Method for preparing porous lithium battery silicon-carbon negative electrode by screw extruder

A technology of screw extrusion and lithium battery, which is applied to battery electrodes, negative electrodes, secondary batteries, etc., and can solve problems such as effective control of difficult porous structures

Active Publication Date: 2020-12-29
孙斌
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] Aiming at the problem that it is difficult to effectively control the porous structure in the preparation process of the existing porous silicon carbon negative electrode materials, the present invention proposes a method for preparing porous lithium battery silicon carbon negative electrodes with a screw extruder

Method used

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  • Method for preparing porous lithium battery silicon-carbon negative electrode by screw extruder
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  • Method for preparing porous lithium battery silicon-carbon negative electrode by screw extruder

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Embodiment 1

[0033] A kind of screw extruder prepares the preparation of silicon carbon negative electrode of porous lithium battery:

[0034] (1). Ultrasonic dispersion of 40 parts by weight of styrene, 50 parts by weight of methyl methacrylate and 40 parts by weight of nano silicon powder in a mixed solvent of 100 parts by weight of tetrahydrofuran and 100 parts by weight of cyclohexane is configured as a suspension, and added 10 parts by weight of n-butyllithium initiator, react under protection of argon, form PS-b-PMMA block polymer coating nano-silicon particle, with described PS-b-PMMA block polymer coating nano-silicon particle After filtering and drying, add deionized water, and slowly add 38%wt acetic acid solution dropwise under ultraviolet light irradiation to obtain porous PS membrane-coated nano-silicon particles;

[0035] (2). The inorganic filler sodium chloride was added into deionized water to form a saturated solution, and 200 parts by weight of the porous PS membrane-coa...

Embodiment 2

[0039] A kind of screw extruder prepares the preparation of silicon carbon negative electrode of porous lithium battery:

[0040] (1). Ultrasonic dispersion of 40 parts by weight of styrene, 50 parts by weight of methyl methacrylate and 50 parts by weight of nano silicon powder in a mixed solvent of 100 parts by weight of tetrahydrofuran and 100 parts by weight of cyclohexane is configured as a suspension, and added 10 parts by weight of n-butyllithium initiator, react under protection of argon, form PS-b-PMMA block polymer coating nano-silicon particle, with described PS-b-PMMA block polymer coating nano-silicon particle After filtering and drying, add deionized water, and slowly add 38%wt acetic acid solution dropwise under ultraviolet light irradiation to obtain porous PS membrane-coated nano-silicon particles;

[0041] (2). Add the water-soluble inorganic filler sodium chloride into deionized water to configure a saturated solution, and disperse 200 parts by weight of the ...

Embodiment 3

[0046] A kind of screw extruder prepares the preparation of silicon carbon negative electrode of porous lithium battery:

[0047] (1). Ultrasonic dispersion of 40 parts by weight of styrene, 50 parts by weight of methyl methacrylate and 40 parts by weight of nano silicon powder in a mixed solvent of 100 parts by weight of tetrahydrofuran and 100 parts by weight of cyclohexane is configured as a suspension, and added 10 parts by weight of n-butyllithium initiator, react under protection of argon, form PS-b-PMMA block polymer coating nano-silicon particle, with described PS-b-PMMA block polymer coating nano-silicon particle After filtering and drying, add deionized water, and slowly add 38%wt acetic acid solution dropwise under ultraviolet light irradiation to obtain porous PS membrane-coated nano-silicon particles;

[0048] (2). Add the water-soluble inorganic filler sodium chloride into deionized water to configure a saturated solution, and disperse 200 parts by weight of the ...

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Abstract

The invention belongs to the technical field of lithium battery negative electrode preparation, and particularly relates to a method for preparing a porous lithium battery silicon-carbon negative electrode by a screw extruder. The method comprises the following steps: ultrasonically dispersing styrene, methyl methacrylate and nano silicon powder in a mixed solvent of tetrahydrofuran and cyclohexane, adding an n-butyl lithium initiator, reacting under argon protection to form coated nano silicon particles, filtering, drying, adding deionized water, and adding an acetic acid solution under ultraviolet irradiation to obtain porous PS film coated nano-silicon particles; adding a water-soluble inorganic filler into deionized water to prepare a saturated solution, dispersing the porous PS film coated nano-silicon particles into the saturated solution, and evaporating to remove water, so that the inorganic filler is crystallized in the nano-pores; carbonizing a product obtained after evaporation; And mixing the carbonized product with carbon powder, a binder and a paraffin lubricant, adding the mixture into the screw extruder, repeatedly extruding, soaking the extruded powder in deionizedwater, and drying to obtain the silicon-carbon composite material with a porous structure.

Description

technical field [0001] The invention belongs to the technical field of lithium battery negative electrode preparation, and in particular relates to a method for preparing a porous lithium battery silicon carbon negative electrode with a screw extruder. Background technique [0002] At present, the development of new energy is in full swing. In the field of mobile power, lithium-ion batteries have gradually replaced lead-acid batteries and nickel-metal hydride batteries, becoming the leader of the next generation of mobile power. However, lithium-ion batteries also have some unresolved "pain points", such as low capacity, long charge and discharge time, and poor cycle life. The optimization of negative electrode materials is one of the keys to solving these problems. At present, the anode materials of commercial lithium-ion batteries are mainly artificial graphite and natural graphite, but their theoretical specific capacity is relatively low, which is difficult to meet the m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1395H01M4/04H01M4/38H01M4/62H01M10/0525B82Y40/00
CPCB82Y40/00H01M4/0411H01M4/1395H01M4/386H01M4/625H01M4/628H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 陈庆廖健淞司文彬李钧
Owner 孙斌
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