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A kind of egg yolk shell structure potassium ion battery negative electrode material and preparation method thereof

A battery negative electrode, egg yolk shell technology, applied in battery electrodes, structural parts, secondary batteries, etc., can solve the problems of low specific capacity, high specific capacity, climate warming environment, etc., to suppress volume expansion, improve conductivity, The effect of the method is easy to operate

Inactive Publication Date: 2020-11-27
UNIV OF SCI & TECH BEIJING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are three prominent problems in the development and utilization of traditional fossil energy such as coal, oil, and natural gas: resource depletion, climate warming, and environmental pollution.
At present, the anode materials of potassium ion batteries are carbon materials with excellent performance, but their theoretical specific capacity is low, which cannot meet the demand of high energy density.
Transition metal sulfides have attracted much attention due to their low cost and high specific capacity, but their low electrical conductivity and severe volume expansion during cycling

Method used

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  • A kind of egg yolk shell structure potassium ion battery negative electrode material and preparation method thereof
  • A kind of egg yolk shell structure potassium ion battery negative electrode material and preparation method thereof
  • A kind of egg yolk shell structure potassium ion battery negative electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Weigh polyvinylpyrrolidone (K30) and ferric nitrate nonahydrate according to a mass ratio of 1:1.8, dissolve ferric nitrate nonahydrate and polyvinylpyrrolidone nonahydrate in deionized water and stir ultrasonically for 8 minutes to form a mixed solution, and then place the mixed solution in a dry box Keep warm at 80°C until it is completely dry, then grind into powder and transfer the powder to a crucible. / min heating rate to 850°C, heat preservation 2h, after the tube furnace cools down, the black foamy product is collected, and the three-dimensional graphene composite material decorated with iron nanoparticles is obtained. Then weigh the three-dimensional graphene composite material and cysteine ​​modified by iron nanoparticles at a mass ratio of 1:10 and pour it into the hydrothermal reaction kettle, add 40ml deionized water and stir and mix evenly, and place the hydrothermal reaction kettle after sealing. Heat it in an oven to 200°C and keep it warm for 18 hours. ...

Embodiment 2

[0031] Weigh polyvinylpyrrolidone (K30) and ferric nitrate nonahydrate according to a mass ratio of 1:1.8, dissolve ferric nitrate nonahydrate and polyvinylpyrrolidone nonahydrate in deionized water and stir ultrasonically for 8 minutes to form a mixed solution, and then place the mixed solution in a dry box Keep warm at 80°C until it is completely dry, then grind into powder and transfer the powder to a crucible. / min heating rate to 900 ° C, heat preservation 2h, after the tube furnace cools down, collect the black foamy product, and obtain the three-dimensional graphene composite material decorated with iron nanoparticles. Then weigh the three-dimensional graphene composite material and cysteine ​​modified by iron nanoparticles at a mass ratio of 1:10 and pour it into the hydrothermal reaction kettle, add 40ml deionized water and stir and mix evenly, and place the hydrothermal reaction kettle after sealing. Heat it in an oven to 200°C and keep it warm for 18 hours. After th...

Embodiment 3

[0033] Weigh polyvinylpyrrolidone (K30) and ferric nitrate nonahydrate according to a mass ratio of 1:2, dissolve ferric nitrate nonahydrate and polyvinylpyrrolidone in deionized water and stir ultrasonically for 8 minutes to form a mixed solution, and then place the mixed solution in a dry box Keep warm at 80°C until it is completely dry, then grind into powder and transfer the powder to a crucible. / min heating rate to 900 ° C, heat preservation 2h, after the tube furnace cools down, collect the black foamy product, and obtain the three-dimensional graphene composite material decorated with iron nanoparticles. Then weigh the three-dimensional graphene composite material and cysteine ​​modified by iron nanoparticles at a mass ratio of 1:10 and pour it into the hydrothermal reaction kettle, add 40ml deionized water and stir and mix evenly, and place the hydrothermal reaction kettle after sealing. Heat it in an oven to 200°C and keep it warm for 18 hours. After the reactor is c...

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Abstract

The invention discloses a yolk shell structure potassium ion battery negative electrode material and a preparation method thereof, and belongs to the field of potassium ion batteries. The preparationmethod comprises the following specific steps: dissolving iron nitrate nonahydrate and polyvinylpyrrolidone (K30) in deionized water to prepare a mixed solution, drying the mixed solution, grinding the mixed solution into powder, putting the powder into a tubular furnace, and heating and preserving heat in a hydrogen-argon mixed atmosphere to obtain iron nanoparticle modified three-dimensional graphene; weighing the iron nanoparticle modified three-dimensional graphene material and a sulfur source precursor according to a certain mass ratio, and putting into a hydrothermal reaction kettle; andadding a proper amount of deionized water, uniformly stirring and mixing, sealing, keeping the hydrothermal reaction kettle at a certain temperature for a certain time, and centrifugally cleaning theobtained precipitate with deionized water and absolute ethyl alcohol for multiple times to obtain the three-dimensional graphene / iron sulfide negative electrode material with the yolk shell structure. The material prepared by the preparation method is low in production cost, high in repeatability and novel in material structure, shows excellent performance when serving as the negative electrode of the potassium ion battery, and is wide in application prospect.

Description

technical field [0001] The invention belongs to the field of potassium ion batteries, and in particular relates to an egg yolk shell structure potassium ion battery negative electrode material and a preparation method thereof. Background technique [0002] With the continuous development of the economy and the continuous progress of science and technology, the demand for energy is gradually increasing. However, there are three prominent problems in the development and utilization of traditional fossil energy such as coal, oil, and natural gas: resource depletion, climate warming, and environmental pollution. The development of renewable energy such as solar energy, wind energy and tidal energy is an inevitable trend to solve the outstanding problems faced by non-renewable energy and ensure the sustainable development of human beings. However, these renewable energy sources are highly dependent on weather and climate, and have volatility and randomness. Therefore, there is a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/62H01M10/054C01B32/182
CPCC01B32/182H01M4/366H01M4/5815H01M4/625H01M10/054Y02E60/10
Inventor 李平韩坤刘双宇李慧徐丽曲选辉
Owner UNIV OF SCI & TECH BEIJING