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Ternary precursor and preparation method and application thereof

A precursor and reaction technology, applied in the field of ternary precursors and their preparation, can solve the problems of poor circulation, spheroids prone to microcracks, low capacity, etc., and achieves the effects of small DCR, uniform primary particle distribution and low sintering temperature

Active Publication Date: 2022-01-04
GUANGDONG JIANA ENERGY TECH CO LTD +1
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  • Abstract
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Problems solved by technology

[0004] The purpose of this application is to provide a ternary precursor and its preparation method and application, aiming to solve the problems in the prior art that the sphere of the ternary precursor material is prone to microcracks, resulting in low capacity, poor circulation and other unstable properties

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  • Ternary precursor and preparation method and application thereof

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preparation example Construction

[0036] The second aspect of the embodiment of the present application provides a method for preparing a ternary precursor, including the following steps:

[0037] S01. Provide the first mixed solution of nickel ions, cobalt ions, manganese ions, soluble salt mixed solution, precipitant, complexing agent and bottom liquid, pass inert gas to create micro-nano bubble aqueous solution conditions, carry out the first mixed reaction to obtain the first For the precipitate, when the median particle size of the first precipitate reaches the first target particle size, the feeding is stopped and aging treatment is performed to obtain the ternary precursor crystal nucleus;

[0038] S02. The ternary precursor crystal nucleus, nickel ion, cobalt ion, manganese ion soluble salt mixed solution, precipitant and complexing agent are subjected to the second mixed reaction to obtain the second precipitate, when the median particle size of the second precipitate When the diameter reaches the sec...

Embodiment 1

[0075] A preparation method of a ternary cathode material precursor, comprising the following steps:

[0076] (1) The total molar weight of nickel, cobalt and manganese is 1.5mol / L, the molar ratio of nickel, cobalt and manganese is 80:10:10, mixed solution of sulfate, 32wt% NaOH solution, 13.5wt% ammonia Three kinds of materials, such as aqueous solution, are fed at a uniform speed by a metering pump at the same time, and are respectively transported to the reaction kettle containing the bottom liquid. The temperature of the reaction system is controlled at 50°C, protected by a nitrogen atmosphere, and the nitrogen flow rate of the micro-nano bubble machine is 0.3L / h. The reaction process The pH is 11.0-11.50, the ammonium root concentration is 1.0-2.0g / L, the stirring speed is 200rpm, and the material in the reactor reaches 80% of the effective volume of the reactor to stop feeding. Among them, the bottom solution has an ammonium root concentration of 2.0-3.0g / L, a pH of 10....

Embodiment 2

[0081] A preparation method of a ternary cathode material precursor, comprising the following steps:

[0082] (1) The total molar weight of nickel, cobalt and manganese is 2.0mol / L, the molar ratio of nickel, cobalt and manganese is 90:0.5:0.5 sulfate mixed solution, 32wt% NaOH solution, 13.5wt% ammonia solution The three materials are fed at a uniform speed by the metering pump at the same time, and are respectively transported to the reaction kettle containing the bottom liquid. The temperature of the reaction system is controlled at 60°C, protected by a nitrogen atmosphere, and the nitrogen flow rate of the micro-nano bubble machine is 0.5L / h. The pH of the reaction process At 11.0-11.50, the ammonium root concentration is 1.5-2.5g / L, the stirring speed is 200rpm, and the material in the reactor reaches 80% of the effective volume of the reactor to stop feeding. Among them, the bottom liquid has an ammonium root concentration of 3.0-4.0g / L, a pH of 10.90-11.20, and a temper...

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Abstract

The invention relates to the technical field of lithium ion battery materials, in particular to a ternary precursor and a preparation method and application thereof. The ternary precursor is of a core-shell structure, the inner core is of a loose and porous compact orange slice type structure, the shell is of a center epitaxial amplification shape, and the fan-shaped central angle of the orange slice type structure is 10-30 degrees; the core of the obtained ternary precursor particle has a loose and porous structure, so that the internal stress is reduced in the charging and discharging process of a lithium battery, and microcracks of the particle are avoided; the shell is compact and is of an orange slice structure, lithium salt can permeate into the core of the ternary precursor more easily in the sintering process of preparing the positive electrode material, the diffusion mass transfer resistance is smaller, the sintering temperature is lower, the dynamic performance is better, and use is more facilitated; the material is large in tap density, good in sphericity degree, uniform in primary particle distribution and narrow in particle size distribution, and a good premise and foundation are provided for subsequent preparation of high-quality positive electrode materials.

Description

technical field [0001] The application belongs to the technical field of lithium-ion battery materials, and in particular relates to a ternary precursor and its preparation method and application. Background technique [0002] New energy vehicles have become the main direction of the transformation and development of the global auto industry and an important engine to promote the sustainable growth of the world economy. As the power battery at the heart of new energy vehicles, it is urgent to solve the pain points of cruising range and parity. In order to further improve the energy density of nickel-cobalt-manganese ternary cathode materials, high-nickel is one of the most mature and most acceptable technological advancement directions in the identifiable path. High-nickelization deepens technical barriers, and high-nickel ternary precursors have become enterprises focus, the degree of competition has further increased. High nickel ternary is a technological change in the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/00
CPCC01G53/006C01P2004/61C01P2006/12C01P2006/11C01P2004/32C01P2002/72C01P2004/03C01P2004/04C01P2006/40Y02E60/10
Inventor 黄亚祥郑江峰张颖张晨卫强
Owner GUANGDONG JIANA ENERGY TECH CO LTD
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