182 results about "Lithium borate" patented technology

A non-aqueous electrolyte for a lithium-ion cell includes a base electrolyte consisting of lithium hexafluorophosphate or lithium bis(fluorosulfonyl)imide or a combination thereof in methyl propionate; about 2 to about 15 parts by weight, preferably about 6 to about 15 parts by weight of vinylene carbonate; and about 0.5 to about 5 parts by weight, preferably about 2 to about 5 parts by weight of an additive comprising lithium difluorophosphate, lithium difluoro(oxalate)borate, lithium bis(oxalate)borate, or a combination thereof, wherein the content of the vinylene carbonate and the additive are each based on a total weight of the base electrolyte, the vinylene carbonate, and the additives.

The invention discloses a battery monomer, a battery device and electric equipment, the battery monomer comprises a positive pole piece, the positive pole piece comprises a positive pole film layer, and the positive pole film layer comprises a lithium iron phosphate material and a lithium supplement agent; the negative electrode plate comprises a negative electrode film layer, the negative electrode film layer comprises a negative electrode active material, and the negative electrode active material comprises graphite; the isolating membrane is positioned between the positive pole piece and the negative pole piece; the electrolyte comprises lithium salts, the lithium salts comprise an organic lithium salt and an inorganic lithium salt, the organic lithium salt comprises at least one of fluorine-containing lithium sulfimide, fluorine-containing lithium oxalato borate and fluorine-containing lithium oxalato phosphate, the inorganic lithium salt comprises at least one of lithium hexafluorophosphate, lithium tetrafluoroborate and lithium fluorosulfonate, and the organic lithium salt comprises at least one of fluorine-containing lithium sulfimide, fluorine-containing lithium oxalato borate and fluorine-containing lithium oxalato phosphate. The mass ratio of the inorganic lithium salt to the organic lithium salt is (6-2): 1. As a result, a battery cell having both a long life and high power is obtained.

The invention discloses high-toughness ultrathin flexible glass and a preparation method thereof, and relates to the technical field of glass manufacturing. The ultrathin flexible glass is prepared from the following raw materials: silicon dioxide, aluminum oxide, lithium oxide, sodium oxide, magnesium oxide, a modified nano reinforced phase, a high-temperature melting regulator and cerium dioxide. The modified nano reinforced phase is prepared by the following steps: pre-treating silicon carbide and silicon nitride with hydrochloric acid, and mixing with nano zirconium oxide to obtain a mixture; and modifying the mixture with a silane coupling agent to obtain the modified nano reinforced phase. The high-temperature melting regulator is a mixture of lithium borate, sodium sulfate and lithium fluoride. The preparation method of the ultra-thin flexible glass comprises the following steps: preparing the modified nano reinforced phase, melting and homogenizing the glass, forming the glass substrate, and preparing the ultra-thin flexible glass. The ultra-thin flexible glass prepared by the invention has relatively high fracture toughness and structural rigidity, excellent flexibility and bending fatigue durability, and excellent thermal shock resistance.

The present invention relates to the field of battery materials, and provides a lithium manganate cathode material coated with lithium triborate and a preparation method thereof. The cathode material is a porous lithium manganate / lithium triborate composite electrode material, which includes porous lithium manganate with a highly connected directional columnar pore structure and a lithium triborate coating covering the pore surface, with a mass ratio of (86.0~92.0):(8.0~14.0), a coating thickness of 600~800 nm, a pore diameter of 45~95 μm, and a porosity of 65~78%. The preparation method includes: preparing a precursor colloidal solution by the sol-gel method, obtaining porous lithium manganate through low-temperature freezing molding and freeze-drying, and forming a cathode substrate through pre-oxidation and high-temperature sintering; subsequently, using vacuum-assisted impregnation, ultrasound, and nitrogen pressure to promote the penetration of the lithium triborate precursor solution, and forming a uniform coating layer through gradient drying and annealing treatment. The present invention significantly improves the crystal structure stability of the cathode material, inhibits manganese dissolution, improves the cycle life and rate performance, and has wide application value.

