Cobalt oxide for coating positive electrode material of lithium battery and preparation method thereof

A cobalt oxide and coating technology, which is applied to the field of cobalt oxide for coating cathode materials of lithium batteries and its preparation, can solve the problems of large specific surface area, poor dispersibility and high particle surface energy, and achieves large specific surface area and small particle size. , good dispersion effect

Active Publication Date: 2022-01-07
취저우화여우코발트뉴머터리얼컴퍼니리미티드 +1
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  • Abstract
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Problems solved by technology

However, because the finer the particles, the easier it is to agglomerate, especially when the particle size is smaller than the micron leve...

Method used

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  • Cobalt oxide for coating positive electrode material of lithium battery and preparation method thereof
  • Cobalt oxide for coating positive electrode material of lithium battery and preparation method thereof
  • Cobalt oxide for coating positive electrode material of lithium battery and preparation method thereof

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preparation example Construction

[0039] The present invention also provides a method for preparing cobalt oxide with a large specific surface area, the method comprising the following steps:

[0040](1) preparation of cobalt ion concentration is the non-complexed cobalt salt solution of 60~150g / L, and configuration concentration is the sodium hydroxide solution of 80~440g / L;

[0041] (2) Under stirring conditions, cobalt salt solution and sodium hydroxide solution are added into the reaction kettle concurrently, and the pH value is controlled at 8 to 12 to generate cobaltous hydroxide. The reaction time is 60 to 120 minutes. Into nitrogen as a protective gas to prevent the cobaltous hydroxide generated from being oxidized;

[0042] (3) stop feeding, stop feeding nitrogen, start to feed the air as the first oxidant, and add the second oxidizer that oxidizing power is stronger than the first oxidant in the reactor, to oxidize cobaltous hydroxide, wherein Control the molar ratio of the second oxidant to the cob...

Embodiment 1

[0055] Solution preparation: mix cobalt sulfate with pure water to prepare a cobalt sulfate solution with a cobalt ion concentration of 60g / L; mix sodium hydroxide with pure water to prepare a sodium hydroxide solution with a concentration of 80g / L.

[0056] Synthesis of cobaltous hydroxide: add pure water to the reaction kettle as the bottom liquid, and pump the prepared cobalt sulfate solution and sodium hydroxide solution into the reaction kettle at the same time at a temperature of 30°C and a stirrer speed of 130rpm to control the reaction The pH is between 8 and 8.3, the reaction time is 60 minutes, and nitrogen gas is introduced as a protective gas, and the flow rate of nitrogen gas is 0.3m 3 / h.

[0057] Oxidation treatment: After the reaction of synthesizing cobaltous hydroxide is completed, stop feeding nitrogen and start feeding air, and the air flow rate is controlled to 0.2m 2 / h, while the oxidizing agent hypochlorous acid is added in the reactor, the molar ratio...

Embodiment 2

[0062] Prepare solution: mix cobalt chloride with pure water to prepare a cobalt chloride solution with a cobalt ion concentration of 100g / L; mix sodium hydroxide with pure water to prepare a sodium hydroxide solution with a concentration of 250g / L.

[0063] Synthesis of cobaltous hydroxide: add pure water to the reaction kettle as the bottom liquid, and pump the prepared cobalt salt cobalt chloride solution and sodium hydroxide solution into the reaction kettle at the same time at a temperature of 50°C and a stirrer speed of 130rpm , control the reaction pH at 9.5 ~ 10.0, the reaction time is 90min, and nitrogen gas is introduced as a protective gas, and the nitrogen flow rate is 1.5m 3 / h.

[0064] Oxidation treatment: After the reaction of synthesizing cobaltous hydroxide is completed, stop feeding nitrogen and start feeding air, and the air flow rate is controlled to 0.55m 2 / h, while adding the oxidizing agent sodium persulfate into the reaction kettle, controlling the m...

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Abstract

The invention discloses a cobalt oxide with a large specific surface area and a preparation method thereof. The method comprises the following steps: (1) preparing a cobalt salt solution and a sodium hydroxide solution; (2) under a stirring condition, adding a cobalt salt solution and a sodium hydroxide solution into a reaction kettle in a parallel flow manner, controlling the pH value to be 8-12, generating cobaltous hydroxide and reacting for 60-120 minutes, and introducing nitrogen as a protective gas; (3) stopping feeding, introducing nitrogen, introducing air serving as a first oxidant, adding a second oxidant with the oxidizing capacity higher than that of the air into the reaction kettle, oxidizing the cobalt hydroxide, controlling the molar ratio of the second oxidant to the cobalt element to be (0.2-0.8): 1, and adjusting the flow of the air to generate cobalt oxide mCoOOH.(1-m)Co3O4, wherein m is 0.36-1; and (4) filtering, washing and drying the oxidized slurry, and crushing by adopting mechanical crushing equipment to obtain a cobalt oxide finished product with the specific surface area of more than 30m < 2 >/g.

Description

technical field [0001] The invention belongs to the technical field of lithium battery positive electrode materials, and in particular relates to a cobalt oxide for covering lithium battery positive electrode materials and a preparation method thereof. Background technique [0002] Lithium batteries have high energy density and are being widely used in electronic devices, electric vehicles and hybrid vehicles. Cathode materials are the core factors that determine the cost and performance of lithium batteries. Common cathode materials mainly include ternary nickel-cobalt lithium manganese oxide, ternary nickel-cobalt lithium aluminate, and lithium cobalt oxide. At present, there are still some problems in the cathode materials of lithium batteries. For example, high-nickel ternary cathode materials have too high nickel content and poor stability of the material structure under high voltage, resulting in the safety of the battery cannot be guaranteed. In addition, there are p...

Claims

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Application Information

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IPC IPC(8): C01G51/04H01M4/36H01M4/52H01M10/052B82Y30/00
CPCC01G51/04H01M4/366H01M4/523H01M10/052B82Y30/00H01M2004/028C01P2006/80C01P2004/64C01P2002/72C01P2004/03Y02E60/10
Inventor 刘人生田礼平张荣洲秦才胜方华雄
Owner 취저우화여우코발트뉴머터리얼컴퍼니리미티드
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