Composite coated ternary precursor as well as preparation method and application thereof

A precursor and coating technology, which is applied in electrode manufacturing, electrical components, impregnation manufacturing, etc., can solve the problems of increased risk of material segregation, uneven coating material, and increased difficulty of operation, so as to reduce irreversible phase change, Uniform distribution of coatings and the effect of reducing oxygen defects

Pending Publication Date: 2022-03-25
GUANGDONG BRUNP RECYCLING TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Ternary lithium-ion cathode materials, including NCM materials and NCA materials, have high specific capacity and cycle performance, but their safety performance has been criticized.
In terms of coating, most of the coating elements are added in the sintering stage, which not only increases the number of sintering, but also the coating material is not uniform
Some methods are to coat the surface of the precursor, but generally it is to coat a single element, and the improvement effect is very limited, or after multi-stage coating, it increases the labor cost, and the operation difficulty increases. Increased risk of segregation

Method used

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  • Composite coated ternary precursor as well as preparation method and application thereof
  • Composite coated ternary precursor as well as preparation method and application thereof
  • Composite coated ternary precursor as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] This example has prepared a compound coated three-membered precursor, and the specific process is:

[0033] (1) Common precipitation prepared three-dollared precursor: Nickel-cobalt manganese mixed solution, precipitant, and complexing agent simultaneously prepared according to the ratio of molar ratio 82: 12: 6 In the reactor, an inert gas atmosphere is maintained, the stirring speed is 300r / min, the temperature is 70 ° C and the reaction pH are 11-12, and the precursor Ni is prepared by a coprecipitation reaction. 0.82 CO 0.12 Mn 0.06 (OH) 2 When the particles grow to 10.5 μm, the pH of the reaction system is adjusted to 7.0-8.0, and the mixture is stopped, and the reaction material is left within the kettle;

[0034] (2) Preparation of 1 mol / L of magnesium sulfate solution and 1 mol / L sodium silicate solution;

[0035] (3) Preparation of a composite coated precursor: Maintaining the stirring speed and temperature of the reaction kettle in step (1) unchanged, 5 L of...

Embodiment 2

[0040] This example has prepared a compound coated three-membered precursor, and the specific process is:

[0041] (1) Coprecipitation prepared three-membered precursor: nickel sulfate, cobalt sulfate, sulfate, magnesium sulfate mass molar ratio 0.82: 0.12: 0.05: 0.01 is dissolved in pure water, stir well, and formulated into 1.6 mol / L. Mixed metal salt solution; dissolve sodium hydroxide in pure water, then sodium silicate, stir well, and formulated into a doped precipitant of 5 mol / L, wherein the molar ratio of sodium hydroxide with sodium hydroxide is 200: 1; Add a proper amount of pure water to the reactor, turn on stirring and heating, the stirring speed is 300 r / min, the reaction temperature is 65 ° C, and ammonia water is added to the reactor, so that the ammonia concentration in the kettle is 6g / L. Further, a small amount of undoped sodium hydroxide solution regulating the pH of 11.4-11.6, and the nitrogen gas is continuously introduced into the kettle to prevent o...

Embodiment 3

[0046] This example has prepared a compound coated three-membered precursor, and the specific process is:

[0047] (1) Commonly precipitation prepared three-membered precursor: The nickel-cobalt manganese prepared according to 5: 2: 3 is mixed into the reactor, and the inert gas atmosphere is maintained. The stirring speed is 350 r / min, the temperature is 55 ° C and the reaction pH is 11-12, and the precursor Ni is prepared by a coprecipitation reaction. 0.5 CO 0.2 Mn 0.3 (OH) 2 When the particles grow to 5 μm, the pH of the reaction system is adjusted to 7.0-8.0, and the addition is stopped, and the reaction material is left within the kettle;

[0048] (2) Preparation 1.5 mol / L of copper sulfate solution and 1 mol / L of sodium molybdate solution;

[0049] (3) Preparation of composite coated precursors: Maintaining the stirring speed and temperature of the reaction kettle in step (1), the reaction of 3.9L sulfate solution and 5.9L molybdate solution simultaneously into the st...

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Abstract

The invention discloses a composite coated ternary precursor and a preparation method and application thereof, the material comprises a ternary precursor and a coating layer attached to the surface of the ternary precursor, and the coating layer is obtained by precipitation reaction of first metal ions and first polyanions; metal ions and polyanions can be subjected to precipitation reaction to form precipitates, the surface of the ternary precursor has a large number of active sites and high specific surface energy, and the precipitates are easy to adhere and grow, so that a uniformly distributed coating layer is formed on the surface of the ternary precursor. After the coated precursor is sintered into the positive electrode material, one part of the coating can form a protective layer on the surface of the material, so that the dissolution of Ni and Co is reduced, the side reaction of the positive electrode material and electrolyte is inhibited, and the irreversible phase change of the surface of the material is reduced, thereby improving the stability of the ternary material; and the other part of the coating can permeate into the material to form bulk phase doping.

Description

Technical field [0001] The present invention belongs to the field of a lithium ion battery positive material material, and in particular, the present invention relates to a compound coated three-membered precursor and its preparation method and application thereof. Background technique [0002] Three-dimensional lithium ion positive material, including NCM materials and NCA materials, although there is a high specific capacity and cycle performance, but its safety performance has been suffering. In recent years, electric vehicles using three-dimensional lithium-ion batteries have repeatedly occurred many times, making people's safety demand for power batteries. How to improve the safety performance of the ternary battery in the case of ensuring energy density, and become one of the mainstream research directions of electric vehicle power batteries. [0003] There is a coating, doping, nuclear shell structure, concentration gradient structure, tetram material, etc. in the modifica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/1397H01M4/04
CPCH01M4/366H01M4/5825H01M4/1397H01M4/0416H01M2004/028Y02E60/10
Inventor 李永光李长东刘更好李伟权阮丁山蔡勇
Owner GUANGDONG BRUNP RECYCLING TECH
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