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 unspecified product characteristics, low solid content, etc., and achieve the effect of good consistency and high sphericity

Active Publication Date: 2021-12-14
JINCHI ENERGY MATERIALS CO LTD +2
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  • 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.

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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. The invention adopts a batch process, and synthesizes a nickel-cobalt binary precursor with no surface cracks, large particle size and high sphericity in two stages through a hydroxide co-deposition method. In the growth stage of the precursor, the pH value of the system is continuously increased with the increase of the particle size, so that two primary particles of different sizes grow on the surface of the secondary particles, which solves the cracking phenomenon between the primary particles due to uneven stress. The method described in the present invention has no additional cost, and the D50 of the nickel-cobalt binary precursor produced is 15-20 μm, the tap density is 1.9-2.2 g / cm³, the specific surface area is 6-12 m² / g, and the physical properties of the product are excellent , with high consistency and stable process, it is an excellent nickel-cobalt-aluminum cathode 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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Patent Type & Authority Patents(China)
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艳吴泽盈曾永详何绪锋
Owner JINCHI ENERGY MATERIALS CO LTD
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