66 results about "Phosphate crystals" patented technology

The invention relates to a trimethylamine methanesulfonate second-order nonlinear optical crystal material and preparation and application thereof, the chemical formula of the crystal material is [(CH3) 3NH] < + > [SO3CH3] <->, the molecular weight is 154.21, the crystal material belongs to an orthorhombic crystal system, and the space group is Pca21 (No.29). According to the present invention, the powder frequency doubling effect of the nonlinear optical crystal [(CH3) 3NH] + [SO3CH3]-under 1064nm laser irradiation is about 0.5 time of the powder frequency doubling effect of the nonlinear optical crystal [(CH3) 3NH] + [SO3CH3]-under 1064nm laser irradiation, phase matching can be achieved, and the ultraviolet absorption cutoff edge is less than 200nm. The crystal material is easy to grow and shows important application value in the aspects of electro-optical modulation, holographic storage elements, frequency doubling devices and the like.

The invention provides a method for efficiently recovering low-concentration copper ions in wastewater based on phosphoric acid gradient regulation and seed crystal induction, which comprises the following steps: firstly, removing impurities such as Fe < 3 + >, Al < 3 + > and the like by using an acid-resistant flocculant under an acidic condition, and carrying out solid-liquid separation; adding nano hydroxyl copper phosphate seed crystals and a phosphoric acid solution into the supernate, inducing to generate high-purity copper phosphate crystals through stepped stirring under a neutral condition, and synchronously strengthening solid-liquid separation; the separated precipitate part is subjected to low-temperature calcination to be regenerated into active seed crystals for cyclic utilization, and the rest part is subjected to washing and vacuum drying to prepare a high-purity copper phosphate product. According to the method, gradient pH regulation and control, seed crystal induced crystallization and closed-loop regeneration technologies are innovatively combined, the copper ion recovery rate is larger than 95%, the product can be directly used for production of catalysts or battery materials, meanwhile, the agent consumption is reduced by 40% or above, the sludge amount is reduced by 50%, and high efficiency, economical efficiency and environmental protection value are achieved.

The invention discloses a method for preparing battery-grade iron phosphate by using titanium dioxide by-product ferrous chloride, and relates to the technical field of production of lithium iron phosphate precursors. Comprising the following steps: preparing a ferrous chloride crude product into a solution, adjusting the pH value of the solution, adopting an operation sequence of oxidizing ferrous ions while synthesizing the ferric phosphate during synthesis of the ferric phosphate, so that the conversion rate of the ferrous ions is high, the growth process of the ferric phosphate crystal is convenient to control, and then adjusting the pH value and the temperature again in the aging stage of the ferric phosphate crystal to obtain the ferric phosphate crystal. The influence of impurities in the iron phosphate is further reduced, so that the iron phosphate crude product is gradually converted into qualified iron phosphate. According to the method, in the process of preparing the battery-grade iron phosphate from the titanium dioxide by-product ferrous chloride, the influence of impurities in the by-product on synthesis and preparation can be reduced by adjusting the pH value of the corresponding solution for multiple times and optimizing the adding sequence of the reagents, so that the finished iron phosphate contains few impurities and is high in purity, the utilization rate of the titanium dioxide by-product ferrous chloride is increased, and the method is suitable for industrial production. The cost is saved.

The invention provides a method for increasing the iron-phosphorus ratio of an iron phosphate material. The method comprises the steps that S1, raw materials are prepared, wherein an ammonium phosphate solution, a phosphoric acid solution, a titanium dioxide ferrous solution and 30% hydrogen peroxide are prepared; s2, synthesis: adding an ammonium phosphate solution, a titanium dioxide ferrous solution and hydrogen peroxide into a reaction container, preserving heat, and performing suction filtration and washing until the conductivity of washing water is lower than 4000 [mu] S / cm to obtain a yellow primary washing filter cake; s3, conversion: weighing 5-15 kg of pure water, adding 200-400 g of ferrous sulfate and 200-600 g of a phosphoric acid solution, adding 2.5-3.5 kg of the yellow first-washing filter cake, and after pulpifying completely, heating, preserving heat, carrying out suction filtration and washing to obtain a pink second-washing filter cake; s4, calcining: drying, calcining and crushing to obtain a finished product iron phosphate; according to the method, ferrous sulfate is introduced as a catalyst in the process of converting ammonium ferric phosphate into ferric phosphate crystals, so that a material with a high iron-phosphorus ratio is obtained under the condition of low phosphoric acid dosage.

