107results about "Boron-oxygen compounds" patented technology

The invention discloses a gadolinium boron molybdate magnetic refrigeration material with triangular magnetic resistance and a preparation method and application of the gadolinium boron molybdate magnetic refrigeration material. The chemical formula of the material is Gd2B2MoO9, the material belongs to a triclinic system, and the space group is P-1; the crystal structure has the characteristic that nearest rare earth Gd ions have magnetic resistance file; the material is prepared by a solid phase method or a sol-gel method; the magnetic phase change temperature of the material is 0.7-0.9 K, the material shows a remarkable magnetothermal effect at low temperature, the maximum isothermal magnetic entropy change values of the material are 30.0-35.0 J / kg.K and 51.0-55.0 J / kg.K respectively under the magnetic field change of 0-2T and 0-5T, and the material can be applied to low-temperature magnetic refrigeration. The gadolinium boron molybdate Gd2B2MoO9 material with triangular magnetoresistance provided by the invention has the advantages of low raw material price, simple process and lower equipment requirement, and is suitable for industrial production.

The invention discloses a graphene oxide sheet long-afterglow material and a preparation method and application thereof.The preparation method of the graphene oxide sheet long-afterglow material comprises the steps that a graphite oxide electrode sheet serves as a working electrode, and the working electrode, a counter electrode and a reference electrode are immersed in electrolyte; direct current is applied through an electrochemical workstation, so that the voltage difference between the working electrode and the reference electrode is 1.8-2.0 V, an electrochemical reaction circuit is formed, electrochemical reaction is carried out until the current in a loop where the working electrode and the counter electrode are located is smaller than or equal to 1 mA, the electrochemical reaction is stopped, and the electrolyte is a saturated boric acid aqueous solution. According to the invention, through electrochemical intercalation and oxygen evolution reaction, the graphite oxide electrode plate is stripped from the graphene oxide sheet and is simultaneously compounded with the boric acid crystal in situ, so that the graphene oxide sheet long-afterglow material is directly obtained in one step, and the danger of a traditional method and the redundancy of multi-step preparation are eliminated.

The invention relates to the technical field of silicon-carbon negative electrodes, in particular to a silicon-carbon negative electrode precursor material, a silicon-carbon negative electrode material and a preparation method of the silicon-carbon negative electrode precursor material. Preparing a porous carbon material; performing vapor deposition on a silicon source on the porous carbon material to obtain a silicon / porous carbon material; putting boron oxide and the silicon / porous carbon material into a ball milling tank according to a mass ratio of (1-5): (80-200), and carrying out ball milling for 1-3 hours to obtain a silicon-carbon negative electrode precursor material; according to the silicon-carbon negative electrode precursor material, the silicon-carbon negative electrode material and the preparation method of the silicon-carbon negative electrode material, the porous carbon material is prepared from the biomass carbon material, the silicon element is deposited on the porous carbon material, the boron element is doped on the porous carbon material, and the obtained silicon-carbon negative electrode material has excellent capacity and capacity retention rate and high electrochemical stability.

The invention relates to the technical field of lithium ion batteries, in particular to a low-temperature positive electrode material, a preparation method thereof, a positive plate and a lithium ion battery. The low-temperature positive electrode material comprises a base material and a coating layer, the preparation raw materials of the low-temperature positive electrode material comprise a first precursor and a second precursor, and the mass ratio of the first precursor to the second precursor is n; n, the average size r of single crystal particles of the low-temperature positive electrode material, the pole piece compaction density PD of the positive electrode piece containing the low-temperature positive electrode material, and the particle size d99 and particle size dmin of the low-temperature positive electrode material meet the condition that (n * PD * d99) / (dmin * r) is greater than or equal to 30 and less than or equal to 100. The low-temperature positive electrode material is low in cost and good in low-temperature charge-discharge performance.

The present application provides a method for extracting lithium from salt lakes. The method comprises the following steps: (1) subjecting concentrated brine to ammonia vapor magnesium precipitation treatment to obtain a magnesium-removed filtrate and filter residue; (2) mixing the filter residue with hydrobromic acid, adjusting the pH to precipitate boric acid, and performing solid-liquid separation to obtain a filtrate and boric acid; (3) evaporating and concentrating the filtrate obtained in step (2), performing aeration treatment after drying treatment, and performing water immersion separation treatment to obtain a lithium-rich solution and magnesium oxide; (4) mixing the lithium-rich solution and lithium carbonate to perform a solid-phase transformation reaction, and filtering to obtain a purified lithium salt solution and calcium carbonate. The method of the present application can separate boron, magnesium, and calcium-lithium in one step, and further calcium removal can separate calcium and lithium, which is beneficial to obtaining high-purity lithium carbonate and reducing lithium loss caused by the adsorption of lithium by magnesium hydroxide colloid.

