33results about How to "Strong chemical bonding" patented technology

The invention discloses a preparation method of a lithium-sulfur battery cathode material based on a phosphorus-doped graphene supported nickel phosphide material. The method comprises the following steps: (1) adding a surface active agent into graphene oxide to obtain graphene oxide dispersion liquid; (2) adding a nickel source and alkali liquor into distilled water to obtain a saline solution; (3) adding the saline solution into the graphene oxide dispersion liquid, carrying out a hydrothermal reaction, then washing, and carrying out freeze drying to obtain a graphene composite material loaded with a nickel precursor; (4) enabling the graphene composite material loaded with the nickel precursor to be subjected to a phosphating reaction so as to obtain the phosphorus-doped graphene supported nickel phosphide material; (5) compounding the phosphorus-doped graphene supported nickel phosphide material with sublimed sulfur to obtain the lithium-sulfur battery cathode material based on thephosphorus-doped graphene supported nickel phosphide material. The phosphorus-doped graphene supported nickel phosphide material prepared by the method has a three-dimensional space structure, thus having an obvious domain limiting effect on sulfur and remarkably inhibiting the shuttle effect of lithium polysulfide.

The invention provides a metal nickel/nitrogen-doped carbon nanotube and a lithium-sulfur battery composite positive electrode material thereof. According to the material, with nickel nitrate and a nitrogen-containing organic matter adopted as raw materials, a metal nickel/nitrogen-doped carbon nanotube is prepared through a one-step high-temperature carbonization method, and is compounded with elemental sulfur through a melting-diffusion method, so that the material can be obtained; the carbon nano tube is of a bamboo joint-shaped structure; the tube diameter of the carbon nano tube is 15-75nm; a metallic nickel elementary substance is dispersed on a carbon nano tube network structure or embedded in the tube; and the particle size of the metallic nickel elementary substance is approximately consistent with the tube diameter of the carbon nano tube; and nitrogen elements are uniformly distributed on the carbon nanotube. According to the metal nickel/nitrogen-doped carbon nanotube and the lithium-sulfur battery composite positive electrode material thereof of the invention, the metal nickel/nitrogen-doped carbon nanotube is used for loading sulfur; the excellent conductivity of thenitrogen-doped carbon nanotube material, and the strong chemical interaction and electrode catalytic action of the metal nickel elementary substance on lithium polysulfide are utilized, so that the dissolution and shuttling of the lithium polysulfide can be greatly inhibited, and therefore, the lithium-sulfur battery composite positive electrode material with high specific capacity, high rate capability and high cycle stability can be obtained.

The invention relates to a preparation method of a battery separator. The preparation method comprises: providing a polyolefin porous membrane; adhering an oxidizing agent to the surface of the polyolefin porous membrane; providing a liquid-phase medium containing an organic silicon oxide, wherein the organic silicon oxide contains a methacryloxy group or at least two alkoxy groups, and the alkoxy groups and the methacryloxy group are respectively connected with silicon atoms; heating the polyolefin porous membrane with the surface adsorbed the oxidizing agent in the liquid-phase medium to polymerize the organic silicon oxide and grafting the polymerized organic silicon oxide with the polyolefin porous membrane; and providing an acidic environment or an alkali environment, placing the grafted polyolefin porous membrane in the acidic environment or the alkali environment, to perform a condensation reaction on silicon and oxide groups to form a silicon-oxide cross-linked network structure which is grafted with the polyolefin porous membrane. The invention also relates to the battery separator.

The invention provides a negative pole active material. The negative pole active material comprises a core body and a plurality of modified bodies attached to the external surface of the core body, wherein the core body is made from graphite and the modified bodies are made from stannate. The invention further provides a preparation method of the negative pole active material, which comprises the following steps of: mixing the graphite with aqueous liquid of soluble stannate, and adding an organic polymer and a complexing agent, thereby obtaining a mixed system; then dropwise adding aqueous liquid of a soluble metal salt into the mixed system, producing water-insoluble stannate as the soluble metal salt reacts with the soluble stannate, obtaining a precursor suspension after completing precipitation, and obtaining a precursor after filtering and drying; and carrying out heat treatment on the precursor, thereby obtaining the negative pole active material. The invention further relates to a lithium-ion battery containing the negative pole active material. The negative pole active material prepared by adopting the preparation method provided by the invention has the advantages of high capacity, stable structure and high charge-discharge cyclical stability.

The invention discloses an ink-jet printing based conductive circuit printing process. The process comprises the following specific steps: (1) base material preprocessing, (2) ink preparation, (3) printing and (4) conductive pattern forming. In the step of base material preprocessing, the surface of a base material is processed by successively utilizing air plasmas and a silane coupling agent solution; in the step of ink preparation, catalyst salt is dissolved in a solvent so as to prepare catalytic ink; in the step of printing, the catalytic ink prepared in the step (2) is printed on the base material processed through the step (1) by an ink-jet printer; and in the step of conductive pattern forming, chemical copper plating is performed on the base material printed with the catalytic ink so as to prepare a clear conductive pattern. The process disclosed by the invention overcomes defects of poor conductivity of a printed circuit, poor connectivity between a conductive layer and a base material and narrow selection of the printing base material of an existing process in which a conductive circuit is printed by directly using conductive ink and solidified.

The invention discloses a toughening type benzoxazine composite and a preparation method thereof. The toughening type benzoxazine composite is prepared by solidifying 75-96 parts of benzoxazine monomers, 3-20 parts of nylon 12 microspheres and 0.1-5 parts of benzoxazine monomer modified graphene oxide at the temperature of 160-200 DEG C. Benzoxazine monomer modified graphene oxide can effectively assist nylon 12 microspheres in uniformly dispersing in a benzoxazine resin matrix and thereby playing a role in synergistic toughening. The toughening type benzoxazine composite has high breaking tenacity, high Young modulus and high tensile strength. The toughening type benzoxazine composite can be widely applied to occasions with high requirements for the material toughness.

