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Nickel-cobalt binary precursor and preparation method thereof

A precursor, nickel-cobalt technology, applied in the direction of chemical instruments and methods, nickel compounds, electrical components, etc., can solve the problems of low solid content, unspecified product characteristics, etc., and achieve high sphericity and good consistency

Active Publication Date: 2021-10-22
JINCHI ENERGY MATERIALS CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The Chinese patent application document with the publication number CN111517377A discloses the production method of the nickel-cobalt binary precursor. The process is simple and the solid content is low, but the product characteristics are not described.

Method used

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  • Nickel-cobalt binary precursor and preparation method thereof
  • Nickel-cobalt binary precursor and preparation method thereof
  • Nickel-cobalt binary precursor and preparation method thereof

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Embodiment 1

[0037] This embodiment includes the following steps:

[0038] (1) According to the molecular formula Ni 0.9 co 0.1 (OH) 2 Prepare a nickel-cobalt mixed metal salt solution with a total metal ion concentration of 2mol / L; prepare a 10mol / L sodium hydroxide solution; prepare a 11mol / L ammonia solution.

[0039](2) Add 200L of pure water to a 300L volume reactor, control the temperature at 65°C, control the stirring speed at 750rpm, pass in sodium hydroxide solution to adjust the pH value to 11.50±0.05, and continuously feed nitrogen into the reactor . Into the bottom liquid of the reaction kettle, flow into the nickel-cobalt mixed metal salt solution, sodium hydroxide solution and ammonia solution in the step (1), wherein the flow rate of the nickel-cobalt mixed metal salt solution is 120ml / min, and adjust the hydrogen oxidation after the reaction starts. Sodium solution flow rate, stabilize the pH value in the reactor to 10.6±0.05, control the ammonium ion concentration in ...

Embodiment 2

[0045] This embodiment includes the following steps:

[0046] (1) According to the molecular formula Ni 0.8 co 0.2 (OH) 2 Prepare 1.2mol / L nickel-cobalt mixed metal salt solution; prepare 5mol / L sodium hydroxide solution; prepare 6mol / L ammonia solution;

[0047] (2) Add 200L of pure water to a 300L reactor, control the temperature at 55°C, control the stirring speed at 550rpm, pass in sodium hydroxide solution to adjust the pH value to 11.10±0.05, and continuously feed nitrogen into the reactor . The nickel-cobalt mixed metal salt solution, sodium hydroxide solution and ammonia solution prepared in step (1) are flowed into the bottom liquid of the reaction kettle concurrently, wherein the flow rate of the nickel-cobalt mixed metal salt solution is 120ml / min, and the hydrogen is adjusted after the reaction starts. Sodium oxide solution flow, stabilize the pH value of the reaction system to 10.10±0.1, control the concentration of ammonium ions in the reaction system to abou...

Embodiment 3

[0052] This embodiment includes the following specific steps:

[0053] (1) According to the molecular formula Ni 0.97 co 0.03 (OH) 2 Prepare a nickel-cobalt mixed metal salt solution with a total metal ion concentration of 2.2mol / L; prepare an 8mol / L sodium hydroxide solution; prepare a 12mol / L ammonia solution;

[0054] (2) Add 200L of pure water to a 300L reactor, control the temperature at 75°C, control the stirring speed at 650rpm, pass in sodium hydroxide solution to adjust the pH value to 11.90±0.05, and continuously feed nitrogen into the reactor . The nickel-cobalt mixed metal salt solution, sodium hydroxide solution and ammonia solution prepared in step (1) are flowed into the bottom liquid of the reaction kettle concurrently, wherein the flow rate of the nickel-cobalt mixed metal salt solution is 120ml / min, and the hydrogen is adjusted after the reaction starts. The flow rate of sodium oxide solution is used to stabilize the pH value of the reaction system to 10....

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Abstract

The invention provides a nickel-cobalt binary precursor and a preparation method thereof. According to the invention, a batch-type process is adopted, and the nickel-cobalt binary precursor which is free of surface cracks, large in particle size and high in sphericity degree is synthesized in two stages through a hydroxide co-deposition method. The pH value of the system is continuously increased along with the increase of the particle size in the growth stage of the precursor, so that two primary particles with different sizes grow on the surfaces of the secondary particles, and the cracking phenomenon caused by uneven stress between the primary particles is solved. The method provided by the invention has no additional cost, the prepared nickel-cobalt binary precursor D50 is 15-20 microns, the tap density is 1.9-2.2 g / cm<3>, the specific surface area is 6-12 m<2> / g, the product physical index is excellent, the consistency is high, the technological process is stable, and the precursor material is an excellent nickel-cobalt-aluminum positive electrode precursor material.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery materials, and in particular relates to a nickel-cobalt binary precursor and a preparation method thereof. Background technique [0002] Against the background of the energy crisis and increasingly stringent global carbon emission policies, the lithium-ion battery industry has achieved rapid development, and the standards of lithium-ion batteries have been continuously improved. Among them, nickel-cobalt-manganese and nickel-cobalt-aluminum ternary lithium batteries occupy a dominant position in the high-end market. Compared with nickel-cobalt-manganese ternary lithium batteries, nickel-cobalt-aluminum ternary lithium batteries have more advantages in terms of specific capacity, high voltage and cycle performance. However, the synthesis process of nickel-cobalt-aluminum precursor materials is relatively complicated, the technical difficulty is high, and the domestic development is rel...

Claims

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Application Information

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IPC IPC(8): C01G53/00H01M4/525H01M10/0525
CPCC01G53/00H01M4/525H01M10/0525C01P2004/80C01P2004/61C01P2006/11C01P2004/03C01P2006/12C01P2004/32Y02E60/10
Inventor 刘宙黎力孟立君胡志兵张海燕吴泽盈曾永详何绪锋
Owner JINCHI ENERGY MATERIALS CO LTD
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