46results about How to "Block direct contact" patented technology

The invention belongs to the field of sodium-ion batteries, and discloses a sodium-ion battery electrolyte and a sodium-ion battery. The sodium-ion battery electrolyte comprises sodium salt, an organic solvent and an organic molecular additive shown in the following formula, wherein R1 to R5 are respectively and independently any one of F, Cl, Br, I, CN, H, OH, SH and NO2. A boron atom in the molecular structure of the additive is used as an electron-deficient center and can be preferentially complexed with anions or solvent molecules in the electrolyte to pre-stabilize an electrode interface; the bond energy of the B-O bond is moderate, so that the oxidation potential of the B-O bond is lower than that of a main body carbonate solvent, the B-O bond can be preferentially decomposed in the first charge-discharge process, and a thin, compact and highly stable positive electrode electrolyte interface film is formed on the surface of a positive electrode; the controllable substituent group on the benzene ring further regulates the decomposition potential of molecules through an electronic effect, so that the film forming time and the film property can be precisely regulated and controlled. The stable CEI can effectively inhibit continuous decomposition of the electrolyte at high temperature and high pressure, and the cycling stability of the battery in the high-temperature and high-pressure environment is remarkably improved.

This invention provides a surface acoustic wave (SAW) filter, comprising a piezoelectric layer and interdigitated electrodes. The interdigitated electrodes are disposed on the piezoelectric layer and include at least a first metal layer and a second metal layer stacked together. The first metal layer is made of platinum or an alloy with platinum as the main component, and the second metal layer is made of aluminum or an alloy with aluminum as the main component. By setting the material of the second metal layer to aluminum or an alloy with aluminum as the main component, the uniformity of metal coverage of the electrode structure can be effectively improved, avoiding excessive local resistance or structural defects caused by poor coverage. Setting the material of the first metal layer to platinum or an alloy with platinum as the main component provides reliable support for the second metal layer, reducing the risk of deformation or corrosion of the aluminum layer in subsequent processes. By using a stacked structure of two complementary materials for the interdigitated electrodes, both structural miniaturization and improved overall electrical performance and structural reliability of the interdigitated electrodes are achieved.

This utility model discloses an electronic device connector cable, comprising a connector body, a connector, and a dustproof assembly. The connector end has a plug-in portion for connecting electronic devices. The dustproof assembly includes a hollow dust cover, a spring, and a cover. One end of the dust cover is inserted into an annular groove at the connector end. An outer limiting slider slides against a limiting groove on the inner wall of the annular groove, ensuring its movement in a specific direction. A first mounting portion of the protruding outer part of the dust cover and a second mounting portion on the connector fix the spring, providing elasticity in its normal state, allowing the dust cover to protrude from the connector. The cover is detachably installed at the opening of the dust cover, covering the plug-in portion. This connector cable, through the cooperation of the dust cover and cover, effectively blocks dust and moisture from contacting the plug-in portion, avoiding poor contact caused by dust accumulation. During insertion and removal, the dust cover is compressed by external force and retracts along the limiting groove, without affecting use. After the external force disappears, it automatically resets under the action of the spring, continuously protecting the plug-in portion and preventing dust accumulation and damage.

The invention relates to the technical field of lithium ion batteries, in particular to a composite positive electrode material and a preparation method thereof, a lithium ion battery and electric equipment. The invention provides a preparation method of a composite positive electrode material, which comprises the following steps: mixing a bulk phase dopant, a lithium source and a ternary precursor to obtain a mixture I, and respectively sintering at 815-830 DEG C for 12-14 hours and at 760-770 DEG C for 8-10 hours to obtain a sintered material I-1 and a sintered material I-2; a first coating agent and a second coating agent are mixed with the sintered material I-1 and the sintered material I-2 respectively and then coated, and a sintered material II-1 and a sintered material II-2 are obtained; and mixing the sintered material II-1 and the sintered material II-2 to obtain the composite positive electrode material. According to the invention, the bulk phase dopant and the doped ternary precursor core layer are firstly added, then the first coating agent and the second coating agent are added, and the surface functional layer is synthesized, so that the composite positive electrode material has both high capacity and high cycle stability under the synergistic effect of the bulk phase dopant and the doped ternary precursor core layer.

