WO2019104473A1 - 三元前驱体材料及其制备方法 - Google Patents
三元前驱体材料及其制备方法 Download PDFInfo
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Definitions
- the invention relates to a ternary precursor material for a lithium ion battery and a preparation method thereof.
- the ternary material is a layered nickel-cobalt-manganese composite cathode material, wherein the main metal elements are nickel, manganese and cobalt metals. Compared with lithium cobaltate, lithium nickelate and lithium manganate, it has the advantages of low cost, large discharge capacity, good cycle performance, good thermal stability and stable structure. Through the synergistic effect of Ni-Co-MN, the ternary material combines the good cycle performance of lithium cobaltate, the high specific capacity of lithium nickelate and the high safety and low cost of lithium manganate. The comprehensive performance is better than any single. The combination of compounds has become the most promising cathode material for lithium ion batteries.
- the ternary precursor material is the key raw material for the preparation of ternary materials.
- the physicochemical properties of the ternary precursor materials directly affect the electrochemical performance of the ternary materials, directly restricting the application of high-performance ternary materials, including ternary precursor morphology, particle size distribution, Crystal structure, etc.
- the current production process of ternary precursor materials is difficult to control its internal structure.
- the ternary materials prepared by conventional ternary precursor materials cannot meet the requirements of vehicle battery specifications.
- an object of the present invention is to provide a ternary precursor material that satisfies the requirements of a vehicle battery and has a structure controllable, a preparation method thereof, and a ternary material.
- a method for preparing a ternary precursor material includes the following steps:
- S1 weighing a nickel source, a cobalt source, and a manganese source in a predetermined ratio and dissolving in deionized water to form a first mixed solution, and causing nickel ions in the first mixed solution, a molar ratio of cobalt ions to manganese ions is a predetermined ratio;
- S2 a first mixed solution and a first strong alkali solution are added to the first reactor, and then a first complexing agent is added thereto, the first mixed solution and The hydroxide ions in the first reactor react to form a seed crystal;
- S3 the seed crystal obtained by the reaction in S2 is added to the second reactor, and then the second complexing agent, the nickel source, and the cobalt source are further
- a second mixed solution formed by dissolving the manganese source in deionized water and a second strong alkali solution are added to the second reactor to fully react and form a slurry having a precipitate, and controlling the solid content of the slurry is controlled Within the
- first reactor and the second reactor are large circulation flux reactors.
- step S1 the first complexing agent is continuously added to the first reactor at a predetermined speed, and the time for continuously adding the first complexing agent is between 1 and 24 hours.
- step S2 the pH in the first reactor is between 10.5-12.8, and the reaction temperature in the first reactor is between 40-80 °C.
- the seed crystal has a particle diameter of between 1 and 9 ⁇ m.
- step S3 the solid content in the slurry is between 700 and 1600 g/L.
- step S3 the pH in the second reactor is between 10.5-12.8.
- step S5 the drying temperature is between 270-350 ° C, and the drying time is between 1-4 hours.
- a ternary precursor material having a molecular formula of Ni x Co y Mn z (OH) 2 , wherein x+y+z 1, x, y, z ranges from 0 to 1, and x, y, z are not equal to 0 and 1,
- the ternary material precursor has a spherical structure, the spherical structure includes a shell, a core and a transition layer, the shell is a dense structure, and the core is loose a porous structure, the transition layer is disposed between the outer casing and the inner core, the ternary precursor material is a mixture of nickel hydroxide, cobalt hydroxide and manganese hydroxide mixed at an atomic level, and the outer shell is crystallized The degree is higher than the crystallinity of the core, and the transition layer has a crystallinity between the outer shell and the inner core.
- the D50 of the ternary precursor material is between 2-18 ⁇ m, and (D5+D95): D50 ⁇ 2.2.
