74 results about "Lithium borate" patented technology

The invention relates to the technical field of battery management systems, in particular to a method for monitoring the health state of a mining emergency lithium battery pack, a battery cell electrolyte contains 0.08%-0.15% of nano cerium oxide, 0.15%-0.25% of lithium borate and 0.03%-0.08% of amino trimethylene phosphonic acid, and a diaphragm is coated with 0.8%-1.2% of a graphene-carbon nanotube-molybdenum sulfide composite coating. The method comprises the following steps: S1, deploying a multi-dimensional sensor, collecting voltage, current and other data, and dynamically adjusting the sampling frequency; s2, carrying out noise reduction, abnormal value elimination and interpolation completion on the data; s3, extracting characteristic parameters such as capacity attenuation rate; s4, detecting the content of POF3, and associating the capacity fading rate; s5, modeling by using an improved BP neural network, and outputting an SOH value; and S6, triggering grading early warning according to the SOH value and the POF3 content. According to the method, through material innovation and multi-dimensional monitoring, SOH evaluation precision is improved, faults are early warned in advance, environmental adaptability and safety prevention and control are enhanced, the defects of a traditional method are overcome, and mining emergency power supply safety is guaranteed.

The present application relates to the technical field of lithium ion battery cathode material, in particular to a kind of multi-element coated ternary cathode material and preparation method thereof.The present application provides a kind of multi-element coated ternary cathode material, the ternary cathode material includes lithium nickel cobalt manganese oxide ternary cathode material and the lithium niobium tungsten borate coating material attached to its surface, wherein the chemical composition general formula of the lithium niobium tungsten borate coating material is LiNb 1‑6x / 5‑3y / 5 W x B y O3, 0 The mass of the lithium niobium tungsten borate coating material is 0.02%~0.4% of the mass of the lithium nickel cobalt manganese oxide ternary cathode material.The coulomb efficiency of the ternary cathode material provided by the present application can reach 98.2%, the 100 cycle capacity retention rate can reach 88.4%, and the reversible capacity can reach 182mAh / g.Furthermore, the preparation process of the ternary cathode material is simple, the production cost is low, and it is suitable for mass production.

This invention discloses an electrolyte, battery, battery pack, and battery system for a lithium (sodium) ion battery, comprising an ionic electrolyte containing lithium borate ester (sodium salt) or lithium imine ester (sodium salt); an isoelectric point solvent of triethylamine ester, triethanolamine ester, borate ester, or phosphate ester; electrolyte 20%–50%, solvent 50%–80%. The ionic electrolyte developed in this invention is an organic compound with no ignition point and high safety, and can be used under operating conditions with voltages greater than 5 volts. The voltage of a typical lithium-ion battery is 3.4 volts. Furthermore, the electrolyte used in this invention is used in very small quantities, thus reducing overall cost and resulting in higher economic benefits. The zwitterionic polar solvent of this invention separates molecules into ions based on the charge carried by the material molecules. Due to its isoelectric point, it provides fast charging and discharging capabilities, increasing the ion transfer rate by 2-3 times or more than that of typical carbonate solvents.

The invention discloses a method for rapidly and accurately determining multiple elements of limestone powder based on a fuse piece method, and belongs to the technical field of material detection. A fuse piece scheme is designed aiming at the characteristics of fine particles, easy moisture absorption and the like of limestone powder instead of improving a general scheme of materials such as limestone, dolomite and the like, key parameters are optimized, the flux ratio is set as follows: the ratio of lithium tetraborate to lithium metaborate is 67: 33, melting is divided into three processes of preheating, pre-oxidation and melting, the melting temperature is effectively controlled to be 1060 DEG C, the time is 60 seconds, and the melting efficiency is greatly improved. The problem that limestone powder is prone to excessive melting or uneven melting is solved, the matrix effect and the particle size effect are greatly reduced, it is verified that three limestone powder standard samples with known components are selected for testing, the relative error between the result and the standard value is smaller than 1%, data meet the strict allowance requirement of the industry, and compared with an existing fuse piece method, the method has the advantage that the cost is low. The detection adaptability to the limestone powder is remarkably improved, and the component detection requirements of mainstream limestone powder in the industry can be met.