The invention relates to a positive electrode active material and a preparation method thereof, a positive electrode and a lithium ion battery. The positive electrode active material comprises lithium manganate particles and a sodium phytate layer coating the surfaces of the lithium manganate particles. According to the technical scheme, in the positive electrode active material, the sodium phytate layer serves as a coating layer, and six phosphate groups in molecules of the sodium phytate layer and manganese ions dissolved out of lithium manganate particles can form a stable complex, so that the dissolved-out manganese ions are efficiently captured and prevented from being further migrated into an electrolyte to damage the performance of a battery; meanwhile, the sodium phytate layer forms a layer of compact physical barrier on the surfaces of the lithium manganate particles, so that direct contact between the lithium manganate particles and an electrolyte can be effectively blocked, and dissolution of manganese ions is inhibited from the source. Through a synergistic effect of a chelation effect and a physical barrier effect of the sodium phytate layer, the dissolution amount of manganese ions can be remarkably reduced, and the crystal structure of lithium manganate particles is prevented from being distorted, so that the structural stability of the positive electrode active material is improved.

This invention provides an electropolymer-modified aluminum current collector, its preparation method, and its application, relating to the field of aluminum foil current collector technology. By modifying the current collector surface, it primarily addresses the interface problem between the current collector and the active material, thereby improving the performance of lithium-ion batteries. This invention uses an aluminum foil current collector as the anode, a graphite plate as the cathode, and an acidic solution of a conductive polymer monomer as the electrolyte. Anodizing electropolymerization is performed using a constant current or constant voltage method, followed by washing and drying to obtain the electropolymer-modified aluminum current collector. The conductive polymer monomer is at least one of aniline, thiophene, and pyrrole; the concentration of the conductive polymer monomer in the electrolyte is 0.1-1.0 mol / L; and the polymerization time is 5-10 min. This invention effectively reduces the contact resistance between the current collector and the active material, improves the bonding strength between the coating and the substrate, and enhances the corrosion resistance of the current collector, showing promising application prospects.

The invention discloses a preparation method of dimeticone aerosol, and belongs to the technical field of pharmaceutical preparations. The method comprises the following steps: (a) adding 0.6%-1% by mass of dimeticone and 0.25%-0.58% by mass of menthol into a medicinal aluminum tank or stainless steel tank with the inner wall coated with an inert material, and stirring for 5-30 minutes at 100-500 rpm under the protection of nitrogen to form uniform and transparent liquid; (b) sealing and filling dimethyl ether with the purity not lower than 99.9% at the temperature of 10-20 DEG C to serve as a propellant, and enabling the content of the dimethyl ether to reach 98.42%-99.15%; and (c) valve assembly and sealing are completed under the conditions that the temperature is 15-30 DEG C and the relative humidity is smaller than or equal to 60%, and standing balancing is conducted for 12-48 hours at the temperature of 25 DEG C. According to the dimeticone propellant disclosed by the invention, the problems of poor compatibility of dimeticone and the propellant, instability in long-term storage, easiness in layering or valve blockage and the like are effectively solved by virtue of synergistic measures of limiting the component proportion, adopting high-purity dimethyl ether, controlling the particle size of menthol, using an inert coating container, protecting by nitrogen and the like.

The invention provides an anti-sticking asphalt cold patch material with a core-shell structure and a preparation method thereof.The anti-sticking asphalt cold patch material with the core-shell structure sequentially comprises an inner core, a bonding layer and an anti-sticking layer from inside to outside, the bonding layer comprises resin and asphalt, and the anti-sticking layer comprises a fatty acid compound; the fatty acid compound is at least one of long-chain unsaturated fatty acid, long-chain saturated fatty acid or ester derivatives thereof; the fatty acid compound comprises a non-polar long chain with the alkyl chain length of C12-C18 and a polar group, and the polar group comprises any one of an ester group and a carboxyl group. The anti-sticking asphalt cold patch material with the core-shell structure does not need compaction equipment and heating equipment during construction, an anti-sticking layer formed by the fatty acid compound can be destroyed only by means of a driving load, so that a cementing material in the bonding layer flows again and is bonded with each other, and meanwhile, stable structural strength is formed by virtue of an embedding and extruding effect among aggregates.

