A kind of nickel-cobalt-manganese ternary positive electrode material and its preparation method and application

Abstract

The invention provides a nickel-cobalt-manganese ternary positive electrode material and a preparation method and application thereof. The nickel-cobalt-manganese ternary positive electrode material is LiNi<0.8>Co<0.1>Mn<0.2>O<2>, and the surface with primary particles of the nickel-cobalt-manganese ternary positive electrode material is coated with lithium boron oxide. The preparation method comprises the following steps: dispersing a nickel-cobalt-manganese ternary precursor into an alcohol solution, and performing stirring and mixing to form a solution A; adding boric acid into water, and stirring until the boric acid is completely dissolved to form a solution B; adding the solution B into the solution A, stirring, heating and drying by distillation to obtain solid powder; and mixing the solid powder with lithium salt, and calcining to obtain the nickel-cobalt-manganese ternary positive electrode material. The coating substance H3BO3 is dissolved in an aqueous solution, enters gaps of secondary particles of the ternary precursor, is separated out among the primary particles in the solvent evaporation drying process, and is then fired, so that coating of the primary particles is realized, generation of microcracks of the primary particles can be effectively inhibited, and the cycle stability of a battery is improved.

Description

technical field

[0001] The invention relates to the field of lithium ion batteries, in particular to a nickel-cobalt-manganese ternary positive electrode material and a preparation method and application thereof. Background technique

[0002] As a green and environmentally friendly secondary battery, lithium-ion batteries have the advantages of stable voltage, long cycle life, light weight, environmental friendliness, and no memory effect, making them widely used in portable electronic devices, notebook computers, power tools, electric vehicles and other fields. With the rapid development of the above fields, people put forward higher requirements for lithium-ion batteries. The cathode material of lithium-ion batteries is the key material that determines the performance of the battery, and cathode materials with high capacity, long cycle and high safety will become the development trend of cathode materials in the future.

[0003] Ternary cathode materials have become the ...

Examples

Embodiment 1

[0036] The ternary precursor molecular formula of the present invention is Ni 0.8 co 0.1 mn 0.1 (OH) 2 , with a D50 of 10.54 μm and an average pore size of 4 nm.

[0037] (1) Weigh 10.00g of the precursor, pour it into a beaker containing 50ml of absolute ethanol solution, and stir and mix at room temperature for 0.5h.

[0038] (2) Weigh 0.053g of H 3 BO 3 (accounting for 0.8mol% of precursor) is dissolved in the pure water of 10ml, stirs to H 3 BO 3 completely dissolved.

[0039] (3) Pour the solution in step (2) into the solution in step (1), stir at room temperature for 10 h, and evaporate to dryness in a water bath at 90° C. to obtain a solid powder.

[0040] (4) Measure the solid powder in step (3), calculate the molar amount of transition metal in the powder, and carry out lithium compounding according to the transition metal to lithium molar ratio of 1:1.05. After the solid powder and lithium salt are evenly mixed, in a pure oxygen atmosphere, the flow rate is ...

Embodiment 2

[0059] The ternary precursor of the present invention chooses molecular formula to be Ni 0.8 co 0.1 mn 0.1 (OH) 2 The precursor of D50 is 10.54μm, and the average pore diameter is 4nm.

[0060] (1) Weigh 10.00g of the precursor, pour it into a beaker containing 50ml of absolute ethanol solution, and stir and mix at room temperature for 0.5h.

[0061] (2) Weigh 0.040g of H 3 BO 3 (accounting for 0.6mol% of precursor) is dissolved in the pure water of 10ml, stirs to H 3 BO 3 completely dissolved.

[0062] (3) Pour the solution in step (2) into the solution in step (1), stir evenly at room temperature for 10 h, stir and evaporate the obtained solution in a water bath at 90° C. to obtain a solid powder.

[0063] (4) Weigh the solid powder in step (3), calculate the molar amount of the precursor metal in the powder, and carry out lithium compounding according to the ratio of the molar amount of metal to the molar ratio of lithium salt as 1:1.05. After mixing the solid powd...

Embodiment 3

[0066] The ternary precursor of the present invention chooses molecular formula to be Ni 0.8 co 0.1 mn 0.1 (OH) 2 The precursor of D50 is 10.54μm, and the average pore diameter is 4nm.

[0067] (1) Weigh 10.00g of the precursor, pour it into a beaker containing 50ml of anhydrous n-propanol solution, and stir and mix at room temperature for 0.5h.