The invention provides an industrial-grade monoammonium phosphate crystal, a preparation method thereof and an iron phosphate crystal, and belongs to the field of battery materials, the industrial-grade monoammonium phosphate crystal is of a prism-shaped structure, the two ends of the prism are in a four-side conical shape, and the particle size of the prism is 500-700 microns; in percentage by mass, in the industrial grade monoammonium phosphate crystal, the content of P2O5 is greater than 61%, the content of N is greater than 11.5%, and the content of F ions is 50-150mg / kg. The wet-process phosphoric acid is used as a raw material, the phosphoric ore pulp, the defluorination agent and the ammonia-containing solution are sequentially introduced, desulfurization, defluorination and neutralization are performed respectively, and all reaction process parameters are strictly controlled, so that impurities are remarkably reduced; the prepared product is regular in particle morphology, uniform in particle size distribution and high in phosphorus and nitrogen content, and the lithium iron phosphate positive electrode material prepared from the precursor has good electrical properties; the preparation method has the advantages of simplicity in operation, easiness in reaction control, low cost and the like, and is suitable for large-scale industrial production.

The invention discloses preparation and application of a nickel selenide / ferronickel phosphate crystal / amorphous heterogeneous catalyst, and relates to the technical field of electrochemistry. Selenizing the foamed nickel at low temperature in an inert atmosphere to generate a crystalline NiSex layer in situ; and by taking the obtained electrode as a working electrode, carrying out electrodeposition in a deposition solution containing nickel salt, ferric salt, hypophosphite and acetate by adopting a cyclic voltammetry method, so that amorphous NiFePOy is deposited on the surface of NiSex, and a NiSex / NiFePOy crystal / amorphous heterostructure nanosheet layer is constructed and is used for an alkaline medium urea oxidation reaction. The invention has the following beneficial effects: crystalline / amorphous interface coupling and a nanosheet self-supporting structure synergistically improve active sites and charge transfer capability, reduce energy consumption and improve current output; meanwhile, the electrode stability and durability are enhanced; the method has the advantages of low material cost, mild and simple process, suitableness for amplified preparation, and application potential of urea-assisted water electrolysis energy-saving hydrogen production.

Ferric phosphate, a preparation method therefor, and the use thereof. The preparation method comprises the following steps: (1) performing corona discharge treatment on nanocellulose, and mixing same with water and an organic acid so as to obtain an esterified nanocellulose dispersion liquid; (2) mixing the esterified nanocellulose dispersion liquid with an oily solvent, and performing emulsification treatment to obtain an emulsion; (3) mixing a ferric salt solution with the emulsion, performing first stirring, adding a phosphate solution, adjusting the pH value of the mixed solution, performing second stirring, and performing sintering to obtain ferric phosphate. The present invention forms emulsion spheres from charged nanocellulose, directionally attaches metal cations to the surface of the nanocellulose, and finally reacts same with phosphate ions so as to obtain ferric phosphate crystals having good dispersity, thereby lowering the difficulty of crushing agglomerated ferric phosphate.

The present invention discloses a method for preparing anhydrous iron phosphate from medium and low grade phosphate rock, which comprises the following steps: Step 1: Provide medium and low grade phosphate rock; Step 2: Mix the phosphate rock with hydrochloric acid in a decomposition tank and fully react to obtain a first slurry; Step 3: Place the first filtrate into a sedimentation tank; Step 4: Add mixed acid to calcium dihydrogen chloride phosphate crystals, carry out pulping and filtration to obtain a second filtrate and a filter cake; Step 5: Finally, filter to obtain a gypsum product and a third filtrate; Step 6: The third filtrate in Step 5 is purified with saturated ferrous sulfate. The fourth filtrate obtained through a microfilter is continuously added with a saturated ferrous sulfate solution, then continuously added with 5-25% hydrogen peroxide, reacted for 5-35 minutes, then added with sodium hydroxide solution to adjust the pH value to 1.9-2.1, and kept warm and continuously reacted for 3-6 hours, and the iron phosphate obtained by filtration; Step 7: Dry the iron phosphate obtained in Step 6 at 150-170 °C to obtain anhydrous iron phosphate.

