88results about How to "Reduce solubility" patented technology

A liquid crystal composition contains a side chain type polymer liquid crystalline compound which can form a light absorption anisotropic film having a high alignment degree and has excellent solubility in a general-purpose solvent, a light absorption anisotropic film obtained using the composition, a laminate, and an image display device. The composition includes: a side chain type polymer liquid crystalline compound; and a dichroic substance, in which the compound is a copolymer having a repeating unit (1) containing a mesogenic group with a molecular weight of greater than 280 and a repeating unit (2) with a molecular weight of 280 or less, a content of the repeating unit (2) is less than 14% by mass with respect to a total mass of the compound, and a content of the dichroic substance is greater than 2% by mass with respect to a total solid content of the composition.

The invention discloses a rare earth aluminum alloy cable material and a preparation method and application thereof, and relates to the technical field of aluminum alloy material preparation. The rare earth aluminum alloy cable material is prepared from the following raw material components in percentage by mass: 0.3 to 0.6 percent of Ce, 0.3 to 0.6 percent of Sc, 0.05 to 0.15 percent of Y, 0.10 to 0.20 percent of Fe, 0.05 to 0.15 percent of Si and the balance of Al. The preparation process comprises the steps of melting, refining, casting, homogenizing treatment, hot rolling, drawing and aging treatment. The rare earth elements Ce, Sc and Y are added, a specific heat treatment process and a processing process are combined, and the three rare earth elements Ce, Sc and Y have a synergistic effect, so that the performance and the electric conductivity of the cable material are balanced, and the cable material has good electric conductivity and elongation on the premise of ensuring certain tensile strength, and can meet the requirements of the cable industry.

This utility model discloses a debittering unit for jujube seed saponin extract, relating to the field of saponin treatment technology. It includes a base; a unit tank is positioned above the base along a left-right direction; the unit tank is connected to the base via a vibration assembly; two partition plates are fixedly fitted and interlocked from left to right inside the unit tank; each partition plate has a fixed outlet; a solenoid valve is installed on the outlet; the two partition plates divide the inside of the unit tank from left to right into a heating chamber, a neutralization chamber, and a cooling chamber; each of the three chambers has a sealable injection port connected to its upper side; a temperature-controlled heater is fixed inside the heating chamber; a temperature-controlled refrigerator is fixed inside the cooling chamber; and temperature sensors are fixed inside the heating and cooling chambers respectively. The advantages of this utility model are: it can realize the entire debittering process, reducing operational difficulty and saving costs.

The invention relates to the technical field of clinical detection of cerebrospinal fluid, and particularly discloses a smear device for detecting cerebrospinal fluid, which mainly comprises a sample tube and a piston assembly, the sample tube comprises a first tube body, a second tube body and a third tube body; the second pipe body is located above the first pipe body, a liquid outlet hole is formed in the bottom, and a liquid inlet hole is formed in the side wall; the bottom of the third pipe body is communicated with the liquid inlet hole through a flow channel; the piston assembly comprises a piston, a handle part and a center rod; the piston is fixedly connected with a tongue part, the center rod can be inserted into the liquid outlet hole, and the piston assembly is provided with an initial station and a flaking station. According to the smear device for detecting the cerebrospinal fluid, the manufacturing process of a cell smear is simplified, operation is convenient and fast, the smear manufacturing efficiency is remarkably improved, the smear manufacturing time is shortened, unnecessary physical damage to cells in the smear manufacturing process is avoided, then cell rupture and dissolution can be effectively reduced, and the smear quality is remarkably improved; meanwhile, the comprehensive cost of manufacturing the cell smear is obviously reduced.

The invention relates to the technical field of plant essential oil extraction, and discloses a valerian-rich rhizoma nardostachyos essential oil directional preparation process, which comprises: taking a functionalized compound solvent, adding rhizoma nardostachyos coarse powder according to a liquid-solid ratio, stirring and soaking to obtain a solid-liquid mixture; the solvent component comprises process water, sodium xylene sulfonate, dipotassium phosphate and polyethylene glycol 400; introducing steam into the mixture, heating to maintain slight boiling, carrying out first-stage distillation, and removing distilled low-boiling-point components to obtain resident in the kettle; cooling the resident to a constant temperature, adding sodium chloride, and stirring until the sodium chloride is dissolved to obtain a heterogeneous mixed system; the heating system is subjected to second-stage distillation, and distillate is collected; and carrying out oil-water separation on the distillate, and collecting an oil phase to obtain a finished product of the rhizoma nardostachyos essential oil. According to the method disclosed by the invention, a hydrotropy-salting-out phase change mechanism is matched with fractional distillation, so that high-efficiency desorption and directional enrichment of valerianone which is difficult to volatilize are realized while acidic and light component impurities are removed.