The invention discloses an anti-oxidation low-cost degradable agricultural starch-based composite mulching film. The composite mulching film is prepared from, by weight, 64-70 parts of dry basis corn starch, 23-26 parts of ethanol, 11-15 parts of monochloro acetic acid, 14-16 parts of silicon dioxide, 0.08-0.1 part of epoxy chloropropane, 60-80 parts of dimethylformamide, 1-3 parts of maltitol, 4-6 parts of medical stone fiber, 14-17 parts of orange peel powder, 4-5 parts of tea polysaccharide, 5-6 parts of polyvinyl alcohol, 2-3 parts of barium-zinc heat stabilizer, an appropriate amount of 85% ethanol solution and an appropriate amount of deionized water. The degradable agricultural mulching film has the good heat retaining property, pest removing property and oxidation resistance and is good in water blocking and air blocking properties, the film is easily formed and can be completely degraded and digested by microorganisms in the nature, and green and environmental protection are achieved.

The invention discloses a negative electrode material and a lithium ion battery containing the negative electrode material. The negative electrode material comprises graphite and silicon oxide particles attached to the surface of the graphite, the surface of the graphite contains unsaturated bonds; the silicon oxide particles are composed of a substance with a general formula of SiOx (x is greater than or equal to 0 and less than or equal to 2) and have an amorphous structure, and the maximum particle size of the silicon oxide particles is less than 0.5 [mu] m; at least one part of the surfaces of the graphite and the silicon oxide particles contains a coating, and the coating is a high-temperature carbonization product of an aromatic polymer. The graphite and the silicon oxide particles are coated with the high-temperature carbonized product of the aromatic polymer, so that the lithium intercalation kinetics of the negative electrode material can be improved, and the prepared lithium ion battery has high constant-current charge ratio, low cyclic lithium precipitation risk and good high-temperature storage performance.

The invention relates to a low-temperature sintered bioglass ceramic material for the dental department, and a preparation method of the bioglass ceramic material, belonging to the technical field of ceramic materials. In order to overcome the difficulty of Ca-P dental glass ceramics in the aspect of sintering temperature, the invention provides glass ceramics which can be prepared at lower temperature, has high chemical stability, low expansion coefficient and excellent mechanical property and biological performance, and takes apatite as a principal crystalline phase; the low-temperature sintered bioglass ceramic material for the dental department has a lower linear expansion coefficient, and the acid corrosion resistance of the material can be improved.

The invention belongs to the technical field of bioactive glass, and particularly relates to bioactive glass for dental operation filler, and a preparation method of the bioactive glass. The bioactiveglass comprises bioactive glass powder, which comprises the following components in parts by weight: 35-50 parts of SiO2, 20-30 parts of CaO and 15-30 parts of Na2O. According to the invention, through the special composition of the formula, the sintering temperature of the prepared bioactive glass powder is lower than 800 DEG C, so that the sintering temperature is greatly reduced, the processing technology difficulty and the requirement for equipment are effectively reduced, the preparation technology is simple and easy to operate, the processing cost is greatly reduced, the bending strength and the elasticity modulus are greatly improved, and the bioactive glass has good mechanical properties, good biological activity, biocompatibility and chemical stability, has a low linear expansioncoefficient, can directly generate strong chemical bonding with human bone tissue, has no toxic effect on the human tissue, and is an ideal dental operation filler.

The invention provides a three-dimensional bionic bone repair material and a preparation method thereof. The three-dimensional bionic bone repair material forms a porous structure comprising a plurality of parallel oriented fiber layers by a bidirectional freezing method, the oriented fiber layers are composed of reticular planes formed by the mutual penetrating of bioactive glass fibers, and crossing points of the bioactive glass fibers are bonded and interconnected by dopamine. By simulating the ordered structure of bone tissues, the repair material facilitates the repair of the bone tissues. Meanwhile, the fiber crossing points realize effective bonding interconnection through dopamine crosslinking, and the preparation process is simple. According to the invention, the polylactic acid composite three-dimensional bionic bone repair material can also be prepared by coating the bioactive glass fibers with polylactic acid, so that the toughness of the bioactive glass fibers is increased, and the mechanical property of the three-dimensional bionic bone repair material is further improved.

The invention belongs to the field of catalytic materials, and particularly relates to a millimeter ball catalyst for one-step synthesis of chiral alcohol and chiral ester from acetophenone. Metal andenzyme are assembled in the catalyst, the particle size is 0.9-3.0 mm, and the mechanical strength is as high as 3.0-15.0 N. A preparation method comprises the following steps of adding silicon oxidenanoparticles loaded with metal nanometer Pd and silicon oxide nanoparticles loaded with candida antarctica lipase B into deionized water, and performing uniform stirring and mixing to obtain a two-component silicon oxide mixed solution; continuously dripping the double-component silicon oxide mixed solution on tiled super-hydrophobic silicon oxide powder, and performing slow rolling to form a droplet millimeter ball which has a silicon oxide hydrophobic shell; collecting the droplet millimeter ball, and slowly drying the droplet millimeter ball; and finally, performing drip washing with acetone, and performing vacuum drying to obtain the millimeter ball for encapsulating the metal and enzyme dual-catalyst. The catalyst can be directly loaded into a fixed bed reactor to synthesize the chiral alcohol and the chiral ester from the acetophenone in one step.