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A kind of silicon quantum dot self-assembled lithium battery electrode material and preparation method

A technology of silicon quantum dots and electrode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as increased internal resistance, particle breakage, electrode deformation, etc., and achieve the effect of preventing detachment and reducing particle breakage

Active Publication Date: 2018-01-30
东营市东凯园区运营管理有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the process of charging and discharging lithium, the volume of silicon material changes greatly, which is easy to cause the silicon particles to break, so that the electrode is seriously deformed, the silicon particles are separated from the conductive network, and the internal resistance increases, resulting in rapid capacity decay and cycle performance. Lithium deintercalation is easy to cause particle breakage, and the volume change of large particles in the electrode makes the silicon particles separate from the conductive network.

Method used

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  • A kind of silicon quantum dot self-assembled lithium battery electrode material and preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Weigh the material according to the ratio of 1:1 between elemental silicon and chemical blowing agent n-pentane;

[0023] (2) Put the above two substances into the high-speed ultra-fine dispersion mixer, set the number of revolutions to 5000 rpm, feed inert gas into the high-speed ultra-fine dispersion mixer, start the machine, and start the high-speed ultra-fine dispersion after 10 minutes For the temperature rise program of the mixer, set the temperature rise rate to 5°C / min, stop the heat rise when the temperature reaches 300°C, and continue high-speed shear mixing for 30 minutes;

[0024] (3) Weigh the product obtained in step (2) and the stripping agent sodium chloride according to the ratio of 10:1, and then send it into a high-speed ultra-fine dispersion mixer, set the parameter at 5000 rpm, at room temperature, High-speed shear mixing for 15 minutes;

[0025] (4) Start the heating program of the rotary vibrating extruder. After reaching 50-60°C, load the mi...

Embodiment 2

[0028] (1) Weigh the material according to the ratio of 1:2 between elemental silicon and chemical blowing agent n-hexane;

[0029] (2) Put the above two substances into the high-speed ultra-fine dispersion mixer, set the number of revolutions to 6000 rpm, feed inert gas into the high-speed ultra-fine dispersion mixer, start the machine, and start the high-speed ultra-fine dispersion after 15 minutes For the temperature rise program of the mixer, set the temperature rise rate to 5°C / min, stop the heat rise when the temperature reaches 300°C, and continue high-speed shear mixing for 40 minutes;

[0030] (3) Weigh the material obtained in step (2) and sodium sulfate according to the ratio of 10:3, and then send it into a high-speed ultra-fine dispersion mixer, set the parameters at 8000 rpm, at room temperature, high-speed shear Mix for 20 minutes;

[0031] (4) Start the heating program of the rotary vibrating extruder. After reaching 50-60°C, load the mixture in step (3), set ...

Embodiment 3

[0034] (1) Weigh the material according to the ratio of 1:2 between elemental silicon and chemical blowing agent n-pentane;

[0035] (2) Put the above two substances into the high-speed ultra-fine dispersion mixer, set the number of revolutions to 8000 rpm, feed inert gas into the high-speed ultra-fine dispersion mixer, start the machine, and start the high-speed ultra-fine dispersion after 10 minutes For the temperature rise program of the mixer, set the temperature rise rate to 5°C / min, stop the heat rise when the temperature reaches 300°C, and continue high-speed shear mixing for 35 minutes;

[0036] (3) Weigh the material obtained in step (2) and the stripping agent magnesium chloride according to the ratio of 10:2, and then send it into a high-speed ultra-fine dispersion mixer, set the parameters at 7000 rpm, at room temperature, high-speed shear Cut and mix for 15 minutes;

[0037] (4) Start the heating program of the rotary vibrating extruder. After reaching 50-60°C, l...

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Abstract

The invention discloses a silicon quantum dot self assembly lithium cell electrode material and preparation method, an elementary silicon under the protection of idle gas through a machine strips off a silicon quantum dot of quantum dot grade, then self assembles with tin anhydride nanometer, and electric conductivity agent granule into a diameter of 10-20 Mum large granule shape electrode material, the advantage is, quantum grade staying silicon greatly diminishes the occurrences of lithium disembedding causing broken granule, drawn tin anhydride nanometer buffers the size change of large electron granule, and further in self assembly process uses electric conductivity agent as graphene, charcoal nanometer tube or charcoal fiber, prevents effectively the breaking off of silicon granule and electric conductivity network.

Description

technical field [0001] The invention relates to the technical field of lithium battery electrode material production, in particular to a silicon quantum dot self-assembled lithium battery electrode material and a preparation method. Background technique [0002] With the application and development of lithium batteries in power vehicles, the original reliable and stable carbon anode is difficult to meet the needs of the rapidly developing lithium batteries. On the one hand, the potential of the carbon electrode is very close to the potential of metal lithium. When the battery is overcharged, metal lithium is easy to precipitate on the surface of the carbon electrode, which may form lithium dendrites and cause a short circuit. The mismatch between the organic solvent and the carbon negative electrode may make lithium ions The power battery burns. On the other hand, with the continuous increase in the capacity of new cathode materials, the capacity of the carbon anode cannot ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/38H01M4/48H01M4/62H01M4/36H01M10/0525
CPCH01M4/362H01M4/386H01M4/387H01M4/483H01M4/624H01M10/0525Y02E60/10
Inventor 陈庆曾军堂陈兵王镭迪
Owner 东营市东凯园区运营管理有限公司