Preparation method of aluminum oxide modified graphene lithium ion battery negative electrode material

A technology for lithium ion batteries and negative electrode materials, which is applied in battery electrodes, negative electrodes, secondary batteries, etc., can solve the problems of low cycle stability and low power storage.

Active Publication Date: 2020-09-25
山东信开源科技创新发展有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This invention does not require additives such as metal current collectors, binders, and conductive carbon, which is conducive to improving the energy density and power density of the electrode, but there are problems such as low cycle stability and low power storage.

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  • Preparation method of aluminum oxide modified graphene lithium ion battery negative electrode material

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[0025] The preparation method of the graphene lithium ion battery negative electrode material of described aluminum oxide modification, comprises the following steps:

[0026] S1: Mix nano-silicon powder and graphene and perform ultrasonic treatment, then add carbon fiber and acid-treated carbon nanotubes and stir evenly to obtain graphene containing silicon / carbon; during the ultrasonic treatment, the frequency of the ultrasonic wave is 25 -30KHz, the treatment time is 30-40min; the acid-treated carbon nanotubes are added to the concentration of 20%-30% hydrochloric acid and mixed uniformly, and dried under the condition of 40-60°C. The mass ratio of hydrochloric acid to carbon nanotubes is (1-2): (4-6);

[0027] S2: Mix ethylene carbonate with composite graphene containing silicon / carbon, stir magnetically at room temperature for 10-12h, let it stand for 2-6h, then place it in a high-temperature furnace, rapidly raise the temperature to 800-1000°C, and heat it under argon U...

Embodiment 1

[0031] A graphene lithium-ion battery negative electrode material modified by alumina, comprising the following raw materials in parts by weight: 20 parts of nano-silicon powder, 60 parts of carbon fiber, 20 parts of graphene, 18 parts of carbon nanotubes, and 3 parts of ethylene carbonate , 12 parts of aluminum oxide, and 1 part of polyacrylic acid.

[0032] Preferably, the particle size of the nano silicon powder is 15nm.

[0033] The preparation method of the graphene lithium ion battery negative electrode material of described aluminum oxide modification, comprises the following steps:

[0034] S1: Mix nano-silicon powder and graphene and perform ultrasonic treatment, then add carbon fiber and acid-treated carbon nanotubes and stir evenly to obtain graphene containing silicon / carbon; during the ultrasonic treatment, the frequency of the ultrasonic wave is 25KHz , the treatment time is 40min; the acid-treated carbon nanotubes are that the carbon nanotubes are added to a conc...

Embodiment 2

[0039] A graphene lithium-ion battery negative electrode material modified by alumina, in parts by weight, comprising the following raw materials: 15 parts of nano silicon powder, 50 parts of carbon fiber, 30 parts of graphene, 15 parts of carbon nanotube, 7 parts of ethylene carbonate , 15 parts of aluminum oxide, 3 parts of polyacrylic acid.

[0040] Preferably, the particle size of the nano silicon powder is 10nm.

[0041] The preparation method of the graphene lithium ion battery negative electrode material of described aluminum oxide modification, comprises the following steps:

[0042] S1: Mix nano-silicon powder and graphene and perform ultrasonic treatment, then add carbon fiber and acid-treated carbon nanotubes and stir evenly to obtain graphene containing silicon / carbon; during the ultrasonic treatment, the frequency of the ultrasonic wave is 30KHz , the treatment time is 35min; the acid-treated carbon nanotubes are that the carbon nanotubes are added to a concentra...

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Abstract

The invention discloses an alumina-modified graphene lithium ion battery anode material and a preparation method thereof, which belong to the technical field of lithium ion battery anode materials. The alumina-modified graphene lithium ion battery anode material consists of the following raw materials: nano-silicon powder, carbon fibers, graphene, carbon nanotubes, ethylene carbonate, alumina andpolyacrylic acid; and the lithium ion battery anode material is prepared by steps such as ultrasonic treatment, magnetic stirring, microwave treatment and high-temperature calcination. According to the invention, by means of a reinforcing system composed of ethylene carbonate, alumina and polyacrylic acid, the lithium intercalation capacity, lithium deintercalation capacity, initial coulombic efficiency and cycle performance of the alumina-modified graphene lithium ion battery anode material are increased.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery negative electrode materials, and in particular relates to a preparation method of alumina-modified graphene lithium-ion battery negative electrode materials. Background technique [0002] Graphene-based composite materials are composite materials formed by combining graphene with other functional materials to make full use of the characteristics of graphene to exert the specific properties of functional materials. Graphene composites were first reported by Ruoff et al. in 2006. Subsequently, the preparation of graphene-based composite materials has become a new research hotspot, and various graphene-based composite materials have been prepared in recent years. Among them, in terms of lithium storage materials, graphene-based composite materials can give full play to the advantages of large specific surface area of ​​graphene, good electrical and thermal conductivity, etc., so that th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/587H01M4/62H01M10/0525
CPCH01M4/364H01M4/587H01M4/628H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 不公告发明人
Owner 山东信开源科技创新发展有限责任公司
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