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Preparation method and application of silicon/nitrogen-doped graphene composite material for lithium ion battery

A nitrogen-doped graphene, lithium-ion battery technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of high preparation cost, complex process, difficult industrialization, etc., achieves low equipment requirements, simple synthesis route, High uniformity effect

Inactive Publication Date: 2018-07-31
CHINA UNIV OF MINING & TECH
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Problems solved by technology

[0006] The purpose of the present invention is to provide a preparation method and application of a silicon / nitrogen-doped graphene negative electrode material for lithium-ion batteries with a simple synthesis route and easy regulation, so as to solve the complex process of synthesizing silicon / nitrogen-doped graphene composite electrode materials in the prior art, The problem of high preparation cost and difficulty in industrialization

Method used

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  • Preparation method and application of silicon/nitrogen-doped graphene composite material for lithium ion battery
  • Preparation method and application of silicon/nitrogen-doped graphene composite material for lithium ion battery
  • Preparation method and application of silicon/nitrogen-doped graphene composite material for lithium ion battery

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preparation example Construction

[0030] A method for preparing a silicon / nitrogen-doped graphene composite material, comprising the following steps:

[0031] (1) Weigh the nitrogen source: carbon source: silicon powder according to the mass ratio of 10: 1: (1-x), where 0≦x≦0.9; transfer the mixed powder to a ball mill jar, add absolute ethanol to The powder is in the form of a paste, and then ball-milled in a planetary ball mill for 1-10 hours, and the ball-milled mixture is dried at 60°C for 3-24 hours to obtain a precursor mixture;

[0032] (2) Transfer the mixed material obtained in step (1) to a vacuum tube furnace protected by an inert gas atmosphere, raise the temperature to 520-600°C at a heating rate of 1-15°C / min, and continue to heat at the same rate after 1-10 hours of heat preservation. Raise the temperature to 750-900°C, keep it warm for 1-10 hours, and then naturally cool to room temperature with the furnace to obtain a silicon / nitrogen-doped graphene composite material.

[0033] The nitrogen s...

Embodiment 1

[0043] Example 1: Preparation method and characterization of silicon / nitrogen-doped graphene composite negative electrode material for lithium ion battery.

[0044] 1) The nitrogen source is a nitrogen-containing heterocyclic organic compound selected from melamine (C 3 N 3 (NH 2 ) 3 ) or dicyandiamide (C 2 h 4 N 4 ); Carbon source selects anhydrous glucose for use;

[0045] Weigh 3g melamine (C 3 N 3 (NH 2 ) 3 ), 0.3g of anhydrous glucose, 0.03g of 500nm silicon powder, transferred to a stainless steel ball mill jar, added 30ml of absolute ethanol to make the mixed powder into a paste, and after ball milling in a planetary ball mill for 6 hours, the mixture was transferred to a vacuum drying oven Dry at 60°C for 12 hours, then transfer the solid mixture to an OTF-1200X vacuum tube furnace, use argon as a protective gas to raise the temperature to 580°C at a rate of 2.5°C / min, and keep it for 4 hours with the same temperature rise Raise the temperature to 800°C, kee...

Embodiment 2

[0050] Embodiment 2: weigh 3g dicyandiamide (C 2 h 4 N 4 ), 0.3g anhydrous glucose, 0.03g 200nm silicon powder, transfer in the stainless steel ball mill tank, add 30ml absolute ethanol to make the mixed powder into a paste, after ball milling in the planetary ball mill for 6 hours, the mixture is transferred to vacuum drying Dry it in the oven at 60°C for 12 hours, then transfer the solid mixture to an OTF-1200X vacuum tube furnace, use argon as a protective gas to raise the temperature to 580°C at a rate of 2.5°C / min, and keep it for 4 hours. The heating rate is increased to 800°C, and after two hours of heat preservation, the furnace is cooled to room temperature, and the silicon / nitrogen-doped graphene composite material is obtained. Silicon exists in the graphene sheet in the form of simple silicon (JCPDS No. 27-1402), and the particle size is 100nm-300nm.

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Abstract

Preparation method and application of a silicon / nitrogen-doped graphene composite material for a lithium ion battery belongs to preparation method and application of a silicon / nitrogen-doped graphenecomposite material. According to the preparation method of the silicon / nitrogen-doped graphene composite material, commercial silicon powder, a carbon source and a nitrogen source are mixed and subjected to wet ball-milling, a high-temperature solid-phase sintering synthesis technology is employed under an inert atmosphere after drying, a technical parameter during the reaction process is controlled, silicon content control of the silicon / nitrogen-doped graphene composite material is achieved, and the silicon / nitrogen-doped graphene composite material is obtained and is used for fabricating alithium ion battery negative electrode. The preparation method has the advantages that the material shows excellent cycle and rate performance when used as a lithium ion battery negative electrode, issimple and reliable in production process, available in raw material, low in equipment requirement, simple in synthesis circuit and high in operation step controllability and is convenient to control, large-scale quantitative preparation is easily achieved, and the integral electrochemical performance is greatly improved by the composite material.

Description

technical field [0001] The invention relates to a preparation method and application of a silicon / nitrogen-doped graphene composite material, in particular to a preparation method and application of a silicon / nitrogen-doped graphene composite material for lithium ion batteries. Background technique [0002] Under the social background of huge consumption of non-renewable fossil energy and increasingly prominent environmental problems, the alternative renewable green energy has received great attention. Among them, lithium-ion batteries have high voltage, low self-discharge rate, small size and weight. Excellent properties such as light weight and no memory effect are widely used in portable electrical appliances and electric vehicles. As a negative electrode material that has been commercialized at this stage, graphite materials have greatly limited the improvement of the overall capacity of lithium-ion batteries due to their low theoretical capacity (372mAh / g). Therefore, m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/583H01M4/133
CPCH01M4/133H01M4/362H01M4/583Y02E60/10
Inventor 邢政邓怡晨强颖怀鞠治成
Owner CHINA UNIV OF MINING & TECH
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