- the outer casing has a thickness of between 0.5 and 10 ⁇ m
- the transition layer has a thickness of between 0 and 2 ⁇ m
- the inner core has a diameter of not more than 10 ⁇ m
- the outer casing has a tap density greater than The tap density of the core, wherein the shell has a tap density of not less than 2.5 g/cm 3 and the core has a tap density of not more than 3.0 g/cm 3 .
- the ratio of the diameter of the ternary precursor shell to the diameter of the inner core is between 1:1 and 9:1.
- the density of the core of the ternary precursor gradually increases from the inside to the outside.
- the pore diameter of the core of the ternary precursor is controlled to be between 0.1 and 2 ⁇ m.
- the porosity of the ternary material precursor material is controlled to be between 20 and 70%.
- FIG. 1 is a flow chart of a method for preparing a ternary precursor material provided by the present invention.
- FIG. 2 is a particle size distribution diagram of an embodiment of a ternary material precursor provided by the present invention.
- FIG. 3 is a microscopic appearance of an embodiment of a ternary material precursor provided by the present invention Figure.
- FIG. 4 is a cutaway view of the ternary precursor material of FIG. 3.
- FIG. 1 is a flow chart of a method for preparing a ternary precursor material provided by the present invention.
- the preparation method of the ternary precursor material comprises the following steps:
- the nickel source, the cobalt source, and the manganese source are all water-soluble salts.
- the nickel source may be a mixture of one or more of nickel sulfate, nickel nitrate, and nickel chloride
- the cobalt source may be one or more of cobalt sulfate, cobalt nitrate, and cobalt chloride.
- the mixture may be a mixture of one or more of manganese sulfate, manganese nitrate, and manganese chloride.
- the molar ratio of the nickel ion, the cobalt ion and the manganese ion in the first mixed solution can be adjusted accordingly according to actual needs, which is not limited in the present application.
- the first reactor is a reaction vessel.
- the first reactor is a large circulation flux reactor, and the circulation flux of the large circulation flux reactor is between 10-40 m 3 /h.
- the reaction vessel is an induced draft tube structure.
- the seed crystal reactor has an appropriate amount of a liquid inside thereof before the addition of the mixed solution.
- the bottom liquid is a blank bottom liquid, for example, the bottom liquid may be deionized water.
- the liquid level of the seed liquid in the seed reactor is 10 to 100 cm higher than the height of the feed port. In other words, the feed port of the seed reactor is located below the level of the bottom liquid in the seed reactor, thereby enabling rapid dispersion of the added solution in the seed reactor.
- the first mixed solution is added to the first reactor, and then the first complexing agent is continuously added to the first reactor at a predetermined rate.
- the first complexing agent is ammonia water, and the concentration of the ammonia water is gradually increased from 0 g/L to 45 g/L, and the time of continuously adding the ammonia water can be controlled between 1-24 hours.
- the first complexing agent may also be at least one of ammonium sulfate, EDTA (ethylenediaminetetraacetic acid), sodium hydrogencarbonate, and oxalic acid.
- the first mixed solution reacts with the first strong alkali solution and the ammonia water to form a precipitate, and the pH of the solid-liquid mixture in the first reactor is controlled to be between 10.5-12.8.
- the reaction temperature in the first reactor is controlled to be between 40 and 80 °C.
- the ratio of the number of moles of hydroxide ions in the first strong alkali solution to the number of moles of metal cations in the first mixed solution is between 0.5 and 2.8.
- the first strong alkali solution is one or two of sodium hydroxide or potassium hydroxide solutions.
- the nickel ions, cobalt ions, and manganese ions are combined with the first strong alkali solution and the hydroxide ions of the ammonia water to form a mixture of nickel hydroxide, cobalt hydroxide, and manganese hydroxide.
- the seed crystal is a particle formed from the mixture, the seed crystal having a particle size of between 1 and 9 ⁇ .
- the second reactor is also a large cycle flux reactor and is also an induced draft tube structure.
