1165 results about "Inorganic particles" patented technology

The invention relates to the technical field of batteries, in particular to a battery. Comprising a positive plate and electrolyte, the positive plate comprises a positive current collector and a coating positioned on the surface edge of at least one side of the positive current collector along the length direction; the coating comprises filling particles, and the filling particles comprise at least one of inorganic particles and nitrogen-containing particles; the electrolyte comprises non-fluorinated cyclic carbonate and fluorinated ethyl acetate; the non-fluorinated cyclic carbonate comprises propylene carbonate and optional ethylene carbonate; on the basis of the total mass of the electrolyte, the content ratio C1 of the non-fluorinated cyclic carbonate is smaller than or equal to 25%, the content ratio C11 of the propylene carbonate is 3.1%-24.9%, the content ratio C12 of the ethylene carbonate is 0%-5%, and the content ratio C2 of the fluorinated ethyl acetate is 20.2%-70%. The battery provided by the invention can improve the problem of lithium precipitation under low-temperature discharge, and has relatively good short-circuit safety performance and relatively low high-temperature gas production rate.

The invention relates to the technical field of refrigeration material preparation, in particular to an efficient passive radiation refrigeration material suitable for a sub-super environment and a preparation method and application of the efficient passive radiation refrigeration material. The method comprises the following steps: uniformly mixing thermoplastic polyurethane, sunlight high-reflection inorganic particles and a phase change material in a solvent; after a chemical foaming agent is added, the obtained suspension liquid is heated and foamed in a confinement mold, and wet gel is formed; and finally, carrying out freeze drying treatment to obtain the composite porous aerogel. The prepared material has a micro-nano porous skeleton formed by TPU, and inorganic particles and PCM are uniformly dispersed in the skeleton wall. Through component cooperation and a special porous structure, the material has extremely high sunlight reflectivity and mid-infrared emissivity, self-adaptive temperature regulation and control are achieved through PCM phase change, the problem that refrigeration of a traditional material fails in the sub-environment such as the vertical surface is effectively solved, and efficient sub-super-environment heat management is achieved.

The invention discloses a silane cross-linked polyolefin halogen-free flame-retardant cable material and a low-energy-consumption preparation method thereof.The preparation method comprises the steps that EVA / EEA serves as a matrix, silane groups are covalently connected to a polyolefin molecular chain through a free radical grafting reaction, and a grafting material containing an active silane side group is prepared; meanwhile, vinyl isocyanate is adopted to chemically modify hydroxyl on the surface of magnesium hydroxide, vinyl is grafted to the surfaces of particles, the polarity of the particles is reduced, and the dispersity of the particles is enhanced; then carrying out melt blending on the grafted material and modified magnesium hydroxide, constructing an interface bridge by using an anhydride group, and shortening the two-phase distance; finally, through room-temperature natural cross-linking and warm water auxiliary cross-linking, silane groups are promoted to be hydrolyzed into silanol, the silanol is condensed to form a-Si-O-Si-three-dimensional network, meanwhile, vinyl on the surface of magnesium hydroxide and a polyolefin matrix are subjected to free radical copolymerization, and a covalent bond interface layer is formed between inorganic particles and an organic matrix. According to the method, the synergistic improvement of high crosslinking degree, strong stretchability and excellent flame retardance of the cable material is realized through molecular-level interface regulation and cross-linking network optimization.

The embodiment of the invention provides an anti-dazzle low-reflection optical film and a preparation method and application thereof, and relates to the field of optical films. The anti-dazzle low-reflection optical film comprises a base material layer, an anti-dazzle layer and a low-reflection layer which are sequentially stacked from bottom to top, the low-reflection layer contains low-reflection particles, and the anti-dazzle layer contains organic anti-dazzle particles and inorganic particles. The mass concentration of the organic anti-dazzle particles close to the base material layer is larger than the mass concentration of the organic anti-dazzle particles close to the low-reflection layer, the mass concentration of the inorganic particles close to the base material layer is smaller than the mass concentration of the inorganic particles close to the low-reflection layer, and the refractive index of the low-reflection particles is larger than the refractive index of the inorganic particles and smaller than the refractive index of the organic anti-dazzle particles. Seen from the direction from the low-reflection layer to the base material layer, the refractive indexes of all the layers are gradually increased. According to the anti-dazzle low-reflection optical film and the preparation method and application thereof, the optical film achieves high haze and low reflectivity and can be applied to a strong light environment.