The present invention provides a method for highly efficient recovery of low-concentration copper ions in wastewater based on phosphoric acid gradient regulation and seed induction. First, under acidic conditions, acid-resistant flocculants are used to remove impurities such as Fe<supgt;3+< / supgt> and Al<supgt;3+< / supgt>, followed by solid-liquid separation; subsequently, nano-hydroxy copper phosphate seeds and phosphoric acid solution are added to the supernatant, and high-purity copper phosphate crystals are induced to form through stepwise stirring under neutral conditions, while simultaneously strengthening solid-liquid separation; a part of the separated precipitate is regenerated into active seeds by low-temperature calcination for recycling, and the remaining part is washed and vacuum dried to obtain high-purity copper phosphate products. The present invention innovatively combines gradient pH regulation, seed-induced crystallization, and closed-loop regeneration technology, achieving a copper ion recovery rate > 95%. The product can be directly used in the production of catalysts or battery materials, while reducing the consumption of chemicals by more than 40% and reducing the sludge volume by 50%, combining high efficiency, economy, and environmental protection value.

According to the preparation method, iron ions and phosphate ions are in a high-temperature and high-pressure environment, seed crystal generation and growth are controlled by presetting a specific crystal form, a large number of microcrystals are prevented from being instantly formed, the crystal size is controllable, the crystallinity is high, the consistency is good, and the conversion rate and the crystallization quality of the anhydrous iron phosphate are improved. Anhydrous iron phosphate is directly synthesized, sintering, dehydration and crystallization are not needed, washing water is greatly reduced, energy consumption and waste discharge are reduced, the influence of sintering on product quality fluctuation and poor consistency is avoided, and the production cost is reduced; the crystallinity and the particle size of the final iron phosphate crystal are adjusted by regulating and controlling the seed crystal type, the particle size and the dosage of the seed crystal, the dropwise adding speed and the stirring rotating speed of the iron source and the phosphorus source and the temperature and pressure during reaction, and on the premise that the high crystallinity and the stable and high iron-phosphorus ratio are kept, the specific surface area is adjustable within the range of 5-15 m < 2 > / g, the D50 is adjustable within the range of 0.8-12 microns, and the tap density is adjustable within the range of 0.6-1.55 g / cm < 3 >. And different application requirements are met.

A whitlockite preparation method includes: determining a size of the whitlockite crystal to be prepared; determining a first amount of a first cation other than calcium ion on the basis of the determined size of the crystal, wherein when the determined size of the whitlockite crystal is a first size, the first amount is determined to be a first value, wherein when the determined size is a second size larger than the first size, the first amount is determined to be a second value; mixing calcium ion and phosphate ion in order to prepare a first phosphate crystal, wherein the determined first amount of the cation other than calcium ion is also mixed therewith; mixing a second amount of cation other than calcium ion with phosphate ion to prepare a second phosphate crystal; and aging a solution containing the first phosphate crystal and the second phosphate crystal.

The present application provides a glass-ceramic, a method for preparing the glass-ceramic, and an electronic device. The glass-ceramic includes: a nepheline crystal phase, a phosphate crystal phase, and a niobate crystal phase. The present application utilizes the competitive growth of the niobate crystal phase and the phosphate crystal phase during the microcrystallization process to effectively inhibit the excessive growth or uneven growth of the phosphate crystal phase, thereby improving the mechanical properties of the glass-ceramic.

The application discloses a potassium dihydrogen phosphate solution cooling crystallization device and a use method thereof, and belongs to the technical field of crystallization devices. The device comprises a cooling cavity, a cooling pipe arranged at the central bottom of the cooling cavity, two turning plates, a push rod, a power source and two connecting rods. The two turning plates are respectively arranged at the two sides of the cooling pipe and are hingedly connected with the inner bottom of the cooling cavity. The two sides of the two turning plates are sealingly matched with the inner side wall of the cooling cavity. The one end of the connecting rod is connected with the other end of the turning plate. The power source is fixedly connected with the outer wall of the cooling cavity and is drivingly connected with the other end of the push rod. The two connecting rods are symmetrically fixedly connected with the inner top of the cooling cavity. The triangular cooling cavity is hingedly connected with the free end of the connecting rod, so that the longest side of the triangular cooling cavity is adjacent to the turning plate. The feeding port is arranged in the central top region of the cooling cavity. The application has the beneficial effects of improving the cooling effect, shortening the cooling time and improving the quality of the generated potassium dihydrogen phosphate crystal.

