High-capacity graphene/ silicone composite negative electrode material and preparation method

A negative electrode material, graphene technology, applied to battery electrodes, electrical components, circuits, etc., can solve the problems of not being able to effectively hinder silicon expansion, not being able to effectively improve silicon conductivity, and poor battery cycle stability. Industrial application, improving cycle performance and battery rate, improving the effect of coating ability

Active Publication Date: 2018-06-08
厦门紫阳科技产业发展有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] In the prior art, the preparation method usually uses traditional mechanical mixing of silicon powder and graphene, and the silicon and graphene are only mixed by simple stirring without any chemical bond connection or electrical attraction, so that the graphene-coated silicon The effect is poor, and finally the conductivity of silicon cannot be effectively improved, and at the same time, the expansion of silicon cannot be effectively prevented, resulting in poor cycle stability and fast decay of the battery.

Method used

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  • High-capacity graphene/ silicone composite negative electrode material and preparation method
  • High-capacity graphene/ silicone composite negative electrode material and preparation method
  • High-capacity graphene/ silicone composite negative electrode material and preparation method

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preparation example Construction

[0045] Such as figure 1As shown, the preparation method of the high-capacity graphene / silicon composite negative electrode material provided by the embodiment of the present invention includes:

[0046] S101: Prepare a graphene oxide solution with a certain concentration by modifying the Hummer method;

[0047] S102: Use ethyl orthosilicate as the silicon source, mix with graphene oxide and magnesium powder in a certain proportion, stir evenly and then ultrasonically disperse;

[0048] S103: removing the solvent from the mixed solution by spray drying, and drying it into a graphene / silicon dioxide composite material powder containing magnesium powder;

[0049] S104: The dried powder is reduced to silicon by magnesia thermal reaction at high temperature in a certain atmosphere, and then washed several times with dilute acid to remove unreacted magnesium powder after high temperature reduction, and then washed with distilled water for several times Second, remove residual acid...

Embodiment example 1

[0070] (1) Prepare a certain 1% graphene oxide ethanol solution by modifying the Hummer method, the graphene oxide sheet diameter is 5-10um, and the thickness is 1-3nm;

[0071] (2) Using ethyl orthosilicate as the silicon source, get 10 g of ethyl orthosilicate, 100 g of graphene oxide ethanol solution, and 20 g of particle diameter of 10 μm magnesium powder are evenly mixed, stirred for 20 minutes, ultrasonic for 30 minutes, and the ultrasonic power is 500 W; ( 3) Remove the mixed solution solvent by spray drying, the spray drying inlet temperature is 120°C, the outlet temperature is 80°C, and dried into graphene / silicon dioxide composite material powder containing magnesium powder;

[0072] (4) Put the dried powder in a nitrogen atmosphere containing 3% hydrogen, reduce silicon dioxide to silicon by magnesia thermal reaction at a high temperature of 600°C, and then wash it with 3% dilute hydrochloric acid for 20 minutes to remove the untreated particles after high temperatur...

Embodiment example 2

[0075] (1) By modifying the Hummer method, prepare 1.5% graphene oxide ethanol: a mixed solvent solution with a volume ratio of deionized water of 9:1, graphene oxide sheet diameter 2-5um, thickness 1-3nm;

[0076] (2) Using ethyl orthosilicate as the silicon source, take 20 g of ethyl orthosilicate, 200 g of graphene oxide ethanol solution, and 40 g of magnesium powder with a particle size of 10 um, mix evenly, stir for 30 minutes, and ultrasonic for 40 minutes, with an ultrasonic power of 400 W;

[0077] (3) The mixed solution solvent is removed by spray drying, the spray drying inlet temperature is 110°C, and the outlet temperature is 80°C, and dried into graphene / silicon dioxide composite material powder containing magnesium powder;

[0078] (4) Put the dried powder in a nitrogen atmosphere containing 4% hydrogen, reduce silicon dioxide to silicon by magnesia thermal reaction at a high temperature of 600°C, and then use a mass fraction of 2% dilute sulfuric acid to wash for...

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Abstract

The invention belongs to the field of preparation of negative electrode materials of lithium ion cells, and discloses a high-capacity graphene/ silicone composite negative electrode material and a preparation method. The method specifically comprises the following steps: preparing certain graphene oxide solution by a modified Hummer method; preparing tetraethoxysilane as a silicone source; uniformly mixing the silicone source with the graphene oxide and magnesium powder based on certain ratio; ultrasonically dispersing; drying the mixed solution into powder through a spraying drying device; reducing under high temperature in certain atmosphere; washing with diluted acid and distilled water in a plurality of times; drying; and grinding powder with certain fineness. According to the method,tetraethoxysilane is used as the silicone source which is high in compatibility; the reaction time is controllable; and moreover, silicone can be effectively wrapped with graphene, so that the electricity conductivity of the silicone can be improved; and meanwhile, the silicone expansion in charging and discharging process can be avoided. Therefore, the circulating performance and the multiplyingpower of the cell with the silicone negative electrode material can be improved.

Description

technical field [0001] The invention belongs to the field of lithium ion battery negative electrode material preparation, and in particular relates to a high-capacity graphene / silicon composite negative electrode material and a preparation method. Background technique [0002] As one of the batteries, rechargeable lithium-ion batteries are widely used in various mobile electronic devices such as mobile phones and notebooks because of their advantages such as high energy density, green environmental protection, low price, high safety performance, and no memory. Computer, remote control, etc. Since 1991, when the commercialized lithium-ion battery was first developed by Sony Corporation, in just over 20 years of development, the development of lithium-ion batteries has shown a rapid growth trend, and the requirements for various indicators and parameters of lithium-ion batteries are also increasing. more harsh. At present, lithium-ion batteries are mainly developing towards ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/62
CPCH01M4/364H01M4/624H01M4/625Y02E60/10
Inventor 陈木成肖宗发
Owner 厦门紫阳科技产业发展有限公司
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