- a second complexing agent is added thereto and the concentration of the second complexing agent in the second reactor is controlled, and then The second mixed solution and the second strong alkaline solution are sequentially added to the second reactor to carry out a reaction, at which time a slurry having a precipitate is formed.
- the precipitation is formed by the seed crystal formed in step S2 and continues to grow in the second reactor.
- the second mixed solution is also formed by weighing the nickel source, the cobalt source, and the manganese source in a predetermined amount and dissolving in water.
- the type of the nickel source, the cobalt source, and the manganese source may be the same as or different from the types of the nickel source, the cobalt source, and the manganese source in the first mixed liquid, which is not limited by the present invention;
- the molar concentration of nickel ions, cobalt ions, and manganese ions in the second mixed solution may be exactly the same as the molar concentration of nickel ions, cobalt ions, and manganese ions in the first mixed solution, or may be different. The invention is not limited thereto.
- the second complexing agent may be at least one of ammonia water, ammonium sulfate, EDTA, sodium hydrogencarbonate, and oxalic acid. It can be understood that the second complexing agent may be the same as or different from the first complexing agent.
- the second complexing agent is aqueous ammonia. The ammonia water concentration is between 1.0 and 20.0%. The aqueous ammonia is continuously fed to the second reactor at a predetermined rate by a metering pump.
- the second complexing agent may also be other kinds of complexing agents, which are not limited in the present invention.
- the molar concentration of the cation in the second mixed solution is between 0.5 and 2.8 mol/L, the number of moles of the metal cation in the second mixed solution and the gold in the first mixed solution
- the ratio of moles of cations is between 0.4 and 1.5.
- the pH of the reaction environment is controlled to be between 10.5-12.8 in step S3.
- the nickel source, the cobalt source, and the manganese source in the second mixed solution may be the same as the nickel source, the cobalt source, and the manganese source in the first mixed solution, and may of course be different. There is no limit to this.
- the molar ratio of the nickel ion, the cobalt ion and the manganese ion in the second mixed solution can be adjusted accordingly according to actual needs, which is not limited in the present invention.
- the solid content in the slurry is controlled by means of filtration return.
- the solid content in the slurry is controlled to be between 700 and 1600 g/L by means of filtration return, and the time for filtration return is controlled between 1 and 12 h. That is, the precipitate therein is filtered by filtration and returned to the second reactor, and then the filtered liquid is drained.
- the reaction product obtained in the previous step to the aging tank, and adjusting the pH in the aging tank to be between 10-13 by adding a third lye solution, while unreacting in the solution by stirring
- the complete nickel ion, cobalt ion or manganese ion reacts sufficiently with the hydroxide ion in the reaction environment to form a precipitate.
- the solid precipitate in the aging tank is separated, that is, solid-liquid separation is performed. Further, the continuation of the reaction in the aging tank enables surface modification of the precipitate, thereby improving the performance of the finally obtained product.
- the solid precipitation is carried out by transferring the precipitate and liquid in the aging tank to a plate and frame filter press to separate the solid precipitate therein. The separated precipitate was then washed with deionized water to a pH of less than 8.
- the third lye solution is also one or both of sodium hydroxide or potassium hydroxide solution.
- the precipitate is an atomic-scale mixed mixture of the nickel hydroxide, cobalt hydroxide, and manganese hydroxide.
- the precipitate is dried in a rotary kiln in an oxygen-rich atmosphere, wherein the drying temperature is between 270 and 350 ° C and the drying time is between 1 and 4 hours.
- the porosity of the ternary precursor material is controlled between 20 and 70%, and the porosity of the ternary precursor material can be adjusted accordingly by adjusting the thickness ratio of the outer shell to the inner core.
- the pore size of the inner core of the ternary precursor material can be controlled between 0.1 and 2 ⁇ m.
- the ternary precursor material is a spheroidal structure comprising a shell, a transition layer, and an inner core surrounded by the outer shell.
