CN113629232A - Modified low-cobalt ternary positive electrode material precursor and positive electrode material - Google Patents

Modified low-cobalt ternary positive electrode material precursor and positive electrode material Download PDF

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CN113629232A
CN113629232A CN202110905939.2A CN202110905939A CN113629232A CN 113629232 A CN113629232 A CN 113629232A CN 202110905939 A CN202110905939 A CN 202110905939A CN 113629232 A CN113629232 A CN 113629232A
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cobalt
cathode material
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ternary cathode
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张宝
邓鹏�
程诚
林可博
丁瑶
周亚楠
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Zhejiang Power New Energy Co Ltd
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Abstract

A precursor of modified low-cobalt ternary positive electrode material and a positive electrode material are disclosed, wherein the chemical formula of the precursor is NixCoyMnzMp(OH)2·nLirNqZrw(PO4)3Wherein x is more than or equal to 0.5<1，0<y≤0.1，0<z≤0.4，0<p is less than or equal to 0.1, x + Y + z + p is 1, M is one or more of Al, Cu and Mg, and N is one or more of Al, Ti, Cr, Sc and Y. The modified low-cobalt ternary cathode material is prepared by the following method: (1) preparing a mixed salt solution of a nickel source, a cobalt source, a manganese source and an M source; (2) mixing the mixed salt solution with NaOH solution and NH3·H2Carrying out coprecipitation reaction on the solution O to obtain an intermediate;(3) uniformly dispersing an N source, a zirconium source, a phosphorus source and a lithium source, then adding the intermediate, evaporating a solvent, and drying in vacuum to obtain a precursor; (4) and uniformly mixing the precursor with a lithium source, and calcining to obtain the lithium ion battery. The precursor of the invention has uniform appearance, the anode material of the invention has excellent electrochemical performance, the preparation method is simple, and the production cost is low.

Description

Modified low-cobalt ternary positive electrode material precursor and positive electrode material
Technical Field
The invention relates to a precursor of a ternary cathode material of a lithium ion battery and a cathode material, in particular to a precursor of a modified low-cobalt ternary cathode material and a cathode material.
Background
The consumption of fossil energy mainly comprising coal and petroleum causes serious environmental pollution problem globally. Energy shortage and environmental protection become the key points of attention in the world today, and the development of new clean energy storage materials is urgently needed. The lithium ion battery is a new green energy storage system and is widely applied to the field of pure electric vehicles and hybrid electric vehicles.
The positive electrode material is one of the key materials of the lithium ion battery, and directly influences the electrochemical properties of the lithium ion battery, such as charge and discharge capacity, cycle performance, rate performance, thermal stability and the like. With the increasing demand of energy density of lithium ion batteries and the rising price of Co-containing resources, the development of Co-containing cathode materials of lithium ion batteries is hindered.
CN107516731A discloses a modified lithium ion battery anode material and a preparation method thereof, wherein the modified lithium ion battery anode material comprises an anode material core and a composite coating layer coated on the surface of the anode material core, and the composite coating layer is made of Li-containing material0.5La0.5TiO3And a first coating layer comprising LiTaO3The structural formula of the core of the anode material is Li1±εNixCoyMnzM1-x-y-zO2Wherein, epsilon is more than-0.1 and less than 0.1, x is more than 0, Y is less than 1, and M is one of elements such as Mg, Sr, Ba, Al, In, Ti, V, Mn, Co, Ni, Y, Zr, Nb, Mo, W, La, Ce, Nd, Sm and the like. But the method can obtainThe cobalt element content of the electrode material is still high, and the electrode material contains La element, so that the production cost is high.
CN108682843A discloses a preparation method of a rock salt type lithium ion battery anode material, which comprises the following steps: (1) grinding and uniformly mixing a lithium source, a high-valence state manganese source and a low-valence state manganese source, calcining in an inert atmosphere, and cooling and grinding along with a furnace to obtain LiMnO2A precursor; (2) the LiMnO obtained in the step (1) is2Grinding and uniformly mixing the precursor and lithium peroxide, calcining in an inert atmosphere, annealing, and cooling along with the furnace to obtain the rock salt type lithium ion battery cathode material Li4Mn2O5. The cathode material obtained by the method does not contain cobalt element, but the electrochemical performance of the cathode material is poor.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a modified low-cobalt ternary cathode material precursor which is simple in preparation method, relatively consistent in appearance and relatively low in production cost.
