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A double-coated lithium battery positive electrode material and preparation method thereof

A positive electrode material, lithium battery technology, applied in the direction of battery electrodes, secondary batteries, chemical instruments and methods, etc., can solve the problems of inability to protect the material surface for a long time, unsatisfactory safety performance, hindering lithium ion deintercalation, etc., to achieve heat suppression Occurrence of runaway, enhanced force, effect of thin coating

Active Publication Date: 2022-05-06
TIANJIN B&M SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Researchers have tried various means to dope and coat high-nickel cathode materials to improve the surface stability of cathode materials, but these methods are still not ideal for improving safety performance
When coated with oxide, when the material is recycled, the oxide coating reacts with HF in the electrolyte or dissolves and falls off with the dissolution of transition metals, which cannot protect the surface of the material for a long time, resulting in poor safety.
When coated with a polymer, it can play a role of flame retardancy to a certain extent, but due to the poor conductivity of macromolecular organics, and the long-term interaction with the electrolyte, it will swell, lose the protection of the surface, and hinder The deintercalation of lithium ions will also lead to a significant reduction in the capacity of the material

Method used

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  • A double-coated lithium battery positive electrode material and preparation method thereof
  • A double-coated lithium battery positive electrode material and preparation method thereof
  • A double-coated lithium battery positive electrode material and preparation method thereof

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preparation example Construction

[0032] A method for preparing a double-coated lithium battery positive electrode material, comprising the steps of:

[0033] 1) Mix the high-nickel precursor and the lithium source, and perform the first roasting, and the roasted product is crushed, washed, filtered, dried, sieved, and demagnetized to obtain the high-nickel material A; the lithium source is hydrogen One or both of lithium oxide and lithium carbonate;

[0034] 2) Mix the high-nickel material A, lithium salt, pore-forming agent and inorganic dispersant uniformly to obtain mixture B, wherein, in terms of mass ratio, high-nickel material A, lithium salt, pore-forming agent=100:(0.1~2 ): (0.1~0.4), mixture B is roasted for the second time to obtain mixture C; the roasting temperature is 100~250°C, and the roasting time is 30~60min;

[0035] 3) The adhesive is configured into a 1-5% adhesive solution, the mixture C is put into the adhesive solution, stirred for 0.5-1 hour, and then the mixture is filtered, dried, a...

Embodiment 1

[0054] Prepare a double-coated lithium battery positive electrode material, comprising the steps of:

[0055] 1) Weigh 452g lithium hydroxide monohydrate, 950g high-nickel ternary cathode material large particle precursor [Ni 90 co 06 mn 04 ](OH) 2 , put the material into a sagger, place it in a kiln for sintering with oxygen at 750°C for 15 hours, and after cooling, crush, wash, filter, dry, sieve, and demagnetize to obtain a high-nickel material A;

[0056] 2) Evenly disperse 1000g of high-nickel material A, 50g of lithium borate, and 4g of polyethylene glycol in deionized water. The mixture is fully mixed with a high-speed mixer to obtain mixture B. Filter and dry mixture B and put it into a sagger. Place in a kiln at 200°C and sinter for 1 hour under a nitrogen atmosphere to obtain mixture C;

[0057] 3) Configure a hydroxypropyl cellulose solution with a mass concentration of 3%, put the mixture C into the hydroxypropyl cellulose solution, stir for 1 hour, filter the ...

Embodiment 2

[0062] 1) Weigh 452g lithium carbonate, 950g high-nickel ternary cathode material large particle precursor [Ni 90 co 06 mn 04 ](OH) 2 , put the material into a sagger, place it in a kiln for sintering with oxygen at 750°C for 13 hours, and after cooling, crush, wash, filter, dry, sieve, and demagnetize to obtain a high-nickel material A;

[0063] 2) Evenly disperse 1000g of high-nickel material A, 45g of lithium lanthanum zirconium oxide, and 4g of ammonium bicarbonate in deionized water. The mixture is fully mixed with a high-speed mixer to obtain mixture B. After filtering and drying, put mixture B into a sagger, Place in a kiln at 150°C and sinter for 0.5h under nitrogen atmosphere to obtain mixture C;

[0064] 3) Prepare a hypromellose solution with a mass concentration of 4%, put the mixture C into the hypromellose, stir for 1 hour, filter the mixture, dry it, put it into a sagger, place it in a kiln at 500°C, Sintering under nitrogen atmosphere for 2h to obtain mixtu...

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Abstract

The invention provides a double-coated lithium battery positive electrode material and a preparation method thereof. The double-coated lithium battery positive electrode material has a core-shell structure, and the chemical formula of the core material is LiNi x co y mn z o 2 , where x>0.8, y>0, z>0, x+y+z=1; the shell material is composed of two layers, wherein the inner layer is a porous fast ion conductor lithium salt, and the pores of the porous fast ion conductor lithium salt A carbon layer is deposited inside, and the carbon layer is formed by carbonization of a binder; the outer layer is a high-molecular polymer, and the positive electrode material prepared by the present invention has two coating layers on the outside, and the porous fast ion conductor enhances the conductivity, and the high The molecular film can prevent the porous fast ion conductor from corroding and falling off during the cycle, and the addition of the binder not only increases the interlayer bonding force, but also further carbonizes into a carbon layer, making the material have a higher cycle retention rate and better performance. safety performance.

Description

technical field [0001] The invention relates to the field of lithium ion battery materials, in particular to a double-coated lithium battery positive electrode material and a preparation method thereof. Background technique [0002] In recent years, the development of the new energy industry is in full swing, providing a variety of solutions to control carbon dioxide emissions and curb global warming. As a solution, electric vehicles equipped with lithium-ion batteries have received extensive attention and strong support from governments around the world. With the wide-scale application of high-energy-density high-nickel materials, some safety hazards have also been exposed. [0003] With the substantial increase in the nickel content of the material, the H2→H3 phase transition of the material during the charging and discharging process is more serious, and the volume of the unit cell changes suddenly, resulting in microcracks, which cause the electrolyte to corrode the fres...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M4/505H01M4/52H01M10/0525C01G53/00C01B32/05C01G23/00C01G25/00C01G35/00C01B25/45C01B35/12
CPCY02E60/10
Inventor 吕菲徐宁赵晓童王春梅吴孟涛其他发明人请求不公开姓名
Owner TIANJIN B&M SCI & TECH
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