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A nitrogen-doped carbon-coated hollow hollow silica/cobalt nanocomposite and its negative electrode material for lithium ion batteries

A silicon dioxide, nitrogen-doped carbon technology, 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, volume Expansion effect is large and other problems, to achieve the effect of enhancing the kinetic process of electrode reaction, shortening electron and ion transport paths, and mitigating huge changes

Active Publication Date: 2022-07-05
YANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the inherent low conductivity, large volume expansion effect, and low initial Coulombic efficiency of silica seriously hinder its large-scale application as anode material for LIBs.

Method used

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  • A nitrogen-doped carbon-coated hollow hollow silica/cobalt nanocomposite and its negative electrode material for lithium ion batteries
  • A nitrogen-doped carbon-coated hollow hollow silica/cobalt nanocomposite and its negative electrode material for lithium ion batteries
  • A nitrogen-doped carbon-coated hollow hollow silica/cobalt nanocomposite and its negative electrode material for lithium ion batteries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] In this example, hollow hollow SiO was prepared in sequence 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, and then add 28 mL of 3:4 volume ratio of the mixed solution to the mixed solution. The mixed solution of water ethanol and deionized water was then magnetically stirred for 30 min at room temperature, and 0.28 mL of formaldehyde was added dropwise with stirring to make the reaction more complete. 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 Annealed at ℃ for 24 h; after centrifugation to separate the solid phase precipitate, the precipitate was washed three times with deionized water and absolute ethanol, respectively, and then the sample was ...

Embodiment 2

[0036] In this example, the HSiO prepared in Example 1 2 The / Co@NC composite was used as a negative electrode for Li-ion batteries for Li-ion battery assembly and the performance of battery materials was tested.

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Abstract

The invention relates to a nitrogen-doped carbon-coated hollow hollow silica / cobalt nanocomposite material and a negative electrode material for a lithium ion battery, wherein the nitrogen-doped carbon-coated hollow hollow silica / cobalt nanocomposite The preparation method of the material is as follows: using tetraethyl ethyl 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 hydrothermal conditions, Hollow hollow silica spheres, hollow hollow silica / cobalt composites, and nitrogen-doped carbon-coated hollow hollow silica / cobalt nanocomposites were sequentially prepared. The composite material prepared by the present invention is prepared by step-by-step growth steps, and has excellent cycle stability and rate performance as a negative electrode of a lithium ion battery, and has low manufacturing cost, simple process, low equipment requirements, and environmental protection.

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 silica / cobalt nanocomposite material and a lithium ion battery negative electrode material. Background technique [0002] To meet the growing energy demands of mankind, especially the booming electric vehicle market in recent years, it is crucial to develop new-generation lithium-ion batteries (LIBs) with excellent performance. As an important part of lithium-ion batteries, anode materials affect the electrochemical performance of the entire battery. The specific capacity of traditional LIBs prepared from graphite materials is low (372 mA h g -1 ), it is difficult to meet the increasingly high application requirements of LIBs in applications such as portable electronic devices, electric vehicles, and large-scale energy storage. Therefore, the search for a cheap, high energy density and good cycle performance neg...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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