33results about How to "Eliminates coating process" patented technology

The invention provides a graphene composite electrode which comprises a current collector and electrode active materials arranged on the surface of the current collector, wherein the electrode active materials comprise graphene and manganese dioxide. The graphene is in a stratified structure and is arranged on the surface of the current collector, and the manganese dioxide is arranged on the surface of the graphene in the stratified structure. Mass percentage content of the graphene in the electrode active materials is 80%-90%. In addition, the invention further relates to a preparation method and an application of the graphene composite electrode. Oxidized graphene and the manganese dioxide are deposited on the current collector step by step, adhesion agents are not needed, and therefore equivalent series resistance of the whole electrode is reduced effectively, capacity and pseudocapacitance of an electric double-layer of the graphene and the manganese dioxide are developed simultaneously, and stability and conductivity of the electrode are well improved by addition of the graphene. In addition, through the method of electro-deposition, the electrode materials are directly deposited on an electrode plate, a complex coating process is saved, the process is simple, and time is short.

The invention discloses a crystal boundary diffusion method for improving the coercive force and the thermal stability of a neodymium-iron-boron magnet, and belongs to the field of rare earth permanent magnet materials. According to the method, a quaternary alloy Dy-Ni-Al-Cu with a low melting point is used as a diffusion source and melted and prepared into a rapid-hardening strip, after coarse breaking, the strip casting is laid around the neodymium-iron-boron magnet, and by the adoption of a heat treatment method, the rapid-hardening strip diffuses and enters the magnet along the crystal boundary. After the processing, the coercive force of the magnet is significantly improved, and the magnetic energy product is improved to a certain extent; meanwhile, since the temperature of the diffusion treatment is low, energy consumption can be reduced, the cost can be lowered, and Nd2Fe14B crystal grains can be prevented from growing up; compared with a coating and magnetron sputtering method, the crystal boundary diffusion method omits a powder preparing and coating process in a coating technology and a thin film preparing process in a magnetron sputtering technology. After the technology processing of the crystal boundary diffusion method, the neodymium-iron-boron magnet with the high coercive force and the high thermal stability is finally obtained.

The invention belongs to the field of electrochemical materials, and discloses a grapheme/carbon nano tube/nickel electrode and a preparation method thereof. The preparation method of the composite material comprises the following steps: a graphene oxide and carbon nano tube mixed solution is prepared; a graphite oxide/carbon nano tube/nickel electrode is prepared through electrophoresis; and the grapheme/carbon nano tube/nickel electrode is prepared. The invention provides the preparation method of the grapheme/carbon nano tube/nickel electrode; as the graphite oxide/carbon nano tube material is directly deposited on an electrode plate, a complicated coating process can be omitted, the process is simple, and the time is short; in addition, equivalent series resistance (ESR) of the graphite oxide/carbon nano tube/nickel electrode is reduced, so that the power density of a super capacitor is increased more efficiently.

The invention discloses a variable-spacing anti-light curtain and a preparation method thereof. The variable-spacing anti-light curtain comprises a base material layer and a prismatic structure layerarranged on the outer surface of the base material layer, and is characterized in that a plurality of prisms which are parallel to one another in the horizontal direction and have triangular sectionsare arranged on the prismatic structure layer; the distances between the prisms are gradually increased from bottom to top; the upper side surfaces of the prisms are light absorption surfaces; and thelower side surfaces of the prisms are reflective surfaces and are coated with a reflective coating respectively. The distance of the prismatic structure layer in the longitudinal direction of the curtain is adjusted, the distance is gradually increased from bottom to top, the prisms below can be effectively prevented from shielding the prisms adjacent to the prisms above, and the reflecting surfaces of the prisms can completely play a role. According to the structural design, raw materials of the prismatic structure layer are saved, the manufacturing cost is reduced, on the premise that the same reflection area is maintained, the light absorption area is increased, the absorption rate of ambient light is additionally increased, interference of the ambient light is reduced, and the contrast ratio is increased.

The invention discloses a vulcanized polyacrylonitrile film with hollow tubular nanofibers and a binder-free lithium sulfide battery positive electrode prepared from the film. The process of preparingthe film is as follows: S1, respectively configuring a polyacrylonitrile shell solution and a core layer solution; 2. Prepare composite nanofibers by use coaxial electrospinning technology; S3. The prepared composite nanofiber is washed in solvent, dried and vulcanized to obtain the vulcanized polyacrylonitrile film. A lithium sulfide battery positive electrode is prepare by adopting that nano-fiber in the sulfide polyacrylonitrile film of the invention, which is hollow tubular and has a great specific surface area, without the traditional coat process, and the positive electrode can be fullycontacted with the electrolyte, thereby improving the utilization rate of the electrode; at the same time, sulfide polyacrylonitrile is insoluble in the electrolyte, avoiding the shuttle effect of polysulfide, alleviating the volume expansion effect of the battery, and improving the electrochemical performance of the electrode. The positive electrode of the lithium sulfur battery has a higher energy density and a more stable and lasting cycle life.

