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Silicon carbon negative electrode material of lithium ion battery and preparation method of silicon carbon negative electrode material

A technology for lithium-ion batteries and negative electrode materials, which can be used in battery electrodes, secondary batteries, circuits, etc., and can solve the problems of poor composite effect of silicon-carbon negative electrodes

Inactive Publication Date: 2018-01-19
天津爱敏特电池材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide a lithium-ion battery negative electrode material and its preparation method, which solves the problem of poor composite effect of silicon-carbon negative electrodes

Method used

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  • Silicon carbon negative electrode material of lithium ion battery and preparation method of silicon carbon negative electrode material

Examples

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Embodiment 1

[0021] Add 10g of PVA into 1000g of silicon oxide aqueous solution (solid content 15%), stir evenly for 0.5h, then spray dry to obtain surface-coated silicon oxide particles, and then roast them at 1000°C by mechanical crushing Depolymerize to obtain modified silica particles; mix the modified silica with artificial graphite and asphalt according to the ratio of 20:50:30, and then heat it to 400°C at 2°C / min in the reactor, and the stirring speed is 50rpm. Fusion coating is carried out; then the fusion coating material is carbonized in a nitrogen atmosphere at a rate of 2°C / min to 1000°C, and then sieved to obtain a modified silicon-carbon negative electrode material.

Embodiment 2

[0023] Add 5g of phenolic resin to 1000g of silicon alcohol solution (solid content 10%), stir evenly for 0.5h, then perform low-temperature vacuum drying treatment to obtain surface-coated silicon particles, and then roast them at 1100°C in airflow mode Depolymerize to obtain modified silicon particles; mix modified silicon with natural graphite and phenolic resin at a ratio of 10:70:20VC, and then heat to 700°C at 5°C / min in the reactor, stirring at 30rpm, for fusion coating Then, the fused coating material is carbonized in an argon atmosphere at a rate of 1 °C / min to 1100 °C, and then sieved to obtain a modified silicon-carbon negative electrode material.

Embodiment 3

[0025] Add 5g of sucrose to 1000g of silicon oxide aqueous solution (solid content 15%), stir evenly for 0.5h, then perform low-temperature vacuum drying to obtain surface-coated silicon oxide particles, and then roast them at 600°C, using airflow Depolymerization is carried out to obtain modified silicon oxide particles; the modified silicon oxide is mixed with artificial graphite, carbon fiber, and pitch according to 15:55:5::20 ball milling, and then the fusion coating material is mixed in an argon atmosphere with 1 °C / min is raised to 1100 °C for carbonization treatment, followed by sieving treatment to obtain the modified silicon carbon negative electrode material.

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Abstract

The invention discloses a silicon carbon negative electrode material of a lithium ion battery and a preparation method of the silicon carbon negative electrode material, and mainly aims to improve thecomposite effect between silicon or oxide thereof and graphite by solving the technical problems so as to lower material polarization and improve material cycle performance. The negative electrode material is obtained by the steps of performing surface treatment and roasting and dispersing on silicon or oxide thereof, next, mixing with carbon micro powder and an organic carbon source, and performing coating, and finally carrying out carbonization treatment. Compared with the prior art, the silicon carbon negative electrode material prepared in the invention has relatively high cycling performance, excellent processability and easy batch production.

Description

technical field [0001] The invention relates to a lithium-ion battery negative electrode material and a preparation method thereof, in particular to a preparation method for a lithium-ion battery silicon-carbon composite negative electrode material. Background technique [0002] At present, graphite-based carbon materials still occupy a dominant position in the anode materials for lithium-ion batteries on the market. However, due to the constraints of graphite's own structural characteristics, it faces problems such as low theoretical capacity, low platform, and high-current charging and discharging are prone to produce lithium dendrites. Alloy anode materials show great advantages in terms of capacity, among which Si is the most representative. Si has a theoretical capacity of about 4200mAh / g, which is more than 10 times the theoretical capacity of graphite. Many researchers at home and abroad are committed to the practical application of Si negative electrodes. However, as...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525
CPCY02E60/10
Inventor 王圆方高川梁运辉代建国
Owner 天津爱敏特电池材料有限公司
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