The invention provides an oxide solid electrolyte material and a preparation method and application thereof, and relates to the technical field of electrolyte material preparation, the preparation method comprises the following steps: 1) preparing pure-phase lithium borate from BLiO2, Li2O and B4Li2O7 according to a certain proportion under a certain condition; 2) mixing lithium borate with a zirconium source, a lithium source and a doping agent according to a certain proportion, and carrying out ball milling or wet ball milling / drying; 3) then tabletting, carrying out primary high-temperature solid-phase sintering, crushing and the like; and 4) finally, mixing and ball-milling the doped and modified LZBO and a coating agent, tabletting, and then carrying out secondary high-temperature solid-phase sintering, crushing and the like to obtain the LZBO material. Aiming at the defects of the traditional high-temperature solid-phase synthesis method, by innovating raw material combination and process steps, the reaction temperature is reduced, the product purity and the production efficiency are improved, and energy conservation and emission reduction are realized. According to the invention, the ionic conductivity, the compaction density, the battery rate, the cycle performance and the like are improved, and the application range is widened.

The invention discloses a special low-carbon fire-resistant quartziferous dry vibration material and a preparation method thereof, and relates to the technical field of fire-resistant materials. The special low-carbon fireproof quartzite dry vibration material comprises the following components in parts by weight: 70-80 parts of quartz aggregate, 20-30 parts of zirconia coated corundum micro powder, 3-6 parts of aluminum dihydrogen phosphate, 0.5-1 part of lithium borate and 0.5-1 part of yttrium oxide. The preparation method comprises the following steps: adding the quartz aggregate, the zirconia coated corundum micro powder, the dihydrogen phosphate, the lithium borate and the yttrium oxide into a mixer, and uniformly stirring to obtain the product. The quartziferous dry vibration material prepared by the invention has good thermal shock cycle resistance and low carbon content, and is green and environment-friendly.

The invention relates to a preparation method of a lanthanum-doped lithium borate coated LATP solid electrolyte, which comprises the following steps: S1, mixing a lithium source, an aluminum source, a lanthanum source, a titanium source and a phosphorus source, putting the mixed material into a dispersing agent, putting into a constant-temperature water bath stirrer, and heating and stirring until the mixture is completely dried to obtain a mixed raw material; s2, performing high-temperature primary sintering on the mixed raw material in an air atmosphere to obtain a composite oxide; s3, performing crushing treatment on a composite oxide, adding lithium borate, and performing uniform mixing to obtain a mixture; the mass ratio of the lithium-containing compound to the composite oxide is (0.01-0.05): 1; and S4, tabletting the mixture, and carrying out high-temperature secondary sintering in an air atmosphere to obtain the finished product lithium titanium aluminum phosphate material. The problems that in an existing scheme, the final calcination temperature of a solid electrolyte is generally up to 1100 DEG C or above, high energy consumption is likely to be caused, meanwhile, Li loss is caused, non-conductive AlPO4 is introduced, the crystal structure is unstable, the powder sintering performance is poor, and the ionic conductivity is reduced are solved.

The invention belongs to the technical field of chemical analysis, and particularly discloses a casting glass sheet method for quickly measuring potassium, sodium, silicon, calcium, magnesium, aluminum, titanium, sulfur and phosphorus in coal ash, which comprises the following steps: 1) preparing a sample casting glass sheet: putting a coal ash sample, anhydrous lithium tetraborate and lithium carbonate into a platinum crucible, uniformly mixing, dropwise adding an ammonium bromide solution, and stirring for 20-30 minutes; placing in an automatic sample melting machine to prepare a fuse piece, cooling, drying and storing for detection; and 2) XRF detection: constructing a standard working curve on an X-ray fluorescence spectrometer, and respectively testing the contents of potassium, sodium, silicon, calcium, magnesium, aluminum, titanium, sulfur and phosphorus in the sample casting glass sheet prepared in the step 1) by using the standard working curve. According to the method, borate high-temperature melting is adopted, so that the granularity effect, the mineral effect and the nonuniformity of the sample can be effectively eliminated, meanwhile, the absorption and enhancement effects among sample elements are well reduced, and the analysis precision and accuracy are improved.