The present invention relates to the application of a methylene diboric acid second-order nonlinear optical crystal material in the field of nonlinear optics. The chemical formula of the crystal material is CH6B2O4, the molecular weight is 103.68, it belongs to the tetragonal crystal system, its space group is I41md, the unit cell parameters are α=β=γ=90°, Z=4, and the unit cell volume is . The methylene diboric acid crystal material of the present invention has excellent optical properties. Under 1064nm laser irradiation, the powder frequency harmonic intensity is approximately 0.3 times that of potassium dihydrogen phosphate crystal, and phase matching can be achieved. In addition, the single crystal preparation method of the second-order nonlinear optical material is simple, and its ultraviolet absorption cutoff edge is less than 190nm. These advantages make it have important application potential in the fields of laser frequency conversion, optical information processing, holographic storage, and optical communication.

The present application relates to the technical field of crystal nondestructive testing, and particularly relates to a crystal defect nondestructive testing method and system based on pumped probe transient absorption spectrum, which comprises the following steps: detecting a target region of a crystal to be tested by using pump light and probe light; collecting a transient absorption image of the target region according to a preset time delay between the pump light and the probe light, and extracting a target risk region; focusing the pump light and the probe light, and performing point-by-point scanning on the target risk region by using the focused pump light and probe light; collecting three-dimensional transient absorption intensity distribution and defect dynamic evolution data of each scanning point in the target risk region under different time delays; performing correlation calibration based on the transient absorption image and the three-dimensional transient absorption intensity distribution to obtain defect parameters; and constructing a damage prediction model based on sample damage threshold data, and outputting damage threshold prediction results according to the defect parameters. The purpose is to realize nondestructive and rapid detection of internal defects of deuterated potassium dihydrogen phosphate crystals.

The application belongs to the technical field of inorganic functional crystals, and particularly relates to a praseodymium ion doped phosphate crystal material and a preparation method and application thereof. The application provides a praseodymium ion doped phosphate crystal material, a chemical formula of the praseodymium ion doped phosphate crystal material is shown as formula 1: Ba3Y 1‑x (PO4)3:xPr formula 1; in formula 1, 0

An ornidazole phosphate crystal, an X-ray powder diffraction pattern thereof having characteristic absorption at the following 2θ±0.2 locations: 12.5, 13.2, 14.1, 17.0, 20.3, 21.6, 23.5, 23.9, 28.5 and 28.8; crystal form characteristics thereof are a=12.680 Å, b=8.898 Å, c=21.107 Å, α=90°, β=99.653°, γ=90°, V=2347.7 Å3. The ornidazole phosphate crystal has high purity, good crystal stability and a simple preparation method, and is suitable for industrial production.

The invention provides a positive electrode material, a positive plate, a battery and electric equipment, and relates to the technical field of batteries, the structure of the positive electrode material is a core-shell structure, a layered oxide is used as a core, and a polyanion material is used as a shell layer; the layered oxide is polycrystalline particles; the size of the ferric sodium pyrophosphate crystal in at least one dimension is 2-20 nm; and the size of the ferric sodium pyrophosphate crystal in at least one dimension is 500 nm to 1 [mu] m. According to the positive electrode material provided by the invention, the surface of the layered oxide particles is coated with the polyanion material which can be intercalated into the crystal gaps of the polycrystalline particles, so that lattice distortion of the O3-phase layered oxide is inhibited, and meanwhile, the charge-discharge capacity and the rate capability of the positive electrode material are optimized.

In order to solve the technical problem that an industrial preparation method of scandium metaphosphate is lacked in China at present, the invention provides a preparation method of optical-grade scandium metaphosphate, and the optical-grade scandium metaphosphate with the purity reaching 99.9% or above can be produced. The method comprises the following steps: dissolving scandium chloride hexahydrate by using a hydrochloric acid solution to obtain a scandium chloride solution, filtering and recrystallizing to obtain scandium chloride hexahydrate crystals, and reacting the scandium chloride hexahydrate crystals with an ammonium carbonate solution to obtain high-purity scandium carbonate; then, the diluted food-grade phosphoric acid and the high-purity scandium carbonate are subjected to a heat preservation stirring reaction, scandium dihydrogen phosphate crystals are obtained, the scandium dihydrogen phosphate crystals are subjected to low-temperature drying foaming treatment and high-temperature treatment, and scandium metaphosphate is obtained. According to the method, the optical-grade scandium metaphosphate with the purity reaching 99.9% or above can be industrially produced, and the use requirement of optical glass firing is met.