The present invention provides an oxyhalide, a preparation method therefor, and an all-solid-state lithium battery. The preparation method comprises: (1) grinding a mixture of a lithium source and a boron source, which are weighed in a stoichiometric ratio, tableting the mixture, then putting the tableted mixture into a reaction tube, evacuating the reaction tube to establish a vacuum, sealing the reaction tube, and then performing primary calcination, wherein the primary calcination temperature is 300-450ºC, and the primary calcination time is 4-20 h; and (2) after the primary calcination, cooling to room temperature, taking out the intermediate product from the reaction tube, grinding and tableting the intermediate product, then putting the tableted product into a reaction tube, evacuating the reaction tube to establish a vacuum, sealing the reaction tube, performing secondary calcination, and then cooling to room temperature. The preparation method of the present invention is simple and has high raw material utilization rate and no byproducts, thereby facilitating industrial production. The prepared oxyhalide has relatively high ionic conductivity and stability, and relatively good interface stability with metal lithium. The prepared all-solid-state lithium battery has excellent electrochemical performance.

A method of producing a chemical hydride is described and which includes selecting a composition having chemical bonds and which is capable of forming a chemical hydride; providing a source of a hydrocarbon; and reacting the composition with the source of the hydrocarbon to generate a chemical hydride.

The invention relates to the technical field of extraction of lithium, potassium and boron in salt lakes, and discloses a method for co-producing lithium, potassium and boron by gradient utilization of original brine in salt lakes. The method comprises the following steps: S1, extracting lithium from original salt lake brine to obtain qualified lithium liquid and lithium extraction tail liquid; s2, preparing a battery-grade lithium product by using the qualified lithium liquid; s3, the lithium extraction tail liquid is subjected to beach drying through a salt pan, and potassium-containing solid salt (potassium mixed salt and carnallite), liquid old brine and bischofite are obtained; s4, preparing a potassium chloride product from the potassium-containing solid salt and bischofite; and S5, preparing a boric acid product by using the old brine. According to the method, a lithium extraction pre-treatment and salt lake brine potassium, boron and lithium process technical route is converted into a lithium, potassium and boron process route, the production cycle of a lithium salt product is shortened to 2 months from original 2-3 years, the lithium yield is increased by about one time, and meanwhile, the lithium-potassium-boron process is adopted, so that the problem that lithium extraction films and equipment are corroded and influenced by boron extraction acidification is solved, and the method is suitable for industrial production. Comprehensive development and utilization of salt lake resources are realized.

The present invention discloses a method for preparing battery-grade lithium dihydrogen phosphate and boric acid. The preparation method comprises: subjecting carbonate-type salt lake halogen or lithium carbonate lithium precipitation mother liquor to adsorption-desorption treatment to obtain a desorption liquid; subjecting the desorption liquid to forward osmosis primary concentration, nanofiltration separation, and electrodialysis secondary concentration treatment to obtain a secondary concentrated lithium-rich solution; wherein the content of lithium ions in the secondary concentrated lithium-rich solution is 8.0-20.0 g / L; subjecting the secondary concentrated lithium-rich solution to boron removal treatment to obtain a deborated lithium-rich solution and boric acid; and, adjusting the pH value of the deborated lithium-rich solution to 0.5-4, and then performing MVR evaporation crystallization to obtain battery-grade lithium dihydrogen phosphate. The present invention provides the co-production of boric acid while preparing battery-grade lithium dihydrogen phosphate, realizing the comprehensive, green, efficient, and high-value development and utilization of salt lake resources, and reducing production costs.