The invention relates to a method for preparing a nanometer lanthanum oxide coating on a metal carrier. The method is characterized in that a lanthanum oxide layer directly grows on a metal substrate through a pulse electrochemical deposition method, and the thickness of the deposition layer is adjustable within the range of 1-50 microns. The prepared lanthanum oxide deposition layer is of a nanometer flaky structure, and the thickness is 5-20 nm. The specific surface area of the deposition layer is large and has a high bonding capacity with the substrate, and the effect is better than a common coating process. Therefore, the method for preparing the nanometer lanthanum oxide coating on the metal carrier has high practical value.

The invention belongs to the field of electrochemistry energy sources, and discloses a nitride substituted graphene oxide electrode and a preparation method thereof. The preparation method of the electrode comprises the following steps: adding graphene oxide into a container which is filled with water and the bottom of which is provided with a metal concentrate body, stirring, then standing and carrying out deposition treatment, then taking out the metal concentrate body of the concentrate graphene oxide and drying, thereby obtaining the graphene oxide electrode; and placing the graphene oxide electrode in a reactor, and then introducing the mixed gas of ammonia and argon to the reactor for substitution reaction, thereby obtaining the nitride substituted graphene oxide electrode. The preparation method of the nitride substituted graphene oxide electrode provided by the invention is simple in preparation process, and parameters can be controlled; the application cost is low, and the using is wide; and meanwhile, the normally used coating technology used in the prior art is omitted, fluorination is realized by one step in the process of preparing the electrode sheet, and multiple complex flows in the material fluorination process are omitted.

The invention discloses a fluoro graphene oxide electrode and a preparation method thereof, belonging to the field of electrochemical energy sources. The preparation method of the fluoro graphene oxide electrode comprises the following steps of: adding graphene oxide to a container, stirring, standing, depositing, then taking out metal concentrates concentrating the graphene oxide to dry to prepare a graphene oxide electrode; and adding the graphene oxide electrode into a reactor, and following charging mixed gas of fluorine and nitrogen into the reactor to carry out a substitution reaction to manufacture the fluoro graphene oxide electrode. The preparation method of the fluoro graphene oxide electrode, disclosed by the invention, has the advantages of simple technical skill, controllable parameters, low implementation cost and wide application; in addition, a common coating process at the present stage is saved, fluorination is implemented in an electrode plate manufacturing process once, and multiple complex flows in a material fluorination process are saved.

The invention discloses a graphene electrode plate and a preparing method thereof. The method comprises the following steps: graphene and ionic liquid are mixed and then subjected to the ultrasonic dispersion process to obtain stable graphene suspending liquid; and the graphene suspending liquid is used as an electrolyte, two aluminum foils or copper foils which are made from a same material are inserted into the electrolyte in parallel as an anode electrode and a cathode electrode separately, a voltage is applied after electrical connection, and the cathode electrode is taken down to obtain the graphene electrode plate. According to the preparing method provided in the invention, grapheme can be better dispersed by using the ionic liquid, and the ionic liquid exists between layers of the deposited graphene, so the compatibility between the graphene and the electrolyte can be changed, and the capacity can be improved; according to the electrode plate prepared through the electro-deposition method, the complex coating process can be omitted, the process is simple, and binder does not need to be used, so the contact resistance between a current collector and an active material layer can be effectively reduced so as to reduce the equivalent series resistance of a supercapacitor, and improve the power density finally.

The invention discloses a wafer temporary bonding method. The method includes the steps that a silicon through hole and front face manufacturing technology of a wafer is completed; the front face of the wafer is coated with temporary bonding glue; the surface of a supporting piece is roughened; the roughened surface of the supporting piece is bonded with the front face, coated with the temporary bonding glue, of the wafer; the back face of the wafer bonded with the supporting piece is thinned until the thickness of the wafer reaches a needed value; a back face manufacturing technology of the wafer after the back face is thinned is finished; the temporary bonding glue on the wafer after the back face manufacturing technology is removed. According to the method, due to the fact that the surface of the supporting piece is roughened, the contact area between the temporary bonding glue and the supporting piece is increased, and the temporary bonding glue is nested and fixed and prevented from sliding and offsetting at high temperature.

The invention discloses a preparation method of an asymmetric supercapacitor based on a prussian blue analog/reduced graphene thin film. The preparation method comprises the following steps of preparing graphene oxide on the basis of a Hummers method, preparing reduced graphene, preparing prussian blue analog with different central metal atoms, and preparing a reduced graphene dispersion liquid and a prussian blue analog dispersion liquid; adopting a vacuum suction filtration method for preparing a composite thin film with the reduced graphene and prussian blue analog with a layer-by-layer stacking structure; and finally, by taking the prepared reduced graphene and prussian blue analog composite thin film as positive and negative materials, preparing the asymmetric supercapacitor. The prepared prussian blue analog/graphene composite material thin film prepared by the method has the layer-by-layer stacking structure, so that the problem that a graphene-based electrode is easily stackedin the preparation process is solved; the advantages of graphene and prussian blue analog are combined, so that a better synergistic effect can be generated; and meanwhile, the preparation method is simple and low in cost.