- the outer casing is of a dense structure
- the inner core is a loose porous structure
- the transition layer is located between the outer casing and the inner core.
- the tap density of the outer casing, the transition layer and the inner core are different, the tap density of the outer shell is greater than the tap density of the inner core, and the tap density of the transition layer is smaller than that of the outer shell.
- the tap density is greater than the tap density of the core.
- the crystallinity of the outer shell is higher than the crystallinity of the transition layer, and the crystallinity of the transition layer is greater than the crystallinity of the inner core.
- the outer casing has a thickness of between 0.5 and 10 ⁇ m, and the outer casing has a density of not less than 2.5 g/cm 3 .
- the diameter and the tap density of the outer casing can be adjusted according to actual needs, and the present invention does not limit this.
- the ternary precursor material has a core diameter of not more than 10 ⁇ m and a density of not more than 3.0 g/cm 3 .
- the transition layer has a thickness between 0 and 2 ⁇ m.
- the ratio of the diameter of the outer shell of the ternary precursor material to the diameter of the inner core is between 1:1 and 1:9.
- the density of the inner core of the ternary precursor material gradually increases from the inside to the outside.
- the density of the inner core is a layered dense gradient distribution, and the layered dense gradient of the inner core is between 2.0 and 4.2 g/cm 3 .
- the ternary precursor material has a particle size of between 1 and 40 ⁇ m. Further, the D50 of the ternary precursor material is between 2-18 ⁇ m, and (D5+D95): D50 ⁇ 2.2.
- the D50 refers to the diameter value of the abscissa corresponding to the cumulative distribution of the ordinates of 50%.
- the D5 refers to the diameter value of the abscissa corresponding to the cumulative distribution of the ordinates of 5%
- the D95 refers to the diameter value of the abscissa corresponding to the cumulative distribution of the ordinates of 95%.
- the present application also provides a ternary material prepared by mixing the ternary precursor material and a lithium source and sintering at 700-1200 ° C under a pure oxygen or air atmosphere.
- the lithium source is one or more of lithium hydroxide, lithium nitrate, lithium sulfate, lithium chloride, lithium fluoride, lithium carbonate, and lithium oxalate.
- the ternary material may be doped with at least one metal cation of Al, Ca, Na, Ti, Mg, Zr, and W, or doped with at least one of S, Cl, and F.
- the capacity retention rate after charging and discharging at 20 C rate for 2000 weeks is not less than 88%, and has good rate performance.
- the preparation method of the ternary precursor material disclosed in the present application can control the morphology and particle diameter of the prepared ternary precursor material, and the method is simple and controllable, and is suitable for industrial production.
- the outer shell and the inner core of the ternary precursor material in the present application have different crystal strengths, and the ternary material prepared by using the ternary precursor material has better rate performance and good cycle stability performance, and is suitable as a vehicle power battery. use.
- the nickel source, the cobalt source, and the manganese source are weighed in a predetermined ratio and dissolved in deionized water to form a first mixed solution. And a molar ratio of the nickel ions, cobalt ions, and manganese ions in the first mixed solution is 5/2/3.
- the first mixed solution was fed to a first reactor which was a reaction vessel and had a circulation flux of 25 m 3 /h. Then, ammonia water and a first strong alkali solution are gradually added thereto at a constant rate, the concentration of the ammonia water is gradually increased from 0 g/L to 30 g/L, and the duration of the addition of the ammonia water is 12 hours; the first strong alkali solution
- the ratio of the number of moles of the hydroxide ion to the number of moles of the cation in the first mixed solution is 0.5, and the first strong alkali solution is a sodium hydroxide solution.
- the reaction temperature for controlling the reaction environment in the first reactor was 60 °C.
- the first mixed solution reacts with the hydroxide in the reaction environment to form a precipitate, and the precipitate is a seed crystal.
- the seed crystal has a particle size of between 1 and 7 ⁇ m.
