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High-compaction density silicon-carbon negative electrode material and preparation method and application thereof

A negative electrode material and compaction density technology, applied in the field of high compacted density silicon carbon negative electrode materials, can solve the problems of poor cycle stability and low efficiency, and achieve the effects of low cost, high degree of practicality, and simple preparation method

Active Publication Date: 2016-09-07
JIANGXI IAMETAL NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a silicon-carbon anode material with high compaction density, which overcomes the defects of poor cycle stability and low efficiency of current silicon-carbon materials under high compaction density

Method used

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  • High-compaction density silicon-carbon negative electrode material and preparation method and application thereof
  • High-compaction density silicon-carbon negative electrode material and preparation method and application thereof
  • High-compaction density silicon-carbon negative electrode material and preparation method and application thereof

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Embodiment 1

[0029]The silicon powder with an average particle size of 1 μm, chitosan, and phenolic resin are wet ball-milled in an aqueous solution, the mass ratio of silicon powder, chitosan, and phenolic resin is 1:1:1, and the speed of the ball mill is 900r / min , after grinding for 3 hours, adjust the speed of the ball mill to 500r / min, and add three kinds of graphite flakes with different particle sizes but the same quality, wherein the average particle size of the graphite flakes is 1 μm, 5 μm, and 10 μm, and the silicon powder and the total The mass ratio of flake graphite was 1:6, and a uniformly mixed slurry was obtained after ball milling for 1 hour. The obtained slurry is shaped by an open spray dryer. The atomizer of the spray dryer is a two-fluid atomizer, the gas used is air, the inlet temperature is 200°C, the outlet temperature is 100°C, and the airflow It is 8L / min, and the feed rate is 30r / min. The obtained material was sintered at 700° C. for 2 h in an argon atmosphere,...

Embodiment 2

[0034] The silica powder with an average particle size of 1 μm, sucrose, and asphalt were wet-milled in an aqueous solution. The mass ratio of silicon powder, sucrose, and asphalt was 1:1:1, and the speed of the ball mill was 900r / min. After grinding for 3 hours, the Adjust the speed of the ball mill to 500r / min, and add three types of graphite flakes with different particle sizes but the same quality, wherein the average particle size of the graphite flakes is 1 μm, 5 μm, and 10 μm, and the mass ratio of silicon powder to the total graphite flakes is 1 :7, after ball milling for 1h, a homogeneous slurry was obtained. The obtained slurry is shaped by an open spray dryer. The atomizer of the spray dryer is a two-fluid atomizer, the gas used is air, the inlet temperature is 200°C, the outlet temperature is 100°C, and the airflow It is 8L / min, and the feed rate is 30r / min. The obtained material was sintered at 700° C. for 2 h in an argon atmosphere, and the heating rate was 7° C...

Embodiment 3

[0037] Silicon powder with an average particle size of 1 μm, glucose, and polyvinylpyrrolidone additives are wet ball-milled in an aqueous solution. The mass ratio of silicon powder to glucose and polyvinylpyrrolidone is 1:1:1, and the speed of the ball mill is 900r / min. After grinding for 3 hours, adjust the rotational speed of the ball mill to 500r / min, and add three types of graphite flakes with different particle sizes but the same quality, wherein the average particle size of the graphite flakes is 1 μm, 5 μm, and 10 μm, and the silicon powder and the total flakes The mass ratio of graphite was 1:10, and a uniformly mixed slurry was obtained after ball milling for 1 hour. The obtained slurry is shaped by an open spray dryer. The atomizer of the spray dryer is a two-fluid atomizer, the gas used is air, the inlet temperature is 200°C, the outlet temperature is 100°C, and the airflow It is 8L / min, and the feed rate is 30r / min. The obtained material was sintered at 700° C. f...

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Abstract

The invention provides a high-compaction density silicon-carbon negative electrode material and a preparation method and an application thereof. The silicon-carbon negative electrode material is formed by mixing silicon powder, graphite and an additive at a certain ratio; and the final product is obtained by burning, coating and re-burning the silicon-carbon negative electrode material, wherein the silicon-carbon composite material is of a porous spherical structure; silicon is evenly dispersed into porous silicon carbon balls in a form of nanometer silicon; the particle sizes of the silicon are smaller than 200nm; and a uniform coating layer is formed on the surface of the silicon. The high-compaction density silicon-carbon negative electrode material is high in efficiency, high in capacity and good in cycling stability when applied to a lithium-ion battery, low in cost and suitable for large-scale production and the preparation method is simple.

Description

technical field [0001] The invention relates to a high compacted density silicon-carbon negative electrode material, a preparation method thereof and an application as a lithium ion battery negative electrode material. Background technique: [0002] Lithium-ion batteries have been widely used in portable electronic devices and electric vehicles because of their outstanding advantages such as no pollution, long service life, small size, and fast charging and discharging. In recent years, with the increasing requirement for battery energy density, the current battery material system has gradually failed to meet the high energy density requirement. As far as negative electrode materials are concerned, graphite negative electrode materials have been widely used in commercial lithium-ion batteries, but the theoretical capacity of graphite negative electrode materials is only 372mAh / g, which cannot meet the requirements of small, light, long-term driving of lithium-ion batteries. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525
CPCH01M4/366H01M4/386H01M4/625H01M10/0525Y02E60/10
Inventor 郭玉国徐泉孔一鸣李金熠殷雅侠
Owner JIANGXI IAMETAL NEW ENERGY TECH CO LTD
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