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Preparation method of porous silicon/carbon composite material and application of porous silicon/carbon composite material as negative electrode of lithium ion battery

A carbon composite material, lithium-ion battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of affecting capacity and cycle efficiency, repeated growth of SEI, electrode shedding, etc., achieving easy amplification, simple preparation method, The effect of maintaining stability

Inactive Publication Date: 2021-03-30
绍兴小竹新能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Huge volume changes will cause material pulverization, electrode shedding, SEI repeated growth, etc., affecting capacity and cycle efficiency

Method used

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  • Preparation method of porous silicon/carbon composite material and application of porous silicon/carbon composite material as negative electrode of lithium ion battery
  • Preparation method of porous silicon/carbon composite material and application of porous silicon/carbon composite material as negative electrode of lithium ion battery
  • Preparation method of porous silicon/carbon composite material and application of porous silicon/carbon composite material as negative electrode of lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Step 1) Prepare porous silicon: mix according to the mass ratio of quartz sand:magnesium=1:1. Incubate at 800°C for 12h. After cooling to room temperature, it was washed with hydrochloric acid and filtered to obtain porous silicon.

[0023] Step 2) Preparation of porous silicon / carbon composite material: mixing according to the mass ratio of porous silicon: mesocarbon microspheres = 3:17, and further ball milling. The ball milling tank is a polyurethane tank, the ball milling balls are zirconia balls, and the mass ratio of zirconia balls to (porous silicon + mesocarbon microspheres) is 15:1. The rotating speed of the ball mill is 700rpm, and the ball milling time is 24h. Finally, a porous silicon / carbon composite material is obtained.

[0024] Characterization of porous silicon / carbon composites:

[0025] The morphology of the porous silicon / carbon composite obtained under the above conditions was detected by a Japan Electron Scanning Electron Microscope (JSM-7001F)...

Embodiment 2

[0030] The difference between embodiment 2 and embodiment 1 is:

[0031] Step 1) Mixing according to the mass ratio of quartz sand:Mg:Al=10:5:5. Insulate at 1000°C for 10h.

[0032] Step 2) Mixing according to the mass ratio of porous silicon:artificial graphite=5:5. The mass ratio of grinding balls to powder is 10:1. The rotational speed of the ball mill was 500 rpm.

[0033] The characterization of the porous silicon / carbon composite is the same as in Example 1.

[0034] The positive electrode, negative electrode, electrolyte and battery assembly of the battery are the same as in Example 1, and the battery test results of the obtained porous silicon / carbon composite material are listed in Table 1.

Embodiment 3

[0036] The difference between embodiment 3 and embodiment 1 is:

[0037] Step 1) Mixing according to the mass ratio of diatomaceous earth:Mg:Al=10:5:5. Insulate at 1200°C for 20h.

[0038] Step 2) Mixing according to the mass ratio of porous silicon: porous carbon: artificial graphite=2:3:5. The milling jar is a zirconia jar, and the milling balls are zirconia balls. The mass ratio of grinding balls to powder is 20:1. The ball milling time is 12h.

[0039] The characterization of the porous silicon / carbon composite is the same as in Example 1.

[0040] The positive electrode, negative electrode, electrolyte and battery assembly of the battery are the same as in Example 1, and the battery test results of the obtained porous silicon / carbon composite material are listed in Table 1.

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Abstract

The invention provides a preparation method of a porous silicon / carbon composite material. The preparation method comprises the following steps of 1, converting a silicon dioxide template into poroussilicon by utilizing metallothermic reduction; and 2, carrying out ball milling on the porous silicon and a carbon source to obtain the silicon-carbon composite material. The composite material prepared by the method integrates the advantages of a silicon material and a carbon material, and has excellent cycle performance while maintaining high capacity.

Description

technical field [0001] The invention relates to a preparation method of a porous silicon / carbon composite material and its application as a lithium-ion battery negative electrode Background technique [0002] Lithium-ion batteries have the advantages of high voltage, high specific energy, low weight, low volume, and long life, and are one of the most excellent battery systems. However, the specific capacity of traditional lithium-ion battery graphite anode materials is close to its theoretical value (372m Ah g -1 ), it is difficult to meet the needs of the market. Therefore, it has become an urgent need to develop a new negative electrode material with high energy density, high power density, high safety and low cost. [0003] Compared with graphite materials, silicon materials have extremely high theoretical specific capacity (4200mAh g -1 ), which is more than 10 times that of graphite, and is considered to be the most potential negative electrode material to replace gr...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/583H01M4/62H01M10/0525
CPCH01M4/362H01M4/386H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 钟瓴华徐立辉钟良王熙陈晓清
Owner 绍兴小竹新能源有限公司