Pitch-based porous carbon material and preparation method thereof, silicon-carbon negative electrode material and secondary battery

A porous carbon material and pitch-based technology, applied in the direction of secondary batteries, battery electrodes, circuits, etc., can solve the problems of low production efficiency, complicated process steps, high production cost, etc., achieve high production efficiency, simple process steps, and reduce production The effect of energy consumption

Inactive Publication Date: 2018-12-21
桑德新能源技术开发有限公司 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The first object of the present invention is to provide a preparation method of pitch-based porous carbon material, so as to alleviate the technical problems of complex process steps, high production cost and low production efficiency when using pitch as raw material to produce porous carbon in the prior art

Method used

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  • Pitch-based porous carbon material and preparation method thereof, silicon-carbon negative electrode material and secondary battery
  • Pitch-based porous carbon material and preparation method thereof, silicon-carbon negative electrode material and secondary battery
  • Pitch-based porous carbon material and preparation method thereof, silicon-carbon negative electrode material and secondary battery

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preparation example Construction

[0027] In one aspect, the present invention provides a method for preparing pitch-based porous carbon material, including the following steps:

[0028] The mixture of pitch and pore former obtained after ball milling is calcined to obtain the pitch-based porous carbon material.

[0029] The method for preparing the pitch-based porous carbon material provided by the present invention uses pitch as the raw material to effectively and fully mix the pitch and the pore former through ball milling to obtain a mixture of the two, and then calcine to obtain the porous carbon material. In the preparation method, the carbonization and pore formation of the pitch are completed through a one-time calcination process, the process steps are simple, and complex instruments and equipment are not required, the preparation time is greatly shortened, the production efficiency is high, the production energy consumption is reduced, and the production age is reduced. this.

[0030] In addition, during th...

Embodiment 1

[0063] This embodiment is a preparation method of pitch-based porous carbon material, including the following steps:

[0064] a) First, fully dry the asphalt at 30°C, and mix the dried asphalt with potassium hydroxide in a mass ratio of 1:3;

[0065] b) Select agate balls of different diameters, among which the diameters of the agate balls are 5mm, 1cm and 1.5cm respectively;

[0066] c) Put the mixed mixture of pitch and potassium hydroxide and the selected agate balls into a ball mill for 2 hours, and collect the ball milled product. After the material is fully dried, put it into a tube furnace and place it in argon. Calcination in an atmosphere; during calcination, set the furnace temperature to 900°C at a heating rate of 5°C / min and keep it for 1 hour to complete the calcination process;

[0067] d) After the furnace is naturally cooled to room temperature, take out the sample to fully grind, and then wash the sample with dilute nitric acid solution, ethanol solution and deionized...

Embodiment 2

[0069] This embodiment is a method for preparing a pitch-based porous carbon material. The difference from Embodiment 1 is that the mass ratio of pitch to potassium hydroxide in this embodiment is 1:1, and the others are the same as Embodiment 1.

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Abstract

The invention provides a pitch-based porous carbon material and a preparation method thereof, a silicon-carbon negative electrode material and a secondary battery, which relate to the technical fieldof carbon material preparation. The preparation method of the pitch-based porous carbon material comprises the following steps of: calcining the mixture of the pitch obtained after ball milling and apore forming agent to obtain the pitch-based porous carbon material. The preparation method can alleviate the technical problems of complex process steps, high production cost and low production efficiency when producing porous carbon by using the pitch as a raw material in the prior art, thereby achieving the technical effects of reducing production cost, improving production efficiency and improving porosity of the porous carbon material.

Description

Technical field [0001] The invention relates to the field of carbon material preparation, in particular to a pitch-based porous carbon material and a preparation method thereof, a silicon carbon negative electrode material and a secondary battery. Background technique [0002] In recent years, as people’s requirements for battery energy density have increased, the current battery material system has gradually failed to meet the high energy density requirements. The study found that silicon is currently the anode material with the largest theoretical capacity, and lithium forms Li in silicon 4.4 When Si, the specific capacity is as high as 4200mAh / g, which is much higher than the theoretical capacity of graphite (theoretical capacity of graphite anode materials is only 372mAh / g), and silicon has the advantages of low lithium insertion potential and low cost, which is expected to replace graphite as Next-generation anode material for lithium-ion batteries. However, silicon as a ne...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/583H01M10/0525
CPCH01M4/362H01M4/386H01M4/583H01M10/0525Y02E60/10
Inventor 石朝辉苗力孝霍晓梅汪志华
Owner 桑德新能源技术开发有限公司
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