A preparation method of high-performance carbon-silicon composite material for lithium batteries

Abstract

The invention belongs to the technical field of lithium batteries, in particular to a method for preparing a high-performance carbon-silicon composite material for lithium batteries, comprising the following steps: step 1, putting nano-carbon materials and nano-silicon materials into absolute ethanol and stirring evenly , and then put it into a ball mill for constant temperature ball milling for 1-3h to obtain a mixed alcohol solution; step 2, add hydroxypropyl cellulose to the mixed alcohol solution and stir evenly, and ultrasonically react for 30-60min to obtain a dispersed suspension; step 3, Put the dispersed suspension in a vacuum distillation kettle for 30-70 minutes to obtain a viscous liquid; step 4, add the viscous liquid to distilled water and stir evenly, put it into a grinding tool for gradient solidification distillation reaction 3- 6h, to obtain the carbon-silicon composite preform; Step 5, adding the carbon-silicon composite preform to the reactor for gradient anaerobic carbonization reaction for 5‑7h, to obtain the carbon-silicon composite nanomaterial. The invention solves the problems of friability and pulverization of carbon-silicon composite particles in the prior art.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, and in particular relates to a preparation method of a high-performance carbon-silicon composite material for lithium batteries. 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 lit...

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 high-performance carbon-silicon composite material for lithium batteries, which solves the problems of fragility and pulverization of carbon-silicon composite particles in the prior art