The invention further aims to solve the technical problem of providing a modified low-cobalt ternary cathode material with excellent electrochemical performance.
The invention adopts the technical scheme that a modified low-cobalt ternary cathode material precursor with a chemical formula of NixCoyMnzMp(OH)2·nLirNqZrw(PO4)3In the formula, x is more than or equal to 0.5<1，0<y≤0.1，0<z≤0.4，0<p is less than or equal to 0.1, x + Y + z + p is 1, M is one or more of Al, Cu and Mg, and N is one or more of Al, Ti, Cr, Sc and Y.
Further, the preparation method of the modified low-cobalt ternary cathode material precursor comprises the following steps:
(1) adding a nickel source, a cobalt source, a manganese source and an M source into deionized water, and uniformly mixing to obtain a mixed salt solution;
(2) mixing the mixed salt solution obtained in the step (1), NaOH solution and NH3·H2Mixing O solution uniformly, carrying out coprecipitation reaction, and continuously stirringStirring to obtain solid-liquid mixed slurry;
(3) carrying out solid-liquid separation on the solid-liquid mixed slurry obtained in the step (2), collecting solids, washing, drying and demagnetizing the solids to obtain an intermediate NixCoyMnzMp(OH)2；
(4) Dispersing an N source, a zirconium source, a phosphorus source and a lithium source in an organic solvent, uniformly mixing, and then adding the intermediate Ni obtained in the step (3)xCoyMnzMp(OH)2Obtaining a mixture, heating to evaporate the solvent, and then drying in vacuum to obtain a precursor Ni of the modified low-cobalt ternary cathode materialxCoyMnzMp(OH)2·nLirNqZrw(PO4)3。
The invention further solves the technical problem by adopting the technical scheme that the modified low-cobalt ternary cathode material is prepared by the following method:
(1) adding a nickel source, a cobalt source, a manganese source and an M source into deionized water, and uniformly mixing to obtain a mixed salt solution;
(2) mixing the mixed salt solution obtained in the step (1), NaOH solution and NH3·H2Mixing the O solution uniformly, carrying out coprecipitation reaction, and continuously stirring to obtain solid-liquid mixed slurry;
(3) carrying out solid-liquid separation on the solid-liquid mixed slurry obtained in the step (2), collecting solids, washing, drying and demagnetizing the solids to obtain an intermediate NixCoyMnzMp(OH)2；
(4) Dispersing an N source, a zirconium source, a phosphorus source and a lithium source in an organic solvent, uniformly mixing, and then adding the intermediate Ni obtained in the step (3)xCoyMnzMp(OH)2Heating and evaporating the mixture to remove the solvent, and then drying in vacuum to obtain a precursor Ni of the modified low-cobalt ternary cathode materialxCoyMnzMp(OH)2·nLirNqZrw(PO4)3；
(5) And (4) uniformly mixing the precursor of the modified low-cobalt ternary cathode material obtained in the step (4) with a lithium source, and calcining in a pure oxygen atmosphere to obtain the modified low-cobalt ternary cathode material.
Further, in the step (1), the total metal ion concentration of the mixed solution is 2-8mol/L, preferably 4-6 mol/L; the manganese source is one or more of manganese acetate, manganese nitrate and manganese sulfate; the nickel source is one or more of nickel acetate, nickel nitrate and nickel sulfate; the cobalt source is one or more of cobalt acetate, cobalt nitrate, cobalt sulfate and cobalt carbonate; the M source is one or more of acetate, nitrate and sulfate.
Further, in the step (2), the concentration of the NaOH solution is 2-8mol/L, preferably 4-5 mol/L; the NH3·H2The concentration of the O solution is 4-8 mol/L, preferably 5-6 mol/L.
Further, in the step (2), the adding amount of the mixed salt solution is 200-500L/h, preferably 300-400L/h; the addition amount of the NaOH solution is 50-200L/h, preferably 100-120L/h; the NH3·H2The addition amount of the O solution is 20-150L/h, preferably 60-80L/h.
Further, in the step (2), the stirring speed of the coprecipitation reaction is 350-600 rpm/min, preferably 400-500 rpm/min, the pH value of the reaction solution is 11.0-13.5, preferably 11.5-12.0, the ammonia value is 11-17 g/L, preferably 12-13 g/L, and the reaction temperature is 55-70 ℃.
Further, in the step (2), the time of the coprecipitation reaction is 12-48 h, preferably 24-36 h.