- the second reactor was also a large recycle flux reactor with a recycle flux of 25 m 3 /h.
- the second complexing agent is ammonia water;
- the second strong alkali solution is a sodium hydroxide solution, and the number of moles of cations in the second mixed solution and the molar amount of hydroxide ions in the second strong alkali solution The ratio of the number is 1.
- the second mixed solution is also obtained by dissolving nickel nitrate, cobalt nitrate and manganese nitrate in deionized water, and the ratio of the molar concentration of the nickel ions, the cobalt ions and the manganese ions is 5/2/3.
- the second container has a PH value of between 10.5-12.8 during the reaction, and the solid content of the slurry is controlled to be 1000 g/L by means of filtration return;
- the precipitate obtained in the previous step was dried at 300 ° C for 3 hours in an oxygen-rich atmosphere to obtain a ternary precursor material.
- the precursor of the obtained ternary material had a D50 of 16 ⁇ m.
- the nickel source, the cobalt source, and the manganese source are weighed in a predetermined ratio and dissolved in deionized water to form a first mixed solution. And a molar ratio of the nickel ions, cobalt ions, and manganese ions in the first mixed solution is 3/3/3.
- the first mixed solution was fed to a first reactor which was a reaction vessel and had a circulation flux of 15 m 3 /h. Then, ammonia water and a first strong alkali solution are gradually added thereto at a constant rate, the concentration of the ammonia water is gradually increased from 0 g/L to 15 g/L, and the duration of the addition of the ammonia water is 24 hours; the first strong alkali solution
- the ratio of the number of moles of the hydroxide ion to the number of moles of the cation in the first mixed solution is 1, and the first strong alkali solution is a sodium hydroxide solution.
- the reaction temperature for controlling the reaction environment in the reaction vessel was 40 °C.
- the first mixed solution reacts with the hydroxide in the reaction environment to form a precipitate, and the precipitate is a seed crystal.
- the seed crystal has a particle size of between 3 and 9 ⁇ m.
- the second reactor was also a large recycle flux reactor with a recycle flux of 15 m 3 /h.
- the second complexing agent is ammonia water;
- the second strong alkali solution is a sodium hydroxide solution, and the number of moles of cations in the second mixed solution and the molar amount of hydroxide ions in the second strong alkali solution The ratio is 1.5.
- the second mixed solution is also obtained by dissolving nickel sulfate, cobalt sulfate and manganese manganese sulfate in deionized water, and the molar ratio of the nickel ions, the cobalt ions and the manganese ions is 3/3/3. .
- the second container has a pH value between 11-12 during the reaction, and the solid content of the slurry is controlled to be 700 g/L by means of filtration return;
- the precipitate obtained in the previous step was dried at 330 ° C for 3 hours in an oxygen-rich atmosphere to obtain a ternary precursor material.
- the precursor of the obtained ternary material had a D50 of 2 ⁇ m.
- the nickel source, the cobalt source, and the manganese source are weighed in a predetermined ratio and dissolved in deionized water to form a first mixed solution. And a ratio of molar concentrations of the nickel ions, cobalt ions, and manganese ions in the first mixed solution is 8/1/1.
- the first mixed solution was fed to a first reactor which was a reaction vessel and had a circulation flux of 40 m 3 /h. Then, ammonia water and a first strong alkali solution are gradually added thereto at a constant rate, the concentration of the ammonia water is gradually increased from 0 g/L to 45 g/L, and the duration of the addition of the ammonia water is 1 hour; the first strong alkali solution
- the ratio of the number of moles of the hydroxide ion to the number of moles of the cation in the first mixed solution is 1.5, and the first strong alkali solution is a sodium hydroxide solution.
- the reaction temperature for controlling the reaction environment in the first reactor was 80 °C.
- the first mixed solution reacts with the hydroxide in the reaction environment to form a precipitate, and the precipitate is a seed crystal.