This invention relates to the field of zinc alloy surface modification technology, and particularly to a corrosion-resistant medical zinc alloy, its preparation method, and its applications. The preparation method includes the following steps: weighing raw materials according to the chemical composition of the zinc alloy; cleaning the surface of the raw materials; smelting, refining, and casting to obtain an ingot; subjecting the ingot to equal-channel angular extrusion deformation to obtain an extruded zinc alloy; performing high-energy ion implantation on the zinc alloy to obtain a nitrogen-ion-implanted zinc alloy; and preparing a coating on the surface of the nitrogen-ion-implanted zinc alloy to obtain the final product. This invention achieves a high-adhesion, dense, and uniform deposition effect on the alloy surface through the synergistic control of "equal-channel angular extrusion + high-energy nitrogen ion implantation + biomimetic coating deposition," solving the problem of severe galvanic corrosion at localized sites in existing zinc alloys under corrosive environments. Simultaneously, the dense deposition layer helps inhibit rapid dissolution of the zinc alloy surface, significantly reducing the corrosion rate of the zinc alloy in corrosive environments.

This invention discloses a refractory high-entropy alloy resistant to high-temperature molten aluminum corrosion and erosion-wear, its preparation method, and its applications. The refractory high-entropy alloy of this invention comprises, by atomic percentage: 40-50 at.% Nb, 35-40 at.% Ti, 4-10 at.% Mo, 4.5-5 at.% Cr, and no more than 10 at.% Al. This invention obtains the refractory high-entropy alloy by mixing and melting the raw materials under a protective atmosphere. The refractory high-entropy alloy ingot of this invention has a single-phase BCC microstructure, exhibiting stable structure, good mechanical properties, and excellent resistance to molten aluminum corrosion and erosion-wear. The Nb-Ti-Mo-Cr based refractory high-entropy alloy resistant to molten aluminum corrosion and erosion-wear prepared using this invention can significantly improve the service life of components, reduce replacement frequency, and has high economic benefits.

This invention provides an oscillating photobioreactor and its usage method, comprising a multi-stage photofermentation tube array spaced apart along the height direction, and a multi-stage support platform for supporting the photofermentation tube array. The multi-stage support platform is slidably mounted on a support frame and is connected to a cam drive device, the input end of which is connected to a drive device. Multiple photofermentation tubes are arranged in parallel at intervals within the multi-stage photofermentation tube array, and the photofermentation tubes in all multi-stage arrays are staggered. Light sources are located on the upper and lower sides of the multi-stage photofermentation tube array, on the support frame. This application uses multiple photofermentation tubes connected in parallel, with small units fermenting independently without mutual interference, thus avoiding large-scale contamination of the bacterial solution. This application uses physical oscillation to evenly distribute the bacterial solution, effectively reducing dissolved oxygen and dissolved hydrogen in the solution, simplifying subsequent hydrogen collection and separation, and enabling large-scale bio-hydrogen production.

The invention discloses an ion exchange washing alkaline water recycling system, and relates to the field of water treatment. The system comprises an anion exchanger, a washing alkaline water collection pipeline, an online monitoring unit, a shunting switching unit, a weak acid cation exchange treatment unit, an acid liquid regeneration unit, a pipeline conveying pump, a decarburization unit, an intermediate water tank, a recycling unit and a control unit. The online monitoring unit is arranged at the washing drainage end of the anion exchanger, the water quality of the washing alkaline water is detected in real time, and graded recovery of the washing alkaline water is achieved in combination with the shunt switching unit; the recycled washing alkaline water enters a weak acid cation exchange treatment unit to be subjected to ion exchange treatment so as to reduce the alkalinity of the water body; meanwhile, the weak-acid cation exchange resin is regenerated by utilizing acidic waste liquid generated by regeneration of the cation exchange bed, so that synergistic utilization of acid and alkali resources is realized; the treated water body sequentially passes through the decarburization unit and the middle water tank and then is reused for the pure water preparation system.