An electrolyte, a lithium secondary battery and a power utilization device, the electrolyte comprising a first solvent, a silane compound containing a carbon-carbon double bond and a cyclic lithium borate compound, the first solvent comprising a cyclic carbonate compound; wherein the mass content W3 of the cyclic carbonate compound, the mass content W1 of the silane compound containing a carbon-carbon double bond and the mass content W2 of the cyclic lithium borate compound satisfy: 0.001≤(W1+W2) / W3≤2.67 based on the total mass of the electrolyte. The combination of the silane compound containing a carbon-carbon double bond and the cyclic lithium borate compound can improve the flexibility and thermal stability of the SEI film, thereby reducing the gas generation degree during the cycle and storage of the lithium secondary battery, and improving the storage performance, fast charging performance and cycle performance of the lithium secondary battery.

The invention discloses a method for detecting silicon dioxide, calcium oxide and magnesium oxide in fly ash, which comprises the following steps: firing the fly ash at a certain temperature for a certain time, weighing a certain amount of fired sample, preparing a glass sheet by using lithium tetraborate-lithium metaborate as a flux and ammonium iodide as a release agent in a melting furnace at a certain temperature for a certain time, and then sintering the glass sheet in a sintering furnace at a certain temperature for a certain time. The X-ray fluorescence intensity of silicon, calcium and magnesium is determined through an X-ray fluorescence spectrometer, so that the determination of silicon dioxide, calcium oxide and magnesium oxide is completed. The method is simple to operate, high in analysis speed, accurate in result and easy to master.

The invention discloses a method for detecting the content of each element in slag. The method comprises the following steps: 1) pre-melting a sample; 2) manufacturing a glass sheet; (3) carrying out spectrum detection on the glass sheet prepared in the step (2) by utilizing a fluorescence spectrophotometer; wherein in the step 1), a mixed flux of lithium tetraborate and lithium metaborate and sodium nitrate are used for pre-melting treatment of a sample, and a sample melt is obtained; in the step (2), a mixed flux of lithium tetraborate and lithium metaborate is used for conducting melting treatment on the sample melt again, and the glass sheet is obtained.By means of the method, determination of CaO, SiO2, MgO, Al2O3, MnO, TiO2 and P2O5 in the furnace slag can be completed at the same time.

The invention belongs to the technical field of analysis and detection, and relates to a method for detecting the content of CaO, SiO2 and total Al in a slag pressing agent containing elemental aluminum. Comprising the following steps: S1, crushing a sample, uniformly mixing the sample, raising the temperature of a high-temperature furnace to 850 DEG C, and setting X fluorescence parameters; s2, pre-oxidizing the sample: putting a to-be-detected slag pressing agent sample containing elemental aluminum into a platinum gold crucible with a wall hung by using a mixed flux of lithium tetraborate and lithium metaborate; weighing lithium carbonate; uniformly mixing, and pre-oxidizing in a high-temperature furnace at 850 DEG C; s3, sample melting: taking out the pre-oxidized sheet and placing the pre-oxidized sheet in a 1050 DEG C sample melting furnace; melting is conducted for 15 min; performing mold reversing and sheet forming; s4, X fluorescence detection: putting the fuse piece sample into a spectrograph for detection, and giving a sample result; s5, sample detection is finished, whether a detection result between the parallel samples exceeds an allowable error range or not is judged, and an average result is calculated. The method solves the problem that X-fluorescence spectrum fuse piece analysis cannot be realized at present.

