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Preparation method of battery cathode material lithium nickel cobalt aluminum oxide precursor

A technology of nickel-cobalt-aluminate lithium and battery anode, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of low discharge capacity, poor structural stability, loose particles, etc. effect of density

Inactive Publication Date: 2018-11-06
合肥乘电科技有限责任公司
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AI Technical Summary

Problems solved by technology

The main preparation method of nickel-cobalt-aluminum ternary cathode material is to prepare nickel-cobalt-aluminum precursor by chemical co-precipitation method, and then calcine with lithium salt to obtain NCA material; since the solubility product constant of aluminum hydroxide is 1.3×10-33, The nickel hydroxide and cobalt hydroxide (divalent) are 2×10-15 and 1.6×10-15 respectively, so when the nickel-cobalt-aluminum precursor is prepared by the chemical co-precipitation method, the precipitation of trivalent aluminum ions is particularly fast , not only it is difficult to form a uniform single layered structure with nickel and cobalt precipitation, but also difficult to form spherical large particle precipitation, so the performance index of the NCA material obtained by calcination of the precursor doped with lithium salt is not ideal; the particles are loose, the structural stability is poor and the discharge capacity is partial. Low

Method used

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preparation example Construction

[0021] The invention is a preparation method of a nickel cobalt lithium aluminate precursor, which is a positive electrode material of a battery, comprising the following steps:

[0022] (1) Configure nickel-cobalt solution; nickel salt and cobalt salt with a molar ratio of nickel ion and cobalt ion of 16:3 are added to sulfate radical solution or nitrate radical solution solution, and the proportioning is made into a solution of 1 mol per liter;

[0023] Wherein, nickel salt and cobalt salt are soluble salts such as sulfate or nitrate; preferably use nitrate solution and nitrate; facilitate decomposition in the subsequent roasting process, increase the purity of the final product;

[0024] (2) Precipitate is prepared; Adding concentration is 20-25% ammoniacal liquor and NaOH solution or KOH solution to the nickel-cobalt solution prepared in step (1) under the constant temperature condition of 50-60 degrees centigrade, and the control ph value is between 10-11 Between; Stir to...

Embodiment 1

[0029] (1) Configure nickel-cobalt solution; nickel salt and cobalt salt with a molar ratio of nickel ion and cobalt ion of 16:3 are added to sulfate radical solution or nitrate radical solution solution, and the proportioning is made into a solution of 1 mol per liter;

[0030] Wherein, nickel salt and cobalt salt are soluble salts such as sulfate or nitrate; preferably use nitrate solution and nitrate; facilitate decomposition in the subsequent roasting process, increase the purity of the final product;

[0031] (2) Precipitate is prepared; adding concentration is 20% ammonia water and NaOH solution or KOH solution to the nickel-cobalt solution prepared in step (1) under constant temperature condition of 55 degrees centigrade, control ph value is 10.7; Stir to obtain precipitate;

[0032] (3) purifying the precipitate; washing the precipitate obtained in step (2) after centrifugal filtration, and drying at 100-200 degrees Celsius after washing to obtain the purified precipita...

Embodiment 2

[0036] (1) Configure nickel-cobalt solution; nickel salt and cobalt salt with a molar ratio of nickel ion and cobalt ion of 16:3 are added to sulfate radical solution or nitrate radical solution solution, and the proportioning is made into a solution of 1 mol per liter;

[0037] Wherein, nickel salt and cobalt salt are soluble salts such as sulfate or nitrate; preferably use nitrate solution and nitrate; facilitate decomposition in the subsequent roasting process, increase the purity of the final product;

[0038] (2) Precipitate is prepared; adding concentration is 25% ammonia water and NaOH solution or KOH solution to the nickel-cobalt solution prepared in step (1) under constant temperature condition of 60 degrees centigrade, control ph value is 11; Stir to obtain precipitate;

[0039] (3) purifying the precipitate; washing the precipitate obtained in step (2) after centrifugal filtration, and drying at 200 degrees Celsius after washing to obtain the purified precipitate;

...

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Abstract

The invention discloses a preparation method of battery cathode material lithium nickel cobalt aluminum oxide precursor and relates to the technical field of batteries. The preparation method comprises the steps of (1) preparing nickel-cobalt solution; (2) preparing precipitate; (3) purifying the precipitate; (4) preparing a premix; (5) roasting an end product. The lithium nickel cobalt aluminum oxide precursor is prepared by means of aluminum nitrate roasting; the difficulty in forming large particulate precipitate due to high precipitating speed of trivalent aluminum ions is avoided; the lithium nickel cobalt aluminum oxide precursor that is roasted has high true density. In addition, roasting allows fewer acid radicals to be left in the precipitate, and the purity of the lithium nickelcobalt aluminum oxide precursor is further improved accordingly.

Description

technical field [0001] The invention belongs to the technical field of accumulators, and in particular relates to a preparation method of a nickel-cobalt-lithium-aluminate precursor, which is a positive electrode material of a battery. Background technique [0002] Nickel-cobalt-aluminum ternary cathode material (NCA, lithium nickel-cobalt aluminate) has the advantages of high specific capacity, high voltage and good cycle performance, and has attracted extensive attention in recent years. The main preparation method of nickel-cobalt-aluminum ternary cathode material is to prepare nickel-cobalt-aluminum precursor by chemical co-precipitation method, and then calcine with lithium salt to obtain NCA material; since the solubility product constant of aluminum hydroxide is 1.3×10-33, The nickel hydroxide and cobalt hydroxide (divalent) are 2×10-15 and 1.6×10-15 respectively, so when the nickel-cobalt-aluminum precursor is prepared by the chemical co-precipitation method, the pre...

Claims

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Application Information

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IPC IPC(8): H01M4/525
CPCH01M4/525Y02E60/10
Inventor 徐呈兵陈春华
Owner 合肥乘电科技有限责任公司