The invention provides a method for co-producing lithium hydroxide and lithium dihydrogen phosphate from crude lithium carbonate, which comprises the following steps: S1, pulping the crude lithium carbonate, mixing with a calcium-containing reagent, carrying out causticization reaction, and carrying out solid-liquid separation to obtain causticized liquid and causticized slag; s2, mixing a part of the causticized liquid with a first impurity removal agent and a second impurity removal agent for impurity removal, and after solid-liquid separation, taking a liquid phase to obtain a first impurity-removed liquid; and S3, mixing the first impurity-removed liquid with the remaining causticized liquid, performing resin impurity removal to obtain a second impurity-removed liquid, and performing evaporation concentration and solid-liquid separation on part of the second impurity-removed liquid in sequence to obtain lithium hydroxide crystals and lithium hydroxide mother liquor. And taking the residual second impurity-removed liquid in the step S3, and carrying out lithium precipitation and acidification to prepare lithium dihydrogen phosphate crystals. The problem of product singleness of lithium enterprises is solved.

The application provides a positive electrode material, a positive electrode sheet, a battery and an electric device, and relates to the technical field of batteries.The structure of the positive electrode material is a core-shell structure, the inner core of which is a layered oxide and the outer shell layer of which is a polyanion material.The layered oxide is a polycrystalline particle.The size of the sodium iron pyrophosphate phosphate crystal in at least one dimension is 2-20 nm, and the size of the sodium iron pyrophosphate phosphate crystal in at least one dimension is 500 nm-1 mu m.The positive electrode material provided by the application is coated on the surface of the layered oxide particle by using a polyanion material which can intercalate into the crystal gap of the polycrystalline particle, so as to inhibit the lattice distortion of the O3 phase layered oxide, and meanwhile, the charge and discharge capacity and the rate performance of the layered oxide are optimized.

The present invention belongs to the field of electrode material technology, and relates to a sodium ferrous fluorophosphate / N-CNT composite positive active material, including N-CNT, and sodium ferrous fluorophosphate composited on N-CNT. In addition, the present invention further relates to a method for preparing the material, which mixes iron phosphate and carbon nanotubes and then performs ammoniation roasting to obtain an iron phosphate / N-CNT intermediate; then the iron phosphate / N-CNT intermediate, a fluorine source and a sodium source are mixed, and then roasting treatment is performed to obtain the sodium ferrous fluorophosphate / N-CNT composite positive active material. The technical solution of the present invention, pre-ammoniation roasting of iron and phosphorus with iron phosphate phases is carried on the N-CNT structure, and then subsequent sodiumization and fluorination roasting are involved, so that the sodium ferrous fluorophosphate crystal phase structure can be controlled, the unit cell size can be controlled, the material morphology can be improved, and the ion and electronic conduction network construction can be effectively constructed, thereby effectively improving the capacity, rate and cycle stability of the material.

A whitlockite preparation method includes: determining a size of the whitlockite crystal to be prepared; determining a first amount of a first cation other than calcium ion on the basis of the determined size of the crystal, wherein when the determined size of the whitlockite crystal is a first size, the first amount is determined to be a first value, wherein when the determined size is a second size larger than the first size, the first amount is determined to be a second value; mixing calcium ion and phosphate ion in order to prepare a first phosphate crystal, wherein the determined first amount of the cation other than calcium ion is also mixed therewith; mixing a second amount of cation other than calcium ion with phosphate ion to prepare a second phosphate crystal; and aging a solution containing the first phosphate crystal and the second phosphate crystal.

The present invention relates to a molybdenum strontium peroxide second-order nonlinear optical crystal and its preparation and application. The chemical formula of the crystal material is SrMo2O3(O2)4(H2O)2·3H2O, the molecular weight is 545.58, it belongs to the tetragonal crystal system, its space group is , the unit cell parameters are α=β=γ=90°, Z=8, and the unit cell volume is . The molybdenum strontium peroxide crystal material of the present invention has excellent optical properties. Under 1064nm laser irradiation, the powder frequency harmonic intensity is about 3 times that of potassium dihydrogen phosphate crystal, and phase matching can be achieved. The crystal material is not only easy to grow, but also can effectively expand the wavelength range of coherent light sources through optical frequency conversion technologies such as second harmonic generation and optical parametric amplification. In the fields of laser lithography, laser processing, medical diagnosis and treatment, this crystal material shows important application prospects.

The present invention relates to a trimethylammonium methanesulfonate second-order nonlinear optical crystal material and its preparation and application. The chemical formula of the crystal material is [(CH3)3NH] + [SO3CH3] ‑ , molecular weight is 154.21, belongs to the orthorhombic system, space group is Pca21 (No.29). The unit cell parameters are α=γ=β=90°, Z=4, and the unit cell volume is the nonlinear optical crystal [(CH3)3NH] + [SO3CH3] ‑ Under 1064nm laser irradiation, the powder's frequency-doubled effect is approximately 0.5 times that of potassium dihydrogen phosphate crystals, and phase matching is achieved, with a UV absorption cutoff edge less than 200nm. This crystal material is easy to grow and exhibits significant application value in electro-optical modulation, holographic storage elements, and frequency-doubled devices.