- the seed crystal has a particle size of between 1 and 9 ⁇ m.
- the second reactor was also a large recycle flux reactor with a recycle flux of 40 m 3 /h.
- the second complexing agent is ammonia water;
- the second strong alkali solution is a sodium hydroxide solution, and the number of moles of cations in the second mixed solution and the molar amount of hydroxide ions in the second strong alkali solution The ratio of the number is 1.
- the second mixed solution is also obtained by dissolving nickel chloride, cobalt chloride and manganese chloride in deionized water, and the molar ratio of the nickel ions, the cobalt ions and the manganese ions is 8/1. /1.
- the pH of the second container during the reaction is between 10.5-11.5
- the solid content of the slurry is controlled to be 1600 g / L by means of filtration return;
- the precipitate obtained in the previous step was dried at 350 ° C for 3 hours in an oxygen-rich atmosphere to obtain a ternary precursor material.
- the precursor of the obtained ternary material had a D50 of 18 ⁇ m.
- the nickel source, the cobalt source, and the manganese source are weighed in a predetermined ratio and dissolved in deionized water to form a first mixed solution. And a ratio of molar concentrations of the nickel ions, cobalt ions, and manganese ions in the first mixed solution is 8/1/1.
- the first mixed solution was fed to a first reactor which was a reaction vessel and had a circulation flux of 30 m 3 /h. Then, ammonia water and a first strong alkali solution are gradually added thereto at a constant rate, the concentration of the ammonia water is gradually increased from 0 g/L to 40 g/L, and the duration of the addition of the ammonia water is 5 hours; the first strong alkali solution
- the ratio of the number of moles of the hydroxide ion to the number of moles of the cation in the first mixed solution is 0.5, and the first strong alkali solution is a sodium hydroxide solution.
- the pH of the reaction environment in the first reactor was controlled to be 12 while the reaction temperature in the reaction environment in the first reactor was controlled to be 70 °C.
- the first mixed solution reacts with the hydroxide in the reaction environment to form a precipitate, and the precipitate is a seed crystal.
- the seed crystal has a particle size of between 5 and 9 ⁇ m.
- the second reactor was also a large recycle flux reactor with a recycle flux of 30 m 3 /h.
- the second complexing agent is ammonia water;
- the second strong alkali solution is a sodium hydroxide solution, and the number of moles of cations in the second mixed solution and the molar amount of hydroxide ions in the second strong alkali solution The ratio is 0.8.
- the second mixed solution is also obtained by dissolving nickel sulfate, cobalt sulfate and manganese manganese sulfate in deionized water, and the molar concentration of the nickel ions, the cobalt ions and the manganese ions is only 8/1/1. .
- the second container has a pH value of between 11.5-12.8 during the reaction, and the solid content of the slurry is controlled to be 1200 g/L by means of filtration return;
- the precipitate obtained in the previous step was dried at 300 ° C for 3 hours in an oxygen-rich atmosphere to obtain a ternary precursor material.
- the precursor of the obtained ternary material had a D50 of 15 ⁇ m.
- the nickel source, the cobalt source, and the manganese source are weighed in a predetermined ratio and dissolved in deionized water to form a first mixed solution. And a ratio of molar concentrations of the nickel ions, cobalt ions, and manganese ions in the first mixed solution is 6/2/2.
- the first mixed solution was added to the reaction vessel, the first reactor was a reaction vessel and the circulation flux was 25 m 3 /h. Then, ammonia water and a first strong alkali solution are gradually added thereto at a constant rate, the concentration of the ammonia water is gradually increased from 0 g/L to 20 g/L, and the duration of the addition of the ammonia water is 20 hours; the first strong alkali solution
- the ratio of the number of moles of the hydroxide ion to the number of moles of the cation in the first mixed solution is 0.5, and the first strong alkali solution is a sodium hydroxide solution.
- the reaction temperature for controlling the reaction environment in the first reactor was 70 °C.
