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A modified nickel-cobalt-aluminum ternary positive electrode material and preparation method thereof

A cathode material, nickel-cobalt-aluminum technology, applied in the field of modified nickel-cobalt-aluminum ternary cathode material and its preparation, can solve the problem of unfavorable nickel-cobalt-aluminum ternary cathode material rate performance and cycle life, difficult to meet market demand and industrialization Production, easy absorption of moisture and carbon dioxide, etc., to achieve cycle stability, high energy density and bulk density, low requirements for equipment and reaction conditions, and improved stability and electrochemical performance.

Active Publication Date: 2021-08-17
ZHEJIANG WELLY ENERGY CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, studies have found that nickel-cobalt-aluminum ternary cathode materials have the defect of poor high-temperature cycle performance. The active material will be corroded by hydrofluoric acid under high-temperature conditions in contact with the electrolyte, destroying the interface structure, and causing metal Ni, Co, Al Dissolution in the electrolyte, causing capacity attenuation
[0004] At present, coprecipitation and solid-state sintering methods are mainly used to prepare nickel-cobalt-aluminum ternary cathode materials. The materials synthesized by the above methods are relatively alkaline and easily absorb moisture and carbon dioxide, which is not conducive to the rate performance and cycle of nickel-cobalt-aluminum ternary cathode materials. Lifespan will also be greatly affected, making it difficult to meet market demand and industrialized production

Method used

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  • A modified nickel-cobalt-aluminum ternary positive electrode material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0024] A method for preparing a modified nickel-cobalt-aluminum ternary positive electrode material, comprising the steps of:

[0025] 1) Add cobalt sulfate, nickel citrate, lithium acetate and aluminum nitrate to citric acid to make 4mol L -1 mixed salt solution, then add ammonia water, adjust the pH of the solution to 10, and then spray dry the solution, and finally obtain precursor particles that are uniformly mixed at the molecular level; Keep warm for 3 hours, then heat up to 700°C and sinter for 12 hours, cool naturally to room temperature, grind the product, and pass through a 200-mesh sieve to obtain a nickel-cobalt-aluminum ternary positive electrode material; the cobalt sulfate, nickel citrate, lithium acetate, nitric acid The molar ratio of aluminum is 0.3:2:1.7:0.04;

[0026] 2) Disperse 20 g of fluorinated graphene and 1 g of 3-chloropropylmethyldimethoxysilane in 50 g of ethanol, stir for 1 hour, then add 1 g of tetrakis(dimethylamino)titanium, and stir at 40°C ...

Embodiment 2

[0031] A method for preparing a modified nickel-cobalt-aluminum ternary positive electrode material, comprising the steps of:

[0032] 1) Add cobalt nitrate, lithium carbonate, nickel acetate and aluminum nitrate to citric acid to make 4.3mol L -1 mixed salt solution, and then add ammonia water to adjust the pH of the solution to 11, and then spray-dry the solution to finally obtain precursor particles that are uniformly mixed at the molecular level; Keep warm for 3.5 hours, then heat up to 730°C and sinter for 13 hours, cool naturally to room temperature, grind the product, and pass through a 250-mesh sieve to obtain a nickel-cobalt-aluminum ternary positive electrode material; the cobalt nitrate, lithium carbonate, nickel acetate, aluminum nitrate The molar ratio is 0.3:2:1.7:0.04.

[0033] 2) Disperse 23 g of fluorinated graphene and 1 g of 3-chloropropylmethyldimethoxysilane in 65 g of ethanol, stir for 1.2 hours, then add 1.5 g of tetrakis(dimethylamino)titanium to it, a...

Embodiment 3

[0038] A method for preparing a modified nickel-cobalt-aluminum ternary positive electrode material, comprising the steps of:

[0039] 1) Add cobalt chloride, lithium oxalate, nickel chloride, and aluminum nitrate to citric acid to make 4.5mol L -1mixed salt solution, then add ammonia water, adjust the pH of the solution to 10, and then spray-dry the solution to finally obtain precursor particles that are uniformly mixed at the molecular level; Keep warm for 4 hours, then heat up to 750°C and sinter for 13.5 hours, cool naturally to room temperature, grind the product, and pass through a 300-mesh sieve to obtain a nickel-cobalt-aluminum ternary positive electrode material; the cobalt chloride, lithium oxalate, nickel chloride, The molar ratio of aluminum nitrate is 0.3:2:1.7:0.04.

[0040] 2) Disperse 26 g of fluorinated graphene and 1 g of 3-chloropropylmethyldimethoxysilane in 85 g of ethanol, stir for 1.5 hours, then add 2 g of tetrakis(dimethylamino)titanium, and stir at ...

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Abstract

The invention provides a method for preparing a modified nickel-cobalt-aluminum ternary positive electrode material, comprising the following steps: 1) preparation of nickel-cobalt-aluminum ternary positive electrode material, 2) titanium-doped fluorinated graphene, tetrabutyl hexafluorophosphoric acid Preparation of ammonium co-modified nickel-cobalt-aluminum ternary cathode materials. The invention also discloses the modified nickel-cobalt-aluminum ternary positive electrode material prepared according to the preparation method of the modified nickel-cobalt-aluminum ternary positive electrode material and the lithium lithium battery using the modified nickel-cobalt-aluminum ternary positive electrode material as the positive electrode material. ion battery. Compared with the traditional nickel-cobalt-aluminum ternary cathode material in the prior art, the modified nickel-cobalt-aluminum ternary cathode material prepared by the present invention has lower production cost, higher gram capacity, cycle stability, energy density and bulk density , good conductivity, avoiding the dissolution of metal Ni, Co, Al in the electrolyte directly caused by the active material and the electrolyte, resulting in capacity fading. The cycle life is longer and the use is safer and more stable.

Description

technical field [0001] The invention relates to the technical field of positive electrode materials for lithium ion batteries, in particular to a modified nickel-cobalt-aluminum ternary positive electrode material and a preparation method thereof. Background technique [0002] With the depletion of fossil energy, energy issues have increasingly become a focus of attention. All countries in the world are constantly looking for cleaner and more environmentally friendly green energy. Among them, lithium batteries are widely used in mobile phones, portable computers, cameras, Cameras, electric vehicles and other fields, with the continuous expansion of application fields, put forward higher requirements for lithium-ion batteries in terms of energy density, rate performance and cycle life. [0003] Lithium-ion batteries include positive electrode materials, negative electrode materials, separators, electrolytes, and current collectors. Among them, the cathode material largely ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/485H01M4/525H01M4/625H01M10/0525Y02E60/10
Inventor 何小毛刘佩吴奎辰朱玉巧权学军吴清国
Owner ZHEJIANG WELLY ENERGY CORP
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