Further, in the step (4), the N source is one or more of acetate, nitrate and sulfate; the zirconium source is one or two of zirconium sulfate and zirconium nitrate; the lithium source is one or more of lithium hydroxide, lithium carbonate and lithium nitrate; the phosphorus source is one or more of ammonium dihydrogen phosphate, diammonium hydrogen phosphate and phosphoric acid.
Further, in the step (4), the organic solvent is one or more of ethanol, ethylene glycol, isopropanol and N, N-Dimethylformamide (DMF).
Further, in the step (4), the solid-to-liquid ratio of the mixture is adjusted to be 1g: 5-25 mL, preferably 1g: 8-12 mL; the temperature of the evaporation solvent is 70-90 ℃; the time for evaporating the solvent is 2-6 hours, preferably 4-5 hours; the vacuum drying temperature is 100-120 ℃; the vacuum drying time is 8-15 h.
Further, in the step (5), the calcining is performed by calcining at 450-550 ℃ for 4-8 h, then heating to 650-980 ℃ for 10-20 h, preferably at 500-520 ℃ for 5-6 h, and then heating to 750-900 ℃ for 12-15 h.
The first stage of the coprecipitation reaction is a nucleation stage of the precursor particles, and the second stage is a growth stage of the precursor particles. The pH value and the ammonia value of the reaction liquid in the first stage and the second stage of the coprecipitation reaction are mainly adjusted by controlling the adding amount of ammonia water.
Compared with the prior art, the invention has the following beneficial effects:
(1) according to the invention, a modified low-cobalt ternary cathode material precursor and a modified low-cobalt ternary cathode material are obtained by utilizing a dual modification means of metal element doping and lithium ion fast ion conductor phase coating, and the structural stability and the conductivity of the low-cobalt ternary cathode material are enhanced through the synergistic effect of the metal element doping and the lithium ion fast ion conductor phase coating; the lithium ion battery assembled by the anode made of the modified low-cobalt ternary anode material has excellent electrochemical performance;
(2) the preparation method of the modified low-cobalt ternary cathode material is simple, is simple and convenient to operate, has low requirements on equipment and is low in production cost.
Drawings
FIG. 1 shows a precursor Ni of a modified low-cobalt ternary cathode material in example 1 of the present inventionxCoyMnzMp(OH)2·nLirNqZrw(PO4)3SEM image of (d).
FIG. 2 shows modified low-cobalt ternary cathode material precursor Ni in example 2 of the present invention0.83Co0.03Mn0.10Al0.04(OH)2·0.01Li2AlZr(PO4)3SEM image of (d).
Detailed Description
The invention is further described with reference to the following figures and specific examples.
Example 1
The chemical formula of the precursor of the modified low-cobalt ternary cathode material is Ni0.5Co0.15Mn0.30Mg0.05(OH)2·0.01LiTiZr(PO4)3。
The modified low-cobalt ternary cathode material is prepared by the following method:
(1) adding nickel sulfate, cobalt sulfate, manganese sulfate and magnesium sulfate into deionized water according to the molar ratio of 0.5:0.15:0.3:0.05, and uniformly mixing to obtain a mixed salt solution with the total metal ion concentration of 4 mol/L;
(2) mixing the mixed salt solution obtained in the step (1) with 400L/h, a precipitator NaOH solution of 120L/h and 4mol/L and a complexing agent NH of 80L/h and 5mol/L3·H2Mixing O uniformly, controlling the temperature of reaction liquid to be 65 ℃, the ammonia value to be 13g/L and the pH value to be 12, carrying out coprecipitation reaction for 24 hours, and continuously stirring at the rotating speed of 400rpm/min to obtain solid-liquid mixed slurry;
(3) carrying out solid-liquid separation on the solid-liquid mixed slurry obtained in the step (2), collecting solids, washing, drying and demagnetizing the solids to obtain an intermediate Ni0.5Co0.15Mn0.30Mg0.05(OH)2；
(4) Dispersing 0.01mol of tetrabutyl titanate, 0.01mol of zirconium nitrate, 0.03mol of ammonium dihydrogen phosphate and 0.01mol of lithium nitrate in 100ml of absolute ethyl alcohol, uniformly mixing, and then adding 1mol of intermediate Ni obtained in the step (3)0.5Co0.15Mn0.30Mg0.05(OH)2Heating and evaporating at 90 ℃ for 4h to obtain a mixture, and then vacuum drying at 110 ℃ for 12h to obtain a precursor Ni of the modified low-cobalt ternary cathode material0.5Co0.15Mn0.30Mg0.05(OH)2·0.01LiTiZr(PO4)3；
(5) And (3) uniformly mixing the 1mol of modified low-cobalt ternary cathode material precursor obtained in the step (4) with 1.1mol of lithium nitrate, calcining in a pure oxygen atmosphere, calcining at 480 ℃ for 5h, and then heating to 900 ℃ for calcining for 15h to obtain the modified low-cobalt ternary cathode material.
