A preparation method of a silicon clad composite material based on porous carbon

Abstract

The invention discloses a preparation method of a silicon-coated composite material based on porous carbon, which comprises the following steps: step 1, adding phenolic resin into absolute ethanol, stirring to complete dissolution, adding polyvinylpyrrolidone, stirring to complete dissolution, and obtaining mixed dispersion liquid ; 2, adding an aluminum chloride solution into the mixed dispersionliquid for ultrasonic reaction for 10 to 20 min, and then introducing concentrated ammonia water into the suspension to obtain a mixed suspension; 3, ultrasonically reacting the mixed suspension for1 to 3 h, and then performing reduced pressure distillation reaction to realize complete evaporation to obtain mix solid; 4, adding the mixed solid into a reaction kettle for sealing non-oxygen carbonization for 3 to 8 h, taking out, and soaking in a hydrochloric acid solution for 30 to 60 min, removing and drying to obtain a porous carbon structure; 5, adding a nano silicon material and a silanecoupling agent into absolute ethanol, and performing ultrasonic treatment to uniformly disperse to obtain a silicon-based coating liquid; 6, soaking the porous carbon structure into the silicon-basedcoating liquid for 10 to 15 min later, taking out and drying, and then carrying out a reduction reaction for 2 To 4 h to obtain a composite material.

Description

technical field [0001] The invention belongs to the technical field of silicon materials, and in particular relates to a method for preparing porous carbon-based silicon-coated composite materials. Background technique [0002] Lithium-ion batteries are energy storage devices that have attracted much attention. In recent years, lithium-ion batteries have been widely used in portable electronic devices, and their applications in vehicles such as automobiles have also attracted much attention. [0003] The working principle of a lithium-ion battery is roughly as follows: when the battery is charged, the anode (that is, the negative electrode) absorbs lithium ions from the cathode, and absorbs electrons from the external circuit through the charging device, and releases these ions and electrons back to the cathode when the battery is discharged. The mass-specific capacity is an important parameter for anode materials because it determines the amount of lithium ions the battery...

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problems in the prior art, the present invention provides a method for preparing a silicon-coated composite material based on porous carbon, which solves the problem of fragility and pulverization of carbon-silicon composite particles in the prior art