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Silicon-based negative electrode material and preparation method thereof

A silicon-based negative electrode material and silicon-coated technology, applied in the direction of negative electrodes, battery electrodes, active material electrodes, etc., can solve the problems of inconspicuous material performance advantages and complicated preparation process, so as to avoid repeated generation and improve electrochemical performance , the effect of inhibiting volume expansion

Inactive Publication Date: 2015-12-02
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Although the above methods have improved the electrochemical performance of silicon-based negative electrode materials to varying degrees, the preparation process is relatively complicated, and the performance advantages of the prepared materials are not obvious.

Method used

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  • Silicon-based negative electrode material and preparation method thereof
  • Silicon-based negative electrode material and preparation method thereof
  • Silicon-based negative electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Use an electronic balance to weigh 0.72g of polyacrylonitrile and 0.16g of silicon nanoparticles into a 20ml sample bottle, inject 7.36g of NN dimethylformamide, seal the sample bottle with a sealing film, and heat to 60℃ for stirring. 24 hours, ultrasonic dispersion for 1 hour. Cut out the aluminum foil paper with an area of ​​40cm×40cm tightly on the plate collector, take the spinning solution sample into the injection needle tube, connect the positive electrode of the high-voltage generator to the spinneret, and the negative electrode of the plate collector, adjust the injection pump The solution flow rate is 0.8ml / h, the distance between the spinneret and the receiving plate is set to 17cm, and the spinneret diameter is 0.43mm. When it is stably extruded, turn on the high-voltage generator to the set voltage of 18kV, and obtain silicon / polypropylene through a flat plate collector Nitrile nanofibers.

[0029] (2) Remove the fiber from the collector, and lay it clos...

Embodiment 2

[0034] (1) Use an electronic balance to weigh 0.72g of polyacrylonitrile and 0.16g of silicon nanoparticles into a 20ml sample bottle, inject 7.36g of NN dimethylformamide, seal the sample bottle with a sealing film, and heat to 60℃ for stirring. 24 hours, ultrasonic dispersion for 1 hour. Cut out the aluminum foil paper with an area of ​​40cm×40cm tightly on the plate collector, take the spinning solution sample into the injection needle tube, connect the positive electrode of the high-voltage generator to the spinneret, and the negative electrode of the plate collector, adjust the injection pump The solution flow rate is 0.8ml / h, the distance between the spinneret and the receiving plate is set to 17cm, and the spinneret diameter is 0.43mm. When it is stably extruded, turn on the high-voltage generator to the set voltage of 18kV, and obtain silicon / polypropylene through a flat plate collector Nitrile nanofibers.

[0035] (2) Remove the fiber from the collector, and lay it clos...

Embodiment 3

[0040] (1) Use an electronic balance to weigh 0.72g of polyacrylonitrile and 0.16g of silicon nanoparticles into a 20ml sample bottle, inject 7.36g of NN dimethylformamide, seal the sample bottle with a sealing film, and heat to 60℃ for stirring. 24 hours, ultrasonic dispersion for 1 hour. Cut out the aluminum foil paper with an area of ​​40cm×40cm tightly on the plate collector, take the spinning solution sample into the injection needle tube, connect the positive electrode of the high-voltage generator to the spinneret, and the negative electrode of the plate collector, adjust the injection pump The solution flow rate is 0.8ml / h, the distance between the spinneret and the receiving plate is set to 17cm, and the spinneret diameter is 0.43mm. When it is stably extruded, turn on the high-voltage generator to the set voltage of 18kV, and obtain silicon / polypropylene through a flat plate collector Nitrile nanofibers.

[0041] (2) Remove the fiber from the collector, and lay it clos...

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Abstract

The invention relates to the field of lithium ion battery negative electrode materials, in particular to a silicon-based negative electrode material and a preparation method thereof. The silicon-based negative electrode material is carbon-wrapped silicon / carbon nanometer fiber and comprises carbon nanometer fiber loaded with silicon nanometer particles, and a carbon wrapping layer having a secondary protection effect on the silicon nanometer particles exposed on the surface of the carbon nanometer fiber. According to the silicon-based negative electrode material, due to the fact that the carbon wrapping layer is introduced to the surface of the fiber, the conductivity of the material and the structural integrity can be effectively improved, the volume expansion of the silicon nanometer particles on the surface of the fiber can be restrained, the phenomena of silicon particle crushing and SEI membrane repeated generation are avoided, and the mechanical strength of the negative electrode material is improved. The electromechanical performance of the obtained material is obviously improved compared with a traditional silicon / carbon composite nanometer fiber negative electrode material.

Description

Technical field [0001] The invention relates to the field of lithium ion battery negative electrode materials, in particular to a silicon-based negative electrode material and a preparation method thereof. Background technique [0002] Lithium-ion battery is a secondary battery (rechargeable battery) that mainly relies on the movement of lithium ions between the positive and negative electrodes. Generally, lithium-containing compounds are used as the positive electrode material of the battery. During charge and discharge, Li + Intercalation and deintercalation between two electrodes: when charging, Li + Deintercalation from the positive electrode and inserting into the negative electrode through the electrolyte, the negative electrode is in a lithium-rich state; the opposite is true during discharge. The better the lithium storage performance of the negative electrode material, the higher the charge-discharge specific capacity of the battery. Therefore, the negative electrode mat...

Claims

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Application Information

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IPC IPC(8): H01M4/38H01M4/62H01M4/134H01M4/1395H01M10/0525
CPCH01M4/134H01M4/1395H01M4/362H01M4/386H01M4/62H01M10/0525H01M2004/027Y02E60/10
Inventor 胡毅陈艳丽沈桢陈仁忠何霞
Owner ZHEJIANG SCI-TECH UNIV
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