This invention discloses a slow-release fertilizer suitable for lateritic soils in Hainan, comprising a fertilizer core and a coating layer; the fertilizer core comprises the following raw materials in parts by weight: 10-20 parts isobutylene diurea, 1-3 parts 3,4-dimethyl-1H-pyrazole dihydrogen phosphate, 1-3 parts dicyandiamide DCD, 20-30 parts humic acid, and 30-50 parts organic fertilizer; the coating layer comprises the following raw materials in parts by weight: 5-10 parts natural nanotube halloysite, 3-5 parts bentonite, 5-10 parts cyclodextrin, 1-3 parts polyglutamic acid, 1-3 parts wood vinegar, and 5-10 parts polyacrylamide. The isobutylene diurea, humic acid, and organic fertilizer of this invention can effectively replenish organic matter and nitrogen in iron-aluminate soil, maintain soil nitrogen levels, and effectively control the conversion of ammonium nitrogen to nitrate nitrogen in lateritic soil, thereby reducing nitrogen loss and achieving a stable supply of nitrogen. In addition, polyglutamic acid and polyacrylamide have strong water retention capacity, and the fertilizer core is coated with a coating layer to achieve slow release and water retention.

The application discloses a preparation method and application of high-purity cesium iodide, which comprises the following steps: firstly, mixing an industrial-grade cesium source powder and an iodine source solution, and preparing a solid powder after vacuum rotary evaporation and drying; then repeatedly washing the powder by using a special detergent, removing impurities, and drying; sintering at a temperature of 200-350 DEG C; dissolving the sintered powder in deionized warm water, and cooling and crystallizing at 0 DEG C; and finally collecting and drying the crystallization product to obtain the high-purity cesium iodide (CsI) finished product. The CsI powder prepared by the application has a purity of more than 99.99%, can obtain more excellent comprehensive performance, and has a simple and controllable process, and has a wide application prospect in the field of perovskite solar cells.

This invention discloses an acid and alkali resistant polyamide membrane and its preparation method. The method is as follows: S1: Immerse the ultrafiltration base membrane in an aqueous sodium hydroxide solution for soaking and then set aside; S2: Treat the base membrane with a mixed aqueous solution of polyamine and aziridine crosslinking agent; S3: Wet the base membrane in an organic phase solution of polyacrylamide monomer to obtain a polyamide composite membrane; S4: Immerse the prepared polyamide composite membrane in an alcoholic solution of hydroxymethyl crosslinking agent, then dry it in a forced-air drying oven, and after washing with water, obtain the acid and alkali resistant polyamide membrane. This application uses two crosslinking agents, aziridine and hydroxymethyl, which can undergo specific crosslinking reactions with the carboxyl groups inside the polyamide membrane, to directly perform dual crosslinking modification on the membrane interior and surface, without introducing other polymer materials to avoid excessive increase in membrane permeation resistance. The polyamide membrane prepared by this method has both good acid and alkali resistance and water permeability.

The application discloses a preparation method and application of a metal boride composite metal single element and sulfur composite nanomaterial, relates to the technical field of energy materials, and comprises the following steps: dissolving a metal salt in methanol, quickly adding a 2-methyl imidazole aqueous solution, and preparing a MOF precursor; dispersing the MOF precursor in a methanol deionized water solution, adding a reducing agent solution, and preparing a metal boride material; dispersing the metal boride material in a metal salt aqueous solution at room temperature, adding a sodium hydroxide solution, and calcining the product in an inert gas and a reducing gas atmosphere in sequence to obtain a metal boride@metal single element composite material; and mixing and calcining the obtained metal boride@metal single element composite material and elemental sulfur according to a mass ratio of 1:1-4. The material has good lithium polysulfide adsorption capacity, accelerates the kinetic conversion of polysulfides, and can improve the stability and actual service life of a lithium-sulfur battery.

The utility model relates to the technical field of scroll compressors, in particular to a scroll compression structure for a scroll compressor and the scroll compressor, the scroll compression structure for the scroll compressor comprises a movable scroll plate, the movable scroll plate is made of aluminum alloy, and the surface of the movable scroll plate is coated with a nano graphene coating; and the static scroll plate is meshed with the movable scroll plate. According to the scroll compression structure for the scroll compressor and the scroll compressor, the problem that an existing scroll compression structure for the scroll compressor is seriously abraded can be solved.

