40results about How to "Increasing interlamellar spacing" patented technology

The invention relates to a preparation method for a titanium carbide nanosheet / graphene composite material capable of being used as an anode of a lithium ion battery, belonging to the field of synthesis and preparation of a nano ceramic material. The preparation method aims at solving the problems of complicated preparation process and low efficiency of the traditional Ti3C2T<x> / graphene composite material. The method comprises the following steps of: 1, preparing Ti3AlC2 powder; 2, preparing a stacked layered Ti3C2T<x> powder body; 3, preparing a suspension liquid; 4, taking the prepared layered Ti3C2T<x> powder body; and 5, combining with graphene oxide, and completing. According to the preparation method, only the Ti3C2T<x> powder body is needed to be prepared, the graphene oxide is taken as a raw material and can be directly bought in the market, the preparation period of the raw material is relatively short, and the surface of the graphene oxide also contains a functional group, is high in hydrophilic performance, and can be easily combined with the Ti3C2T<x>; and moreover, only one time of pumping filtration is required, efficiency is high, the process is simple, and the method has high promotion and application value.

The invention discloses functionalized graphene. A general structural formula of the functionalized graphene is represented in the specification, wherein X is an epoxy group, Y is graphene, Z is any one of alkyl groups of C1-C6, and the functionalized graphene is prepared by grafting graphene oxide onto a product obtained through reaction of a phosphorus and chlorine compound, epoxy structure containing monomers and phenol monomers in an environment without water. After the functionalized graphene is added to rigid polyurethane foam, the functionalized graphene as an intrinsic type flame retardant can better perform functions on the basis of good dispersibility, flame retardancy and compressibility of the rigid polyurethane foam are greatly improved, the density and the heat insulating performance of the rigid polyurethane foam can be equivalent to those of common rigid polyurethane foam, besides, a preparation technology of the functionalized graphene and the rigid polyurethane foam is simple and easy, and large-scale popularization and application can be performed conveniently.

The invention provides a preparation method and application of montmorillonite-graphene composite powder. The preparation method of the montmorillonite-graphene composite powder comprises the following steps: (1) letting montmorillonite adsorb an organic dye to be saturated, centrifuging and washing, and drying to obtain organic dye-adsorbed waste montmorillonite, wherein the mass ratio of montmorillonite to the organic dye is 1: (0.3-1); and (2) calcining the organic dye-adsorbed waste montmorillonite at 600-700 DEG C for 2-4 h under the inert atmosphere protection so as to obtain the montmorillonite-graphene composite powder. By using waste montmorillonite as a raw material, the montmorillonite-graphene composite powder with montmorillonite and graphene uniformly intercalated is prepared by a one-step method. After the montmorillonite-graphene composite powder is modified with a silane coupling agent, the modified product is used as a filling material to prepare a polymer composite material. Then, properties of the polymer composite material, such as tensile strength and impact strength, etc., are effectively enhanced.

The invention discloses a preparation method of a composite type positive electrode material for a lithium battery. The preparation method comprises the following steps: ultrasonically dispersing graphene oxide into deionized water, adding cerium acetate, potassium acetate, urea and ammonia water into a container, and performing sealing, baking, drying and microwave treatment to prepare a cerium oxide / graphene compound; preparing rare earth metal ion doped lithium iron phosphate from raw materials such as lithium hydroxide, iron phosphate, oxalic acid, glucose and rare earth metal oxide; performing ultrasonic dispersion and ball milling on the cerium oxide / graphene compound, the rare earth metal ion doped lithium iron phosphate and ethanol to prepare cerium oxide / graphene rare earth metalion doped lithium iron phosphate; and performing stirring, microwave treatment and calcination on the raw materials such as the lithium hydroxide, ferric vanadate, phosphoric acid, deionized water andthe cerium oxide / graphene rare earth metal ion doped lithium iron phosphate to prepare the composite type positive electrode material for the lithium battery. The composite type positive electrode material prepared by the method has excellent electrical performance; moreover, the preparation method is clean and environment-friendly.