As shown in FIG. 1, the modified low-cobalt ternary cathode material precursor Ni of the embodiment0.5Co0.15Mn0.30Mg0.05(OH)2·0.01LiTiZr(PO4)3The morphology of the particles is spherical, and the particle size of the particles is 10-12 mu m. The cathode made of the modified low-cobalt ternary cathode material of the embodiment is assembled into a button battery for electrochemical performance test, the first discharge gram capacity under 0.1C (1C 160mAh/g) multiplying power reaches 157.8mAh/g, the discharge specific capacity under 1C is 145.7mAh/g, and the capacity retention rate after 100 cycles reaches 95.6% in the voltage range of 3-4.3V.
Example 2
The chemical formula of the precursor of the modified low-cobalt ternary cathode material is Ni0.83Co0.03Mn0.10Al0.04(OH)2·0.01Li2AlZr(PO4)3。
The modified low-cobalt ternary cathode material is prepared by the following method:
(1) adding nickel sulfate, cobalt sulfate, manganese sulfate and aluminum sulfate into deionized water according to the mol ratio of 0.83:0.03:0.10:0.04, and uniformly mixing to obtain a mixed salt solution with the total metal ion concentration of 6 mol/L;
(2) mixing the mixed salt solution obtained in the step (1) with 400L/h, a precipitator NaOH solution of 120L/h and 4mol/L and a complexing agent NH of 80L/h and 6mol/L3·H2Mixing O uniformly, controlling the temperature of reaction liquid to be 65 ℃, the ammonia value to be 13g/L and the pH value to be 12, carrying out coprecipitation reaction for 24 hours, and continuously stirring at the rotating speed of 400rpm/min to obtain solid-liquid mixed slurry;
(3) carrying out solid-liquid separation on the solid-liquid mixed slurry obtained in the step (2), collecting solids, washing, drying and demagnetizing the solids to obtain an intermediate Ni0.83Co0.03Mn0.10Al0.04(OH)2；
(4) 0.01mol of aluminum nitrate, 0.01mol of zirconium nitrate, 0.03mol of ammonium hydrogen phosphate and 0.02mol of lithium nitrate are dispersed in 200ml of absolute ethyl alcohol, mixed uniformly and then added with 1mol of intermediate Ni obtained in the step (3)0.83Co0.03Mn0.10Al0.04(OH)2Obtaining a mixture, heating and evaporating at 85 ℃ for 5h, and then vacuum drying at 120 ℃ for 10h to obtain a precursor Ni of the modified low-cobalt ternary cathode material0.83Co0.03Mn0.10Al0.04(OH)2·0.01Li2AlZr(PO4)3；
(5) And (3) uniformly mixing 1mol of the modified low-cobalt ternary cathode material precursor obtained in the step (4) with 1.05mol of lithium hydroxide, calcining in a pure oxygen atmosphere, calcining at 500 ℃ for 5h, and then heating to 750 ℃ for 12h to obtain the modified low-cobalt ternary cathode material.
As shown in FIG. 2, the modified low-cobalt ternary cathode material precursor Ni of the present example0.83Co0.03Mn0.10Al0.04(OH)2·0.01Li2AlZr(PO4)3The morphology of the particles is spherical, and the particle size of the particles is 8-12 mu m. The cathode made of the modified low-cobalt ternary cathode material of the embodiment is assembled into a button battery for electrochemical performance test, the first discharge gram capacity under 0.1C (1C is 200mA/g) multiplying power reaches 203.8mAh/g, the discharge specific capacity under 1C reaches 185.7mAh/g, and the capacity retention rate after 100 cycles reaches 91.3% in a voltage range of 3-4.3V.