The invention belongs to the technical field of solid waste recycling. The invention discloses a method for realizing high-value recycling of secondary aluminum ash and synchronous deep defluorination and dechlorination by utilizing hydrothermal synthesis. The method comprises the following steps: firstly, pretreating secondary aluminum ash, then preparing the pretreated secondary aluminum ash and water into slurry, and adding a specific defluorinating agent and a dechlorinating agent into the slurry to construct a synchronous reaction system; the system is subjected to hydrothermal reaction under high-temperature and high-pressure conditions, so that fluorine and chlorine elements are respectively fixed and converted into stable compounds. Solid-liquid separation is carried out after the reaction is completed, an obtained solid product can be used as a raw material for preparing a zeolite molecular sieve or an aluminum-based material, and salt is recovered from a liquid part through evaporative crystallization. According to the method, deep removal of harmful elements and a high-value recycling process of beneficial components are coupled to a single hydrothermal system, and efficient harmless and high-value recycling utilization of the secondary aluminum ash is achieved.

The application discloses a catalyst for synthesizing glycine and application of the catalyst in preparation of glycine, and relates to the technical field of glycine production. In the reaction process, one or more polymerization inhibitors are selected and the addition amount is controlled, so that the amount of formaldehyde is controlled to be reduced, the catalyst consumption is reduced, the catalyst consumption is reduced, and the glycine yield is improved.

This invention discloses a controllable interlaminar toughening method for composite materials. The method first mixes a thermosetting resin matrix with a prepolymerization degree of 10-60% with a toughening medium to form a film, which is then laminated with a fiber fabric to create a toughened prepreg tape. The toughened prepreg tape is then laid up and cured to obtain a toughened composite material. This method proposes a controllable interlaminar toughening technology for composite materials, utilizing the controllable solubility of the toughening medium in the thermosetting resin matrix to achieve the enrichment of the toughening medium in the interlaminar layers. This allows the composite material to possess good toughness and interfacial properties with a relatively low amount of toughening medium added. The technology is simple, offers controllable performance, and has a high level of technological maturity.

The invention relates to the technical field of sodium ion batteries, in particular to a modified layered transition metal oxide material and a preparation method and application thereof. The modified layered transition metal oxide material comprises a doped and modified layered transition metal oxide core and a coating layer coating the surface of the core, the core of the doped and modified layered transition metal oxide is Na < x > Ni Mn M < c > O < 2 >, xlt; 1, 0lt; a < lt >; 0.33, 0 lt; blt; 0.67, a + b + c = 1; m is selected from at least three of Ti < 4 + >, Zn < 2 + >, Mg < 2 + >, Cu < 2 + >, W < 5 + >, Mo < 4 + >, Sn < 4 + >, Sb < 5 + >, Zr < 4 + >, Al < 3 + >, Fe < 3 + >, Ca < 2 + >, V < 3 + >, Y < 3 + > or Ce < 4 + > ions; and the coating layer comprises the following components: carbon and sodium titanium phosphate. The modified layered transition metal oxide material provided by the invention has excellent stability and cycle performance.

This invention relates to the field of lithium extraction technology from lithium-containing organic wastewater, specifically to a method for preparing battery-grade lithium carbonate from lithium-containing organic wastewater. The method provided by this invention first recovers organic acids from the wastewater through esterification and hydrolysis reactions. Then, under pH 11-12 conditions, lithium is precipitated with trisodium phosphate to obtain crude lithium phosphate solid. The lithium is then enriched, dissolved in acid, and extracted to remove phosphoric acid. The raffinate is adjusted to pH 9-11 to remove impurities, yielding a lithium sulfate solution. After concentration using MVR (Medium-Volume Reduction), impurities are further removed under pH 10.5-11.5 and activated carbon adsorption conditions to obtain a pure lithium sulfate solution. The obtained pure lithium sulfate solution is mixed with a carbonate solution to obtain crude lithium carbonate. Finally, after washing, drying, crushing, and iron removal, battery-grade lithium carbonate is obtained.

The invention relates to the technical field of precious metal metallurgy, and discloses a high-density iridium ingot sedimentation type smelting process which comprises the following steps: preparing a water-cooled copper crucible with a zirconium oxide inner wall coating; iridium powder and calcium oxide powder are mixed and put into a crucible; performing induction heating in a vacuum environment until the raw materials are molten; protective gas is inflated, periodic variable-pressure oscillation operation is applied under the condition that the temperature of the melt is kept, and slag crust on the surface of the melt is destroyed through pressure fluctuation and deep gas is promoted to be exhausted; after oscillation is stopped, the melt is left to stand, and a slag system floats upwards and is separated; and establishing a bottom-to-top temperature gradient to control directional solidification of the melt. According to the invention, oxide hard shells are destroyed through a variable-pressure oscillation mechanism, and efficient degassing and impurity removal are realized by cooperating with calcium oxide slagging; the zirconia coating effectively prevents the crucible material from being polluted; the directional solidification and hot isostatic pressing process eliminates internal shrinkage cavities and looseness. According to the process, the impurity content in the iridium ingot is remarkably reduced, and the purity and compactness of the material are improved.