This invention discloses a sea urchin-shaped oxygen-rich vacancy O vac This paper describes a CuO@ZIF-8 core-shell structured photothermal catalyst, its preparation method, and its application, belonging to the fields of photocatalytic materials and artificial nitrogen fixation technology. The technical solution is as follows: the catalyst has a core-shell structure, with the core being urchin-shaped copper oxide (CuO) microspheres. These microspheres are assembled from radially arranged one-dimensional nanoneedles or nanospikes, and the surface of the core contains oxygen vacancies (O). vac The shell is an in-situ grown ultrathin zeolite imidazole ester framework material, ZIF-8, which possesses hydrophobic and molecular diffusion channel properties. This invention also constructs a matching biomimetic three-phase interface photothermal reaction system. Through the synergy of a hydrophilic substrate supplying water and a hydrophobic, permeable shell, it achieves a balance between gas diffusion and proton supply, reducing the submersion of active sites by liquid water and the occurrence of side reactions. This invention has significant advantages such as high photothermal conversion efficiency, mild preparation conditions, and high gas-liquid interface mass transfer efficiency.

The application provides an encapsulation adhesive film composition for a copper grid photovoltaic cell, an encapsulation adhesive film and a preparation method thereof, a copper grid line and a photovoltaic cell, and relates to the field of photovoltaics. The raw materials of the encapsulation adhesive film composition for the copper grid photovoltaic cell include, in parts by weight: 100 parts of a base resin, 1-2 parts of an ultraviolet resistance agent, 0.2-1.5 parts of an initiator, 0.2-1.5 parts of a co-crosslinking agent, 0.1-0.5 parts of an adhesion promoter, 0.1-0.5 parts of a light stabilizer, 0.5-3 parts of a nano barrier material, 0.1-1 parts of a metal passivation agent, 0.2-2.5 parts of an antioxidant, and 2-10 parts of an organic solvent. The antioxidant includes benzotriazole and phosphite. By compounding the antioxidant, the nano barrier material and the passivation agent, the oxidation and electrochemical corrosion of the copper grid line are inhibited, and the water and oxygen barrier performance of the adhesive film is improved.

The invention discloses an iron-silicon-chromium alloy composite material with high magnetic conductivity and low loss and a preparation method thereof, and the preparation method comprises the following steps: the main component comprises the following components in percentage by mass: 95-99.5% of iron-silicon-chromium alloy powder; and 0.5%-5% of inorganic nano aluminum oxide. The preparation method comprises the following steps: carrying out wet ball milling treatment on Fe-Si-Cr magnetic powder and nano aluminum oxide by adopting a mechanical alloying method, drying after treatment to obtain a mixed dry material, adding epoxy resin glue into the mixed dry material, and finally carrying out dry-wet granulation to obtain a target product, namely the Fe-Si-Cr alloy composite material. According to the invention, through the process combination of mechanical alloying and granulation, an insulating system compositely coated with inorganic nano aluminum oxide and epoxy resin is obtained, and firm coating of an insulating layer and good formability of composite powder are realized, so that the magnetic conductivity of the alloy is greatly improved, the loss of the alloy is reduced, the magnetic conductivity of the alloy is 43.2 at-100 kHz, and the loss of the alloy is 328.8. A soft magnetic composite material solution with excellent comprehensive performance is provided for related industries, and the requirements for integration and reliability in the fields of integrally-formed inductors, transformers and the like are met.

