Nitrogen-doped carbon-coated hollow porous silicon dioxide/cobalt nano composite material and lithium ion battery negative electrode material thereof

A technology of silica and composite materials, applied in battery electrodes, secondary batteries, nanotechnology for materials and surface science, etc., can solve the problems that hinder the large-scale application of LIBs anode materials, low initial Coulombic efficiency, and volume expansion effects. It can achieve the effect of enhancing the kinetic process of electrode reaction, shortening electron and ion transport paths, and enhancing rate performance.

Active Publication Date: 2020-07-24
YANGZHOU UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, the inherent low conductivity, large volume expansion effect, and low initial Coulombi

Method used

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  • Nitrogen-doped carbon-coated hollow porous silicon dioxide/cobalt nano composite material and lithium ion battery negative electrode material thereof
  • Nitrogen-doped carbon-coated hollow porous silicon dioxide/cobalt nano composite material and lithium ion battery negative electrode material thereof
  • Nitrogen-doped carbon-coated hollow porous silicon dioxide/cobalt nano composite material and lithium ion battery negative electrode material thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] In this example, the hollow hollow SiO 2 、HSiO 2 / Co and HSiO 2 / Co@NC Composites.

[0028] First, prepare hollow porous silica microspheres: measure and mix 0.4 mL of ammonia water with a mass concentration of 25 % and 0.2 g of resorcinol respectively, and then add 28 mL of a 3:4 volume ratio to the mixed solution. Mix solution of water, ethanol and deionized water, then magnetically stir at room temperature for 30 minutes, then add 0.28 mL of formaldehyde dropwise under stirring to make the reaction more complete, and after stirring for 10 minutes, slowly add 0.4 mL of formaldehyde at a rate of 5 minutes per drop Tetraethyl orthosilicate (TEOS) and 0.1 g cetyltrimethylammonium bromide (CTAB) were added to the mixed solution, and after rapid stirring for 1 h, the solution was transferred to a muffle furnace and heated at 80 Anneal at ℃ for 24 h; centrifuge to separate the solid phase precipitate, wash the precipitate three times with deionized water and absolute eth...

Embodiment 2

[0036] In the present embodiment, with the HSiO that embodiment 1 makes 2 / Co@NC composite material was used as the negative electrode of lithium-ion battery for lithium-ion battery assembly, and the performance of the battery material was tested.

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Abstract

The invention relates to a nitrogen-doped carbon-coated hollow porous silicon dioxide/cobalt nano composite material and a lithium ion battery negative electrode material thereof. The preparation method of the nitrogen-doped carbon-coated hollow porous silicon dioxide/cobalt nano composite material comprises the following steps: by taking tetraethyl silicate as a silicon source, cobalt acetylacetonate as a cobalt source, dopamine hydrochloride as a carbon source and N,N-dimethylformamide as a solvent, reacting under a hydrothermal condition, and sequentially preparing hollow-hollow porous silicon dioxide spheres, a hollow-hollow porous silicon dioxide/cobalt composite material and a nitrogen-doped carbon-coated hollow-hollow porous silicon dioxide/cobalt nano composite material. The composite material prepared by the invention is prepared by a step-by-step growth step, has excellent cycling stability and rate capability as a lithium ion battery negative electrode, and is low in manufacturing cost, simple in process, low in equipment requirement and environment-friendly.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery materials, in particular to a nitrogen-doped carbon-coated hollow hollow silicon dioxide / cobalt nanocomposite material and a lithium-ion battery negative electrode material. Background technique [0002] In order to meet the increasing energy demands of human beings, especially the booming electric vehicle market in recent years, it is crucial to develop a new generation of lithium-ion batteries (LIBs) with excellent performance. As an important part of lithium-ion batteries, negative electrode materials affect the electrochemical performance of the entire battery. Traditional LIBs made of graphite materials have a low specific capacity (372mA h g -1 ), it is difficult to meet the increasingly high application requirements of LIBs in portable electronic devices, electric vehicles, and large-scale energy storage. Therefore, looking for a negative electrode material with low cost, high...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/48H01M4/62H01M10/0525B82Y30/00
CPCH01M4/366H01M4/483H01M4/625H01M4/626H01M10/0525B82Y30/00H01M2004/021H01M2004/027Y02E60/10
Inventor 杨占军杜静静李娟
Owner YANGZHOU UNIV
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