A sintered membrane is a ceramic article having a primary crystal phase including lithium-aluminum-titanium-phosphate crystals and a secondary crystal phase including anatase or lithium-titanium-oxyphosphate crystals. In aspects, the sintered membrane can have a closed porosity of less than or equal to 5%. In aspects, the primary crystal phase can be from 95% to 100% of a volume of the ceramic article, and the secondary crystal phase can be from greater than 0% to 5% of the volume of the ceramic article. In aspects, the sintered membrane can exhibit a total leaching of less than or equal to 5 parts-per-million in a Leaching Test. Methods of making a sintered membrane includes forming a green tape having lithium-aluminum-titanium-phosphate crystals and an additive including a titanium-containing powder or an aluminum-containing powder, where the green tape is heated to a first temperature from 600°C to 1200°C to form the sintered membrane.

The present invention discloses a method for predicting crystal growth based on GBDT and its application, the method comprising: obtaining historical data of crystal growth test, determining three influencing factors of temperature, crystal height and solution saturation point temperature that affect crystal growth, constructing a data set, wherein the crystal is any one of potassium dideuterium phosphate, potassium dihydrogen phosphate, ammonium dihydrogen phosphate and dideuterium ammonium phosphate crystals; after pretreatment, taking the mean square error of crystal growth prediction as the objective function, constructing a gradient boosting decision tree model, and training the gradient boosting decision tree model with the pretreated training set, using Bayesian optimization model hyperparameters until the model prediction reaches the optimum; obtaining the influencing factor data of the current crystal growth test, and predicting the crystal growth with the trained gradient boosting decision tree model. The present invention uses the gradient boosting decision tree model to predict the crystal growth value, and realizes real-time monitoring and scientific regulation of the crystal growth process.

The invention discloses a Fe (II)-based fluorine-containing phosphate crystal as well as a preparation method and application thereof. A fluorine-rich hydrothermal method based on an oxidation-reduction reaction is an effective path for preparing Fe (II)-based fluorophosphate. The structural formula of the Fe (II) group-containing fluorine-containing phosphate crystal is BaFePO4F, the Fe (II) group-containing fluorine-containing phosphate crystal is crystallized in an orthorhombic crystal system, and the space group is P212121. According to the invention, the Mssbauer spectrum of the BaFePO4F is analyzed, Fe is proved to be II valence, the analysis of the magnetic susceptibility and specific heat of the BaFePO4F also finds that the BaFePO4F has antiferromagnetic interaction, and the antiferromagnetic ordered temperature of the BaFePO4F is 13.5 K. The invention also discloses a preparation method of the BaFePO4F. The Fe (II)-based fluorine-containing phosphate is stable in physical and chemical properties and easy to process and preserve; reagents and raw materials adopted by the method have low toxicity to human bodies, the production period is short, and the cost is low.

The invention discloses a cylindrical light-transmitting frequency doubling device for generating tunable yellow light and a laser device, and belongs to the nonlinear optical technology, the cylindrical light-transmitting frequency doubling device comprises a rubidium titanyl phosphate crystal, the rubidium titanyl phosphate crystal is processed into a cylinder along the Y-axis direction, and the cylindrical surface of the cylinder is plated with a dual-waveband antireflection film of 1140-1180 nm and a dual-waveband antireflection film of 570-590 nm. By means of the cylindrical surface light-passing frequency doubling device, the comprehensive performance of the yellow light frequency doubling device can be improved.

The invention provides a positive electrode material with a core-shell structure, a positive electrode, a battery and electric equipment, and relates to the technical field of batteries, the positive electrode material with the core-shell structure takes O3-phase layered oxide polycrystalline particles as a core, and takes whisker-shaped ferric sodium pyrophosphate phosphate crystals as a shell; and whisker-shaped ferric sodium pyrophosphate crystals partially positioned on the interface of the inner core and the shell are obliquely embedded into the inner core. The shell material part of the positive electrode material of the core-shell structure provided by the invention is obliquely inserted into the inner core to form an oblique pinning structure, so that the interface bonding strength of the shell and the inner core can be improved, and the expansion inhibition effect of the shell on the inner core is improved.