[0068] (2) Weigh 0.053g of H 3 BO 3 Dissolve in 10ml of pure water, stir until H 3 BO 3 completely dissolved.

[0069] (3) Pour the solution in step (2) into the solution in step (1), stir evenly at room temperature for 10 h, stir and evaporate the obtained solution in a water bath at 120° C. to obtain a solid powder.

[0070] (4) Weigh the solid powder in step (3), calculate the molar amount of the precursor metal in the powder, and carry out lithium compounding according to the ratio of the molar amount of metal to the molar ratio of lithium salt as 1:1.05. After mixing the solid powder and lithium salt evenly, in a pure o...

technical field

[0001] The invention relates to the field of lithium ion batteries, in particular to a nickel-cobalt-manganese ternary positive electrode material and a preparation method and application thereof. Background technique

[0002] As a green and environmentally friendly secondary battery, lithium-ion batteries have the advantages of stable voltage, long cycle life, light weight, environmental friendliness, and no memory effect, making them widely used in portable electronic devices, notebook computers, power tools, electric vehicles and other fields. With the rapid development of the above fields, people put forward higher requirements for lithium-ion batteries. The cathode material of lithium-ion batteries is the key material that determines the performance of the battery, and cathode materials with high capacity, long cycle and high safety will become the development trend of cathode materials in the future.

[0003] Ternary cathode materials have become the ...

Examples

Embodiment 1

[0036] The ternary precursor molecular formula of the present invention is Ni 0.8 co 0.1 mn 0.1 (OH) 2 , with a D50 of 10.54 μm and an average pore size of 4 nm.

[0037] (1) Weigh 10.00g of the precursor, pour it into a beaker containing 50ml of absolute ethanol solution, and stir and mix at room temperature for 0.5h.

[0038] (2) Weigh 0.053g of H 3 BO 3 (accounting for 0.8mol% of precursor) is dissolved in the pure water of 10ml, stirs to H 3 BO 3 completely dissolved.

[0039] (3) Pour the solution in step (2) into the solution in step (1), stir at room temperature for 10 h, and evaporate to dryness in a water bath at 90° C. to obtain a solid powder.

[0040] (4) Measure the solid powder in step (3), calculate the molar amount of transition metal in the powder, and carry out lithium compounding according to the transition metal to lithium molar ratio of 1:1.05. After the solid powder and lithium salt are evenly mixed, in a pure oxygen atmosphere, the flow rate is ...

Embodiment 2

[0059] The ternary precursor of the present invention chooses molecular formula to be Ni 0.8 co 0.1 mn 0.1 (OH) 2 The precursor of D50 is 10.54μm, and the average pore diameter is 4nm.

[0060] (1) Weigh 10.00g of the precursor, pour it into a beaker containing 50ml of absolute ethanol solution, and stir and mix at room temperature for 0.5h.

[0061] (2) Weigh 0.040g of H 3 BO 3 (accounting for 0.6mol% of precursor) is dissolved in the pure water of 10ml, stirs to H 3 BO 3 completely dissolved.

[0062] (3) Pour the solution in step (2) into the solution in step (1), stir evenly at room temperature for 10 h, stir and evaporate the obtained solution in a water bath at 90° C. to obtain a solid powder.

[0063] (4) Weigh the solid powder in step (3), calculate the molar amount of the precursor metal in the powder, and carry out lithium compounding according to the ratio of the molar amount of metal to the molar ratio of lithium salt as 1:1.05. After mixing the solid powd...

Embodiment 3

[0066] The ternary precursor of the present invention chooses molecular formula to be Ni 0.8 co 0.1 mn 0.1 (OH) 2 The precursor of D50 is 10.54μm, and the average pore diameter is 4nm.

[0067] (1) Weigh 10.00g of the precursor, pour it into a beaker containing 50ml of anhydrous n-propanol solution, and stir and mix at room temperature for 0.5h.

[0068] (2) Weigh 0.053g of H 3 BO 3 Dissolve in 10ml of pure water, stir until H 3 BO 3 completely dissolved.

[0069] (3) Pour the solution in step (2) into the solution in step (1), stir evenly at room temperature for 10 h, stir and evaporate the obtained solution in a water bath at 120° C. to obtain a solid powder.

[0070] (4) Weigh the solid powder in step (3), calculate the molar amount of the precursor metal in the powder, and carry out lithium compounding according to the ratio of the molar amount of metal to the molar ratio of lithium salt as 1:1.05. After mixing the solid powder and lithium salt evenly, in a pure o...

Images