The invention relates to the field of machine manufacturing, and particularly discloses a metal-based ceramic bond diamond grinding wheel and a preparation method thereof.The metal-based ceramic bond diamond grinding wheel comprises the following raw materials of a diamond grinding material, a reinforcing phase and a composite bond; wherein carbon fibers are selected as the reinforcing phase, the composite binding agent comprises a metal binding agent and the balance of ceramic binding agent, and the ceramic binding agent comprises the following raw materials of calcium fluoride, aluminum fluoride, lithium borate, boric acid and the balance of silicon dioxide; the preparation method comprises the following steps: S1, premixing the diamond grinding material and the reinforcing phase, then adding the composite binding agent, spraying a polyvinyl alcohol solution after mixing, and mixing and granulating to obtain granules; s2, the granules are loaded into a mold to be subjected to hot press molding to obtain a grinding wheel blank; and S3, sintering the grinding wheel blank at high temperature to obtain the metal-based ceramic bond diamond grinding wheel. The emery grinding wheel has the advantages that the abrasion resistance and the impact resistance of the grinding wheel are improved, and then the service life of the emery grinding wheel is prolonged.

An object of the present invention is to provide a lithium-based solid electrolyte having excellent ion conductivity, a method for producing a lithium-based solid electrolyte, a modified positive electrode active material, a modified negative electrode active material, an all-solid-state secondary battery, an electrode sheet for an all-solid-state secondary battery, a solid electrolyte sheet, and an electrode for an all-solid-state secondary battery.The lithium-based solid electrolyte of the present invention contains amorphous lithium tetraborate, water, and a lithium salt, in which a content of the water is 45% by mass or less with respect to a total mass of the lithium-based solid electrolyte.

The present invention relates to a positive electrode slurry for a lithium secondary battery, which includes a positive electrode active material including a lithium nickel-based oxide having a composition in which the nickel content of all metals other than lithium is 50 mol % or more and which is in the form of at least one of single particles or pseudo-single particles, which are secondary particles formed by agglomeration of 30 or less primary particles; a lithium borate-based compound; a binder; a conductive material; and a solvent; a positive electrode for a lithium secondary battery, which includes a positive electrode active material layer formed by coating at least one surface of a positive electrode current collector with the positive electrode slurry; a method for manufacturing the positive electrode; and a lithium secondary battery including the positive electrode.

The invention discloses a sulfide-based composite solid electrolyte membrane as well as a full-dry preparation method and application thereof, and the method comprises the following steps: (1) forming a lithium borate coating layer on the surface of a sulfide electrolyte by adopting an atomic layer deposition process to obtain coated powder; (2) adsorbing vinyl-containing ionic liquid steam by the coated powder to obtain adsorbed powder; (3) ball-milling and mixing the adsorbed powder, a fluorine-containing polymer binder and a photoinitiator to obtain mixed powder; and (4) maintaining the pressure of the mixed powder, and performing double-sided irradiation with ultraviolet light to obtain the sulfide-based composite solid electrolyte membrane. The sulfide electrolyte is subjected to surface coating through atomic layer deposition, and the full-dry preparation of the sulfide-based composite solid electrolyte membrane is realized on the premise of avoiding solvent contact in combination with gas phase adsorption polymerization and a hot pressing-ultraviolet synergistic curing process.

The present disclosure relates to an electrolyte suitable for a lithium primary battery. In order to solve the problems of poor safety performance, high-rate discharge and poor discharge performance of electrolytes of the existing lithium primary batteries under a high-temperature condition, the electrolyte includes an electrolyte lithium salt, an additive, and an organic solvent, wherein the electrolyte lithium salt includes one or more of lithium trifluoromethanesulfonate, lithium bis(triflu-oromethanesulphonyl)imide, lithium difluorophosphate, and lithium difluoro(oxalato)borate; the additive includes one or more of (2-trimethylsilylethyl)2-cyanoacetate, diphenyldimethoxysilane, and citraconic anhydride; and the organic solvent comprises a carbon-ate solvent and a glycol ether solvent. A selective combination of the electrolyte lithium salt, the additive, and the solvent, normal-temperature discharge can be met when the electrolyte is applied to the lithium primary battery. The lithium primary battery can take into account the constant / high temperature performance, high-rate discharge performance and safety performance.