The invention discloses a composite insulating arm surface repairing material and a repairing method, and the repairing material comprises the following raw material components in parts by weight: 100 parts of matrix resin, 0.8-4 parts of a curing agent, 0.2-1.2 parts of an accelerant, 5-20 parts of color paste, 10-25 parts of inorganic particles, and 10-25 parts of inorganic fibers. The repairing material is simple in preparation method and convenient to use, according to the repairing method, the repairing material is used for replacing gel coat spraying repairing, the operation difficulty is low, the repairing duration is shortened, the repairing efficiency is improved, and all technical indexes of the repaired insulating arm component can meet the use requirements.

The invention discloses a high-resilience eTPU foaming material and a preparation process thereof, and belongs to the technical field of foaming materials. The process comprises the steps of raw material premixing and TPU chain extension reaction, precursor system injection, in-situ phase change energy storage core-shell particle generation, supercritical two-fluid foaming and molding post-treatment. Wherein the SiO2-coated TiO2 core-shell particles are prepared by a non-hydrolytic sol-gel method, the porous SiO2 core adsorbs and fixes the micro-crosslinked polyurethane-based phase change material, the TiO2 shell provides sealing and supporting, the particles are combined with the TPU matrix through covalent bonds, and the micro-crosslinked polyurethane-based phase change material has a unique micro-crosslinked network structure, so that the thermal conductivity of the TPU matrix is improved, and the thermal conductivity of the TPU matrix is improved. The hidden danger of leakage of the phase change material in the using process can be effectively eliminated, and meanwhile the interface bonding effect between the inorganic particles and the TPU matrix is synchronously enhanced. The eTPU foaming material prepared by the invention has the characteristics of high resilience, strong interface bonding, excellent energy storage stability and low compression set, and is suitable for shoe materials, automotive interiors and other scenes.

A photopolymerizable compound (A) and inorganic particles (B), and exhibiting good curability in a case that an initiator is added; a photosensitive composition including a photopolymerizable compound (A), inorganic particles (B), and an initiator (C), and exhibiting good curability; and a cured product of the photosensitive composition are provided. A compound having a specific structure including a radically polymerizable group-containing group is used as a photopolymerizable compound (A) in a composition including the photopolymerizable compound (A) and metal oxide particles (B), or a photosensitive composition including the photopolymerizable compound (A), metal oxide particles (B), and an initiator.

The invention relates to the field of food packaging and coatings, and provides a bio-based fluoride-free environment-friendly oil-proof agent for food packaging paper and paperboards, which is simple in preparation process, green and environment-friendly and has the bio-based raw material proportion of 70% or above. The bio-based fluoride-free environment-friendly oil-proof agent is characterized in that the bio-based fluoride-free environment-friendly oil-proof agent is prepared by synergistic micro-nanocrystallization of paper pulp fibers, starch and inorganic particles under the action of high-speed shearing and grinding; the prepared oil-proof agent can be coated on the surfaces of sized or unsized paper, paperboards and paper pulp molded products by a conventional coating method, the coated finished product has good oil-proof performance, the coating weight is 1.5-15g / m < 2 >, and the oil-proof grade tested by a Kit method after drying can reach 12 grade to the maximum. Compared with a fluoride-free oil-proof agent on the market at present, the bio-based fluoride-free environment-friendly oil-proof agent disclosed by the invention can obtain good oil-proof performance under a relatively low coating weight, is biodegradable and is easy to recycle and reuse.

A printed wiring board includes a first conductor layer, a resin insulating layer having an opening, a second conductor layer including a seed layer and an electrolytic plating layer formed on the seed layer, and a via conductor including the seed and electrolytic plating layers and connecting the first and second conductor layers. The seed layer has a first portion on the surface of the insulating layer, a second portion on an inner wall surface in the opening of the insulating layer, and a third portion on a portion of the first conductor layer exposed by the opening of the insulating layer such that the first portion is thicker than the second and third portions, and the insulating layer includes resin and inorganic particles including first particles forming the inner wall surface and second particles embedded in the insulating layer and having shapes different from shapes of the first particles.

The present invention provides a lightweight and thin thermal insulating / flame barrier sheet that is used between cells within a battery pack where battery cells are connected and stacked in series or parallel. This thermal insulating / flame barrier sheet has a thickness of 3 mm or less, and is obtained by papermaking process using a suspension containing 25 to 70% by weight of a silica-based inorganic fiber having a hydroxyl group; 2 to 25% by weight of a glass fiber; 5 to 40% by weight of a fibrous mineral; 3 to 20% by weight of a binder; and 0 to 45% by weight of a thermal insulating inorganic particle. The thermal insulating inorganic particle includes a hydrophilized aerogel particle obtained by treating the surfaces of hydrophobic aerogel particle having a porosity of 80% or more and an average particle size of 5 to 200 μm, with a hydrophilizing agent.