The invention relates to the technical field of biomedical administration, and particularly discloses double-layer hydrogel suitable for the interior of a bladder. The double-layer hydrogel comprises a hydrophilic adhesion slow-release layer and a hydrophobic protective layer; the hydrophilic adhesive slow-release layer and the hydrophobic protective layer are respectively obtained by curing a hydrophilic adhesive slow-release hydrogel precursor solution and a hydrophobic protective hydrogel precursor solution. By adopting a layered progressive double-hydrogel synergistic structure, an integrated administration barrier of mucous membrane adsorption-drug sustained release-physical protection is formed, so that the double-layer hydrogel has excellent bladder mucous membrane adhesion performance in a water environment and a stable and controllable drug sustained release effect, and the problems that an existing bladder perfusion drug is easily diluted and washed by urine, and the drug sustained release effect is poor are solved. The medicine action time is short, and the bioavailability is low.

The application discloses an automatic vagina closing and cutting instrument under a laparoscope and belongs to the technical field of medical instruments. The instrument comprises an operation handle, a sleeve, a clamping assembly, a cutting assembly, a rotating sleeve, a liquid storage sleeve, an adapter assembly, a protective sleeve and a sealing assembly. The sleeve is fixed to the outer side of the output end of the operation handle. The clamping assembly is arranged on the inner side of one end of the sleeve. The cutting assembly is used for cutting the vagina. The rotating sleeve is arranged outside the sleeve. The liquid storage sleeve is arranged on one end of the rotating sleeve and is in sliding connection with the sleeve. The adapter assembly is arranged on the inner side end of the liquid storage sleeve. One end of the protective sleeve is fixedly connected with the end of the liquid storage sleeve, which is far away from the operation handle. The fitting assembly is used for increasing the fitting property of the protective sleeve and the residual end of the vagina. The sealing assembly is arranged in the opening end of the protective sleeve. The movable protective sleeve is arranged outside the sleeve. The protective sleeve is tightly fitted with the residual end of the vagina through the fitting assembly. The risk that tumor cells enter the abdominal cavity through the open vagina is effectively blocked. The probability of abdominal cavity implantation and metastasis in the malignant tumor operation is remarkably reduced.

This invention relates to the field of daylily cultivation technology, specifically to a method for cultivating daylilies resistant to leaf rust. The invention provides a method for cultivating daylilies resistant to leaf rust, comprising the following steps: Seed treatment: After sterilization, daylily seeds are soaked in a seed treatment agent and then placed at a constant temperature of 35-37℃ for 6-8 days to obtain germinated daylily seeds; Seedling management: The germinated daylily seeds are sown in a seedling substrate and cultivated until germination, obtaining daylily seedlings; Transplanting: The daylily seedlings are transplanted into soil treated with a soil treatment agent. This invention's cultivation method can improve the resistance of daylilies to leaf rust.

The application discloses an electrolyte composition, a lithium ion battery and a preparation method thereof. The electrolyte composition combines the advantages of liquid and gel electrolytes, remains in a liquid state in a normal working temperature range (-20-60 DEG C) of a lithium ion battery cell, and can quickly gel to block direct contact between active materials and electrolyte and absorb a large amount of heat when facing a thermal runaway risk, thereby adding a barrier to the safety performance of the cell. The preparation method is simple, facilitates large-scale production, and can improve production efficiency.

This application relates to the field of hot-air expansion part forming and manufacturing technology, and particularly to a method for preparing highly corrosion-resistant hot-air expansion parts. The method includes: hot-air expanding non-zinc-based coated hot-formed steel to obtain a heat-treated substrate; quenching the heat-treated substrate to obtain a quenched hot-air expansion part; hot-dip coating the quenched hot-air expansion part with a zinc-based coating using a zinc-containing plating solution to obtain a hot-air expansion part containing a zinc-based coating; wherein the hot-dip coating temperature is proportional to the thickness of the quenched hot-air expansion part; and heat-treating the hot-air expansion part containing the zinc-based coating to obtain a zinc-based coated hot-air expansion part. This preparation method, through full-process control of "substrate pretreatment → precise hot-dip coating → coating structure optimization," synergistically optimizes the formation quality, structural stability, and bonding performance with the substrate of the zinc-based coating, improving the corrosion resistance of the hot-air expansion part from three dimensions: physical barrier, sacrificial anode protection, and structural reinforcement.