The invention relates to a high-voltage stable electrolyte and application thereof in a lithium ion battery. The electrolyte is synergistically formed by a solvent system and a double-salt system, wherein the solvent system is composed of aliphatic linear carbonate, a sulfone solvent and fluoro cyclic carbonate, and the double-salt system is composed of lithium hexafluorophosphate and lithium borate auxiliary salt. The combination can construct a unique lithium ion solvation sheath structure in an electrolyte, so that an interface reaction path can be accurately regulated and controlled, a film-forming additive is selectively guided to construct an interface film with high stability and flexibility on the surface of an electrode, and meanwhile, harmful decomposition of a solvent is inhibited. On the basis, the electrolyte achieves oxidation stability not lower than 5.2 V, is compatible with a high-voltage positive electrode and a high-capacity silicon-based negative electrode at the same time, effectively solves the technical problem that the high-voltage positive electrode and the high-capacity silicon-based negative electrode are difficult to be compatible, and shows excellent comprehensive cycle performance.

A battery that may be exposed to high temperatures such as when steam sterilizing that retains its capacity and power delivery is comprised of a cathode comprised of lithium metal phosphate, an anode comprised of lithium titanate, a separator comprising a material having a melt temperature of at least 150° C. and an electrolyte comprising a low boiling point solvent, a high boiling point solvent and a salt, the salt being comprised of a sulfur containing salt (e.g. lithium bis(trifluoromethanesulfonimide) and a lithium borate salt (e.g., lithium bis(oxalato)borate), by weight, wherein the sulfur containing salt is a majority of the salt present in the electrolyte. Desirably, the low boiling point solvent is comprised of a linear ester and the high boiling point solvent is comprised of a cyclic ester.

The invention relates to the field of glass production, in particular to an ICP (inductively coupled plasma)-based carbonate main component and trace element synchronous detection method, which comprises the following steps: S1, sample pretreatment: grinding a sample, and melting and digesting with a lithium tetraborate-lithium metaborate mixed solvent to obtain mother liquor; s2, gradient dilution, wherein the concentration of microelements in the mother liquor is kept at 0.01-1 ppm; 1 ml of mother liquor is taken and diluted by 100-200 times, and sub-liquor is obtained; preparing at least five groups of concentration gradient test curve ranges by using a full-element standard solution; s3, ICP (Inductively Coupled Plasma) detection: detecting main components, adding a Y internal standard solution into a sub-solution, correcting the solution concentration and atomization efficiency fluctuation, selecting a vertical test, and detecting the concentrations of Ca and Mg; and trace element detection: selecting a horizontal test during the test, and detecting the concentrations of Li, Zr and Nb. According to the method, the problem of detection deviation caused by carbonate and silicate residues is avoided, the Y internal standard is added during detection to correct instrument fluctuation, the matrix interference problem of traditional ICP detection is solved, the detection efficiency and precision are improved, the cost is reduced, and the application range is wide.

The invention discloses a low-dielectric-loss chip packaging glass substrate and a preparation method thereof, and relates to the technical field of glass manufacturing. The chip packaging glass substrate is prepared from the following raw materials: silicon dioxide, boric oxide, zirconium dioxide, germanium dioxide, aluminum oxide, gadolinium oxide, a composite fluxing component and a low-loss dielectric functional component, the composite fluxing component is prepared from the following raw materials: magnesium fluoride, lithium metaborate and strontium fluoride; the low-loss dielectric functional component is prepared from the following raw materials: silicon nitride, boron nitride micro powder and a coupling agent solution. The preparation method of the chip packaging glass substrate comprises the following steps: preparing the composite fluxing component, preparing the low-loss dielectric functional component, forming the glass substrate, and preparing the chip packaging glass substrate. The prepared chip packaging glass substrate is low in dielectric loss and excellent in mechanical property.