The invention relates to a preparation method of an active nano porous nickel/nickel oxide load ultra-thin nickel cobaltate nanosheet flexible electrode material. The method is characterized in that nano porous nickel prepared by natural dealloying is utilized as a template, through three-electrode electrochemical deposition, an ultra-thin ultra-fine nickel cobaltate nanosheet is grown on a surface of the nanoporous nickel and then heated to obtain the ultrathin nickel cobaltate nanosheet flexible electrode material. The method is advantaged in that firstly, the nickel cobaltate nanosheet is constructed on the surface of the nano porous template, close combination of the nickel cobaltate nanosheet and nano pores is achieved, and improvement of cycle stability is facilitated; the prepared nickel cobaltate nanosheet is ultra-thin and ultra-fine, has thickness of only 10-20 nm, has a larger effective specific surface area when participating in electrode reaction, has more active sites andrepresents better electrochemical performance.

The invention discloses a preparation process of a color ink-jet printing photographic paper. The process includes the steps of: (1) photographic paper surface treatment, (2) ink absorption layer preparation, and (3) gloss layer preparation. The invention perform reasonable optimization treatment on the existing printing photographic paper preparation technology, eliminates the prime paint coatingprocedure in the original technology, lowers the process complexity, and reduces adding of chemical paints. The preparation process provided by the invention is conducive to lowering the processing cost and reducing the paper thickness, and under the cooperation of the steps together, and the finally prepared printing photographic paper has enhanced ink absorption, glossiness, light resistance, folding resistance and the like, and good comprehensive usage quality, thus having substantial market competitiveness.

The invention relates to the technical field of battery pole pieces, in particular to a method for preparing a silicon-carbon negative electrode plate by extrusion and calendering, which comprises thefollowing steps: mixing PEDOT:PSS, chloroplatinic acid and dimethyl sulfoxide to obtain modified PEDOT:PSS slurry; mixing nano silicon powder, carbon fibers, sodium carboxymethyl cellulose, styrene-butadiene rubber emulsion with the mass concentration of 30% and deionized water to obtain silicon powder/carbon fiber composite slurry; stirring and extruding the PEDOT:PSS slurry and the silicon powder/carbon fiber composite slurry to obtain paste; and carrying out blade coating on the paste to form a film. According to the invention, the problems of peeling and cracking of the silicon-carbon negative electrode plate in the prior art are solved. According to the preparation method, the flexible PEDOT:PSS thin film is adopted to replace an existing metal foil, and the negative electrode material is directly loaded on an electrode plate, so that the problem of poor compatibility between the negative electrode active material and the electrode plate in a traditional coating process is avoided. The preparation method is simple and controllable in process and suitable for large-scale and continuous production.

A thermoelectric module according to an embodiment of the present invention may comprise: a cold sink; a thermoelectric element having a heat absorption surface coupled to the cold sink; a heat sink coupled to a heating surface of the thermoelectric element to dissipate heat transferred from the cold sink to the outside of the thermoelectric element; and a sealing cover for connecting the edge of the cold sink and the edge of the heat sink to surround the thermoelectric element, wherein the cold sink, the heat sink, and the thermoelectric element may be integrally formed by the sealing cover.

In addition, the thermoelectric element may be a cascade type thermoelectric element in which two thermoelectric elements having the same or different specifications are coupled to each other.

A composition and method for microbial control on a material surface using a minimum risk pesticide such as a GRAS antimicrobial/preservative component. The GRAS antimicrobial/preservative component is preferably an organic acid.

The invention relates to a method for preparing a copper-silver alloy hydrogen evolution catalyst through friction stir processing. A blocky metal copper plate, a copper sheet and a silver sheet are used as raw materials; the metal copper plates and the copper-silver sheets arranged in a staggered mode are fixed to a workbench of a friction stir welding machine through a clamp, the silver sheets and the copper sheets are clamped between the two copper plates in a staggered mode, and the overlapping width of the copper-silver sheets is smaller than the diameter of a stirring head; a stirring head with a shaft shoulder is used; when machining begins, the stirring head is aligned with the copper-silver sheet, the stirring head is adjusted to be pressed downwards until the stirring needle is completely immersed into machining metal, and the stirring head automatically rotates and advances to the other end along one end of the copper-silver sheet for mixing once; the surface copper-silver boundary disappears; a metal strip extruded by a cut stirring head is directly used as a catalyst. The problem that an existing non-solid-solution metal alloying method is not suitable for block materials is solved. Friction stir processing is applied to the field of electro-catalysis for the first time, the process is simple and convenient to operate, toxic reaction raw materials are not used, and the method is an environment-friendly green synthesis process.