The invention belongs to the technical field of high polymer materials, and particularly relates to a PET decorative film and a preparation method thereof. The preparation method comprises the following steps: synthesizing hydroxyl-terminated hyperbranched polyester by taking pentaerythritol and 2, 2-dimethylolpropionic acid as raw materials, and reacting with polyol glycidyl ether to prepare an epoxy-terminated organic modifier; silver-loaded nano silicon dioxide subjected to surface treatment by an amino silane coupling agent is used as inorganic functional particles; pET resin, an organic modifier and inorganic functional particles are subjected to melt blending and extrusion granulation, and modified PET is prepared; the modified PET is prepared into the film through a two-way stretching process. Epoxy groups of the organic modifier chemically react with amino groups at the tail end of a PET molecular chain and on the surfaces of inorganic particles respectively, a stable organic-inorganic hybrid network is constructed, synergistic improvement of reinforcement, toughening and long-acting antibiosis is achieved, and the technical problems that functional particles are not uniform in dispersion, interface bonding is weak, and antibacterial components are prone to migration are effectively solved.

The invention provides a hot-pressing preparation method and application of a magnetic powder core. The hot-pressing preparation method comprises the following steps: carrying out insulation coating on glassy state soft magnetic amorphous alloy powder to obtain an intermediate powder material with a coating structure; the coating structure comprises a first coating layer or comprises a first coating layer and a second coating layer which are arranged in sequence; the first coating layer comprises nano inorganic particles and phosphate, and the second coating layer comprises an organic coating material; carrying out hot pressing treatment on the material containing the intermediate powder material to obtain a magnetic powder core; the adopted glassy soft magnetic amorphous alloy powder has a supercooled liquid phase region, the lowest temperature and the highest temperature of the supercooled liquid phase region are Tg and Tx respectively, the temperature of the hot pressing treatment is (Tg-20 DEG C)-(Tx-20 DEG C), the pressure of the hot pressing treatment is 100-500 MPa, and the holding time is 2 s-120 min. According to the magnetic powder core provided by the invention, the coating layer can be kept complete in the hot pressing process, and the magnetic powder core has relatively high density, high resistivity, high magnetic conductivity and low loss.

The disclosure provides compositions, methods of treatment, and methods of making and using compositions to deliver a nucleic acid to a subject. Compositions described herein include lipid carriers, optionally including an inorganic particle, capable of admixing with nucleic acids. Nucleic acids provided herein include those encoding for cancer antigens (full length proteins or fragments) as well as antibodies. Methods of using the compositions as a therapeutic vaccine for the treatment of a cancer are also provided.

The invention discloses an environment-friendly halogen-free flame-retardant composite special cable, and belongs to the technical field of cable preparation, the special cable sequentially comprises a conductor, an insulating layer, a glass fiber rope layer and an outer protective sleeve from inside to outside, and the insulating layer and the outer protective sleeve are prepared from a modified flame-retardant copolymer. The modified flame-retardant copolymer is prepared from the following raw materials in parts by weight: 65 to 80 parts of linear low-density polyethylene, 20 to 38 parts of ethylene-vinyl acetate copolymer, 5 to 10 parts of modified P-N-Si flame retardant 1, 3 to 6 parts of modified P-N-Si flame retardant 2, 0.5 to 1 part of initiator, 0.2 to 0.5 part of antioxidant and 25 to 35 parts of non-reactive flame retardant through melt copolymerization; a polyfunctional and rigid organic modified P-N-Si flame retardant is grafted, so that the migration of the flame retardant is reduced, the crosslinking degree is increased, and the mechanical and high-temperature-resistant properties are improved; the organic P-N-Si, the inorganic non-reactive flame retardant metal hydroxide and the nano inorganic particles have a synergistic effect, so that the cable is endowed with high flame retardance.

