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Preparation method of MnO2/Ag composite material with high specific capacity

A composite material and high specific capacity technology, applied in the field of lithium-ion batteries, can solve the problems of weak reduction, crystal transformation, and long time consumption, and achieve the effects of simple preparation method, good dispersion, and good environmental compatibility

Inactive Publication Date: 2019-09-27
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Generally, the reduction power of the illumination method is weak, and the particle size of the Ag nanoparticles reduced by the illumination method is generally large; while the reducing agent in the chemical reduction method generally has a strong reducing power, and the Ag nanoparticles reduced by this method have a small particle size. , but if the proportion of reducing agent is not controlled, it is easy to make MnO 2 Crystalline transformation occurs and the method is time-consuming

Method used

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  • Preparation method of MnO2/Ag composite material with high specific capacity
  • Preparation method of MnO2/Ag composite material with high specific capacity
  • Preparation method of MnO2/Ag composite material with high specific capacity

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] MnO 2 The preparation method of / Ag composite material, comprises the following steps:

[0031] Step 1: Mix 359 mL of 0.4 mol / L NaOH solution with 41 mL of 11 mol / L H 2 o 2 The solution was mixed, stirred evenly and mixed with 200mL concentration of 0.1mol / L Mn(NO 3 ) 2 Mix the aqueous solution, wait until the mixture is evenly stirred, let stand to obtain a black precipitate, then wash the black precipitate to neutrality, dry it in a constant temperature drying oven at 60°C for 24 hours to obtain a black powder, add the black powder to a concentration of 100mL In a 3mol / L NaOH solution, hydrothermally reacted in a high-pressure reactor at 150°C for 16 hours, and finally dried in a constant temperature oven at 60°C for 12 hours to obtain sodium manganese dioxide, which is denoted as BirMO(Na).

[0032] Step 2: The product obtained in step 1 was mixed with 100 mL of HCl solution with a concentration of 0.2 mol / L, and after continuous stirring for 3 days, the solution ...

Embodiment 2

[0039] MnO 2 The preparation method of / Ag comprises the following steps:

[0040] Step 1: Mix 359 mL of 0.6 mol / L NaOH solution with 41 mL of 9.7 mol / L H 2 o 2 The solution was mixed, stirred evenly and mixed with 200mL concentration of 0.3mol / L Mn(NO 3 ) 2 Mix the aqueous solution, wait until the mixture is evenly stirred, let stand to obtain a black precipitate, then wash the black precipitate to neutrality, dry it in a constant temperature drying oven at 60°C for 24 hours to obtain a black powder, add the black powder to a concentration of 100mL In a 2mol / L NaOH solution, hydrothermally react in a high-pressure reactor at 150°C for 16 hours, and finally dry in a constant temperature drying oven at 60°C for 12 hours to obtain sodium manganese dioxide, which is denoted as BirMO(Na).

[0041] Step 2: The product obtained in step 1 was mixed with 100 mL of HCl solution with a concentration of 0.1 mol / L, and after continuous stirring for 3 days, the solution was washed to ne...

Embodiment 3

[0048] MnO 2 The preparation method of / Ag comprises the following steps:

[0049] Step 1: Mix 359 mL of 0.5 mol / L NaOH solution with 41 mL of 9 mol / L H 2 o 2 The solution was mixed, stirred evenly and mixed with 200mL concentration of 0.3mol / L Mn(NO 3 ) 2 Mix the aqueous solution, wait until the mixture is evenly stirred, let stand to obtain a black precipitate, then wash the black precipitate to neutrality, dry it in a constant temperature drying oven at 60°C for 24 hours to obtain a black powder, add the black powder to a concentration of 100mL In a 1mol / L NaOH solution, hydrothermally react in a high-pressure reactor at 150°C for 16 hours, and finally dry in a constant temperature drying oven at 60°C for 12 hours to obtain sodium manganese dioxide, which is denoted as BirMO(Na).

[0050] Step 2: The product obtained in step 1 was mixed with 100 mL of HCl solution with a concentration of 0.15 mol / L, and after continuous stirring for 3 days, the solution was washed to neu...

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Abstract

The invention discloses a preparation method of a MnO2 / Ag composite material with high specific capacity. The preparation method comprises the following steps: 1, mixing a NaOH solution with a H2O2 solution, performing uniform stirring, mixing the mixture with a Mn (NO3) 2 aqueous solution, standing the solution, washing the solution with water, performing drying, and adding black powder into the NaOH solution; 2, mixing a product obtained at the step 1 with the HCl solution, and performing stirring and drying; 3, mixing the product obtained at the step 2 with a TMA solution, performing stirring, and washing the product with water to obtain a slurry containing dispersed MnO2 nanosheets; 4, mixing the product obtained at the step 3 with deionized water, recording the mixture as a solution A, and reacting the solution A with a NaBH4 solution to obtain a solution B; 5, mixing the solution B with a AgNO3 solution, recording the mixture as a solution C, mixing the solution C and the PVP solution, and recording the mixture as a solution D; 6, performing the illumination reaction of the solution D at the step 5, and performing uniform stirring; 7, respectively washing the solution obtained at the step 6 with water and alcohol, and finally performing drying to obtain a MnO2 / Ag compound. The product obtained by the method is good in dispersity and high in purity.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a MnO with high specific capacity 2 / Ag composite material preparation method. Background technique [0002] Lithium-ion battery is a new type of clean and renewable energy storage device, which is widely used in portable electronic equipment, power tools, defense industry due to its high output voltage, high volume and mass energy density, long cycle life, and insignificant memory effect and other fields. Electrode material is one of the important factors affecting battery performance. transition metal oxide MnO 2 Due to its high theoretical specific capacity (1232mAh / g), polymorphic structure (α, β, γ, δ, ε, λ), low cost, and environmental friendliness, it has become a research hotspot for lithium-ion battery anode materials. [0003] δ-MnO with layered structure 2 by [MnO 6 ] Octahedron coedge formed, the interlayer spacing is about 0.7nm, there are water m...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/50H01M4/66B82Y30/00H01M10/0525
CPCH01M4/366H01M4/502H01M4/661B82Y30/00H01M10/0525Y02E60/10
Inventor 夏傲宜珏赵晨鹏韩曰朋谈国强
Owner SHAANXI UNIV OF SCI & TECH
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