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Nickel, cobalt and aluminum hydroxide and preparation method thereof and cathode material for lithium ion cell

A hydroxide, nickel-cobalt-aluminum technology, used in battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor thermal stability, poor overcharge resistance, and high irreversible capacity at the first discharge. High solid density, easy-to-control effects

Inactive Publication Date: 2015-12-30
NINGBO RONBAY LITHIUM BATTERY MATERIAL CO LTD
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Among the high-nickel cathode materials, small-particle nickel-cobalt-aluminum cathode materials are widely used in the field of power lithium-ion batteries due to their high energy, high rate performance and safety performance, such as LiNiO 2 It is a positive electrode material for the base material doped Co element system, which has both LiNiO 2 The material has the advantages of high discharge specific capacity. At the same time, the crystal layer structure of this positive electrode material is stable, and the cycle stability of the material is also good; however, this positive electrode material has poor overcharge resistance and poor thermal stability. , The defect of high irreversible capacity in the first discharge

Method used

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  • Nickel, cobalt and aluminum hydroxide and preparation method thereof and cathode material for lithium ion cell
  • Nickel, cobalt and aluminum hydroxide and preparation method thereof and cathode material for lithium ion cell
  • Nickel, cobalt and aluminum hydroxide and preparation method thereof and cathode material for lithium ion cell

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preparation example Construction

[0039] The invention provides a method for preparing nickel-cobalt-aluminum hydroxide, comprising:

[0040] Mixing the nickel salt solution and the cobalt salt solution to obtain the first mixed solution;

[0041] mixing the aluminum salt solution with a complexing agent to obtain a second solution, the complexing agent comprising ammonia water, disodium edetate, sulfosalicylic acid or glycine;

[0042] Under the action of a precipitating agent, the first mixed solution and the second mixed solution are subjected to coprecipitation reaction to obtain nickel cobalt aluminum hydroxide;

[0043] The temperature of the co-precipitation reaction is 40°C to 65°C,

[0044] The pH value of the co-precipitation reaction is 10.5-12;

[0045] The nickel-cobalt-aluminum hydroxide is a compound shown in formula I:

[0046] Ni 1-x-y co x Al y (OH) 2+y Formula I;

[0047] In Formula I, 0.1≤x≤0.2, 0.03≤y≤0.10.

[0048] The invention mixes the nickel salt solution and the cobalt salt ...

Embodiment 1

[0070] Dissolving nickel sulfate and cobalt sulfate in water is made into the first mixed solution whose metal ion concentration is 1.5mol / L, and the molar ratio of nickel and cobalt in the first mixed solution is 8:1;

[0071] Aluminum sulfate solution and sulfosalicylic acid are made into the second mixed solution that aluminum ion concentration is 0.4mol / L by the molar ratio of 1:0.5;

[0072] The first mixed solution, the second mixed solution, 9.5 mol / L ammonia water and 6 mol / L sodium hydroxide solution are added to the reaction vessel in parallel flow through a metering pump, at 55 ° C and a stirring speed of 220 rpm Carry out continuous co-precipitation reaction under the condition that the pumping speed ratio of the first mixed solution and the second mixed solution is 4.8:1; control the pumping speed of ammonia water and sodium hydroxide solution so that the ammonia value in the coprecipitation process is 14.5 , the pH value is 11.6;

[0073] The obtained co-precipi...

Embodiment 2

[0078] Dissolving nickel sulfate and cobalt sulfate in water is made into the first mixed solution whose metal ion concentration is 1.5mol / L, and the mol ratio of nickel and cobalt in the first mixed solution is 8.45:1.55;

[0079] Aluminum sulfate solution and sulfosalicylic acid are made into the second mixed solution that aluminum ion concentration is 0.4mol / L by the molar ratio of 1:3;

[0080] The first mixed solution, the second mixed solution, 9.5 mol / L ammonia water and 6 mol / L sodium hydroxide solution are added to the reaction vessel in parallel flow through a metering pump, at 45 ° C and a stirring speed of 270 rpm Carry out continuous co-precipitation reaction under the condition that the pumping speed ratio of the first mixed solution and the second mixed solution is 7.3:1; control the pumping speed of ammonia water and sodium hydroxide solution so that the ammonia value in the coprecipitation process is 16.5 , the pH value is 11.3;

[0081] The obtained co-preci...

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Abstract

The invention provides a preparation method for nickel, cobalt and aluminum hydroxide. The preparation method comprises the steps that a nickel salt solution and a cobalt salt solution are mixed to obtain a first mixed solution; an aluminum salt solution and a complexing agent are mixed to obtain a second mixed solution; under the action of a precipitant, a coprecipitation reaction is performed on the first mixed solution and the second mixed solution to obtain the nickel, cobalt and aluminum hydroxide, the complexing agent is prepared from aqueous ammonia, ethylene diamine tetraacetic acid and sulfosalicylic acid or glycine, the temperature of the coprecipitation reaction is set at 40 DEG C-65 DEG C, and the pH value of the coprecipitation reaction is set at 10.5-12. By controlling the material adding order, selection of the complexing agent and the temperature and the pH value of the coprecipitation reaction, the prepared nickel, cobalt and aluminum hydroxide has the better spherical appearance and is concentrated in particle size and high in tap density. The invention further provides the nickel, cobalt and aluminum hydroxide prepared through the method and a cathode material for a lithium ion cell.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a nickel-cobalt-aluminum hydroxide, a preparation method thereof, and a lithium-ion battery cathode material. Background technique [0002] Among the positive electrode materials of lithium-ion batteries, high-energy, high-rate, and high-safety positive electrode materials have always been the focus of positive electrode material research, and high-nickel-based positive electrode materials have received extensive attention due to their advantages of high capacity. Among the high-nickel cathode materials, small-particle nickel-cobalt-aluminum cathode materials are widely used in the field of power lithium-ion batteries due to their high energy, high rate performance and safety performance, such as LiNiO 2 It is a positive electrode material for the base material doped Co element system, which has both LiNiO 2 The material has the advantages of high discharge specifi...

Claims

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Application Information

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IPC IPC(8): H01M4/525H01M10/0525
CPCH01M4/525H01M10/0525H01M2004/021Y02E60/10
Inventor 温美盛袁徐俊陈涨宗罗江鲲于建朱珠佘圣贤应皆荣
Owner NINGBO RONBAY LITHIUM BATTERY MATERIAL CO LTD
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