Example 3
The chemical formula of the precursor of the modified low-cobalt ternary cathode material is Ni0.65Co0.10Mn0.20Cu0.05(OH)2·0.01Li1.15Y0.15Zr1.85(PO4)3。
The modified low-cobalt ternary cathode material is prepared by the following method:
(1) adding nickel acetate, cobalt acetate, manganese acetate and copper sulfate into deionized water according to the molar ratio of 0.65:0.10:0.20:0.05, and uniformly mixing to obtain a mixed salt solution with the total metal ion concentration of 6 mol/L;
(2) mixing 350L/h of mixed salt solution obtained in the step (1), 100L/h of 4mol/L of precipitator NaOH solution and 60L/h of 6mol/L of complexing agent NH3·H2Mixing O uniformly, controlling the temperature of the reaction solution at 60 ℃ and the ammonia value at 11.8g/L, the pH value is 11.5, coprecipitation reaction is carried out for 36 hours, and the mixture is continuously stirred at the rotating speed of 500rpm/min to obtain solid-liquid mixed slurry;
(3) carrying out solid-liquid separation on the solid-liquid mixed slurry obtained in the step (2), collecting solids, washing, drying and demagnetizing the solids to obtain an intermediate Ni0.65Co0.10Mn0.20Cu0.05(OH)2；
(4) Dispersing 0.015mol of yttrium nitrate, 0.0185mol of zirconium nitrate, 0.03mol of diammonium hydrogen phosphate and 0.115mol of lithium nitrate in 100ml of absolute ethyl alcohol, uniformly mixing, and then adding 1mol of intermediate Ni obtained in the step (3)0.65Co0.10Mn0.20Cu0.05(OH)2Obtaining a mixture, heating and evaporating at 80 ℃ for 6h, and then vacuum drying at 110 ℃ for 12h to obtain a precursor Ni of the modified low-cobalt ternary cathode material0.65Co0.10Mn0.20Cu0.05(OH)2·0.01Li1.15Y0.15Zr1.85(PO4)3；
(5) And (3) uniformly mixing 1mol of the modified low-cobalt ternary positive electrode material precursor obtained in the step (4) with 1.07mol of lithium carbonate, calcining in a pure oxygen atmosphere, firstly calcining at 450 ℃ for 5h, and then heating to 850 ℃ for calcining for 12h to obtain the modified low-cobalt ternary positive electrode material.
This example modified low-cobalt ternary cathode material precursor Ni0.65Co0.10Mn0.20Cu0.05(OH)2·0.01Li1.15Y0.15Zr1.85(PO4)3The morphology of the particles is spherical, and the particle size of the particles is 8-12 mu m. The cathode made of the modified low-cobalt ternary cathode material of the embodiment is assembled into a button battery for electrochemical performance test, the first discharge gram capacity under 0.1C (1C is 180mA/g) multiplying power reaches 190.4mAh/g, the discharge specific capacity under 1C reaches 171.4mAh/g, and the capacity retention rate after 100 cycles reaches 90.7% in a voltage range of 3-4.3V.
Comparative example 1
Comparative example 1 is compared with example 2 with the difference that zinc sulfate is used instead of aluminum sulfate and the other reaction raw materials and preparation conditions are unchanged.
Comparative example1 ternary cathode material precursor Ni0.83Co0.03Mn0.10Zn0.04(OH)2·0.01Li2AlZr(PO4)3The morphology of the particles is spherical, and the particle size of the particles is 8-12 mu m. The ternary cathode material obtained in the comparative example 1 is used for preparing a cathode to assemble a button cell for electrochemical performance test, the first discharge gram capacity under 0.1C (1C is 200mA/g) multiplying power reaches 201.7mAh/g, the discharge specific capacity under 1C reaches 183.8mAh/g, and the capacity retention rate after 100 cycles reaches 87.9% in a voltage range of 3-4.3V.
Comparative example 2
Comparative example 2 is compared with example 2, except that 0.01Li was not carried out2AlZr(PO4)3Coating, other reaction raw materials and preparation conditions are unchanged.
Comparative example 2 ternary cathode Material precursor Ni0.83Co0.03Mn0.10Al0.04(OH)2The morphology of the particles is spherical, and the particle size of the particles is 8-12 mu m. The ternary cathode material obtained in the comparative example 2 is used for preparing a cathode to assemble a button cell for electrochemical performance test, the first discharge gram capacity under 0.1C (1C is 200mA/g) multiplying power reaches 200.9mAh/g, the discharge specific capacity under 1C is 180.3mAh/g, and the capacity retention rate after 100 cycles reaches 85.6% in a voltage range of 3-4.3V.

