Preparation process of synthetic silicon electrode with foam conductive network as carrier

Abstract

The invention relates to a preparation process of a synthetic silicon electrode with a foam conductive network as a carrier. With a foam conductive network as a carrier, organic silicon hydrolysis andsilicon dioxide deposition are carried out, the organic silicon and the silicon dioxide are mixed with aluminum chloride, thermal reduction is carried out, and an ethanol mixture of a carbon materialand polyvinylidene fluoride is sprayed, so as to obtain a foam conductive network / SiOx / C electrode. The foam conductive network is composed of framework metal and sacrificial metal. The framework metal includes one or more of nickel, iron, copper, tin and silver. The sacrificial metal includes one or more of magnesium, aluminum and lithium. The mole ratio of the framework metal to the sacrificialmetal is 0.1-5. The mole ratio of the sacrificial metal to the silicon is 1-4. The mole ratio of the sacrificial metal to aluminum chloride is 0.8-1.2. The ethanol mixture of a carbon material and polyvinylidene fluoride includes one or more of graphene oxide, multi-walled nanotubes, single-walled carbon nanotubes, carbon black, graphene, acetylene black, activated carbon, graphite, carbon microspheres, polyaniline and polypyrrole. The negative electrode material has good electrochemical properties, and has a good application prospect in the field of lithium ion batteries.

Description

technical field [0001] The invention relates to a preparation process for a silicon electrode, in particular to a preparation process for synthesizing a silicon electrode with a foam conductive network as a carrier. Background technique [0002] Silicon is a new generation of lithium-ion battery anode material, which has advantages such as high electrochemical capacity, abundant reserves, and low price; however, silicon has poor conductivity and large volume changes during charging and discharging, resulting in low electrochemical capacity and poor cycle life of silicon. its commercial application. At present, researchers mainly use the following methods to improve the electrochemical performance of silicon; 1) silicon nanoparticles, thin films, and nanowires. Compared with micron-sized silicon particles, nano-silicon materials have a larger specific surface area under the same conditions, which is conducive to the full contact of the material with the current collector and...

AI Technical Summary

Problems solved by technology

[0003] At present, the preparation of negative electrodes for lithium-ion batteries still requires active materials to be mixed with conductive carbon and binders, and then coated on copper sheets to prepare electrode sheets; the addition of conductive carbon, binders, and copper sheets not only increases the preparation cost, but also increases the production cost. Reduce the mass content of the active material silicon particles on the electrode sheet, and reduce the electrochemical capacity of the lithium ion negative electrode sheet