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Silicon-carbon composite material, lithium-ion battery, preparation method and application

A silicon-carbon composite material and paste technology, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of low initial Coulombic efficiency, poor cycle performance, and low initial reversible capacity, and achieve simple and easy process and low cost. Low, excellent electrochemical performance

Active Publication Date: 2022-01-28
SHANGHAI SHANSHAN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is to overcome the defects of low initial reversible capacity, low initial coulombic efficiency and poor cycle performance of silicon-carbon negative electrode materials in the prior art, and provide a silicon-carbon composite material, lithium ion battery and its preparation method, application

Method used

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  • Silicon-carbon composite material, lithium-ion battery, preparation method and application
  • Silicon-carbon composite material, lithium-ion battery, preparation method and application
  • Silicon-carbon composite material, lithium-ion battery, preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0115] Mix 300g of silicon powder whose volume average particle diameter D50 is 5 μm with Tween 20 and ethanol according to the mass ratio of 100:0.5:1000, and carry out ultrafine grinding to obtain a nano-silicon slurry whose volume average particle diameter D50 is 100nm. Silicon slurry and 1g of γ-aminopropyltriethoxysilane are added to 1000g of molten epoxy resin, stirred and mixed, and the ethanol is removed by distillation under reduced pressure at 80°C, then 400g of phthalic anhydride is added and solidified at 100°C React for 6 hours to obtain a cured product of nano-silicon and epoxy resin; put the obtained cured product into a well-type furnace and raise the temperature to 600°C for 1 hour under the protection of nitrogen at 2°C / min, then cool down to room temperature and discharge, using a jaw crusher and After coarse crushing by the roller machine, it is crushed and classified by the airflow crushing and classifying machine, and the particle size (D50) is adjusted to...

Embodiment 2

[0117] 500g of silicon powder with a volume average particle diameter D50 of 5 μm, cetyltrimethylammonium bromide, and ethanol are mixed according to the mass and number ratio of 100:0.5:1000 and then ultrafinely ground to obtain a volume average particle diameter D50 of 70nm The nano-silicon slurry, the obtained nano-silicon slurry and 1g gamma-(methacryloyloxy)propyltrimethoxysilane were added to 1000g of molten epoxy resin and stirred evenly, and the ethanol was removed by distillation under reduced pressure at 80°C. Then add 400g of phthalic anhydride and cure at 100°C for 6 hours to obtain a cured product of nano-silicon and epoxy resin; put the obtained cured product into a well-type furnace and raise the temperature to 600°C at 2°C / min under nitrogen protection Pre-carbonize for 1 hour, cool down to room temperature and discharge, use jaw crusher and double-roller for coarse crushing, then use airflow milling classifier to crush and classify, use compressed air 9MPa, fee...

Embodiment 3

[0119] 500g of silicon powder, Tween 20, and ethanol with a volume average particle diameter D50 of 5 μm are mixed according to the ratio of mass and number of 100:0.5:1000 and then ultrafinely ground to obtain a volume average particle diameter D50 of nano-silicon slurry of 100 nm. Add 1000g of phenol and 1g of γ-aminopropyltriethoxysilane to the nano-silicon slurry, remove half of the ethanol by distillation under reduced pressure at 80°C, then add 1020g of furfural and cure at 60°C for 6 hours to obtain nano-silicon and phenol furfural resin The cured product; put the obtained cured product into a well-type furnace and raise the temperature to 800 ℃ for 1 hour under the protection of nitrogen at 2 ℃ / min, cool down to room temperature and discharge the material, use the jaw crusher and double-roller for coarse crushing, and then use the air flow Grinding and classifying machine for crushing and grading treatment, adjust the particle size (D50) to about 10 μm with compressed a...

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Abstract

The invention discloses a silicon-carbon composite material, a lithium ion battery, a preparation method and an application. The preparation method comprises the following steps: (1) mixing the mixed solution of the additive, substance A and nano-silicon slurry with substance B, and undergoing a curing reaction to obtain a cured resin; substance A is liquid resin or monomer A of liquid resin ; When substance A is a liquid resin, substance B is a curing agent; when substance A is a monomer A of a liquid resin, substance B is a monomer B of a liquid resin, and substance A and substance B are obtained through a curing reaction to solidify the resin (2) After pre-carbonization treatment, carbonization treatment and coating treatment, the cured resin in step (1) is obtained. When the silicon-carbon composite negative electrode material prepared by the present invention is used as the negative electrode of the battery, the battery has high first-time reversible capacity, high first-time Coulombic efficiency, good cycle performance, excellent electrochemical performance, high product stability and consistency, and can meet high performance requirements. Requirements for lithium-ion batteries on the charge and discharge performance of negative electrode materials.

Description

technical field [0001] The invention relates to the field of lithium-ion batteries, in particular to silicon-carbon composite materials, lithium-ion batteries, preparation methods and applications. Background technique [0002] With the development of electronic appliances, space technology, national defense equipment and new energy vehicles in the direction of high energy density and longevity, the performance of existing lithium-ion batteries is becoming more and more difficult to meet the current high standard requirements. As a vital part of lithium-ion batteries, anode materials have a profound impact on the overall performance of batteries due to their energy density and cycle life. At present, the negative electrodes of lithium-ion batteries used in production mainly use graphite materials. Graphite negative electrode materials have a layered structure and can store a certain amount of lithium ions. However, the theoretical lithium storage capacity is only 372mAh / g, w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525
CPCH01M4/366H01M4/386H01M4/625H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 葛传长范拯华曾繁俊沈龙吴志红
Owner SHANGHAI SHANSHAN TECH CO LTD
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