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Nitrogen-doped carbon coating germanium composite lithium battery negative electrode material and preparation method and application thereof

A technology of nitrogen-doped carbon and composite materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of cycle charge-discharge stability, unsatisfactory rate charge-discharge performance safety, etc., to improve the transmission and migration rate , Improve the wettability, and the effect of environmental protection in the preparation process

Inactive Publication Date: 2016-11-30
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the deficiencies in the prior art, provide a nitrogen-doped carbon-coated germanium composite lithium-ion battery negative electrode material and its preparation method, and solve the problem of cycle charge-discharge stability and rate of charge and discharge of germanium-carbon composite materials in the prior art. Technical problems of unsatisfactory charging and discharging performance and safety

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The first step is to measure water:ammonia water=100:1 mass ratio, and mix evenly; then add 0.5g of germanium-containing precursor powder, 25°C, and ultrasonically dissolve for 20min to obtain a sol solution of germanium-containing nanoparticles;

[0037] The massfraction of above-mentioned ammoniacal liquor is 25-28%;

[0038] The germanium-containing precursor is at least one of tetraethyl germanate, germanium dioxide, germanium monoxide, hydroxyethylgermanium sesquioxide, and spirogermanium;

[0039] In the second step, measure water: ethanol: ammonia water = 100:50:30 mass ratio, then take 2 mL of the germanium sol nanoparticle solution prepared in the first step, add it, and disperse with magnetic stirring for 10 min;

[0040] In the third step, slowly add 0.05 g of the nitrogen-containing precursor into the reaction system of the second step, and react with magnetic stirring at 25°C for 24 hours to obtain germanium / nitrogen-containing organic compounds;

[0041] ...

Embodiment 2

[0044] In the first step, measure water:ammonia water=50:1 mass ratio, and mix evenly; then add 1.0 g of germanium-containing precursor powder, 35°C, and ultrasonically dissolve for 30 min to obtain a sol solution of germanium-containing nanoparticles;

[0045] The massfraction of above-mentioned ammoniacal liquor is 25-28%;

[0046] The germanium-containing precursor is at least one of tetraethyl germanate, germanium dioxide, germanium monoxide, hydroxyethylgermanium sesquioxide, and spirogermanium;

[0047] In the second step, measure water: ethanol: ammonia water = 100:25:15 mass ratio, then take 10 mL of the germanium sol nanoparticle solution prepared in the first step, add it, and disperse with magnetic stirring for 20 min;

[0048] In the third step, 2.0 g of the nitrogen-containing precursor was slowly added to the reaction system of the second step, and the reaction was performed under magnetic stirring at 35°C for 12 h to obtain germanium / nitrogen-containing organic ...

Embodiment 3

[0052] The first step is to measure water:ammonia water=3:1 mass ratio, and mix evenly; then add 2.0 g of germanium-containing precursor powder, 50°C, and ultrasonically dissolve for 40 min to obtain a germanium-containing nanoparticle sol solution;

[0053] The massfraction of above-mentioned ammoniacal liquor is 25-28%;

[0054] The germanium-containing precursor is at least one of tetraethyl germanate, germanium dioxide, germanium monoxide, hydroxyethylgermanium sesquioxide, and spirogermanium;

[0055]In the second step, measure water: ethanol: ammonia water=100:1:1 mass ratio, then take 20 mL of the germanium sol nanoparticle solution prepared in the first step and add, magnetically stir and disperse for 40 min;

[0056] In the third step, 5.0 g of the nitrogen-containing precursor was slowly added to the reaction system of the second step, and the reaction was carried out under magnetic stirring at 50°C for 5 hours to obtain germanium / nitrogen-containing organic matter; ...

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Abstract

The invention belongs to the field of lithium battery technologies, and in particular relates to a nitrogen-doped carbon coating germanium composite lithium battery negative electrode material, and a preparation method and an application thereof. The preparation method of the invention comprises the steps of preparing a germanium nano particle solution; polymerizing germanium nano particles with a nitrogenous organic matter precursor, thus obtaining a germanium / nitrogenous organic polymer; and carbonizing the germanium / nitrogenous organic polymer under protection of inert gas, and thus obtaining a nitrogen-doped carbon coating germanium composite material. The nitrogen-doped carbon coating germanium composite material can be used as the negative electrode active material of a lithium battery for preparing a negative electrode of the lithium battery, and is stable in structure, high in charge-discharge specific capacity, stable in high-magnification circulating charge and discharge, simple in production technology and free of pollution on environment.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a nitrogen-doped carbon-coated germanium composite lithium battery negative electrode material and a preparation method and application thereof. Background technique [0002] With the extensive development and rapid application of electric vehicles, higher requirements are put forward for lithium-ion batteries with high specific capacity, high rate charge and discharge, long cycle life and high safety and stability. As one of the key materials of lithium-ion batteries, anode materials play a vital role in improving the charge-discharge capacity of lithium-ion batteries. The current commercial lithium-ion battery negative electrode still mainly uses graphite-like carbon materials. However, the theoretical lithium storage capacity of graphite is only 372mAh / g, which is difficult to meet the requirements of high specific capacity and fast charging and disch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/583H01M4/62H01M4/38H01M10/0525
CPCH01M4/36H01M4/38H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 马晓梅陈敏
Owner FUDAN UNIV
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