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A modified conductive polymer-coated silicon-based negative electrode material and its preparation method and application

A technology of conductive polymers and negative electrode materials, applied in the direction of active material electrodes, negative electrodes, battery electrodes, etc., can solve the problems of low compaction density and easy crushing, and achieve the goal of inhibiting agglomeration, inhibiting volume expansion, and improving cycle performance Effect

Active Publication Date: 2022-03-04
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the compaction density of this material is low, and it is easy to be crushed during the battery manufacturing process.

Method used

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  • A modified conductive polymer-coated silicon-based negative electrode material and its preparation method and application
  • A modified conductive polymer-coated silicon-based negative electrode material and its preparation method and application
  • A modified conductive polymer-coated silicon-based negative electrode material and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032]Put silicon oxide (SiO) in a rotary kiln protected by nitrogen gas, and after raising the temperature to 1100°C at a rate of 5°C / min, feed a mixture of nitrogen and acetylene with a volume ratio of 1:1 and keep it warm for 0.5h. During the whole sintering process, the rotation speed of the rotary kiln was kept at 2r / min, and the material was discharged at room temperature to obtain a CVD-coated SiO / C material, which was designated as product A. Add 6g of dodecylbenzenesulfonic acid into a beaker and place it in an ice bath, then add 14mL of deionized water to the beaker for emulsification, stir and mix evenly, then take 30g of product A and add it to the above emulsion, mix evenly to obtain an emulsion b. Add 3g of epoxy acrylic resin to 12g of tetrahydrofuran, stir well to obtain solution C, then add solution C to emulsion B, mix well to obtain mixed solution D, then add 9g of aniline dropwise to mixed solution D, mix well Then add 9g of hydrogen peroxide and 10mL of d...

Embodiment 2

[0036] Put silicon oxide (SiO) in a rotary kiln protected by helium gas, raise the temperature to 800°C at a rate of 5°C / min, and then feed a mixed gas of helium and methane with a volume ratio of 5:1 and keep it warm for 6 hours During the whole sintering process, the rotating speed of the rotary kiln was kept at 0.1r / min, and the material was discharged at room temperature to obtain a CVD-coated SiO / C material, which was designated as product A. Add 6g of dodecylbenzenesulfonic acid into a beaker and put it in an ice bath, then add 54mL of deionized water to the beaker for emulsification, stir and mix evenly, then take 60g of product A and add it to the above emulsion, mix evenly to obtain an emulsion b. Add 3g of epoxy acrylic resin to 4.5g of tetrahydrofuran, stir well to obtain solution C, then add solution C to emulsion B, mix well to obtain mixed solution D, then add 3g of aniline dropwise to solution D, mix well Then add 9g of hydrogen peroxide and 10mL of deionized w...

Embodiment 3

[0038] Put silicon oxide (SiO) in a rotary kiln protected by argon gas, raise the temperature to 900°C at a rate of 5°C / min, and then feed a mixed gas of argon and ethylene with a volume ratio of 2:1 and keep it warm for 4 hours During the whole sintering process, the rotating speed of the rotary kiln was kept at 0.5r / min, and the material was discharged at room temperature to obtain a CVD-coated SiO / C material, which was designated as product A. Add 6g of dodecylbenzenesulfonic acid into a beaker and put it in an ice bath, then add 34mL of deionized water to the beaker for emulsification, stir and mix evenly, then take 40g of product A and add it to the above emulsion, mix evenly to obtain an emulsion b. Add 3g of epoxy acrylic resin to 7g of tetrahydrofuran, stir well to obtain solution C, then add solution C to emulsion B, mix well to obtain mixed solution D, then add 6g of thiophene dropwise to solution D, mix well Add 12g of hydrogen peroxide and 10mL of deionized water,...

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Abstract

The invention discloses a modified conductive polymer-coated silicon-based negative electrode material and its preparation method and application, and relates to the technical field of lithium-ion batteries. , to obtain a carbon-coated SiO / C composite material; add water to the organic protonic acid for emulsification, then add the SiO / C composite material, stir and disperse to obtain an emulsion; add epoxy acrylic resin to tetrahydrofuran, stir to dissolve, Add emulsion to it and stir to obtain a mixed solution; add polymer monomers to the mixed solution, then add hydrogen peroxide solution, stir and react, filter, wash, purify, and dry after the reaction to obtain a modified conductive polymer coated silicon-based anode material. The invention sequentially coats the carbon layer and the highly conductive semi-interpenetrating network composite film on the surface of the silicon oxide, suppresses the volume expansion of the silicon oxide, improves the electrical conductivity, improves the interface performance of the material, and further improves the cycle performance of the material.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a modified conductive polymer-coated silicon-based negative electrode material, a preparation method and application thereof. Background technique [0002] With the development of electric vehicles and portable appliances, the demand for lithium-ion batteries with high energy density is also increasing. The theoretical specific capacity of traditional graphite anode materials is only 372mAh / g, which is difficult to meet market demand. Silicon materials have a capacity of 4200mAh / g for the first time, a higher lithium-intercalation platform, rich crustal storage, and environmental friendliness, which have gradually attracted widespread attention from researchers. [0003] However, the volume expansion of silicon can reach up to 300%. During the cycle, it will not only cause silicon to separate from the surrounding conductive carbon network to form "dead silicon", bu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/62H01M10/0525
CPCH01M4/366H01M4/483H01M4/624H01M4/625H01M10/0525H01M2004/027Y02E60/10
Inventor 王辉王庆莉林少雄许家齐辛昱张辰
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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