The invention discloses a negative pole piece and a lithium secondary battery comprising the same, and belongs to the technical field of lithium batteries, the negative pole piece comprises a negative base pole piece and an artificial SEI layer located on the surface of the negative base pole piece; the artificial SEI layer comprises lithium fluoride, a boron-containing inorganic phase and a phosphorus-containing inorganic phase, the boron-containing inorganic phase is selected from lithium borate and the like, and the phosphorus-containing inorganic phase is selected from lithium phosphate and the like; the average thickness of the artificial SEI layer is 6 to 12 nm; the preparation method comprises the steps of slurry coating and densification treatment in an inert atmosphere, through the synergistic effect of high stability of LiF, high ionic conductivity of a phosphorus-containing phase and high mechanical toughness and film-forming property of a boron-containing phase, and in cooperation with a unique densification process, the problems that a traditional artificial film layer is prone to falling off, high in impedance and the like are effectively solved, and the preparation method is suitable for large-scale production. The interface side reaction and the material volume expansion are obviously inhibited, and the cycle life, the storage performance and the rate capability of the lithium secondary battery are greatly improved.

Disclosed are cathode active material (CAM) coated with a lithium carbonate doped with lithium borate with a formula of Li2+xC1−xBxO3 wherein 0<x<0.5 and a preparation method therefor. Also disclosed is a cathode layer comprising the coated CAM in the form of particles. In one embodiment, an all-solid-state battery comprising the cathode layer exhibits improved stability and cycling performance.

The invention provides a lithium ion battery electrolyte and application thereof, the lithium ion battery electrolyte at least comprises fluorocarboxylate, a first additive and a second additive, the first additive comprises lithium difluoro (1, 2-dihydroxy ethane-1, 1, 2, 2-tetracyano) borate, and the second additive comprises tris (trimethylsilyl) phosphate. According to the lithium ion battery electrolyte and the application thereof provided by the invention, the high-voltage phase change of a positive electrode active material and the continuous oxygenolysis of the electrolyte under high voltage can be effectively inhibited, and the design of high-voltage-resistant and corrosion-resistant fast-charging electrolyte is realized.

The invention discloses a red mud-based pneumatic silencer and a preparation method thereof, the method takes red mud, waste aluminum oxide ceramic substrate powder, waste glass powder and other industrial solid wastes as raw materials, and the high-performance pneumatic silencer is prepared through the processes of mixing, burdening, grinding and powdering, melting, atomizing and balling and sinter molding. The preparation method comprises the following specific steps: mixing 20-50 parts of red mud, 10-30 parts of waste aluminum oxide ceramic substrate powder, 1-7 parts of lithium tetraborate, 1-3 parts of lithium metaborate, 5-15 parts of waste glass powder, 5-15 parts of quartz sand and 10-20 parts of kaolin, and grinding until the 325-micron screen residue is less than 1%; melting at the temperature of between 1,300 and 1,700 DEG C; carrying out atomization under the pressure of 0.5-2.0 MPa, and preparing 18-88 [mu] m glass spheres at the cooling rate of 100-500 DEG C / s; and sintering at the temperature of 1000-1200 DEG C for 1-3 hours. The prepared silencer has a communicated pore structure, the silencing capacity reaches 21-30dB (A), the silencer is not damaged under the radial load of 260-350N, and meanwhile, the silencer has excellent acid and alkali corrosion resistance and high-temperature stability. High-value utilization of industrial solid waste is achieved, and the problems that a traditional metal silencer is prone to corrosion and short in service life are solved.