The invention relates to the technical field of battery materials, and discloses a composite solid electrolyte diaphragm as well as a preparation method and application thereof. The composite solid electrolyte diaphragm comprises a base membrane and a solid electrolyte coating arranged on at least one surface of the base membrane, the solid electrolyte coating comprises an electrolyte I and an electrolyte II; the electrolyte I is lithium titanium aluminum phosphate and lithium lanthanum zirconium tantalum oxide; and the electrolyte II is a compound of lithium bis (oxalate) borate and acetamide in a molar ratio of 1: (6.5-7.5). The composite solid electrolyte diaphragm provided by the invention can realize relatively high ionic conductivity, and when the composite solid electrolyte diaphragm is used in a lithium ion battery, the battery can have relatively low internal resistance.

The invention discloses a secondary battery and an electric device, and belongs to the technical field of batteries. According to the secondary battery provided by the invention, the lithium supplement agent is introduced into the positive electrode active material layer, and the silane compound containing carbon-carbon double bonds and the cyclic lithium borate compound are added into the electrolyte; the non-Faraday capacitance of the positive pole piece, the mass percentage of the lithium supplement agent in the positive active material layer, the mass percentage of the silane compound containing the carbon-carbon double bond in the electrolyte and the mass percentage of the cyclic lithium borate compound in the electrolyte are reasonably controlled, so that the secondary battery meets the specific relational expression: (Cdl-0. 1) 2 * (A + B + 1) * 100 / N2 is greater than or equal to 10; therefore, excellent cycle performance, rate capability and safety performance of the secondary battery can be realized at the same time.

The invention specifically discloses a method for determining the content of chromium, silicon, phosphorus and titanium in high-carbon ferrochrome, which adopts a melting sample preparation-X fluorescence spectrometry method for determination, and comprises the following steps: (1) sample preparation: uniformly mixing a sample with lithium hydroxide, boron oxide, strontium nitrate and other oxidants, covering with lithium tetraborate, setting a melting procedure, and determining the content of chromium, silicon, phosphorus and titanium in the high-carbon ferrochrome by controlling the heating rate, segmentally controlling the temperature and preserving the heat; the full-automatic completion of pre-oxidation and melting can be realized, and the homogeneous glass fuse piece meeting the analysis requirement is obtained; (2) preparing a calibration working curve sample: selecting various national standard samples to establish a calibration working curve; and (3) determining by using an X-ray fluorescence spectrophotometer. According to the method provided by the invention, a flux crucible does not need to be additionally prepared for early-stage sample treatment, complete sample melting is ensured, the platinum-yellow crucible is prevented from being etched, the homogeneous glass fuse piece meeting the analysis requirement is obtained, and the precision and the accuracy of the result both meet the use requirement.

Provided herein is an electrolyte composition for a lithium-ion battery, the composition comprising: (a) 18-35 wt% of lithium salt; (b) 1-25 wt% of solvent additive; and (c) 45-80 wt% of solvent. The total amount of (a), (b) and (c) is less than or equal to 100 wt% of the electrolyte composition. The lithium salt comprises lithium bis(fluorosulfonyl)imide (LiFSI), lithium 4,5-dicyano-2-(trifluoromethyl)imidazole (LiTDI) and lithium difluoro(oxalato)borate (LiDFOB). The solvent additive comprises one or more fluorinated and / or unsaturated carbonate compounds. The solvent comprises a cyclic carbonate. Also provided is an electrochemical cell comprising the electrolyte composition, an electrochemical energy storage device comprising the electrochemical cell, and uses associated with the electrolyte composition.

