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Silicon dioxide carbon composite negative electrode material, modified silicon dioxide carbon composite negative electrode material and preparation methods and application of silicon dioxide carbon composite negative electrode material and modified silicon dioxide carbon composite negative electrode material

A technology of silicon dioxide and negative electrode materials, applied in nanotechnology for materials and surface science, battery electrodes, secondary batteries, etc., can solve the problems of volume expansion and harsh synthesis conditions, and achieve the reduction of volume expansion and electrochemical Improved performance and strong controllability of preparation parameters

Active Publication Date: 2016-07-20
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a silicon dioxide carbon composite negative electrode with simple synthesis process, high specific capacity and good electrochemical performance in view of the defects of serious volume expansion and harsh synthesis conditions in the charging and discharging process of existing silicon-based negative electrode materials Material and modified silica-carbon composite negative electrode material and its preparation method and application

Method used

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  • Silicon dioxide carbon composite negative electrode material, modified silicon dioxide carbon composite negative electrode material and preparation methods and application of silicon dioxide carbon composite negative electrode material and modified silicon dioxide carbon composite negative electrode material
  • Silicon dioxide carbon composite negative electrode material, modified silicon dioxide carbon composite negative electrode material and preparation methods and application of silicon dioxide carbon composite negative electrode material and modified silicon dioxide carbon composite negative electrode material
  • Silicon dioxide carbon composite negative electrode material, modified silicon dioxide carbon composite negative electrode material and preparation methods and application of silicon dioxide carbon composite negative electrode material and modified silicon dioxide carbon composite negative electrode material

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preparation example Construction

[0027] The invention provides a method for preparing a silicon dioxide-carbon composite negative electrode material, wherein the method comprises:

[0028] (1) in the presence of a solvent, halloysite is mixed with an organic carbon source, and then the solvent is removed to obtain a solid product;

[0029] (2) Calcining the solid product under an inert atmosphere.

[0030] The present invention adopts relatively common halloysite as a silicon dioxide raw material to combine with carbon in an organic carbon source to produce a composite structure. The preparation method has simple process and common raw materials.

[0031] As long as the above requirements are met, the purpose of the present invention can be achieved, but in order to further improve the electrochemical performance of the obtained silicon dioxide carbon composite negative electrode material, it is preferred that the method also includes: combining the halloysite with the organic carbon source Halloysite is pre...

Embodiment approach

[0033] According to a preferred embodiment of the present invention, the pre-calcination conditions include: the pre-calcination temperature is 300-900°C, the pre-calcination time is 1-5h, preferably the pre-calcination temperature is 550-800°C, and more preferably the pre-calcination is at It is carried out under an air atmosphere, and it is further preferred that the heating rate of the pre-calcination process from normal temperature to the pre-calcination temperature is 2-5° C. / min.

[0034] The normal temperature mentioned in the present invention refers to 10-40°C.

[0035] The halloysite pre-calcination process can remove the crystal water in the halloysite, which is more conducive to improving the discharge specific capacity and cycle stability of the prepared silicon dioxide carbon composite negative electrode material.

[0036] According to a preferred embodiment of the present invention, the product obtained after pre-calcination is mixed and contacted with an acid, ...

Embodiment 1

[0082] This example is used to illustrate the silicon dioxide carbon composite negative electrode material and its preparation method of the present invention.

[0083] (1) After roasting 10g of natural halloysite at 800°C (heating rate: 5°C / min) in an air atmosphere for 2h, place it in 100ml of hydrochloric acid with a concentration of 6mol / L, and place it in a 100°C oil bath Stir at constant temperature for 6 hours, centrifuge, wash with water to pH = 7, and then dry at 100°C for 3 hours. The TEM image of the obtained product is shown in figure 1 shown;

[0084] (2) Add the product obtained in step (1) and sucrose into deionized water in a mass ratio of 1:1 for mixing, and dry at 60° C. for 4 hours;

[0085] (3) Calcining the product obtained in step (2) under an argon atmosphere, the conditions of the calcination include: the calcination temperature is 900°C, the calcination time is 3h, and the heating rate is 5°C / min. After being cooled to room temperature, the silicon d...

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Abstract

The invention relates to the field of preparation of a lithium ion battery, and particularly discloses a preparation method of a silicon dioxide carbon composite negative electrode material. The method comprises the following steps of (1) mixing halloysite with an organic carbon source in the presence of a solvent, and removing the solvent to acquire a solid product; and (2) roasting the solid product in an inertia atmosphere. The invention also provides a carbon nanotube / nitrogen modification method of the silicon dioxide carbon composite negative electrode material. The silicon dioxide carbon composite negative electrode material and the carbon nanotube / nitrogen modified silicon dioxide carbon composite negative electrode material, obtained according to the preparation methods provided by the invention, have relatively high cycle stability and discharge specific capacity, and are expected to be novel negative electrode materials used at a large scale.

Description

technical field [0001] The present invention relates to the field of preparation of lithium ion batteries, in particular to silicon dioxide carbon composite negative electrode material and its preparation method and application, carbon nanotube modified silicon dioxide carbon composite negative electrode material and its preparation method and application and nitrogen modified carbon dioxide Silicon oxide carbon composite negative electrode material and its preparation method and application. Background technique [0002] With the continuous development of society, our demand for energy is increasing, but the abuse of a large amount of fossil energy has caused environmental problems to become increasingly prominent. In this context, clean secondary energy has gradually entered people's field of vision. Among them, lithium-ion batteries have been the focus of the industry since their inception, not only because of their advantages such as high specific energy, high specific ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/48H01M4/62H01M10/0525B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/364H01M4/48H01M4/628H01M10/0525Y02E60/10
Inventor 吴伯荣穆道斌吴川江兵许洪亮王垒刘琦傅佳乐盖亮陈实吴锋
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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