- the first mixed solution reacts with the hydroxide in the reaction environment to form a precipitate, and the precipitate is a seed crystal.
- the seed crystal has a particle size of between 1 and 9 ⁇ m.
- the second reactor was also a large recycle flux reactor with a recycle flux of 30 m 3 /h.
- the second complexing agent is ammonia water;
- the second strong alkali solution is a sodium hydroxide solution, and the number of moles of cations in the second mixed solution and the molar amount of hydroxide ions in the second strong alkali solution The ratio is 1.5.
- the second mixed solution is also obtained by dissolving nickel sulfate, cobalt sulfate and manganese manganese sulfate in deionized water, and the ratio of the molar concentration of the nickel ions, the cobalt ions and the manganese ions is 6/2/2 .
- the second container has a pH value of between 12 and 12.8 during the reaction, and the solid content of the slurry is controlled to be 900 g/L by means of filtration return;
- the precipitate obtained in the previous step was dried at 270 ° C for 3 hours in an oxygen-rich atmosphere to obtain a ternary precursor material.
- the precursor of the obtained ternary material had a D50 of 8 ⁇ m.
- the nickel source, the cobalt source, and the manganese source are weighed in a predetermined ratio and dissolved in deionized water to form a first mixed solution. And a ratio of molar concentrations of the nickel ions, cobalt ions, and manganese ions in the first mixed solution is 4/4/2.
- the first mixed solution was added to the reaction vessel, the first reactor was a reaction vessel and the circulation flux was 25 m 3 /h. Then, ammonia water and a first strong alkali solution are gradually added thereto at a constant rate, the concentration of the ammonia water is gradually increased from 0 g/L to 20 g/L, and the duration of the addition of the ammonia water is 20 hours; the first strong alkali solution
- the ratio of the number of moles of the hydroxide ion to the number of moles of the cation in the first mixed solution is 0.5, and the first strong alkali solution is a sodium hydroxide solution.
- the reaction temperature for controlling the reaction environment in the first reactor was 70 °C.
- the first mixed solution reacts with the hydroxide in the reaction environment to form a precipitate, and the precipitate is a seed crystal.
- the seed crystal has a particle size of between 1 and 9 ⁇ m.
- the second reactor was also a large recycle flux reactor with a recycle flux of 30 m 3 /h.
- the second complexing agent is ammonia water;
- the second strong alkali solution is a sodium hydroxide solution, and the number of moles of cations in the second mixed solution and the molar amount of hydroxide ions in the second strong alkali solution The ratio is 1.5.
- the second mixed solution is also obtained by dissolving nickel sulfate, cobalt sulfate and manganese manganese sulfate in deionized water, and the ratio of the molar concentration of the nickel ions, the cobalt ions and the manganese ions is 6/2/2 .
- the second container has a pH value of between 12 and 12.8 during the reaction, and the solid content of the slurry is controlled to be 900 g/L by means of filtration return;
- the precipitate obtained in the previous step was dried at 270 ° C for 3 hours in an oxygen-rich atmosphere to obtain a ternary precursor material.
- the precursor of the obtained ternary material had a D50 of 8 ⁇ m.