The invention relates to a spherical boron-doped lithium iron phosphate positive electrode material preparation method, which comprises: S1, weighing iron phosphate, a lithium source and a carbon source according to a certain ratio, mixing, dispersing in a pure water medium, and sanding to obtain a slurry with a certain particle size distribution; s2, weighing a certain amount of lithium fluoroborate, adding the lithium fluoroborate into the slurry, controlling the temperature and stirring time of the slurry to hydrolyze the slurry, and uniformly doping boride and lithium fluoride obtained by hydrolysis into the slurry; and S3, carrying out spray drying and high-temperature sintering on the doped slurry to obtain the spherical boron-doped lithium iron phosphate. According to the invention, a product boride slowly hydrolyzed from fluorinated lithium borate is used as a boron source, fluoride is used as a fluxing agent, uniform doping of the boron source and regulation and control of the morphology of lithium iron phosphate particles are realized, and finally, the morphology of the lithium iron phosphate positive electrode material particles is regularly spherical and shows excellent electrochemical performance.

A battery that cycles lithium ions includes a negative electrode, a positive electrode spaced apart from the negative electrode, and a gel polymer electrolyte disposed between and configured to provide a medium for the conduction of lithium ions between the negative electrode and the positive electrode. The positive electrode includes a high-voltage electroactive material formulated to undergo lithium intercalation and deintercalation. The gel polymer electrolyte includes an aliphatic polyester, a lithium salt, and an ionic liquid. The aliphatic polyester includes a substituted or unsubstituted poly(ethylene carbonate) (PEC). The lithium salt includes lithium sulfonylimide, lithium borate, or a combination thereof. The ionic liquid includes substantially equimolar amounts of a cation and an anion, with the cation including a complex of lithium (Li+) and an ethylene glycol dimethyl ether, an imidazole ion, or a combination thereof, and the anion including a sulfinate ion, a borate ion, or a combination thereof.

The present invention relates to an all-solid-state battery positive electrode active material comprising an inner core of a lithium transition metal oxide; and a coating layer that is disposed on the inner core and contains a lithium boron oxide. The molar ratio of lithium to boron (Li: B) in the lithium boron oxide is 3: 7 to 3: 9.

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 invention relates to the field of energy storage, and provides a secondary battery and a preparation method thereof, an energy storage system and electric equipment, the secondary battery comprises a positive electrode current collector and a positive electrode active layer located on at least one surface of the positive electrode current collector; the positive electrode active layer internally comprises a carbon-coated composite material, the carbon-coated composite material comprises first lithium salt particles and second lithium salt particles which serve as inner cores, and the average particle size of the first lithium salt particles is larger than that of the second lithium salt particles; the first lithium salt particles and the second lithium salt particles are used for constructing a built-in electric field, and the built-in electric field is used for enabling electrons to flow from the second lithium salt particles to the first lithium salt particles; wherein the material of the first lithium salt particles comprises one or more of lithium manganese phosphate, lithium manganate or lithium vanadate; the material of the second lithium salt particles comprises one or more of lithium silicate or lithium borate; and the nitrogen-doped carbon layer is used as a carbon coating layer and is used for adsorbing lithium ions at the first voltage and releasing the lithium ions at the second voltage.

The invention discloses a preparation method of a cyanoborate lithium salt derivative, which comprises the following steps: 1, mixing an alcohol compound, a lithium source compound, a boron source compound and trimethylsilyl cyanide in a polar organic solvent, and filtering after complete reaction to obtain a cyanoborate crude product filtrate; the alcohol compound is selected from one of 2, 2, 2-trifluoroethanol, 2, 2-difluoroethanol, 2-fluoroethanol, 3-hydroxypropionitrile, allyl alcohol and propargyl alcohol; the lithium source compound is selected from one of lithium carbonate and lithium hydroxide; the boron source compound is selected from one of boric acid, diboron trioxide and boron tribromide; the reaction temperature is controlled to be 0-120 DEG C; and 2, adding an inert organic solvent into the cyanoborate crude product filtrate for crystallization, and performing vacuum drying to obtain a finished product of the cyanoborate lithium salt. The method has the advantages of high yield and purity, simple process, convenience in operation and low cost, and is extremely suitable for industrial production.