The invention provides a step-by-step extraction process for potassium-rich multi-component brine, which sequentially comprises the following steps of: performing negative-pressure desulfurization on the brine to produce an alkali sulfide product; a boric acid product is produced through boron extraction by an adsorption method; magnesium hydroxide and calcium sulfate products are produced through a lime method reaction; a sodium chloride product is produced through I-stage evaporative crystallization; a calcium carbonate product is produced through a sodium carbonate method; the method comprises the following steps of: producing a lithium carbonate product by adsorbing and extracting lithium, producing iodine and bromine products by oxidizing and blowing iodine and bromine, producing a cesium nitrate product by adsorbing and extracting cesium, producing rubidium nitrate by adsorbing and extracting rubidium, and preparing sodium chloride and potassium chloride products by evaporating and concentrating at the section II. And the product quality is high, the element yield is high, the production cost is low, the operation is simple, the post labor intensity is small, the closed cycle is realized in the extraction process, the emission of three wastes is avoided, and the green and environment-friendly production is realized.

The invention discloses a lithium ion battery ultrahigh nickel positive electrode material and a preparation method and application thereof, and belongs to the technical field of lithium ion batteries. The ultrahigh nickel positive electrode material is formed by coating the surface of a boron-doped nickel cobalt lithium manganate positive electrode material with a hydrophobic transition metal diboride. The surface of the ultra-high nickel active material is coated with the thin and uniform transition metal diboride hydrophobic coating layer, transition metal diboride has high ionic conductivity, and the obtained lithium ion battery has good cycle performance; the transition metal diboride can ensure the hydrophobic property, so that the stability of the lithium ion battery in the environment is ensured; the surface transition metal diboride and internally doped boron ions are synergistically modified, so that the cycle performance, the rate capability and the safety performance of the material in battery application are remarkably improved.

The invention relates to the technical field of heat-insulating and demagnetizing refrigeration, and discloses a heat-insulating and demagnetizing refrigeration material based on a Trellis crystal lattice and a preparation method and application of the heat-insulating and demagnetizing refrigeration material. The chemical formula of the heat insulation and demagnetization refrigeration material based on the Trellis crystal lattice is Gd2GeB2O8. A magnetic test result of the Gd2GeB2O8 crystal shows that the magnetic anisotropy of the crystal material is relatively weak and tends to magnetic isotropy, and a long-range magnetic orderliness phenomenon is not observed above 1.8 K. And when adiabatic demagnetization is carried out under initial conditions that T is equal to 3K and B is equal to 7T, the material can reach the maximum negative magnetic entropy difference of 51.68 J * kg <-1 > * K <-1 >, which shows that the Gd2GeB2O8 has a better application prospect in a 3-17K temperature zone and a sub-Kelvin temperature zone.

The present invention provides a method for recovering iodine and boric acid from iodine-containing waste liquid. The method includes: subjecting the iodine-containing waste liquid to primary acidification after pretreatment, followed by solid-liquid separation to obtain boric acid and iodine-containing solution; sequentially performing secondary acidification and oxidation on the iodine-containing solution to obtain a solid-liquid mixture containing iodine and boric acid; adjusting the pH value of the solid-liquid mixture with alkali and then performing solid-liquid separation to obtain iodine and a salt-containing solution; subjecting the iodine vapor generated during the reaction to condensation and spray absorption in sequence, and returning the condensed iodine for co-recovery. The method of the present invention first precipitates boric acid through acidification treatment according to the composition of the iodine-containing waste liquid, recovers the boric acid product, and then obtains a high-purity iodine product through further acidification and oxidation reactions; the present invention condenses and spray-absorbs the iodine vapor to avoid iodine loss and possible environmental pollution, and ensures the iodine recovery rate; the method is simple to operate, has mild conditions, low cost, and realizes the resource utilization of the waste liquid.

The invention relates to the technical field of batteries, in particular to a positive electrode material and a preparation method and application thereof. The positive electrode material comprises: an inner core, the inner core satisfies a chemical general formula LizMnxFe (1-x) RyPO4, and 0.5 < = xlt; 1, 0lt; yt; Yt; 0.1, 0.9 < = z < = 1.2; r comprises at least one of Al, Mg, Ca, Sr, V, Cr, Y, Mo, Nb, B, W, La, Sm, Co, Ni, Cu, Zn, Zr and Ti; the coating layer is arranged on at least part of the surface of the inner core, and the coating layer comprises a boron-doped carbon coating layer. The lithium manganese iron phosphate positive electrode material is synergistically modified in a multi-element doping and boron doping carbon coating manner, so that the lithium ion transmission path can be widened, more electron holes can be formed, the electron transmission efficiency can be improved, the conductivity of the material can be improved, and the rate and the dynamic performance of the material can be further improved; and relatively high and stable cycle performance is ensured.