The present application relates to a kind of tetrahydroxy bile acid pharmaceutical composition and its preparation method and application.The present application provides a kind of pharmaceutical composition, it includes 100 weight parts of compound shown in formula I and 300~900 weight parts of saccharide.The present application also provides the use of the pharmaceutical composition in the preparation of drug for treating PFIC.The pharmaceutical composition of the present application can improve dose accuracy, solve the problem of poor taste of bile acid compound, easy to swallow, can improve the compliance of children drug.The pharmaceutical composition of the present application has good stability, easy to transport and store.In addition, the pharmaceutical composition of the present application realizes the stability of treatment effect under different doses, easy to accurately dose children according to body weight, while having good bioavailability, can realize good absorption and utilization in vivo.

The invention relates to the field of high polymer materials, in particular to composite resin and a preparation method and application thereof, and a gas separation membrane and a preparation method and application thereof. The composite resin comprises polyimide and a zeolite molecular sieve chemically bonded with amino groups on the surface. The polyimide composite resin provided by the invention is high in gas permeability coefficient and difficult to plasticize, and relieves the Trade-off effect to a certain extent. The method is especially suitable for preparation of gas separation membranes.

This invention provides a method for manufacturing dibenzylamine. Benzonitrile and a reaction solvent are mixed in a high-pressure reactor, and a hydrogenation reaction is carried out under the action of a ruthenium-iron bimetallic catalyst supported on cerium oxide to obtain a crude product. After cooling and filtering the catalyst, the crude product is purified by distillation to obtain the final dibenzylamine. This method features mild reaction conditions, high atom utilization, and meets the requirements of clean and green production.

This invention discloses an aluminum-containing heavy water-based electrolyte, its preparation method, and its applications. The electrolyte comprises a solvent and a solute. The solvent includes heavy water, a deuterated solvent, and a low-barrier hydrogen bond reconstructing agent. The solute comprises a main aluminum salt and an auxiliary monovalent metal salt. This electrolyte can construct low-barrier hydrogen bonds in solution by controlling the solvent composition, significantly reducing the activity of water in the solution, improving the electrochemical stability of the solution, and suppressing side reactions. Simultaneously, it improves the electrochemical reaction behavior of aluminum in the solution and at the electrolyte / electrode interface, which is beneficial for improving the electrochemical deposition efficiency of aluminum in aqueous solution.

The invention discloses an extraction process of citrus essential oil and the citrus essential oil prepared through the extraction process, and belongs to the field of natural perfume extraction.The extraction process of the citrus essential oil comprises the following steps that S1, peel of disinfected and cleaned fresh citrus fruits is obtained; s2, sequentially crushing and squeezing the fruit peels under the assistance of ultrasonic waves or without ultrasonic waves, and then separating out solid matters to obtain virgin juice; and S3, standing and layering the virgin juice in an environment of 0-10 DEG C, then centrifuging at a controlled temperature at a centrifugal speed of 2000-60000r / min for 1-180min, and separating out upper-layer essential oil within 30min after centrifugation is finished, so as to obtain the citrus essential oil. The process can improve the essential oil yield, reduce the water content and maintain the natural fragrance close to that of fresh fruits, and can be applied to the field of food and the field of daily chemicals.

This invention relates to a multifunctional bioactive dental bulk filling composite resin and its preparation method. The composite resin comprises an organic resin matrix and an inorganic filler; the organic resin matrix comprises polymerizable resin monomers and a photoinitiator system, the polymerizable resin monomers comprising dimethacrylate monomers and E-POSS; the inorganic filler comprises nMgO and sSiO2 with a silanized surface. The preparation method includes the following steps: preparing nMgO powder using a sol-gel method combined with a gradient calcination process; preparing submicron-sized sSiO2 using the Stöber method and subjecting it to surface silanization treatment to obtain silanized sSiO2; mixing the polymerizable resin monomers, E-POSS, and the photoinitiator system, stirring in the dark until a homogeneous resin matrix is ​​formed; adding the obtained nMgO and silanized sSiO2 to the resin matrix in a specific ratio and mixing and dispersing evenly to obtain an uncured paste-like composite resin.

