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Preparation method of nanometer flaky manganese oxide material and application of nanosheet-shaped manganese oxide material in aqueous zinc ion battery

A nano-flaky, manganese oxide technology, applied in manganese oxide/manganese hydroxide, battery electrodes, nanotechnology, etc., can solve the problems of high cost and unsuitable for large-scale mass production.

Active Publication Date: 2021-07-13
TIANJIN UNIV
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  • Description
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Problems solved by technology

However, nanosheet δ-MnO 2 The preparation method generally adopts hydrothermal reaction that requires high temperature and high pressure, which is not suitable for large-scale batch production, and the cost is high. Therefore, a low-cost, safe and efficient synthesis method was found to prepare nanosheet δ-MnO with excellent properties. 2 Electrode materials will contribute to the industrial application of aqueous zinc-manganese batteries

Method used

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  • Preparation method of nanometer flaky manganese oxide material and application of nanosheet-shaped manganese oxide material in aqueous zinc ion battery
  • Preparation method of nanometer flaky manganese oxide material and application of nanosheet-shaped manganese oxide material in aqueous zinc ion battery
  • Preparation method of nanometer flaky manganese oxide material and application of nanosheet-shaped manganese oxide material in aqueous zinc ion battery

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Effect test

Embodiment 1

[0032] 1) Preparation of solution: Dissolve 0.02mol of manganese chloride tetrahydrate in 96mL of absolute ethanol, then add 4mL of 30wt% aqueous hydrogen peroxide and mix evenly to obtain a mixed ethanol solution of manganese chloride and hydrogen peroxide. Wherein, the ethanol concentration of manganese chloride is 0.2M, and the ethanol concentration of hydrogen peroxide is 0.4M. Subsequently, 0.04 mol of sodium hydroxide was dissolved in 40 mL of absolute ethanol to obtain a 1M ethanol solution of sodium hydroxide.

[0033] 2) Preparation of nanoparticle-like δ-MnO 2 : At room temperature and normal atmospheric pressure, the sodium hydroxide ethanol solution is mixed with the ethanol solution mixed with manganese chloride and hydrogen peroxide in stirring to carry out coprecipitation reaction, wherein the divalent manganese ion, sodium hydroxide and hydrogen peroxide The amount ratio of substances is 1:2:2. After the reaction was over, the stirring was continued for 6h. ...

Embodiment 2

[0037] 1) Preparation of solution: Dissolve 0.04mol of manganese nitrate tetrahydrate in 88mL of absolute ethanol, then add 12mL of 30wt% hydrogen peroxide aqueous solution and mix evenly to obtain a mixed ethanol solution of manganese nitrate and hydrogen peroxide. Wherein, the ethanol concentration of manganese nitrate is 0.4M, and the ethanol concentration of hydrogen peroxide is 1.2M. Subsequently, 0.08 mol of sodium hydroxide was dissolved in 40 mL of absolute ethanol to obtain a 2M ethanol solution of sodium hydroxide.

[0038] 2) Preparation of nanoparticle-like δ-MnO 2 : At room temperature and normal atmospheric pressure, mix the ethanol solution of sodium hydroxide with the ethanol solution mixed with manganese nitrate and hydrogen peroxide in stirring, and carry out coprecipitation reaction, wherein the substances of divalent manganese ions, sodium hydroxide and hydrogen peroxide The amount ratio is 1:2:3. After the reaction was completed, stirring was continued f...

Embodiment 3

[0042] 1) Preparation of solution: Dissolve 0.03 mol of manganese sulfate tetrahydrate in 94 mL of absolute ethanol, then add 6 mL of 30 wt % aqueous hydrogen peroxide and mix well to obtain a mixed ethanol solution of manganese sulfate and hydrogen peroxide. Wherein, the ethanol concentration of manganese sulfate is 0.3M, and the ethanol concentration of hydrogen peroxide is 0.6M. Subsequently, 0.06 mol of sodium hydroxide was dissolved in 40 mL of absolute ethanol to obtain a 1.5 M sodium hydroxide ethanol solution.

[0043] 2) Preparation of nanoparticle-like δ-MnO 2 : At room temperature and normal atmospheric pressure, the ethanol solution of sodium hydroxide and the ethanol solution mixed with manganese sulfate and hydrogen peroxide are mixed for coprecipitation reaction, wherein the substances of divalent manganese ions, sodium hydroxide and hydrogen peroxide The amount ratio is 1:2:2. After the reaction was over, the stirring was continued for 10 h. The precipitate ...

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Abstract

The invention relates to a preparation method of a nanometer flaky manganese oxide material and application of the nanometer flaky manganese oxide material in an aqueous zinc ion battery. The method comprises the following steps: adding a divalent manganese salt and a hydrogen peroxide solution into absolute ethyl alcohol, and conducting uniform mixing to form an ethanol solution in which the divalent manganese salt and hydrogen peroxide are mixed; dissolving sodium hydroxide in an ethanol solution to form an ethanol solution of sodium hydroxide; mixing the ethanol solution of sodium hydroxide with the ethanol solution of divalent manganese salt and hydrogen peroxide under stirring, and carrying out a co-precipitation reaction; performing centrifugal washing and then conducting drying to obtain nanoparticle-shaped delta-MnO2; and dispersing the obtained nanoparticle-shaped delta-MnO2 in an acid solution, carrying out heating and stirring at 40-70 DEG C, performing centrifugal washing, and conducting drying at 40-80 DEG C to obtain the nanometer flaky delta-MnO2. The invention also discloses the application of the prepared nanometer flaky delta-MnO2 in the aqueous zinc ion battery. The nanometer flaky delta-MnO2 has excellent rate capability and cycling stability, and shows good application prospects.

Description

technical field [0001] The invention belongs to the technical field of zinc ion batteries, in particular to a nanosheet δ-MnO 2 The preparation method of the material and its application in the positive electrode material of the aqueous zinc-ion battery. Background technique [0002] Rechargeable aqueous zinc batteries due to their low cost, high specific capacity of the zinc anode (820mAh g -1 ) and the non-flammability properties of aqueous electrolytes have become very promising candidates for large-scale stationary energy storage devices. MnO 2 Due to its high abundance, low cost, low toxicity, and high theoretical specific capacity, cathode materials have been widely used in the research of aqueous zinc-ion batteries. [0003] However, currently commercially available MnO 2 The particle size is large, and the conductivity and charge-discharge capacity are low. Therefore, in recent years, some studies have devoted to changing the MnO 2 microstructure, thereby impro...

Claims

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Application Information

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IPC IPC(8): C01G45/02H01M4/50B82Y30/00B82Y40/00
CPCC01G45/02H01M4/50H01M10/36H01M10/38B82Y30/00B82Y40/00Y02E60/10
Inventor 蔡舒左佑刘鹏博凌磊田梦王重言
Owner TIANJIN UNIV
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