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.

The invention discloses an X-ray fluorescence spectrum detection method of metal manganese, which comprises the following specific steps: step 1, pre-oxidizing a series of standard samples of metal manganese and a sample to be detected, and melting at high temperature to prepare a uniform and smooth glass sheet; 2, measuring the X-ray fluorescence intensity of the to-be-measured element in the glass sheet prepared in the step 1 by using an X-ray fluorescence spectrometer, drawing a calibration curve of the to-be-measured element according to the X-ray fluorescence intensity of the to-be-measured element and the certificate value of the element in the standard sample, and calculating the X-ray fluorescence intensity of the to-be-measured element according to the calibration curve obtained in the step 2. And calculating the mass fractions of manganese, silicon, phosphorus, iron and other components in the metal manganese sample. The method comprises the following steps: dissolving, oxidizing and evaporating a manganese metal sample by using a dilute nitric acid solution, melting lithium tetraborate as a flux and cobalt as an internal standard element of manganese at high temperature by using a high-frequency melting furnace, and melting the sample and lithium tetraborate into a flat and smooth glass sample wafer, so that the glass sample wafer meets the analysis requirements of an X-fluorescence spectrophotometer and does not damage a platinum crucible.

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 main purpose of the present disclosure is to provide a positive electrode active material that can inhibit the reaction with a solid electrolyte. In the present disclosure, the above-mentioned problem is solved by providing the following coated active material, which has a positive electrode active material and a coating portion that covers at least a portion of the surface of the positive electrode active material, and the coating portion contains a lithium scandium phosphate compound or a lithium borate compound.

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 lithium ion battery negative electrode with long cycle life and high first efficiency and a preparation method thereof. The lithium ion battery negative electrode comprises a composite current collector, a silicon-carbon negative electrode active material coating coated on at least one surface of the composite current collector, and a lithium supplementing coating coated on the outer surface of the silicon-carbon negative electrode active material coating, the lithium supplementing coating comprises an inorganic lithium-containing compound, halloysite nanotube powder and lithium polyacrylate, and the mass part ratio of the inorganic lithium-containing compound to the halloysite nanotube powder to the lithium polyacrylate is (20-25): (65-75): (2-5); the inorganic lithium-containing compound is a mixture formed by lithium borate and lithium carbonate according to the mass ratio of (1-2): 1. Compared with the prior art, the lithium ion battery negative electrode provided by the invention has relatively high first efficiency, relatively long cycle life and relatively high safety performance.

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 discloses an iron-based composite lithium supplementing material which comprises a lithium-rich lithium ferrite matrix and a coating layer coating the lithium-rich lithium ferrite matrix, the coating layer sequentially comprises a first coating layer, a second coating layer and a third coating layer from inside to outside, the first coating layer is made of carbon, the second coating layer is made of carbon, and the third coating layer is made of carbon. The second coating layer comprises one or more of lithium borate, lithium tungstate and lithium silicate, and the third coating layer is carbon. The invention also provides a preparation method of the iron-based composite lithium supplementing material. According to the iron-based composite lithium supplementing material and the preparation method thereof, a fluorine-doped three-stage coating structure is adopted, the characteristic of high lithium supplementing capacity of lithium-rich lithium ferrite is fully played, the defects of poor intrinsic conductivity, high residual lithium, serious gas production, circulation deterioration and the like of the lithium-rich lithium ferrite are overcome, lower metal dissolution and lower gas production are realized, and the lithium supplementing capacity of the lithium-rich lithium ferrite is improved. And the capacity and the long-term cycle retention rate of the battery are further ensured.

A method for making fumed lithium borate, the method comprising: preparing a solution of a lithium precursor, preferably a lithium carboxylate containing 5 to 20 carbon atoms, and a boron source, preferably an organic boron compound, feeding the solution to a flame burning in a flame reaction zone to produce a fumed product comprising fumed lithium borate particles; and obtaining the fumed product.

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