A plasma cutting protection liquid, and a preparation method therefor, and a use thereof. The plasma cutting protection liquid comprises, in parts by mass: 8 to 40 parts of a water-soluble resin, 1 to 10 parts of a cosolvent, 0.1 to 8 parts of nanoscale inorganic particles, 0.5 to 3 parts of a flow promoter, 0.1 to 0.5 parts of an ultraviolet light absorber, and 50 to 100 parts of a solvent, wherein the water-soluble resin contains amide groups, and the water-soluble resin is a partially cross-linked resin. By using the partially cross-linked resin containing the amide groups, the partially cross-linked structure can form a three-dimensional network structure to inhibit molecular movement so as to improve the high-temperature resistance. The resin contains a large number of hydrophilic amide groups, which extremely easily form hydrogen bonds with water. After a cutting process is completed, a film layer formed by the protection liquid can be easily removed, and the cleaning process is simple. The inorganic particles can further improve the heat-resistant temperature of the cutting protection liquid and can also improve the compactness of the film layer, thereby facilitating the formation of a uniform film layer.

The invention belongs to the field of lithium batteries, and particularly relates to a battery roll core which comprises a positive plate, a diaphragm and a negative plate which are stacked and wound, the positive plate comprises a first bending section, the negative plate comprises a second bending section, and the diaphragm comprises a third bending section; gummed paper is adhered to at least one of the first bending section, the second bending section and the third bending section, the gummed paper comprises a gummed paper base material and a gummed paper adhesive layer arranged on the surface of the gummed paper base material, and the gummed paper adhesive layer contains inorganic particles; the battery roll core meets the following relational expression: 0.0875 T + 1.75 F-0. 075 is greater than or equal to R; wherein T is the thickness of the gummed paper layer; f is the mass content of inorganic particles in the gummed paper layer; r is the ratio of the thickness of the positive plate to the thickness of the negative plate. The problems of powder falling, breakage, short circuit and the like at the bending part of the inner ring of the roll core of the high-energy-density lithium ion battery can be effectively solved, and the service life of the lithium ion battery is prolonged.

The invention relates to the technical field of organic high-molecular compound synthesis, in particular to a modified ABS material diffusion plate and a preparation method thereof.The preparation method comprises the steps that dried ABS resin and acrylonitrile-butadiene-styrene copolymer are mixed to prepare a modified ABS base material; mixing organic silicon microspheres and nano barium sulfate to obtain a modified light diffusion agent; judging that the modified light diffusant is unqualified by comparing the refractive index absolute difference between the modified light diffusant and the modified ABS base material, and performing modification compensation; a titanate coupling agent is determined to be adopted for modification according to the content of inorganic particles of the modified light diffusion agent; mixing the modified light diffusant with an antioxidant system, an ultraviolet protective agent and a processing aid to obtain a functional additive; and mixing with a modified ABS (Acrylonitrile Butadiene Styrene) base material, and extruding by using a twin-screw extruder to Through multi-parameter feedback and accurate compensation control, the problems that the compatibility of the modified light diffusion agent and the base material is poor and the stability of the machining process is insufficient are effectively solved.

According to an aspect of the present invention, there is provided a method for manufacturing a secondary battery, the method including: preparing an electrode assembly in which electrodes and a separator are alternately laminated, and an adhesive is applied to the surface of at least one among the electrodes and the separator, thereby allowing the electrodes and the separator to adhere to each other; accommodating the electrode assembly in a battery case; injecting a gel polymer electrolyte composition into the battery case to impregnate the electrode assembly with the gel polymer electrolyte composition; and curing the gel polymer electrolyte composition, wherein the adhesive includes a first oligomer compound, the separator includes a porous substrate and ceramic coating layers disposed on both surfaces of the porous substrate, the ceramic coating layers include 92-100 wt % (exclusive of 100) of inorganic particles and 0-8 wt % (exclusive of 0) of a binder, and the gel polymer electrolyte composition includes a lithium salt, an organic solvent, a polymerization initiator, and a second oligomer compound.

A positive electrode current collector and a preparation method therefor, a positive electrode sheet and a preparation method therefor, and a battery are provided. The positive electrode current collector includes a foil and a protective layer provided on a surface of the foil. The protective layer includes inorganic particles. The ratio of a thickness of the protective layer to a thickness of the foil is 0.05-0.7. In the present disclosure, by controlling the thickness of the protective layer containing inorganic particles, the ratio of the thickness of the protective layer to the thickness of the foil is ensured, thereby obtaining a current collector having an ultra-thin protective layer.