The application discloses a surface-coated and bulk-gradient co-doped sodium ion battery positive electrode material and a preparation method and a sodium ion battery thereof, and belongs to the technical field of sodium ion batteries. The sodium ion battery positive electrode material comprises a layered transition metal oxide and a coating layer coated on the surface of the layered transition metal oxide; the layered transition metal oxide is a nickel-iron-manganese-based layered transition metal oxide, and the coating layer is an amorphous boron oxide coating layer; the chemical formula of the surface-coated and bulk-gradient co-doped sodium ion battery positive electrode material is Na(Ni 1 / 3 Fe 1 / 3 Mn 1 / 3 ) x B y M z O2, 0.9≤x≤0.98, 0.01≤y<0.2, 0.01≤z<0.1, and x+y+z=1, and M is selected from W or Nb; wherein the doping concentration of boron elements and metal M elements presents a gradient decreasing trend from the surface layer to the inside along the radial direction; the surface boron oxide coating and the bulk-gradient doping of boron elements and metal M elements are simultaneously realized; the surface coating layer effectively reduces the interface side reaction, and the bulk-gradient doping stabilizes the crystal structure from the inside; and the two synergistically act to jointly inhibit the structural degradation in the cycle process.

The utility model relates to the technical field of boric acid production, and discloses a boric acid production impurity separation device which comprises a bottom plate, a first gear fixedly connected to the outer surface of a driving rod, a rotating rod fixedly connected to the interior of a second gear, and stirring rods fixedly connected to the outer surface of the rotating rod and the outer surface of the driving rod. A discharging brush is fixedly connected to the outer surface of the driving rod, and an annular discharging plate is arranged at the bottom of the treatment tank. According to the stirring device, the driving motor is started, the first gear on the driving rod drives the rotating rod to rotate through the second gear, the stirring rods stir dissolved substances in the tank in a staggered mode, and after the dissolved substances are dissolved and precipitated, the annular discharging plate is opened to carry out the subsequent impurity removal procedure. And the residual solution passes through an adsorption column filled with a special adsorbent, so that impurities in the boric acid solution can be further adsorbed and removed, and the adsorption effect is better.

A method for producing a positive electrode active material for a lithium ion secondary battery, the method comprising a mixing step of mixing a nickel-containing substance containing at least nickel and a lithium compound to prepare a first raw material mixture, a sintering step of sintering the first raw material mixture in an oxidizing atmosphere to obtain a sintered material, and a water washing step of washing the sintered material with water, the method includes a sintering step in which a first starting material mixture is prepared, a washing step in which the sintered material obtained in the sintering step is washed to obtain a dehydrated cake, a boron addition step in which the dehydrated cake obtained in the washing step and a boron-containing substance are mixed to prepare a second starting material mixture, the boron-containing substance being at least one substance selected from a boron monomer and a boron-containing compound, and a heat treatment step in which the second starting material mixture is heat-treated.

The present invention discloses a method for co-producing lithium phosphate and magnesium-based functional materials. The method comprises: subjecting salt lake brine to primary adsorption-desorption and secondary adsorption-desorption treatment in sequence to obtain a mixed desorption liquid; subjecting the mixed desorption liquid to a forward osmosis primary concentration treatment to obtain a primary concentrated liquid and forward osmosis fresh water; subjecting the primary concentrated liquid to a high-pressure reverse osmosis secondary concentration treatment to obtain a secondary concentrated liquid and reverse osmosis fresh water; mixing the secondary concentrated liquid with aluminum salt and alkaline solution to a first coprecipitation reaction to obtain a magnesium-based functional material and a filtrate; subjecting the filtrate to a boron removal treatment by an ion exchange method to obtain a boron-removed lithium-rich solution and boric acid; and subjecting the boron-removed lithium-rich solution to a lithium precipitation treatment by an ultrasonic precipitation-ultrasonic coupling method to obtain battery-grade lithium phosphate. The method provided by the present invention realizes the co-production of lithium phosphate and magnesium-based functional materials, and at the same time realizes the comprehensive, green, efficient and high-value development and utilization of salt lake resources.

