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Ternary precursor and preparation method and application thereof

A precursor and directional growth technology, applied in chemical instruments and methods, electrical components, inorganic chemistry, etc., can solve the problems of unfavorable product property stability, microcracks and fragmentation, and complicated preparation process, so as to improve the first charge and discharge performance and Cycle performance, less cracks, and improved cycle characteristics

Pending Publication Date: 2022-02-25
GUANGDONG JIANA ENERGY TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The purpose of this application is to provide a ternary precursor and its preparation method and application, aiming at solving the defects of the current directional growth ternary precursor preparation method, which leads to the easy microcrack and breakage of the obtained product, and The preparation process is complicated, which is not conducive to the stability of product properties

Method used

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  • Ternary precursor and preparation method and application thereof
  • Ternary precursor and preparation method and application thereof
  • Ternary precursor and preparation method and application thereof

Examples

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preparation example Construction

[0040] The second aspect of the embodiment of the present application provides a preparation method for directional growth of a ternary precursor, including the following steps:

[0041] S01. Under inert atmosphere conditions, feed nickel, cobalt, manganese or nickel, cobalt, aluminum soluble salts, the first complexing agent, the first precipitating agent and the bottom liquid to prepare the first mixed solution and carry out the first precipitation reaction, When the median particle size of the first precipitate in the first mixed solution reaches the first target particle size, stop feeding, and perform solid-liquid separation after standing to obtain a ternary precursor crystal nucleus;

[0042] S02. Pure water, the second complexing agent, the second precipitating agent and the ternary precursor crystal nucleus are formulated into the second mixed solution, and the pH and ammonium root concentration conditions of the second mixed solution are adjusted, and then nickel, cob...

Embodiment 1

[0084] A preparation method for directional growth of a ternary precursor, comprising the steps of:

[0085] (1) Provide nickel, cobalt, manganese soluble salt solution, complexing agent solution, precipitant solution and bottom liquid; wherein, the total concentration of nickel, cobalt, manganese soluble salt solution is 1.5mol / L, nickel, cobalt, manganese three The molar ratio of the elements is 96:2:2; the complexing agent solution is selected from the ammonia solution with a concentration of 7mol / L, the precipitant solution is selected from the sodium hydroxide solution with a concentration of 12mol / L, and the bottom liquid is selected from the ammonia solution containing ammonium ions. alkaline aqueous solution;

[0086] (2) Add a bottom solution with a certain pH, temperature, and ammonium root concentration to the reactor, keep feeding nitrogen, control a certain speed, and then add the metal salt solution, precipitant, and complexing agent to the reactor in parallel to...

Embodiment 2

[0091] A preparation method for directional growth of a ternary precursor, comprising the steps of:

[0092] (1) Provide nickel, cobalt, aluminum soluble salt solution, complexing agent solution, precipitant solution and bottom liquid; wherein, the total concentration of nickel, cobalt, aluminum soluble salt solution is 1.5mol / L, nickel, cobalt three elements molar The ratio is 90:10; the complexing agent solution is selected from the ammonia solution with a concentration of 7mol / L, the precipitant solution is selected from the sodium hydroxide solution with a concentration of 12mol / L, and the bottom liquid is selected from the alkaline aqueous solution containing ammonium ions;

[0093] (2) Add a bottom solution with a certain pH, temperature, and ammonium root concentration to the reactor, keep feeding nitrogen, control a certain speed, and then add the metal salt solution, precipitant, and complexing agent to the reactor in parallel to control and stabilize the pH , ammoniu...

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Abstract

The invention relates to the technical field of lithium ion batteries, in particular to a ternary precursor and a preparation method and an application thereof. The ternary precursor comprises a compact inner core and a loose radial shell which extends and grows from the inner core. As the obtained ternary precursor shell is loose and radial, stress can be released through the radial shell in the use process, so that cracks caused by particle breakage during circulation are avoided, the circulation characteristic of the ternary precursor is further improved, the loose shell can increase diffusion channels of lithium ions, When the material is used for preparing the positive electrode material of the lithium ion battery, the first charge-discharge performance and the cycle performance of the lithium ion battery can be remarkably improved.

Description

technical field [0001] The application belongs to the technical field of lithium-ion batteries, and in particular relates to a ternary precursor and its preparation method and application. Background technique [0002] At present, the synthesis method of ternary cathode materials is to firstly form secondary particle balls by co-precipitation reaction from nickel cobalt manganese hydroxide or nickel cobalt aluminum hydroxide primary particles, and then synthesize nickel cobalt manganese acid by mixing lithium and high temperature solid state reaction Lithium or nickel-cobalt lithium aluminate ternary cathode materials, methods to improve the cracking and thermal stability of ternary cathode materials mainly include precursor synthesis optimization, coating and doping. [0003] In terms of precursor synthesis optimization, there is currently a means to grow the primary particles of the material in a radial shape to reduce the internal stress during the charge and discharge pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/00C01G53/04H01M4/505H01M4/525H01M10/0525
CPCC01G53/006C01G53/04C01G53/00H01M4/505H01M4/525H01M10/0525H01M2004/028C01P2004/61C01P2004/03Y02E60/10
Inventor 黄仁忠郑江峰高琦张晨
Owner GUANGDONG JIANA ENERGY TECH CO LTD
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