Composite negative electrode material, preparation method and lithium battery

A technology for negative electrode materials and raw materials, which is applied in the field of composite negative electrode materials and their preparation, can solve the problems of low conductivity and poor rate performance of silicon-based materials, and achieve high specific capacity, improve rate performance, and inhibit the effects of cracking and pulverization.

Inactive Publication Date: 2017-02-22
ZHUHAI COSMX BATTERY CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, the conductivity of silicon-based materials is lower than that of graphite, resulting in poor rate performance of silicon-based materials.

Method used

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  • Composite negative electrode material, preparation method and lithium battery
  • Composite negative electrode material, preparation method and lithium battery

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preparation example Construction

[0024] The preparation method of the composite negative electrode material of the present invention is as follows: the nitrogen precursor, the carbon precursor and the copper salt are dissolved in a solvent to form a mixed solution, and the solvent is at least one of water or ethanol; in the mixed solution, the mass of the nitrogen precursor The percentage concentration is 0.1% to 20%, the mass percentage concentration of the carbon precursor is 0.1% to 20%, and the mass percentage concentration of the copper salt is 0.1% to 20%. The ratio of graphite and silicon-based raw materials is 50: Mix at a ratio of 50 to 99:1, then add to the prepared mixed solution, stir evenly to obtain a slurry mixture, then react the slurry mixture in a high-pressure reactor at 100°C to 300°C for 1 to 24 hours, and then cool , filtering and drying to obtain a solid mixture, and calcining the solid mixture at 500-1000° C. for 1-12 hours in a high-temperature furnace under the protection of an inert ...

Embodiment 1

[0032] Dissolving melamine, glucose and copper nitrate in water to form a mixed solution, the mixed solution has a concentration of 0.1% by mass of melamine, 5% by mass of glucose, and 1% by mass of copper nitrate;

[0033] After mixing the graphite and silicon powder in a mass fraction ratio of 99:1, immerse in the prepared mixed solution, and stir evenly to obtain a slurry-like mixture;

[0034] The prepared slurry mixture was reacted at 100°C for 24 hours in a high-pressure reactor, then cooled, filtered to remove the solvent and dried to obtain a solid mixture;

[0035] The solid mixture was calcined at 500° C. for 12 hours in a high-temperature furnace under the protection of nitrogen to obtain a composite negative electrode material.

[0036] The composite negative electrode material is used to make a negative electrode sheet by conventional technology, and is matched with a conventional positive electrode sheet, a conventional separator, and a conventional electrolyte t...

Embodiment 2

[0038] Ammonia, starch and copper chloride are dissolved in water to form a mixed solution, the mass percentage concentration of ammonia in the mixed solution is 20%, the mass percentage concentration of starch is 20%, and the mass percentage concentration of copper chloride is 0.1%;

[0039] After mixing graphite and silicon oxide powder at a mass ratio of 50:50, immerse in the mixed solution, and stir evenly to obtain a slurry-like mixture;

[0040] The slurry mixture was reacted at 150°C for 1 h in an autoclave, cooled, filtered to remove the solvent and dried to obtain a solid mixture;

[0041] The solid mixture was calcined in a high-temperature furnace at 700° C. for 3 hours under the protection of nitrogen to obtain a composite negative electrode material.

[0042] The composite negative electrode material is used to make a negative electrode sheet by conventional technology, and is matched with a conventional positive electrode sheet, a conventional separator, and a co...

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Abstract

The invention discloses a preparation method of a composite negative electrode material. The method comprises the following steps of dissolving a nitrogen precursor, a carbon precursor and a copper salt into a solvent to form a mixed solution; mixing graphite with a silicon-based raw material, adding the mixture to the prepared mixed solution and stirring evenly to obtain a slurry-like mixture; reacting the slurry-like mixture by using a high-pressure reaction kettle at 100-300 DEG C for 1-24 hours and then carrying out cooling, filtering and drying to obtain a solid mixture; and burning the solid mixture by using a high-temperature furnace under inert gas protection at 500-1,000 DEG C for 1-12 hours to obtain the composite negative electrode material. According to the negative electrode material prepared by the method, the initial discharge efficiency of the material can be improved and the cycle life of the material can be prolonged under the condition of ensuring high specific capacity; and the rate capability of the material is improved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a composite negative electrode material and a preparation method thereof, and a lithium ion battery prepared by using the composite negative electrode material. Background technique [0002] Lithium-ion batteries have the characteristics of high energy density, long cycle life, and environmental friendliness. They have been widely used in electronic products such as mobile communication equipment, notebook computers, and digital cameras, and are gradually playing a role in the fields of electric vehicles and energy storage. The negative electrode material is one of the key materials of lithium-ion batteries, which directly affects the performance of lithium-ion batteries. [0003] At present, the most widely used commercial lithium-ion battery anode material is graphite, and its theoretical specific capacity is 372mAh / g. As the market's requirements for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525
CPCH01M4/366H01M4/386H01M4/62H01M4/626H01M4/628H01M10/0525H01M2004/027Y02E60/10
Inventor 李俊义赵伟徐延铭李素丽
Owner ZHUHAI COSMX BATTERY CO LTD
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