This application provides an anode material for solid-state batteries, a method for preparing the same, and a solid-state battery, relating to the field of solid-state batteries. The anode material includes secondary particles, which are spherical in shape and formed by stacking multiple primary particles. The primary particles include graphite and a coating layer distributed on at least a portion of the graphite surface. The coating layer is made of at least one of titanium dioxide, alumina, lithium niobate, lithium zirconate, lithium fluoride, silicon, and tin. The anode material of this application, comprising graphite and a coating layer on the graphite surface, effectively physically isolates the graphite from the contact with the sulfide solid electrolyte, significantly suppressing side reactions at the interface and effectively improving the first-cycle coulombic efficiency and cycle stability of the anode material.

The application provides a battery monomer, a battery device, an energy storage device, an energy storage system, a power consumption device and a charging network. The battery monomer comprises: a shell having a containing cavity; an electrode assembly arranged in the containing cavity; and a support arranged in the containing cavity, wherein the support and the electrode assembly are distributed along a first direction, and the support is located between the electrode assembly and the shell; wherein along the first direction, the thickness dimension of the support is a, the height dimension of the shell is h, and the thickness dimension a of the support and the height dimension h of the shell satisfy: 4x10 ‑4 ≤a / h≤30x10 ‑4 The application can effectively balance the battery capacity and the heat dissipation requirement, and guarantee the cycle life of the battery.

The application discloses a deep coal seam resistance-dust suppression integrated eutectic base material and a preparation method thereof, which comprises components A and B; the component A is composed of a hydrogen bond donor and a hydrogen bond acceptor, and the molar ratio of the two is (1.5-2.5):1; the component B is composed of an antioxidant, a thickening agent and a surfactant, and the mass ratio of the three is 1:(1-6):(1-4); and the mass ratio of the components A and B is (15-25):1. Under the joint action of the above material, the material prepared by the application not only has the ability of inhibiting spontaneous combustion and dust suppression, forms a resistance-dust suppression integrated technology, does not affect the quality of raw coal, reduces the working procedure in the mine, and improves the systematicness and economy of disaster prevention and control.

The invention provides a preparation method of a porous carbon-loaded zinc and carbonization-coated zinc negative electrode material and a preparation method of a nickel-zinc battery, and the preparation method of the porous carbon-loaded zinc and carbonization-coated zinc negative electrode material comprises the following steps: soaking hollow porous carbon skeleton particles in a zinc plating electrolyte for electrochemical deposition, obtaining galvanized porous carbon particles; baking the galvanized porous carbon particles, adding a phenolic resin solution and a curing agent after baking, and stirring to obtain a phenolic resin galvanized precursor; the phenolic resin zinc plating precursor is introduced into a protective atmosphere for heating and carbonization, and a carbon-coated material is obtained; and adding a silane coupling agent into the carbon-coated material, and drying to obtain the zinc negative electrode material. Zinc is deposited on a hollow porous carbon skeleton, so that the electrochemical performance is improved, and zinc dendrites are prevented; phenolic resin is carbonized and coated with a carbon layer, so that electrolyte is blocked, and side reaction is reduced; the silane coupling agent improves the interface bonding force and improves the interface compatibility between the zinc negative electrode material and the negative electrode binder.

The present application belongs to the technical field of tunnel and underground engineering waterproof and drainage, and particularly relates to a large-section data center cave double-layer waterproof board laying method, comprising: base surface treatment; partitioned drainage system layout, divided into vault high seepage area, hance moderate seepage area, short side wall and inverted arch water collection and sedimentation area according to cave section curvature and water inflow, each partition is configured with a drainage blind pipe with different pipe diameters and is wrapped and protected with a graded geotextile, a standard tee joint is used in the hance area, and a variable-diameter tee joint is used in the short side wall and inverted arch area to increase the confluence area; cushion layer laying; first layer EVA waterproof board construction; second layer self-adhesive HDPE self-adhesive adhesive film waterproof board construction, and the two layers of waterproof boards are staggered and laid. The present application solves the problems of local water accumulation high pressure, pipe blockage and waterproof board bulging and delamination caused by the existing drainage system with unified pipeline for the whole cave through the synergistic effect of the partitioned self-adaptive drainage system and the double-layer waterproof barrier, and greatly improves the reliability and durability of the waterproof system.

