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Silicon monoxide-based carbon negative electrode material, negative electrode plate, preparation method thereof and lithium ion battery

A technology of silicon oxide-based carbon and lithium-ion batteries, which is applied in the direction of negative electrodes, battery electrodes, secondary batteries, etc., can solve the problems of poor coating effect, low first effect of materials, unsatisfactory cycle stability, etc., and achieve cost reduction. Low, improve the first effect, enhance the effect of thermal stability and electrochemical stability

Inactive Publication Date: 2019-08-02
郑州中科新兴产业技术研究院 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the poor coating effect, the first effect of the material is low, and the cycle stability is not ideal

Method used

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  • Silicon monoxide-based carbon negative electrode material, negative electrode plate, preparation method thereof and lithium ion battery
  • Silicon monoxide-based carbon negative electrode material, negative electrode plate, preparation method thereof and lithium ion battery
  • Silicon monoxide-based carbon negative electrode material, negative electrode plate, preparation method thereof and lithium ion battery

Examples

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Effect test

Embodiment 1

[0040] A method for preparing a siloxa-based carbon negative electrode material includes the following steps:

[0041] (1) Silica pretreatment: The silica powder with an average particle size of 5-20μm is calcined at 1000°C for 10 hours under argon protection, and the heating rate is 3°C / min. When the furnace is cooled to room temperature, put the calcined silicon oxide into a ball mill (zirconia is the ball milling medium) for dry ball milling. The ball mill tank is filled with argon gas, the ball-to-battery ratio is 5:1, and the speed of the ball mill is 800 rpm, ball milling time is 10 hours. Then, the ball-milled silicon oxide was dispersed in a 1M sodium hydroxide solution to form a slurry, the solid content was controlled at 7wt%, and the slurry was etched on a magnetic stirrer for 3h. The slurry was washed and vacuumed at 70°C. Dry treatment for 4 hours to obtain pretreated silica;

[0042] (2) Preparation of silicon oxide-based carbon precursor: under the protection of ar...

Embodiment 2

[0048] A method for preparing a siloxa-based carbon negative electrode material includes the following steps:

[0049] (1) Silica pretreatment: The silica powder with an average particle size of 5-20μm is calcined at 800°C for 15 hours under the protection of neon gas at a heating rate of 2°C / min. When the furnace is cooled to room temperature, put the calcined silicon oxide into a ball mill (zirconia is the ball milling medium) for dry ball milling. The ball mill tank is filled with argon gas, the ball to material ratio is 3:1, and the speed of the ball mill is 900rpm, ball milling time is 6 hours. Then disperse the ball-milled silicon oxide in a 0.5M sodium hydroxide solution to make a slurry, with the solid content controlled at 10wt%, and etch it on a magnetic stirrer for 3 hours. The slurry is washed and washed at 100°C. Vacuum drying treatment for 2 hours to obtain pretreated silicon oxide;

[0050] (2) Preparation of silicon oxide-based carbon precursor: under the protecti...

Embodiment 3

[0056] A method for preparing a siloxa-based carbon negative electrode material includes the following steps:

[0057] (1) Silica pretreatment: The silica powder with an average particle size of 5-20μm is calcined at 1200°C for 2 h under helium protection, and the heating rate is 5°C / min. When the furnace is cooled to room temperature, put the calcined silicon oxide into a ball mill (zirconia is the ball milling medium) for dry ball milling. The ball mill tank is filled with helium gas, the ball-to-battery ratio is 10:1, and the speed of the ball mill is 800 rpm, ball milling time is 5 h. Then, the ball-milled silicon oxide was dispersed in a 2M sodium hydroxide solution to make a slurry, the solid content was controlled at 5 wt%, and the slurry was etched on a magnetic stirrer for 1 hour. The slurry was washed and vacuumed at 70°C. Drying for 6 hours to obtain pretreated silicon oxide;

[0058] (2) Preparation of silicon oxide-based carbon precursor: under the protection of argo...

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Abstract

The invention discloses a silicon monoxide-based carbon negative electrode material, a negative electrode plate, a preparation method thereof and a lithium ion battery. Through special treatment of asilicon monoxide raw material (calcination, heat preservation, cooling to room temperature, and ball milling, dispersion of the silicon monoxide after ball milling to a sodium hydroxide solution witha concentration of 0.2M to 2M to prepare slurry, etching for 1h to 5h in a magnetic stirrer, and washing and vacuum drying treatment of the slurry to obtain silicon monoxide after pre-treatment), thecontent of oxygen in the silicon monoxide is changed, first effects of silicon monoxide can be effectively improved, the conductivity is increased, expansion is alleviated, and the purposes of improving the first effects of the material or improving the cycle performance of the material are thus achieved. Through improvement of the preparation process, the negative electrode material capacity execution ability is greatly improved, more graphite can be blended to relieve the strain and suppress the rebound, and at the same time, in combination of measures such as surface coating carbon, the material is higher compatible with the current commercial battery system.

Description

Technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a siloxyl carbon negative electrode material, a negative electrode pole piece, a preparation method thereof, and a lithium ion battery. Background technique [0002] As a new generation of green secondary batteries, lithium-ion batteries have the advantages of high energy density, high rated working voltage, low self-discharge rate, good cycle performance, and high charge and discharge efficiency. They are widely used in portable electronic equipment, electric vehicles and energy storage fields. . However, in recent years, the demand for battery energy density in various fields has rapidly increased, and there is an urgent need to develop higher energy density lithium-ion batteries. Currently, commercial lithium-ion batteries mainly use graphite as the negative electrode material. The theoretical specific capacity of graphite is 372 mAh / g, while the high-end...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/48H01M4/62H01M4/131H01M4/1391H01M10/0525
CPCH01M4/131H01M4/1391H01M4/366H01M4/48H01M4/625H01M4/628H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 刘艳侠张锁江阮晶晶王璞刘凡范亚蒙
Owner 郑州中科新兴产业技术研究院
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