The invention relates to the technical field of chemical devices, in particular to a hydrolytic crystallization device, a hydrolytic crystallization method and a system for manufacturing boric acid. The hydrolytic crystallization device comprises a container body, a cyclic heating assembly, a flow guide part, a stirring assembly, a crystal collecting assembly and a steam collecting part. The container body is arranged to form a hydrolytic crystallization chamber and a feeding hole; the circulating heating assembly heats the materials and then returns the materials to the crystallization chamber, and the process is circulated; the flow guide part is arranged in the hydrolytic crystallization chamber and used for forming a flow guide chamber, and the top and the bottom of the flow guide chamber are both communicated with the hydrolytic crystallization chamber; the stirring assembly is arranged to stir materials in the flow guide chamber; part of materials at the bottom of the crystallization chamber can flow downwards to enter the crystal collection assembly; the steam collecting piece is used for condensing steam at the top of the hydrolysis crystallization chamber into liquid and collecting the liquid. According to the hydrolytic crystallization device, the crystallization efficiency and the grain uniformity can be improved.

The present application relates to a kind of sodium sulfate iron composite sodium ion positive electrode material and its preparation method and battery, belong to sodium battery technical field, to solve at least one of the problems such as the poor air stability and conductivity of the sodium sulfate iron positive electrode material prepared by the existing method, easily lead to the capacity and cycle stability of battery is low, limit the application of sodium sulfate iron positive electrode material in sodium ion battery.The inner layer of the sodium ion positive electrode material of the present application is boron oxide coated sodium sulfate iron, the middle layer is boron-carbon nanotube transition layer, the outer layer is carbon nanotube coated sodium sodium pyrophosphate phosphate, boron-carbon nanotube transition layer is formed by the covalent bonding reaction of boron oxide and the functional group of CNTs after high-temperature induced decomposition of boric acid, double optimization is carried out in the interface combination and conductivity, improve the ion conductivity of sodium ion positive electrode material, the capacity of positive electrode material, rate and cycle performance, especially air stability.

Solid-state batteries, battery components, and related methods for their production are provided. The battery electrode or separator comprises a sintered electrochemically active material, an inorganic solid particulate electrolyte having a large particle size, and a low melting point solid inorganic electrolyte used as a binder and / or sintering aid in the electrode.

A method for producing a positive electrode active material for a lithium ion secondary battery, the method comprising a mixing step in which a nickel-containing material containing at least nickel and a lithium compound are mixed to prepare a first starting material mixture, a sintering step in which the first starting material mixture is sintered in an oxidizing atmosphere to obtain a sintered material, and a step in which the sintered material obtained in the sintering step is washed with water to obtain a positive electrode active material for a lithium ion secondary battery. A boron addition step for preparing a second starting material mixture by mixing the water-washed powder obtained in the water-washing step with a boron-containing substance, which is at least one substance selected from a boron monomer and a boron compound; a heat treatment step for heat-treating the second starting material mixture; and a cooling step in which at least an atmosphere in a temperature region equal to or lower than the boundary temperature is used as a carbon dioxide removal atmosphere and cooling is performed.

The application belongs to the technical field of fine chemical industry, and specifically provides a process method for preparing nuclear-grade boric acid by reverse osmosis membrane purification of boric acid, which comprises the following process steps: pretreatment, complexation impurity removal, two-stage membrane separation, and rate control crystallization. The process method has the advantages of excellent impurity removal effect, simple process, easy operation and control, good reproducibility, low production cost, environmental friendliness, etc., and the prepared nuclear-grade boric acid is suitable for the field of nuclear industry, electronic-grade materials and other fields with high requirements for the purity of boric acid.

The invention relates to a device and method for preparing boric acid from a boron trifluoride-methyl ether complex, the device comprises a steam generator, a gasification device and a reactor, and the steam generator and the gasification device are gathered through a pipeline and then connected with the reactor; the steam generator is used for producing steam; and the gasification device is used for producing a gas boron trifluoride-methyl ether complex. The method for preparing boric acid comprises the following steps: step 1, air replacement; step 2, preheating; 3, enabling water vapor to react with the boron trifluoride-methyl ether complex in a reactor to obtain a primary product; and step 4, after the reaction is completed, continuously keeping the temperature. The boron trifluoride-methyl ether complex reacts with water vapor at high temperature, boron oxide is obtained through a one-step method, the technical route is greatly simplified, the yield of boron is increased, and production energy consumption is reduced.

