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Compound binder of silicon-based negative electrode for lithium ion batteries and preparation method thereof

A lithium-ion battery, silicon-based negative electrode technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of inconspicuous conductive structure effect, inability to meet silicon-based negative electrodes, etc., to avoid binder structure breakage, suitable for The effect of mass production, maintaining electrical connectivity and mechanical integrity

Inactive Publication Date: 2018-03-30
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these reports only involve the simple mixing of various polymers, and most of the binders used are still traditional insulating binders, and mainly improve the adhesion, which has no obvious effect on maintaining the conductive structure during the expansion process, and still cannot Meet the needs of silicon-based negative electrodes for new binders

Method used

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  • Compound binder of silicon-based negative electrode for lithium ion batteries and preparation method thereof
  • Compound binder of silicon-based negative electrode for lithium ion batteries and preparation method thereof

Examples

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Effect test

Embodiment 1

[0020] A composite binder for a silicon-based negative electrode of a lithium-ion battery, the raw materials of which include: polyamide-imide and polyaniline, wherein the weight ratio of polyamide-imide and polyaniline is 4:1.

[0021] The preparation method of the composite binder for the silicon-based negative electrode of the lithium-ion battery comprises the following steps: stirring the polyimide copolymer, the conductive polymer, and N-methylpyrrolidone at room temperature for 5 hours, and then heating up to 60° C. Medium-baking for 5 hours to remove N-methylpyrrolidone, then high-speed ball milling for 3 hours, heating up to 60° C., and drying in an oven for 5 hours to obtain a composite binder for silicon-based negative electrodes of lithium-ion batteries.

Embodiment 2

[0023] A composite binder for a silicon-based negative electrode of a lithium ion battery, the raw materials of which include polyimide and polypyrrole, wherein the weight ratio of polyimide and polypyrrole is 10:1.

[0024] The preparation method of the composite binder of the silicon-based negative electrode of the lithium-ion battery comprises the following steps: stirring the polyimide copolymer, the conductive polymer, and N-methylpyrrolidone at room temperature for 10 hours, and then raising the temperature to 80° C. Medium-baked for 10 hours to remove N-methylpyrrolidone, then high-speed ball milled for 5 hours, heated to 80° C., and baked in an oven for 5 hours to obtain a composite binder for silicon-based negative electrodes of lithium-ion batteries.

Embodiment 3

[0026] A composite binder for silicon-based negative electrodes of lithium-ion batteries, the raw materials of which include: polyetherimide and polyethylenedioxythiophene, wherein the weight ratio of polyetherimide and polyethylenedioxythiophene is 6 :1.

[0027] The preparation method of the composite binder of the silicon-based negative electrode of the lithium-ion battery comprises the following steps: stirring the polyimide copolymer, the conductive polymer, and N-methylpyrrolidone at room temperature for 8 hours, and then raising the temperature to 70° C. Medium-baked for 8 hours to remove N-methylpyrrolidone, then high-speed ball milled for 4 hours, heated to 70°C, and baked in an oven for 8 hours to obtain a composite binder for silicon-based negative electrodes of lithium-ion batteries.

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Abstract

The invention discloses a compound binder of a silicon-based negative electrode for lithium ion batteries. The compound binder comprises the following raw materials: a polyimide copolymer and a conducting polymer. The invention also discloses a preparation method of the compound binder of a silicon-based negative electrode for lithium ion batteries. The preparation method comprises the following steps: stirring and blending the polyimide copolymer, the conducting polymer and N-methyl pyrrolidone, carrying out primary drying to remove N-methyl pyrrolidone, then carrying out ball-milling, and carrying out secondary drying to obtain the compound binder of the silicon-based negative electrode for lithium ion batteries. According to the compound binder disclosed by the invention, the raw materials are low in price and easily obtained, the operation is simple, and the binder is applicable for large-scale production; and the compound binder prepared in the invention is high in mechanical property and has electrical conductivity and caking property simultaneously, the electrical connection and mechanical integrity of the electrode in the circulation process can be maintained preferably, and the connectivity of a conductive network in the expansion process can be maintained more effectively, so that the cycle performance is effectively improved.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a composite binder for a silicon-based negative electrode of a lithium-ion battery and a preparation method thereof. Background technique [0002] Due to the advantages of high energy density, excellent rate and power performance, long cycle life, safety and environmental protection, lithium-ion batteries are widely used as important chemical power sources in our daily life. In addition to long-term application in digital products such as traditional mobile phones and portable computers, the application range of lithium-ion batteries has gradually expanded to high-tech fields such as electric vehicles, aerospace and energy storage. At the same time, the energy density and safety of lithium-ion batteries are both important put forward higher requirements. [0003] The current commercial lithium-ion batteries generally use graphite anodes, which have a low gram capac...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M10/0525
CPCH01M4/622H01M4/624H01M10/0525Y02E60/10
Inventor 梁大宇高田慧包婷婷陈龙
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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