Positive host material and preparation method and application thereof

A technology of host materials and positive active materials, applied in battery electrodes, electrical components, non-aqueous electrolyte batteries, etc., can solve problems such as low active material utilization, commercialization process limitations, low electronic conductivity, etc. The effect of large-scale production application, promotion of rapid transformation, and simple preparation method

Active Publication Date: 2020-07-28
中科南京绿色制造产业创新研究院 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the defects of the lithium-sulfur battery (Li-S battery) system have greatly restricted its commercialization process.
These include, however, the low electronic conductivity of elemental sulfur and the high solubility of polysulfide ions resulting in faster decay and lower active material utilization

Method used

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  • Positive host material and preparation method and application thereof
  • Positive host material and preparation method and application thereof
  • Positive host material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] This embodiment provides a method for preparing a positive electrode host material, comprising the following steps:

[0064] (1) Dissolve 0.874g of zinc nitrate hexahydrate, 0.549g of ferrous chloride tetrahydrate and 0.75g of ascorbic acid in 80mL of deionized water, stir until the solution is clear, and obtain a light green solution;

[0065] (2) 3.936 g of 2-methylimidazole was dissolved in 80 mL of deionized water, and stirred until the solution was clear to obtain an aqueous solution of 2-methylimidazole;

[0066] (3) Pour the 2-methylimidazole aqueous solution obtained in step (2) into the light green solution obtained in step (1) to obtain a dark brown solution, and leave it for 24 hours to obtain a pre-product;

[0067] (4) The pre-product obtained in step (3) is suction filtered to remove the supernatant, and the obtained precipitate is dispersed in the ethanol / water mixed solution, then suction filtered, and washed repeatedly for four times until the precipita...

Embodiment 2

[0072] (1) Dissolve 0.582g of zinc nitrate hexahydrate, 0.396g of ferrous chloride tetrahydrate and 0.75g of ascorbic acid in 80mL of deionized water, stir until the solution is clear, and obtain a light green solution;

[0073] (2) 3.936 g of 2-methylimidazole was dissolved in 80 mL of deionized water, and stirred until the solution was clear to obtain an aqueous solution of 2-methylimidazole;

[0074] (3) Pour the 2-methylimidazole aqueous solution obtained in step (2) into the light green solution obtained in step (1) to obtain a dark brown solution, and leave it for 24 hours to obtain a pre-product;

[0075] (4) The pre-product obtained in step (3) is suction filtered to remove the supernatant, and the obtained precipitate is dispersed in the ethanol / water mixed solution, then suction filtered, and washed repeatedly for four times until the precipitate becomes light yellow completely, and the Placed in a blast drying oven at 60°C for 12 hours to obtain the flower-like prec...

Embodiment 3

[0080] (1) Dissolve 0.582g of zinc nitrate hexahydrate, 0.792g of ferrous sulfate and 0.75g of ascorbic acid in 80mL of deionized water, stir until the solution is clear, and obtain a light green solution;

[0081] (2) 3.936 g of 4-methylimidazole was dissolved in 80 mL of deionized water, and stirred until the solution was clear to obtain an aqueous solution of 4-methylimidazole;

[0082] (3) Pour the 4-methylimidazole aqueous solution obtained in step (2) into the light green solution obtained in step (1) to obtain a dark brown solution, and leave it to stand for 48 hours to obtain a pre-product;

[0083] (4) The pre-product obtained in step (3) is suction filtered to remove the supernatant, and the obtained precipitate is dispersed in the ethanol / water mixed solution, then suction filtered, and washed repeatedly for four times until the precipitate becomes light yellow completely, and the Place in a blast drying oven at 50°C and dry for 24 hours to obtain a flower-like prec...

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Abstract

The invention provides a positive host material and a preparation method and application thereof. The preparation method of the positive host material comprises the following steps: (1) adding metal salt, ferrite, ascorbic acid and an imidazole compound into water, mixing and reacting to obtain a flower-like precursor; and (2) carrying out high-temperature treatment on the flower-like precursor obtained in the step (1) to obtain the positive host material. According to the invention, ascorbic acid is added in the preparation process; a flower-like precursor with a specific morphology is obtained; the compactness and thickness of lamellar stacking are regulated and controlled by controlling the amounts of ferrite and ascorbic acid, and in the high-temperature treatment process, a large-sizepositive host material can be anchored on the surface layer by utilizing a carbon source and a catalyst in a flower-shaped precursor of the positive host material without additionally adding the carbon source and the catalyst, and the positive host material is obtained in a hollow carbon tube; the positive host material is applied to the lithium-sulfur battery, and the electrochemical performanceof the lithium-sulfur battery can be improved.

Description

technical field [0001] The invention belongs to the field of batteries and relates to a positive electrode host material and its preparation method and application, in particular to a positive electrode host material, a positive electrode active material and its preparation method and application. Background technique [0002] The increasingly serious energy crisis and environmental problems make people start to look for more efficient energy utilization and actively develop renewable new energy, so as to achieve sustainable economic development. However, due to current technical limitations, fossil fuels still have low energy utilization and serious emissions of nitrogen oxides and sulfur oxides. Therefore, new energy sources (including wind energy, nuclear energy, solar energy, geothermal energy, etc.) have begun to be studied more and more and develop rapidly. But this type of new energy also has its own limitations, such as energy instability, energy storage problems, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/525H01M4/583H01M4/62H01M10/052
CPCH01M4/366H01M4/525H01M4/583H01M4/625H01M10/052Y02E60/10
Inventor 王宝高一博郑淑敏
Owner 中科南京绿色制造产业创新研究院
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