The present invention relates to a nickel-based active material precursor, a method for preparing the same, a nickel-based active material, and a lithium secondary battery. A nickel-based active material precursor for a lithium secondary battery includes a secondary particle including a plurality of particulate structures, in which each particulate structure includes a porous core portion and a shell portion, the shell portion includes primary particles radially arranged on the porous core portion, and the secondary particle has a plurality of radial centers. When the nickel-based active material precursor for a lithium secondary battery is used, a nickel-based active material in which intercalation and deintercalation of lithium are promoted and the diffusion distance of lithium ions is short can be obtained. A lithium secondary battery manufactured using the nickel-based active material exhibits improved lithium availability and exhibits improved capacity and lifespan due to suppressed occurrence of cracks in the active material according to charging and discharging.

The invention belongs to the technical field of fine chemical engineering, and particularly provides a process method for preparing nuclear-grade boric acid by purifying boric acid through a reverse osmosis membrane, and the process method comprises the following process steps: pretreatment, complexing impurity removal, two-stage membrane separation and speed-controlled crystallization. The technological method provided by the invention has the advantages of being excellent in impurity removal effect, simple in process, easy to operate and control, good in reproducibility, low in production cost, environment-friendly and the like, and the prepared nuclear-grade boric acid is suitable for the fields of nuclear industry, electronic-grade materials and the like which have high requirements on the purity of boric acid.

The present application relates to the field of biological enzyme catalyst, especially to a kind of immobilized laccase based on inorganic porous material and its preparation method and application, the immobilized laccase based on inorganic porous material designed in the present application, the immobilized laccase includes inorganic porous material and laccase adsorbed and fixed on the surface of inorganic porous material, the inorganic porous material is prepared by dynamic hydrothermal synthesis method with piperidine as template agent, with aluminum isopropylate as aluminum source, boric acid as boron source, fumed silica as silicon source. Laccase is adsorbed and immobilized by using the inorganic porous material, and the immobilized laccase catalyst obtained has good enzymatic performance, and the immobilized laccase has significant effect in removing quinolone antibiotics.

The embodiment of the invention relates to the technical field of chemical devices, in particular to an esterification device and a system for manufacturing boric acid. The esterification device comprises an esterification container, a heating piece and a stirring assembly, the esterification container forms an esterification chamber and a liquid inlet, a feed port and a discharge port which are communicated with the esterification container, the liquid inlet is used for introducing a boron trifluoride-methanol complex into the esterification chamber, the feed port is used for introducing a solid defluorination agent into the esterification chamber, and the discharge port is used for discharging the boron trifluoride-methanol complex into the esterification chamber; the boron trifluoride-methanol complex and the solid defluorinating agent are subjected to an esterification reaction in the esterification chamber to generate trimethyl borate and a solid by-product; the heating piece is arranged to heat the esterification chamber and keep the temperature in the esterification chamber stable; the stirring assembly is used for stirring the materials in the esterification chamber, so that the materials are uniformly mixed. According to the esterification device, the temperature in the esterification chamber is kept constant through the heating piece, the reaction process is accelerated through the stirring assembly, and the esterification reaction rate and the material conversion rate can be increased.

The present invention provides a flaky boric acid and a preparation method thereof. The morphology of the flaky boric acid is flaky, D 50 The particle size is not less than 3 mm. The boric acid flakes provided by the present invention have D 50 The characteristic of larger particle size.

The present application relates to a series of compounds calcium halogenated borate and calcium halogenated borate nonlinear optical crystal and preparation method and use, the molecular general formula of the series of compounds is Ca2B3O6X, wherein X=Cl, Br, molecular weight 244.04-288.50, the compound is synthesized using solid phase reaction method;The crystal is orthorhombic, space group Cmc 21, the cell parameter is a=15.360 (6)-15.406 (2) Å, b=22.115 (3)-22.175 (10) Å, c=7.3617 (11)-7.454 (4) Å, Z=16, V=2508.2 (6)-2538.7 (19) Å 3 , the crystal is grown using cosolvent method, the powder frequency doubling effect is about 1.5-2 times of KDP (KH2PO4), has wide light transmission waveband, the crystal preparation method is simple, and the cost is low, the prepared crystal is large in mechanical hardness, easy to cut, polishing processing and preservation, the series of calcium halogenated borate nonlinear optical crystal described in the application has the advantages of stable physical and chemical properties, moderate mechanical hardness, not easy to break, easy to cut, polishing processing and preservation and the like.