Silicon dioxide-carbon composite material as well as preparation method and application thereof

A technology of carbon composite materials and silicon dioxide, applied in the direction of secondary batteries, electrochemical generators, active material electrodes, etc., can solve the problems of difficult to effectively control the specific capacity of the negative electrode of the battery, complicated process, and inability to effectively control the relative content, etc. , to achieve good cycle stability, high cycle stability, simple and easy preparation method

Active Publication Date: 2021-07-27
陈庆
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The embodiment of the present invention aims to solve the problem that the existing technology cannot effectively control the relative content of silicon dioxide and carbon in the product, and it is difficult to effectively control the specific capacity and process of the negative electrode of the battery complicated question

Method used

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  • Silicon dioxide-carbon composite material as well as preparation method and application thereof
  • Silicon dioxide-carbon composite material as well as preparation method and application thereof
  • Silicon dioxide-carbon composite material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] (1) Add citric acid with a purity of 99.55% into deionized water according to a mass concentration of 3 wt%, stir evenly, and heat to 30°C for use;

[0044] (2) Add the rice husk (the rice husk has been pre-screened to remove large particles of impurities) into the container according to the solid-liquid mass ratio (1:10), stir evenly, soak for 20 minutes, and set aside;

[0045] (3) Stir the soaked rice husks with a spiral stirring and cleaning device (for example, a spiral mixer) at a controlled stirring speed of 200r / min for 30 minutes, then drain the water and set aside. (i.e. pickling pretreatment)

[0046] (4) Add the cleaned rice husks to deionized water at 30°C according to the solid-to-liquid mass ratio (1:10), soak for 30 minutes, stir for 30 minutes at a speed of 300r / min, remove residual impurities from raw materials, and filter to dry Moisturize before use.

[0047] (5) Dry and pulverize the rice husk.

[0048] (6) Load the rice husk into the rice husk a...

Embodiment 2

[0053] (1) Add citric acid with a purity of 99.55% into deionized water according to the mass concentration of 4wt%, stir evenly, and heat to 40°C for use;

[0054] (2) Add rice husks into the container according to the solid-to-liquid mass ratio (1:10), stir evenly, soak for 30 minutes, and set aside;

[0055] (3) Use a spiral mixer with the soaked rice husk at a speed of 250r / min for 40 minutes, drain the water and set aside.

[0056] (4) Add the cleaned rice husks to deionized water at 30°C according to the solid-to-liquid mass ratio (1:10), soak for 30 minutes, stir for 30 minutes at a speed of 300r / min, remove residual impurities from raw materials, and filter to dry Moisturize before use.

[0057] (5) Dry and pulverize the rice husk.

[0058] (6) Load the rice husk into the rice husk according to the volume of the furnace body (1:3).

[0059] (7) Calcination; the calcination conditions are: calcination temperature 900°C, heat preservation for 3 hours; the heating rate...

Embodiment 3

[0062] (1) Add citric acid with a purity of 99.55% into deionized water according to a mass concentration of 5 wt%, stir evenly, and heat to 40°C for use;

[0063] (2) Add rice husks into the container according to the solid-to-liquid mass ratio (1:10), stir evenly, soak for 45 minutes, and set aside;

[0064] (3) Use a spiral mixer with the soaked rice husk at a speed of 300r / min for 50 minutes, drain the water and set aside.

[0065] (4) Add the cleaned rice husks to deionized water at 30°C according to the solid-to-liquid mass ratio (1:10), soak for 30 minutes, stir for 30 minutes at a speed of 300r / min, remove residual impurities from raw materials, and filter to dry Moisturize before use.

[0066] (5) Dry and pulverize the rice husk.

[0067] (6) Load the rice husk into the rice husk according to the volume of the furnace body (1:3).

[0068] (7) The calcination conditions are as follows: a calcination temperature of 900° C. and a heat preservation time of 3 hours; the...

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Abstract

The invention discloses a silicon dioxide-carbon composite material as well as a preparation method and application thereof, and relates to the technical field of lithium ion batteries. The preparation method comprises the following steps of S1, carrying out acid pickling pretreatment on the rice husks through an acid solution; S2, drying and crushing the rice husks; S3, calcining rice husks under the protection of inert gas to prepare a silicon dioxide-carbon composite material, wherein in the step S1, the concentration of the acid solution is 3-9wt%; and the temperature of the acid solution is 30-70 DEG C. According to the present invention, a stable ratio of silicon dioxide to organic matters is obtained by controlling the concentration of a citric acid solution, the solution temperature, the stirring speed and the stirring time through an acid pickling pretreatment process, and the silicon dioxide-carbon composite material with the proper ratio is obtained after carbonization treatment; the preparation method is simple and easy to implement, is low in cost and is free of pollution; the prepared silicon dioxide-carbon composite material is used as a negative electrode material of a lithium ion battery, and has the advantages of large specific capacity, high cycling stability, long cycle life and the like.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a silicon dioxide-carbon composite material and a preparation method and application thereof. Background technique [0002] With the rapid development of science and technology, various electronic devices and electric vehicles have been widely used, and the requirements for chemical power sources are also getting higher and higher. Lithium-ion batteries have been widely used in electronic devices due to their advantages such as small size, high specific capacity, environmental protection, and multiple charge and discharge. At present, the negative electrode material of commercialized lithium-ion batteries is mostly graphite, but the low theoretical specific capacity (372mAh / g) of graphite limits the further development of high-capacity lithium-ion batteries. Studies have found that the reversible lithium storage capacity of silicon-based and other alloy materials i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485H01M4/62H01M10/0525
CPCH01M4/485H01M4/625H01M10/0525H01M2004/027Y02E60/10
Inventor 陈庆
Owner 陈庆
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