The present invention relates to catalyst systems, methods and compositions, and more particularly, to catalyst systems, methods and compositions for the cationic polymerization of norbornene. A composition comprises the catalytic polymerization reaction product of: a 5-ethylidene-2-norbornene (ENB) monomer; a catalyst trimethylchlorosilane; a cocatalyst is a lithium tetrakis (pentafluorophenyl) borate diethyl ether compound; and optionally a polar solvent, thereby producing a 5-ethylidene-2-norbornene polymer (poly ENB).

The invention relates to the technical field of lithium ion batteries, and discloses a silicon-carbon negative electrode material with a multi-element structural design and a preparation method thereof, particles of the silicon-carbon negative electrode material are of a core-shell structure composed of an inner core, a middle layer and a shell, the inner core is metal-doped micron-sized porous silicon, the middle layer is lithium borate, the shell is a carbon layer, and the carbon layer is a silicon-carbon composite material. The mass ratio of the metal to the lithium borate to the carbon layer to the porous silicon is (0.05-0.5): (1-3): (10-20): 100. The multi-element structure design can effectively inhibit the volume expansion of silicon, and improve the first coulombic efficiency and cycle stability of the battery.

The invention belongs to the technical field of ceramic sand preparation, and particularly relates to ceramic polishing sand and a preparation method thereof. The ceramic polishing sand is prepared from the following raw materials: zirconium oxide, white corundum, flint clay, lithium tetraborate, niobium pentoxide, strontium zirconate, cerium hexaboride, nano magnesium oxide, a binder and a dispersant. According to the ceramic polishing sand, zirconium oxide serves as a main crystalline phase, basic hardness and abrasion resistance are provided for the ceramic polishing sand, and the hardness and cutting performance of the ceramic polishing sand are further enhanced through white corundum; a mixture of flint clay, lithium tetraborate, niobium pentoxide, strontium zirconate, cerium hexaboride and nano magnesium oxide is used as a ceramic modifier, so that the compactness and mechanical strength of the ceramic polishing sand are improved and the sintering temperature is reduced in the sintering process. In addition, the binder and the dispersant are added, and the raw materials have a synergistic effect, so that the prepared ceramic polishing sand has excellent fracture toughness, single-particle compressive strength and Vickers hardness.

The invention discloses a method for identifying composite lithium salt in a lithium battery electrolyte containing lithium oxalato borate. The method comprises the following steps: firstly, carrying out ion chromatography test on the electrolyte to be tested to obtain the type and content of conventional lithium salt and the total peak area of the lithium oxalato borate; then carrying out 400M nuclear magnetic resonance boron spectrum test, accurately identifying various types of oxalic acid-containing lithium borate salts, and obtaining the peak area proportion of hydrolyzed lithium salt products possibly existing in the oxalic acid-containing lithium borate salts and generated by part of easily-hydrolyzed lithium salts in the ion chromatography test; and finally, correcting and redistributing the total peak area measured by the ion chromatography according to the proportion, so as to calculate the accurate contents of various products containing the lithium oxalylborate and the hydrolyzed lithium salt of the lithium oxalylborate. The method effectively solves the problems that the traditional ion chromatography cannot distinguish the oxalic acid-containing lithium borate with similar structures and the quantification is interfered by hydrolysis, realizes the accurate qualitative and quantitative analysis of the composite lithium salt in the electrolyte, and provides reliable technical support for the research and development and quality control of the electrolyte.

Method of manufacturing lithium trifluoro(nitrato) borate as an additive for lithium-ion secondary cells, including, a) at room temperature, adding boron trifluoride complex dropwise to a solution of lithium nitrate in methanol to form a first solution, stirring the first solution overnight and removing volatile solvents in vacuo to obtain a first solid product; b) dissolving the first solid product in ester solvent, adding toluene to form a second solution, stirring the second solution overnight to obtain a white precipitate; c) decanting solvents in the second solution, drying the white precipitate in vacuo to obtain lithium trifluoro(nitrato) borate as the additive for lithium-ion secondary cells. Further disclosed is an electrolyte containing the above prepared lithium trifluoro(nitrato) borate and lithium-ion secondary cells using the electrolytes. The addition lithium trifluoro(nitrato) borate in the electrolytes may, for example, improve specific capacity of the cell and maintain an efficiency of over 85% after 100 cycles.

