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Silicon-carbon negative electrode material and preparation method thereof

A negative electrode material, silicon-carbon technology, applied in the field of silicon-carbon negative electrode materials and their preparation, can solve the problems of uneven dispersion of finished composite materials, complicated preparation methods, and high production costs, and achieve short preparation process time, simple preparation methods, and reduced The effect of preparation costs

Pending Publication Date: 2020-12-04
南京同宁新材料研究院有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the above problems, the present invention proposes a new method for preparing a silicon-carbon composite negative electrode material, and the silicon-carbon composite negative electrode material produced by this method, which can improve the complexity of the existing silicon-carbon composite negative electrode material. Shortcomings such as long time and high production cost can improve the problem of uneven dispersion of finished composite materials

Method used

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  • Silicon-carbon negative electrode material and preparation method thereof
  • Silicon-carbon negative electrode material and preparation method thereof
  • Silicon-carbon negative electrode material and preparation method thereof

Examples

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preparation example Construction

[0037] The existing preparation methods mainly include thermal decomposition method, gas phase precipitation method, ball milling method, sol-gel method, etc. Taking the ball milling method as an example, it is necessary to carry out blending ball milling of nano-scale silicon element or silicon oxide and graphite, and high-speed ball milling for 12 hours As above, carbon coating is carried out on the silicon-carbon composite material after ball milling by means of a spray drying method or the like. However, the existing preparation methods all have problems such as complex preparation methods, long preparation time, and high preparation costs, making it difficult to realize industrial production.

[0038] Moreover, in the finished product prepared by the existing preparation method, due to the uneven dispersion of the graphite negative electrode and the silicon-containing oxide in the mixture, the material consistency is poor, resulting in a large volume expansion of the silic...

Embodiment 1

[0068] Select a graphite negative electrode material with a particle size of about 100nm, evenly attach it to the carrier, and send it into the reaction chamber of the tube furnace. Intake line 1, feed nitrogen gas for 3 minutes, remove the air in the chamber, and set the temperature to 120 degrees Celsius. Keep warm for 1 hour, set the temperature to 1200 degrees Celsius, when the temperature rises to 1000 degrees, open the air inlet line 2, close the gas line 1, and feed argon, when the temperature rises to 1200 degrees, open the gas line 4, and let the argon flow in The silicon source (silicon tetrachloride) carried by the hydrogen gas, the gas flow meter sets the flow rate to 20ul / min, close the gas circuit 2, and keep the reaction at 1200 degrees for 300 minutes. After the reaction, open the gas circuit 2, pass in argon, and close Gas path four, feed silicon source inert gas and hydrogen gas, use pure water as the exhaust gas collection device, wait for the temperature to ...

Embodiment 2

[0074] Other experimental steps are the same as in Example 1, and the reaction temperature is set at 1220 degrees.

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Abstract

The invention provides a silicon-carbon negative electrode material and a preparation method thereof, belonging to the technical field of material preparation. The method specifically comprises the following steps: step 1, putting a nanoscale graphite substrate into a chamber of a settling device, and conducting sufficient heating to remove moisture under the protection of nitrogen gas; step 2, introducing a gas mixture of inert gas containing a silicon source and hydrogen at a high temperature, and uniformly settling nanoscale elemental silicon generated by a reaction in the graphite base mentioned in the step 1 under high-temperature catalysis; and step 3, introducing a gas carbon source into a silicon-carbon composite negative electrode material prepared in the step 2 under the protection of inert gas, and performing sintering treatment with a temperature controlled to be 400-600 DEG C, thereby finally obtaining the carbon-coated silicon-carbon negative electrode material. The novelpreparation method provided by the invention is simple, and the whole preparation process is completed in one step; and a prepared sample does not need to be transferred and prepared multiple times,and the whole preparation process is short in time and can be completed within 24 hours.

Description

technical field [0001] The invention belongs to the technical field of material preparation, and in particular relates to a silicon-carbon negative electrode material and a preparation method thereof. Background technique [0002] Due to its low lithium intercalation potential, theoretical specific energy of up to 4200mAh / g, environmental friendliness, and low price, silicon anode materials have attracted much attention and are considered to be one of the best choices for the anode materials of next-generation high-capacity lithium-ion batteries. . [0003] However, silicon anodes have disadvantages such as poor electrical conductivity, huge volume expansion, easy pulverization of materials, and poor charge-discharge cycle performance, which limit the direct application of silicon anode materials. Therefore, researchers want to combine silicon-based negative electrode materials and graphite negative electrode materials, combining the electrochemical stability of graphite ne...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/21C01B32/05C01B33/03H01M4/38H01M4/62H01M10/0525
CPCC01B33/03C01B32/05C01B32/21H01M4/386H01M4/625H01M10/0525Y02E60/10
Inventor 王俊祥孟佼沈左松王志银严超刘建波
Owner 南京同宁新材料研究院有限公司
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