Abstract
Description
Claims (15)
- 一种三元前驱体材料的制备方法,包括如下步骤:S1,将镍源、钴源和锰源按照预定的比例进行称量并溶解于去离子水中形成第一混合溶液,并且使所述第一混合溶液中的镍离子、钴离子和锰离子的摩尔比为预定的比例;S2,第一混合溶液及第一强碱溶液加入到第一反应器中,然后向其中加入第一络合剂,所述第一混合溶液与第一反应器中的氢氧根离子反应生成晶种;S3,将在S2中反应得到的所述晶种加入第二反应器内,然后再将第二络合剂、由镍源、钴源和锰源溶解于去离子水中形成的第二混合溶液以及第二强碱溶液加入至所述第二反应器内进行充分反应并生成具有沉淀的料浆,控制所述料浆的固含量控制在预定范围之内;S4,将S3中充分反应得到的所述料浆转移至陈化槽中继续反应然后进行固液分离,并用去离子水清洗分离出的沉淀;S5,将在S4中得到的沉淀物在富氧气氛中烘干得到三元前驱体材料。
- 根据权利要求1所述的三元前驱体材料的制备方法,其特征在于,所述第一反应器和所述第二反应器为大循环通量反应釜。
- 根据权利要求2所述的三元前驱体材料的制备方法,其特征在于,在步骤S1中,所述第一络合剂以预定的速度连续加入至第一反应器内,并且连续加入所述第一络合剂的时间介于1-24小时之间。
- 根据权利要求1所述的三元前驱体材料的制备方法,其特征在于,在步骤S2中,所述第一反应器内的的PH值介于10.5-12.8之间,并且所述第一反应器内的反应温度介于40-80℃之间。
- 根据权利要求1所述的三元前驱体材料的制备方法,其特征在于,在步骤S2中,所述晶种的粒径介于1-9μm之间。
- 根据权利要求1所述的三元前驱体材料的制备方法,其特征在于,在步骤S3中,所述料浆中的固含量介于700-1600g/L之间。
- 根据权利要求1所述的三元前驱体材料的制备方法,其特征在于,在步骤S3中,所述第二反应器内的的PH值介于10.5-12.8之间。
- 根据权利要求1所述的三元前驱体材料的制备方法,其特征在于,在步骤S5中,所述烘干温度介于270-350℃之间,烘干时间介于1-4小时之间。
- 一种三元前驱体材料,其特征在于,所述三元前驱体材料的分子式为NixCoyMnz(OH)2,其中x+y+z=1,x,y,z的取值范围为0~1,且x、y、z均不等于0和1,所述三元材料前驱体呈球形结构,所述球形结构包括外壳、内核和过渡层,所述外壳为致密结构,所述内核为疏松多孔结构,所述过渡层设置于所述外壳和内核之间,所述三元前驱体材料由氢氧化镍、氢氧化钴和氢氧化锰于原子级别混合形成的混合物,并且所述外壳的结晶度高于所述内核的结晶度,所述过渡层的结晶度介于所述外壳和所述内核之间。
- 根据权利要求9所述的三元前驱体材料,其特征在于,所述三元前驱体材料的D50介于2-18μm之间,并且(D5+D95):D50≤2.2。
- 根据权利要求9所述的三元前驱体材料,其特征在于,所述外壳的厚度介于0.5-10μm之间,所述过渡层的厚度介于0-2μm之间,所述内核的直径不大于10μm;并且所述外壳的振实密度大于所述内核的振实密度,其中所述外壳的振实密度不小于2.5g/cm3,所述内核的振实密度不大于3.0g/cm3。
- 根据权利要求9所述的三元前驱体材料,其特征在于,所 述三元前驱体外壳的直径与所述内核的直径的比值介于1:1-9:1之间。
- 根据权利要求9所述的三元前驱体材料,其特征在于,所述三元前驱体的内核的密度自内部向外部逐步增大。
- 根据权利要求9所述的三元前驱体材料,其特征在于,所述三元前驱体的内核的孔径控制在0.1-2μm之间。
- 根据权利要求9所述的三元前驱体材料,其特征在于,所述三元材料前驱体材料的孔隙率控制在20-70%之间。
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KR102283095B1 (ko) | 2021-07-29 |
US20190359497A1 (en) | 2019-11-28 |
JP2020503229A (ja) | 2020-01-30 |
JP7050071B2 (ja) | 2022-04-07 |
EP3719885A4 (en) | 2021-08-18 |
CN109311698A (zh) | 2019-02-05 |
US11440811B2 (en) | 2022-09-13 |
US20220371913A1 (en) | 2022-11-24 |
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