The application relates to a preparation method of an entropy-based oxide catalyst with high metallic property and application of the entropy-based oxide catalyst in hydrogen production by acidic electrolytic water, and belongs to the field of catalysis. A water-soluble salt containing at least Ru, Ir and A is uniformly mixed, hydrolyzed and reduced under water bath stirring condition by taking zinc oxide as a carrier and a sodium borohydride solution as a reducing agent, then the black powder of the medium-entropy alloy is formed through filtration, washing and drying, and finally the black powder is subjected to rapid incomplete oxidation under the condition of 300-500 DEG C and air atmosphere, and then is subjected to acid pickling, filtration, washing and drying to prepare the entropy-based oxide catalyst with high metallic property. The catalyst contains a large amount of Ir-Ir metal bonds and / or Ir-Ru metal bonds, and the proportion can reach 30%-40%. The mismatch between the metal atom fingerprint structure and the metal-oxygen atom coordination structure causes serious lattice distortion, induces unbalanced distribution of stress and strain, and promotes the kinetics of the acidic oxygen evolution reaction.

The invention discloses a production method of monocrystal lithium manganese aluminate, which belongs to the technical field of preparation of lithium ion battery cathode materials, and comprises the following steps: taking manganous-manganic oxide, lithium carbonate and an aluminum-containing raw material, with the molar ratio of lithium carbonate to manganous-manganic oxide being Li: Mn being 0.50-0.55, the molar ratio of lithium carbonate to the aluminum-containing raw material being Li: Al being 1.00-1.05, and at the same time, carrying out a reaction for 2-3 hours to obtain the monocrystal lithium manganese aluminate. Adding a doping agent accounting for 0.02%-2.0% of the theoretical product mass, and mixing to obtain a uniform raw material; sintering the raw materials in an oxygen-enriched atmosphere at 800-950 DEG C for 8-16 hours to obtain a lithium manganese aluminate semi-finished product; crushing and crushing the lithium manganese aluminate semi-finished product to obtain a crushed product; through the synergistic effect of aluminum element doping and oxygen-enriched high-temperature sintering, the structural stability of the material is fundamentally improved.

The invention belongs to the technical field of plant puree preparation, and particularly relates to dendrobium puree as well as a preparation method and application thereof. According to the preparation method, firstly, a 1% sodium bicarbonate aqueous solution is used for conducting heat extraction on dendrobium nobile, the 1% sodium bicarbonate aqueous solution can neutralize the acid environment, and acidic hydrolysis of polysaccharide in the extraction process is inhibited; according to the method, an ethanol solution with the concentration of 50% is added into dendrobium residues extracted by a sodium bicarbonate aqueous solution with the concentration of 1% for re-extraction, gradient separation of components can be realized by using solvent systems with different polarities, and the ethanol solution with the concentration of 50% can dissolve acidic polysaccharide which is not dissolved by alkaline water in dendrobium and can effectively extract medium polar substances such as flavones and glycosides at the same time. In addition, a water-saturated n-butyl alcohol solution is continuously added into the extracted dendrobium residues for extraction, and residual polysaccharide and saponin components in the dendrobium are efficiently extracted. Through the steps, the raw stock components in the dendrobium nobile can be effectively reserved, and the dendrobium nobile has an excellent anti-inflammatory effect.

The invention discloses a positive electrode material and a preparation method thereof, a battery monomer, a battery device and a power utilization device. The battery monomer comprises a positive pole piece, the positive pole piece comprises a positive pole current collector and a positive pole film layer located on at least one side of the positive pole current collector, the positive pole film layer comprises a positive pole material, the positive pole material comprises an inner core and a positive pole active material with the chemical formula of LiFe1-x-yMnxMyPO4, x is more than 0 and less than 1, y is more than or equal to 0 and less than 1, and 1-x-y is more than 0 and less than 1; m is selected from one or more of IIA group elements, IIIA group elements, IVA group elements and transition metal elements; the coating material covers at least part of the surface of the inner core, and the coating material comprises a perovskite material; wherein the coating material forms a coating layer on the surface of the inner core, the coating uniformity of the coating layer is represented by a thickness value variation coefficient, and the thickness value variation coefficient of the coating layer is less than or equal to 50%. The battery monomer provided by the embodiment of the invention has improved cycle performance and high-temperature storage performance.