Claims (10)

1. The precursor of the modified low-cobalt ternary cathode material is characterized in that the chemical formula of the precursor is NixCoyMnzMp(OH)2·nLirNqZrw(PO4)3In the formula, x is more than or equal to 0.5<1，0<y≤0.1，0<z≤0.4，0<p is less than or equal to 0.1, x + Y + z + p is 1, M is one or more of Al, Cu and Mg, and N is one or more of Al, Ti, Cr, Sc and Y.
2. A modified low-cobalt ternary cathode material is characterized by being prepared by the following method:
(1) adding a nickel source, a cobalt source, a manganese source and an M source into deionized water, and uniformly mixing to obtain a mixed salt solution;
(2) mixing the mixed salt solution obtained in the step (1), NaOH solution and NH3·H2Mixing the O solution uniformly, carrying out coprecipitation reaction, and continuously stirring to obtain solid-liquid mixed slurry;
(3) carrying out solid-liquid separation on the solid-liquid mixed slurry obtained in the step (2), collecting solids, washing, drying and demagnetizing the solids to obtain an intermediate NixCoyMnzMp(OH)2；
(4) Dispersing an N source, a zirconium source, a phosphorus source and a lithium source in an organic solvent, uniformly mixing, and then adding the intermediate Ni obtained in the step (3)xCoyMnzMp(OH)2Heating and evaporating the mixture to remove the solvent, and then drying in vacuum to obtain a precursor Ni of the modified low-cobalt ternary cathode materialxCoyMnzMp(OH)2·nLirNqZrw(PO4)3；
(5) And (4) uniformly mixing the precursor of the modified low-cobalt ternary cathode material obtained in the step (4) with a lithium source, and calcining in a pure oxygen atmosphere to obtain the modified low-cobalt ternary cathode material.
3. The modified low-cobalt ternary cathode material as claimed in claim 2, wherein in the step (1), the total metal ion concentration of the mixed solution is 2-8 mol/L; the manganese source is one or more of manganese acetate, manganese nitrate and manganese sulfate; the nickel source is one or more of nickel acetate, nickel nitrate and nickel sulfate; the cobalt source is one or more of cobalt acetate, cobalt nitrate, cobalt sulfate and cobalt carbonate; the M source is one or more of acetate, nitrate and sulfate.
4. The modified low-cobalt ternary cathode material as claimed in claim 2 or 3, wherein in the step (2), the concentration of the NaOH solution is 2-8 mol/L; the NH3The concentration of the H2O solution is 4-8 mol/L.
5. A method according to any one of claims 2 to 4, whereinThe modified low-cobalt ternary cathode material is characterized in that in the step (2), the addition amount of the mixed salt solution is 200-500L/h; the addition amount of the NaOH solution is 50-200L/h; the NH3·H2The addition amount of the O solution is 20-150L/h.
6. The modified low-cobalt ternary cathode material as claimed in any one of claims 2 to 5, wherein in the step (2), the stirring speed of the coprecipitation reaction is 350 to 600rpm/min, the pH value of the reaction solution is 11.0 to 13.5, the ammonia value is 11 to 17g/L, and the reaction temperature is 55 to 70 ℃.
7. The modified low-cobalt ternary cathode material according to any one of claims 2 to 6, wherein in the step (4), the N source is one or more of acetate, nitrate and sulfate; the zirconium source is one or two of zirconium sulfate and zirconium nitrate; the lithium source is one or more of lithium hydroxide, lithium carbonate and lithium nitrate; the phosphorus source is one or more of ammonium dihydrogen phosphate, diammonium hydrogen phosphate and phosphoric acid.
8. The modified low-cobalt ternary cathode material according to any one of claims 2 to 7, wherein in the step (4), the organic solvent is one or more of ethanol, ethylene glycol, isopropanol and N, N-dimethylformamide.
9. The modified low-cobalt ternary cathode material as claimed in any one of claims 2 to 8, wherein in the step (4), the solid-to-liquid ratio of the mixture is adjusted to 1g: 5-25 mL; the temperature of the evaporation solvent is 70-90 ℃; the time for evaporating the solvent is 2-6 h; the vacuum drying temperature is 100-120 ℃; the vacuum drying time is 8-15 h.
10. The modified low-cobalt ternary cathode material as claimed in any one of claims 2 to 9, wherein in the step (5), the calcination is performed by calcining at 450 to 550 ℃ for 4 to 8 hours, and then heating to 650 to 980 ℃ for 10 to 20 hours.
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Application publication date: 20211109