The invention discloses a method for analyzing a refractory material by a rapid glass melting method-inductively coupled plasma atomic emission spectrometry, which comprises the following steps of: preparing a lithium tetraborate-lithium metaborate protective film in a platinum yellow crucible, preparing a standard quality control sample into a molten glass sheet, and dissolving into a to-be-tested solution; determining the content of components in the quality control sample by inductively coupled plasma atomic emission spectrometry, and drawing a working curve; and then measuring the component content in the refractory material sample to be measured, and measuring data by using the same processes of manufacturing the melt sheet, dissolving the melt sheet, filtering the sample to be measured and using the inductively coupled plasma atomic emission spectrometry. According to the method, the rapid analysis of SiO2, Al2O3, CaO, Fe2O3, TiO2, K2O, MnO, MgO, P2O5, Na2O, Cr2O3 and ZrO2 in the refractory material can be completed at the same time, and the detection time is shortened.

The application discloses a sulfide-based composite solid electrolyte film and a full-dry method for preparing the same and application thereof, and comprises the following steps: (1) forming a lithium borate coating layer on the surface of a sulfide electrolyte by adopting an atomic layer deposition process to obtain coated powder; (2) adsorbing ion liquid vapor containing ethylene groups on the coated powder to obtain adsorbed powder; (3) ball-milling and mixing the adsorbed powder, a fluorine-containing polymer binder and a photoinitiator to obtain mixed powder; and (4) irradiating the mixed powder with ultraviolet light on both sides after pressure preservation to obtain the sulfide-based composite solid electrolyte film. The sulfide electrolyte is coated on the surface by adopting the atomic layer deposition process, and a gas phase adsorption polymerization and hot-pressing-ultraviolet synergistic curing process are combined to realize the full-dry preparation of the sulfide-based composite solid electrolyte film on the premise of avoiding solvent contact.

The invention relates to the technical field of chemical synthesis, and particularly discloses a preparation method of lithium bis (oxalato) borate. The preparation method of lithium bis (oxalato) borate provided by the invention comprises the following steps: (1) uniformly mixing oxalic acid, a lithium source and an aprotic polar solvent, and controlling the temperature to be 20-40 DEG C during the period; then adding diboron trioxide, heating to reflux for water separation, and after the reaction is finished, cooling, filtering, leaching and drying to obtain a crude product; adding the crude product into a crystallization solvent, heating to 55-65 DEG C for dissolving, then cooling to 10-15 DEG C for devitrification, and filtering and drying to obtain a refined product. The novel process for preparing lithium bis (oxalato) borate, provided by the invention, has the advantages of high raw material conversion rate, less generated water and no corrosive gas, and is suitable for industrial production.

The invention belongs to the field of non-aqueous lithium oxygen batteries, and discloses a heme-based nano-enzyme and boric acid additive electrolyte and preparation and application thereof. The electrolyte comprises a common electrolyte and a functional additive, wherein the functional additive comprises a heme-based nano enzyme and boric acid. According to the invention, the heme-based nano-enzyme is used for accelerating the redox reaction by removing superoxide anions, so that the discharge capacity of the Li-O2 battery is improved by 67%, and the cycle life is prolonged by nearly 40 circles. Secondly, boric acid is added to promote formation of an SEI layer containing lithium borate, so that the cycle life of the Li-O2 battery containing the nano-enzyme is prolonged by 60 circles, and the deep discharge capacity is improved by 51%. And the two are combined to realize collaborative optimization of cathode catalysis-anode protection, so that the Li-O2 battery is promoted to be practical.