention relates to a preparation method of a sodium manganese oxide and an application of the sodium manganese oxide in a super capacitor. The preparation method comprises the steps of firstly, employing a coprecipitation method to mix a divalent manganese salt and a sodium hydroxide solution to form a Mn (OH) 2 suspension, and then carrying out washing-solid-liquid separation for several times to obtain Mn (OH) 2 precipitate powder; and grinding the precipitate and sodium hydroxide, sintering in an argon atmosphere at 300-900 DEG C to obtain a product, cooling to room temperature, taking out the product, washing with water for several times, and drying in a vacuum drying oven to obtain the manganese oxide doped with high sodium content. The prepared sodium manganese oxide is prepared into an electrode to form an asymmetric water system supercapacitor together with an activated carbon electrode, so that the electrochemical performance of the device is favorably improved. The sodium manganese oxide prepared by the method is low in cost, has the advantages of high specific capacitance, wide charge-discharge voltage window, long cycle service life and the like in an aqueous electrolyte, is simple in preparation process, and can realize macro-scale preparation.

Description

technical field [0001] The invention belongs to the technical field of electrode materials and electrochemistry, and in particular relates to a sodium manganese oxide material and a preparation method thereof. Background technique [0002] Water-based supercapacitors have good application prospects in electric vehicles, electromagnetic pulses, and large-scale energy storage due to their advantages such as high power density, fast charge-discharge rate, ultra-long cycle life, safety and environmental protection. However, the narrow electrochemical stability window and low energy density of water limit its wide application. Electrode materials are the key factors determining the performance of supercapacitors, and the development of electrode materials with wide electrochemical windows and high capacity is an effective strategy to increase energy density. Among many supercapacitor electrode materials, manganese oxides have attracted extensive attention due to their abundant r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G45/12H01G11/46B82Y40/00
CPCC01G45/1221H01G11/46B82Y40/00C01P2004/32C01P2006/40C01P2006/80Y02E60/13
Inventor 谈利承陈义旺彭钟有
Owner NANCHANG UNIV
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