The invention relates to the technical field of solid-state batteries, and particularly discloses an inorganic-organic composite solid-state electrolyte, a membrane material thereof, a preparation method and a solid-state battery. The electrolyte comprises a polymer matrix, inorganic solid electrolyte particles, a surface modifier, a cross-linking agent and a heat conduction enhancer. The preparation method of the membrane material comprises the following steps: inorganic particle surface modification treatment; compounding the slurry; gradient curing; and forming the film. The obtained membrane is high in ionic conductivity, low in interface impedance and high in thermal decomposition temperature. And the assembled total battery is high in capacity retention rate after being circulated for 500 times at 0.5 C, and a hot box test is qualified. According to the technology, the core problem of poor interface compatibility of the solid-state battery is solved, and meanwhile, the thermal runaway risk of the solid-state battery is reduced.

Provided is a photocurable resin composition comprising components (A) to (D), wherein the content of each of the components is within a specific range.　Component (A) is a polymer which has a number-average molecular weight of 1,000-100,000 and which has a polyisobutylene skeleton and two or more (meth)acryloyl groups. Component (B) is a monofunctional (meth)acrylate compound which has a C4-18 linear or branched hydrocarbon group and which has one (meth)acryloyl group per molecule. Component (C) is inorganic particles which have an average particle size of 0.1-200 μm and the surfaces of which are modified by an organic group. Component (D) is a photoradical polymerization initiator.

The application provides a composite electrode active layer, an electrode sheet and a secondary battery. The composite electrode active layer comprises an active material layer and a composite insulation layer which are stacked in sequence, the composite insulation layer comprises inorganic particles, a heat-resistant polymer and a heat-sensitive polymer; the weight ratio of the inorganic particles, the heat-resistant polymer and the heat-sensitive polymer is (50-100):(1-10):(5-50); the melting temperature of the heat-resistant polymer is 180-450 DEG C; and the softening temperature of the heat-sensitive polymer is 80-120 DEG C. Through the design of the composite electrode active layer, the application realizes the low closed pore temperature and the high film breaking temperature, and further realizes the porous structure and the high-temperature resistance.

The invention provides a silicon wafer polishing solution, a silicon wafer polishing method thereof, a silicon wafer and a solar cell. The silicon wafer polishing solution comprises first inorganic particles, second inorganic particles, ammonium persulfate, sophorolipid and a solvent, the particle size of the first inorganic particles is smaller than that of the second inorganic particles, and the silicon wafer polishing solution is alkaline. Therefore, the silicon wafer can be polished in a mode of simultaneously carrying out chemical etching and mechanical grinding on the silicon wafer, the concave-convex height difference of line marks on the surface of the silicon wafer can be effectively reduced, even no obvious line marks penetrating through the silicon wafer exist, and then the surface flatness of the silicon wafer is improved; when a silicon wafer polished by the polishing solution is used for a perovskite / crystalline silicon laminated cell, the deposition quality of a thin film in the perovskite top cell can be effectively improved, and the overall efficiency of the cell is further improved.

The invention relates to the technical field of cable materials, and provides an ultraviolet curing polyethylene cable material with high insulating property and a preparation process thereof. The polyethylene cable material is prepared from the following raw materials in parts by weight: 50 to 80 parts of first low-density polyethylene, 2 to 10 parts of second low-density polyethylene, 10 to 20 parts of high-density polyethylene, 5 to 15 parts of phytic acid-nano-TiO2 modified lignin, 1 to 4 parts of modified inorganic particle composite material, 1 to 4 parts of polyolefin elastomer, 0.5 to 1.5 parts of cross-linking agent, 0.5 to 1.5 parts of initiator and 0.2 to 0.8 part of antioxidant. The polyethylene cable material disclosed by the invention has the advantages of excellent mechanical property, aging resistance, insulating property and flame retardant property, high safety and long service life.

The invention relates to the technical field of papermaking, and particularly provides blue gray spunlace non-woven fabric base paper and a production process thereof. The raw paper comprises the following components in parts by weight: 90-120 parts of a fiber raw material, 1.5-2.6 parts of a coloring system, 6.5-13 parts of a color fixing system, 3.5-6 parts of a hydrophobic modification system and 0.5-2 parts of an auxiliary agent system. According to the invention, the mesoporous inorganic particles and bentonite in the coloring system are used for synergistically bearing the blue-grey composite dye, so that dye agglomeration is inhibited and nanoscale uniform dispersion is realized; acrylamide in the color fixing system is polymerized to form a physical network structure to construct a chemical color locking layer, so that the dye is doubly locked; in a hydrophobic modification system, liquid paraffin and stearic acid are self-assembled on the surface of the fiber to form a hydrophobic membrane, so that water dyeing is effectively prevented; all the functional components are stably distributed in the slurry and participate in curing and film forming, and the raw paper is endowed with excellent performance such as high color fastness and low decolorization rate through overall synergy.

