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Conductive agent for negative electrode of lithium ion battery and preparation method for battery containing conductive agent

A conductive technology for lithium-ion batteries and negative electrodes, which is applied in battery electrodes, secondary batteries, and secondary battery repair/maintenance, etc. It can solve the problem of decreased rate performance and cycle performance, increased resistance to lithium ion diffusion, and increased coating volume, etc. problem, to achieve the effect of improving cycle performance, increasing rate performance, and improving rate performance

Active Publication Date: 2018-10-12
安普瑞斯(无锡)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as the coating amount increases, the electrochemical performance of lithium ions, especially the rate performance and cycle performance, will decline significantly.
This is mainly because the electrodes of lithium-ion batteries are mainly porous structures composed of particles, in which the pores are complex and tortuous, and increasing the coating amount will significantly increase the resistance of lithium ions to diffuse in it.

Method used

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  • Conductive agent for negative electrode of lithium ion battery and preparation method for battery containing conductive agent
  • Conductive agent for negative electrode of lithium ion battery and preparation method for battery containing conductive agent
  • Conductive agent for negative electrode of lithium ion battery and preparation method for battery containing conductive agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040]1) Disperse 1g of polyacrylonitrile, 3ml of N-trimethylsilimidazole, and 0.6g of citric acid into 12mL of dimethylformamide solvent, and stir the mixed solution for 4 hours to disperse;

[0041] 2) Inject the uniformly dispersed precursor solution into a plastic syringe connected with a stainless steel needle, the diameter of which is 0.9mm;

[0042] 3) Adjust the injection rate of the syringe to 0.2mL / min through the precision propeller, and place an aluminum collector at about 15cm in the direction of the stainless steel needle to collect the prepared SiQDs / CNFs precursor;

[0043] 4) The prepared SiQDs / CNFs precursor was pre-oxidized in air for 1.5d, and then dried in a vacuum oven at 100°C for 10h;

[0044] 5) Place the dried precursor in a tube furnace with a protective atmosphere (argon:hydrogen = 95:5) for high-temperature carbonization. The high-temperature carbonization temperature is set to 700°C, the heating rate is 10°C / min, and the carbonization time is 8h,...

Embodiment 2

[0049] 1) Disperse 1g of polyimide, 2ml of N-trimethylsilimidazole, and 0.4g of citric acid into 12mL of dimethylformamide solvent, and stir the mixed solution for 3 hours to disperse;

[0050] 2) Inject the uniformly dispersed precursor solution into a plastic syringe connected with a stainless steel needle, the diameter of which is 0.9 mm;

[0051] 3) Adjust the injection rate of the syringe to 0.25mL / min through the precision propeller, and place an aluminum collector at about 15cm in the direction of the stainless steel needle to collect the prepared SiQDs / CNFs precursor;

[0052] 4) The prepared SiQDs / CNFs precursor was pre-oxidized in air for 2 days, and then dried in a vacuum oven at 100 °C for 10 hours;

[0053] 5) Place the dried precursor in a tube furnace with a protective atmosphere (argon:hydrogen = 95:5) for high-temperature carbonization. The high-temperature carbonization temperature is set to 700°C, the heating rate is 10°C / min, and the carbonization time is ...

Embodiment 3

[0058] 1) Disperse 1g of polyacrylonitrile, 2ml of aminopropyltrimethoxysilane, and 0.3g of ascorbic acid into 10mL of dimethylformamide solvent, and stir the mixed solution for 3 hours to disperse;

[0059] 2) Inject the uniformly dispersed precursor solution into a plastic syringe connected with a stainless steel needle, the diameter of which is 0.9 mm;

[0060] 3) Adjust the injection rate of the syringe to 0.2mL / min through the precision propeller, and place an aluminum collector at about 15cm in the direction of the stainless steel needle to collect the prepared SiQDs / CNFs precursor;

[0061] 4) The prepared SiQDs / CNFs precursor was pre-oxidized in air for 1.5d, and then dried in a vacuum oven at 95°C for 10h;

[0062] 5) Place the dried precursor in a tube furnace with a protective atmosphere (argon: hydrogen = 95:5) for high-temperature carbonization. The high-temperature carbonization temperature is set to 800°C, the heating rate is 10°C / min, and the carbonization time...

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Abstract

The invention relates to a conductive agent for a negative electrode of a lithium ion battery and a preparation method for the battery containing the conductive agent. Silicon quantum dots SiQDs are mixed into micropores of carbon nanofibers CNFs by adopting an electrospinning technology, and a compound SiQDs / CNFs of the silicon quantum dots / carbon nanofibers is synthesized, and then the compoundSiQDs / CNFs is used as the conductive agent for the negative electrode of the lithium ion battery. The silicon quantum dots prepared in the method have a very small size, an effect of buffering the volume expansion of silicon particles can be effectively achieved by the micropore structures of the carbon nanofibers in a circulation process, the damage of the volume expansion of silicon in a lithiumintercalation process to an electrode structure is solved, and meanwhile, through the porous structures in the carbon nanofibers, a diffusion path of lithium ions can be greatly shortened, the diffusion speed of the lithium ions is increased, and solid-phase diffusion is improved. The battery designed by the composite conductive agent prepared by the method has a great improvement in the aspectsof the energy density, the power density and the cycling performance.

Description

technical field [0001] The invention relates to a lithium-ion battery negative electrode conductive agent and a preparation method for a battery containing the conductive agent, belonging to the technical field of lithium-ion batteries. Background technique [0002] The rapid development of smart phones, electric vehicles, and smart grids has placed higher and higher requirements on the energy density, power density, and cycle performance of lithium-ion batteries. According to the requirements of the Ministry of Industry and Information Technology, in 2020, the specific energy of lithium-ion battery cells should reach 300Wh / kg. As we all know, the improvement of the specific energy of lithium-ion batteries is inseparable from the progress of material technology. [0003] The theoretical specific capacity of traditional graphite anode materials is only about 372mAh / g. At present, some modified artificial graphite materials have reached about 360mAh / g, but there is limited ro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/62H01M10/42H01M10/0525
CPCH01M4/362H01M4/386H01M4/583H01M4/624H01M4/625H01M10/0525H01M10/4235Y02E60/10
Inventor 孔丽娟徐子福张德仁张明慧
Owner 安普瑞斯(无锡)有限公司
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