2results about How to "Improved cycle rate performance" patented technology

The invention discloses a lithium ion battery high-entropy alloy modified silicon-oxygen-carbon composite material as well as a preparation method and application thereof. The innermost layer of the composite material is a multiphase inorganic-organic SiOC material, the middle layer of the composite material is SiOC loaded with a high-entropy alloy, the composite material has a micro-mesoporous structure from inside to outside, and the outermost layer of the composite material is a high-conductivity carbon tube. The composite material prepared by the invention takes an interface as a starting point and takes layer-by-layer superposition as a path to finally generate a shell with a complete structure. By forming a high-entropy alloy modified coating layer which is internally and externally communicated on the surface of SiOC, the ion and electron conductivity can be remarkably improved, more lithium storage active points are provided, heteroatom-doped high-conductivity carbon tubes grow on the catalytic surface, the impedance of the material in the charge-discharge process is reduced, and the cycle rate performance of the material is improved.

This invention discloses a graphite-coated Prussian blue and its analogues, their preparation method, and applications, belonging to the field of graphite material preparation technology. The method includes: mixing graphite with one or more of ferric chloride or transition metal chlorides at a mass ratio of 10-0.5, placing the mixture in a reaction apparatus, and purging the apparatus with a protective gas; heating the reaction apparatus to obtain a solid powder; mixing sodium ferrocyanide with the solid powder at a molar mass ratio of 4-1 and adding it to deionized water, with a solid-to-deionized water mass ratio of 1:50-500, and then stirring the reaction for 12-48 hours; filtering the solution after the reaction. This invention uses a protective gas atmosphere to vaporize ferric chloride or transition metal chlorides at high temperature, allowing the ferric chloride or transition metal to be perfectly incorporated into the interlayer spaces of graphite. Then, the sodium ferrocyanide aqueous solution reacts fully with the ferric chloride or transition metal chloride inside the graphite to obtain a graphite structure completely coated with Prussian blue.