An electrophotographic photosensitive member includes a conductive substrate, an intermediate layer provided on the conductive substrate, and a photosensitive layer provided on the intermediate layer. The intermediate layer contains a specific polyamide resin and specific inorganic particles. The specific inorganic particles each include a metal oxide particle and a surface treatment layer covering at least a part of the surface of the metal oxide particle. The surface treatment layers contain a component derived from an organic siloxane compound and at least one of aluminum oxide and silica. The specific polyamide resin includes a first repeating unit derived from an aliphatic dicarboxylic acid with a carbon number of at least 8 and no greater than 20 and a second repeating unit derived from a diamine compound with a cycloalkane structure.

The invention discloses a preparation process of coating slurry for a lithium ion battery diaphragm. Comprising the following steps: step 1, uniformly mixing polyether polyol, a modified additive, dibutyltin dilaurate, dimethylolpropionic acid and isophorone diisocyanate, under a protective atmosphere, raising the temperature to 80-90 DEG C, reacting for 3-4 hours, then adding 1, 4-butanediol, continuously reacting for 3-4 hours, after the reaction is finished, cooling to 40-50 DEG C, then adding triethylamine, stirring for 30-40 minutes, and then, carrying out heat preservation for 30-40 minutes, so as to obtain a polyurethane prepolymer; slowly adding deionized water to obtain a polyurethane adhesive; 2, inorganic particles, a polyurethane adhesive and a dispersing agent are mixed and stirred at the normal temperature for 10-12 h, and the coating slurry is obtained. The flame-retardant battery diaphragm has the beneficial effects that the flame-retardant unit and the modified additive of the quaternary ammonium salt group are introduced into a polyurethane adhesive system, so that the prepared battery diaphragm has excellent flame retardance, enhanced mechanical property and good electrolyte wettability.

The present application relates to a kind of through-hole type ultra-high molecular weight polyethylene fiber, its manufacturing method and its application.The manufacturing method of the through-hole type ultra-high molecular weight polyethylene fiber of the present application includes the following steps: 1) mix ultra-high molecular weight polyethylene, acid-soluble inorganic particles and solvent to prepare spinning solution, 2) extrude the spinning solution to form spinning stream, 3) remove at least a portion of the solvent from the spinning stream to obtain dry protofilament, 4) stretch the dry protofilament in two or more stages, and at the same time as the one or more stages of these stages are carried out, spray acid solution to the dry protofilament to dissolve the acid-soluble inorganic particles, obtain the through-hole type ultra-high molecular weight polyethylene fiber.The through-hole type ultra-high molecular weight polyethylene fiber of the present application can float on seawater and quickly absorb oil, solving the problem of fast diffusion and difficult collection of oil spill.

The invention discloses a passive radiation-cold storage composite box body and a preparation method. The box body sequentially comprises a composite radiation film, a heat insulation layer and a cold storage layer from outside to inside. The outer-layer radiation film is composed of an elastic organic matrix and high-reflection inorganic particles such as barium sulfate, has high solar reflectivity and mid-infrared high emissivity, and can effectively restrain solar absorption and achieve radiation heat dissipation in the daytime. The heat insulation layer is made of XPS, EPS, aerogel felt and other low-heat-conduction materials so as to reduce external heat transfer. Phase change microcapsules are dispersed in the cold storage layer, and flake graphite and other high-thermal-conductivity fillers can be added to improve the cold transfer efficiency and temperature uniformity. And the phase-change material realizes automatic cold storage and cold release through a latent heat mechanism, so that the temperature in the box body is kept stable. Through the synergistic effect of radiation refrigeration, heat insulation and phase change cold storage, long-time and recyclable passive cold chain temperature control is achieved, and the device has the advantages of being simple and convenient in structure, high in cost performance, flexible in application, uniform in internal temperature distribution and the like.

The invention relates to the technical field of lithium ion batteries, in particular to a lithium ion battery diaphragm and a preparation method thereof, and particularly relates to a composite diaphragm which has a special microcosmic coating structure and can remarkably improve the mechanical strength and thermal stability of the diaphragm. The composite diaphragm comprises a porous polymer base membrane and a coating arranged on at least one surface of the base membrane, the coating comprises inorganic particles and carbon nanotubes, and more than 95% of the carbon nanotubes in the coating exist in a single form; the single carbon nano tube and the inorganic particles are mutually staggered and entangled in a three-dimensional space to form a continuous three-dimensional network structure.