This invention discloses a conductive network coating modified high-nickel ternary cathode material and its preparation method, belonging to the technical field of modified ternary materials. It comprises: a high-nickel ternary cathode material, an inner coating, and an outer coating; the chemical formula of the high-nickel ternary cathode material is LiNi. x Co y Mn 1‑x‑y O2, x=0.8~0.9, y=0.05~0.15; the inner coating is a lithium titanate coating, which coats the surface of the high-nickel ternary cathode material; the outer coating is a conductive polymer-conductive carbon composite coating, which coats the surface of the inner coating; the conductive polymer-conductive carbon composite coating consists of poly(3,4-ethylenedioxythiophene) and conductive carbon. The conductive network coating modified high-nickel ternary cathode material prepared by this invention has a high discharge specific capacity and good cycle stability.

The invention provides a platinum nanoparticle antifouling oxidation reduction metal electrode based on MOF material modification and a preparation method and application thereof, and belongs to the technical field of marine pollution detection. The preparation method comprises the following steps: carrying out electrodeposition on a platinum-based electrode by using K2PtCl4 and CTAB to form a platinum nanoparticle substrate, then mixing BDC-F4 and ZrO (NO3) 22H2O by using a hydrothermal reaction to form a UiO-66-F4 MOF material, and finally putting the electrode into a solution to obtain Pt NPs at UiO-66-F4. The prepared electrode can inhibit adhesion of organic macromolecules in seawater, and has excellent stability.

The invention provides an organic-inorganic composite lithium supplement agent and a preparation method thereof, and relates to the technical field of lithium batteries. The organic-inorganic composite lithium supplement agent comprises an inorganic lithium supplement agent and an organic lithium supplement agent; wherein the organic lithium supplement agent is coated on the surface of the inorganic lithium supplement agent to form a coating layer. According to the structure, water and oxygen are effectively isolated through the organic coating layer, and the problem that inorganic materials easily absorb water and lose efficacy is solved; and meanwhile, the inorganic core is used for providing electric conduction and catalytic action, so that the reaction kinetics and lithium supplement efficiency of the organic material are improved. And an organic decomposition product can form a film in situ, and an electrolyte side reaction caused by inorganic residues is inhibited, so that high stability and high electrochemical performance are both considered.

This invention discloses a symbiotic lithium-ion sieve membrane, its preparation method, and its application in seawater lithium extraction. The symbiotic lithium-ion sieve membrane comprises an inorganic lithium-ion sieve membrane and a symbiotic structural layer grown on its surface. The symbiotic structural layer includes a protective layer and a lattice-matched interface phase formed between the protective layer and the inorganic lithium-ion sieve membrane. This interface phase is formed by the protective layer's main material penetrating into the inorganic lithium-ion sieve membrane and then being reconstructed. The preparation method involves spin-coating a symbiotic structural layer precursor sol onto the polished surface of the inorganic lithium-ion sieve membrane, followed by sintering to allow the precursor material to penetrate and grow. This spin-coating-sintering process is repeated until a completely covering symbiotic structural layer is formed. The symbiotic lithium-ion sieve membrane prepared by this invention maintains continuous Li... + While providing a transmission channel, it can effectively block the chemical corrosion of inorganic lithium-ion screen membranes by seawater, greatly improving their operational stability and making them stable for use in the lithium extraction process from seawater or brine.

