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Blended polymer coated high-nickel ternary positive electrode material and preparation method thereof

A technology of blending polymers and positive electrode materials, applied in the direction of positive electrodes, active material electrodes, electrical components, etc., can solve the problems of electrochemical performance deterioration, cycle performance weakening, electrical performance impact, etc. The effect of reducing the resistance of lithium/lithium intercalation and inhibiting dissolution

Active Publication Date: 2019-11-08
CENT SOUTH UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0003] Although ternary cathode materials have unparalleled various excellent properties, as the nickel content of layered high-nickel cathode materials increases, the structural changes caused by their own intrinsic defects make their electrical properties greatly affected to a certain extent. influences
The layered high-nickel cathode material is prone to lithium-nickel mixed row during the reaction process, which leads to the release of active oxygen, causing cell flatulence, and a large amount of lithium-containing compounds (Li 2 O, LiOH, etc.), react with HF in the electrolyte at the same time, and dissolve transition metal ions, resulting in weakened cycle performance, which eventually deteriorates the overall electrochemical performance and fails.
In addition, during the working cycle of the battery, especially under special conditions such as high temperature and high voltage, the layered high-nickel cathode material is in direct contact with the electrolyte, so that the oxidized Ni 4+ The irreversible side reaction with the electrolyte leads to the collapse of the structure, and as the impedance of the material itself continues to increase, it may cause very serious safety problems
[0004] Generally speaking, the use of coating materials is an effective method to improve the extended cycle stability of layered high-nickel cathode materials. Common coating materials include Li 3 PO 4 , LiF, polyaniline, polypyrrole, polyethylene glycol, etc. can effectively improve the cycle stability of positive electrode materials, but the role of these coating materials is single, some can be used as conductors of lithium ions, and some can be used as conductors of electrons, and cannot Combining their respective advantages well to improve the electrochemical performance of high-nickel cathode materials

Method used

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  • Blended polymer coated high-nickel ternary positive electrode material and preparation method thereof
  • Blended polymer coated high-nickel ternary positive electrode material and preparation method thereof
  • Blended polymer coated high-nickel ternary positive electrode material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Accurately weigh LiOH·H 2 Dissolve 11.50g of O, 25mL of acrylic acid, 25mL of aniline, and isopropanol (1 / 10,000th of the amount of monomer) in methanol so that the monomer concentration is about 15-20%, and stir in a water bath at 50°C until LiOH·H 2O is completely dissolved; dissolve 0.25g of azobisisobutyronitrile in methanol, 61.3g of ammonium persulfate in dilute hydrochloric acid, adjust the pH to between 3 and 4, and place them in constant pressure dropping funnels. Add the methanol solution of azobisisobutyronitrile dropwise within 30 minutes in a water bath at 75°C, and react for about 1 hour. After the white precipitate appears, add dilute hydrochloric acid solution of ammonium persulfate dropwise within 20 minutes, and continue the reaction for 2 to 5 hours. Evaporate methanol and water to dryness, wash with deionized water, absolute ethanol, and acetone in sequence until the filtrate is colorless, transparent and clear, filter with suction, and dry in vacuum...

Embodiment 2

[0036] Accurately weigh LiOH·H 2 Dissolve 5.75g of O, 12.5mL of acrylic acid, 12.5mL of pyrrole, and isopropanol (one ten-thousandth of the amount of monomer) in methanol so that the monomer concentration is about 15-20%, and stir in a water bath at 50°C until LiOH ·H 2 O is completely dissolved; dissolve 0.125g of azobisisobutyronitrile in methanol, and 22.34g of ammonium persulfate in dilute hydrochloric acid, adjust the pH to between 3 and 4, and place them in constant-pressure dropping funnels. Add the methanol solution of azobisisobutyronitrile dropwise within 30 minutes in a water bath at 75°C, and react for about 1 hour. After the white precipitate appears, add dilute hydrochloric acid solution of ammonium persulfate dropwise within 20 minutes, and continue the reaction for 2 to 5 hours. Evaporate methanol and water to dryness, wash with deionized water, absolute ethanol, and acetone in sequence until the filtrate is colorless, transparent and clear, filter with suctio...

Embodiment 3

[0039] Accurately weigh LiOH·H 2 O 11.50g, maleic acid 25mL, aniline 25mL, and isopropanol (1 / 10,000th of the amount of monomer) were dissolved in methanol so that the monomer concentration was around 15-20%, and stirred in a water bath at 50°C until LiOH·H 2 O is completely dissolved; dissolve 0.25g of azobisisobutyronitrile in methanol, 61.3g of ammonium persulfate in dilute hydrochloric acid, adjust the pH to between 3 and 4, and place them in constant pressure dropping funnels. Add the methanol solution of azobisisobutyronitrile dropwise within 30 minutes in a water bath at 75°C, and react for about 1 hour. After the white precipitate appears, add dilute hydrochloric acid solution of ammonium persulfate dropwise within 20 minutes, and continue the reaction for 2 to 5 hours. Evaporate methanol and water to dryness, wash with deionized water, absolute ethanol, and acetone in sequence until the filtrate is colorless, transparent and clear, filter with suction, and dry in vac...

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Abstract

The invention discloses a blended polymer coated high-nickel ternary positive electrode material and a preparation method thereof. The blended polymer of at least two polymers with different properties is used for coating the high-nickel ternary positive electrode material; the blended polymer is formed by at least one of lithium polyacrylate and polylithium methacrylate, polymaleic acid lithium,poly (methyl vinyl ether copolymerized maleic acid) lithium and polylithium fumarate and at least one of polyaniline, polypyrrole, polythiophene, polyacetylene, polyphenylene ethylene and polydiyne; said materials are placed in an acidic medium, a water-soluble initiator is adopted to initiate monomers of the blended polymer to simultaneously undergo oxidative polymerization, thus obtaining the blended polymer. According to the method, a layer of blended polymer film with conductive ions and conductivity is formed on the surface of the high-nickel ternary positive electrode material, so that certain moisture can be resisted, dissolution of transition metal ions in an electrolyte is inhibited, and the high-nickel ternary positive electrode material has the characteristics of high specific capacity, high multiplying power and long cycle life.

Description

technical field [0001] The invention belongs to the technical field of preparation of lithium-ion battery electrode materials, and relates to a surface-modified lithium-ion battery high-nickel ternary positive electrode material and a preparation method thereof, in particular to a kind of polymer using two or more different properties A high-nickel ternary cathode material coated with a blend and a preparation method thereof. Background technique [0002] In recent years, as the country promulgates relevant measures and regulations such as the "Parallel Management Measures for Average Fuel Consumption of Passenger Car Enterprises and New Energy Vehicle Points" and the development requirements brought about by the technological innovation of electric vehicles, the energy density and safety of power batteries Performance and stability put forward higher requirements, layered high-nickel cathode material LiNi 1-x-y co x mn y o 2 (1 / 3>x>1 / 20, 1 / 3>y>1 / 20) is the c...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/624H01M4/628H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 曹雁冰胡国荣杜柯彭忠东张志勇甘掌根
Owner CENT SOUTH UNIV
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