The application provides a preparation method of a lithium manganese iron phosphate positive electrode material and the lithium manganese iron phosphate positive electrode material. The preparation method comprises the following steps: mixing a lithium manganese iron phosphate precursor and a COF-5 covalent organic framework material to obtain a first mixture, the COF-5 covalent organic framework material has a porous hole structure and contains carbon elements and active functional groups; and performing first sintering on the first mixture, so that the lithium manganese iron phosphate precursor is converted into a lithium manganese iron phosphate matrix, the COF-5 covalent organic framework material is carbonized to form a porous carbon coating layer, and thus the lithium manganese iron phosphate positive electrode material is obtained. The positive electrode material obtained by the preparation method has a uniform surface coated with a porous carbon layer formed by carbonization of COF-5, the coating layer retains an ordered porous structure, can improve the electronic conductivity and lithium ion diffusion capacity of the material, inhibits manganese dissolution and interface side reactions in high-temperature cycles, and improves particle dispersity and particle size consistency.

This utility model discloses a stable pole-mounted circuit breaker, which includes a mounting plate and a pole-mounted circuit breaker body. The pole-mounted circuit breaker body has mounting portions on both sides. The mounting plate has a first recessed cavity with an opening to accommodate the mounting portions, and a second recessed cavity corresponding to the first recessed cavity is provided on the back of the mounting plate. Pressure plates are inserted into the first and second recessed cavities, with one pressure plate abutting against the mounting portion. The pressure plates are configured as an integrated structure. The pressure plates abut against the sidewalls of the recesses to reduce the lateral swaying of the pole-mounted circuit breaker body. A grooved locking fastening assembly and a second protective assembly using spring force improve connection reliability and pre-tightening force. Simultaneously, the first and second protective assemblies block humid air, water vapor, and rainwater, preventing corrosion and rust of the fastening components, ensuring their strength and fastening performance, reducing the risk of loosening, and improving the product's protective performance.

This invention relates to a C x N y This invention relates to a Pt@C fuel cell catalyst and its preparation method, belonging to the field of fuel cell catalyst technology. First, Pt@C is synthesized via a solvothermal reaction using ethylene glycol reduction. Then, it is mixed with a nitrogen-containing polymer material and cobalt chloride hexahydrate, and subjected to reduction in a reducing atmosphere, high-temperature treatment, carbon pyrolysis, and alloying to obtain porous nitrogen-containing carbon-coated Pt@C. x N y @PtCo / C catalyst. In the prepared catalyst, the porous coating layer significantly reduces the poisoning of catalyst particles by resin during fuel cell operation, improves cell activity, and extends cell life, exhibiting excellent activity and durability.

The application discloses a top cover structure and a battery. The top cover structure comprises a top cover sheet, an explosion-proof valve and a plastic part. The top cover sheet is provided with an explosion-proof hole. The explosion-proof valve is connected with the top cover sheet and covers the explosion-proof hole. The plastic part is provided with a first exhaust port penetrating through the plastic part. The projection of the first exhaust port on the axis direction of the explosion-proof hole is located on the outside of the explosion-proof valve. Compared with the prior art, the first exhaust port of the application is offset from the explosion-proof valve. The droplets of the electrolyte fall on the top cover sheet under the action of gravity and cannot contact the surface of the explosion-proof valve. By changing the position of the first exhaust port on the plastic part, a physical isolation barrier is formed on the basis of maintaining the original exhaust function. The direct contact between the electrolyte and the explosion-proof valve is effectively blocked, the oxidation corrosion of the explosion-proof valve is prevented, and the normal opening function of the explosion-proof valve in thermal runaway is ensured.

The application discloses a blue vitriol oral colon release preparation, a preparation method and application thereof, and belongs to the technical field of medicines, and comprises a blue vitriol granule core, an isolation layer and a colon positioning coating layer; the isolation layer is completely coated on the surface of the blue vitriol granule core; the colon positioning coating layer is coated on the surface of the isolation layer; and the administration mode of the preparation is: releasing through oral administration directly to the colon. The application adopts the above-mentioned blue vitriol oral colon release preparation, the preparation method and application thereof, and solves key problems such as coating defects, drug degradation and insufficient release precision in the colon target delivery of the blue vitriol through a trinity technical scheme of a complete isolation layer, critical colon coating weight increase and a fluidized bed bottom spraying process, so that the active ingredients of the blue vitriol can act on the lesion site in the colon environment in an integrated chemical form and with sufficient dosage, and high-efficiency, safe and stable ulcerative colitis treatment effects are achieved.