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LiNi0.6Co0.2Mn0.2O2 cathode material coated with Al2O3 surface and preparation method thereof

A positive electrode material, surface coating technology, applied in Al2O3 surface coated LiNi0.6Co0.2Mn0.2O2 positive electrode material and its preparation field, can solve problems such as uneven coating layer, and achieve the effect of improving electrochemical performance

Inactive Publication Date: 2020-04-14
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with Al 2 o 3 As a cladding material, generally only non-uniform cladding can be obtained

Method used

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  • LiNi0.6Co0.2Mn0.2O2 cathode material coated with Al2O3 surface and preparation method thereof
  • LiNi0.6Co0.2Mn0.2O2 cathode material coated with Al2O3 surface and preparation method thereof
  • LiNi0.6Co0.2Mn0.2O2 cathode material coated with Al2O3 surface and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Preparation [(Ni 0.5 co 0.2 mn 0.3 )](OH) 2 Precursor:

[0035] Weigh the NiSO with stoichiometric ratio (5:2:3) 4 、CoSO 4 and MnSO 4 , added to distilled water to form a mixed solution with a concentration of 2.0 mol / L. Prepare 1mol / L NH 3 ·H 2 O solution and 4.0mol / L NaOH solution, the mixed solution was passed into the co-precipitation reactor, and at the same time, 4.0 mol / L NaOH solution and 1mol / L NH 3 ·H 2 O solution as a chelating agent (NaOH and NH 3 ·H 2 O molar ratio is 2:1), keep the reactor temperature constant, control the stirring speed. The feeding speed is controlled at 0.8-1L / h, the stirring rate is controlled at about 300r / min, the temperature is controlled at 55±2°C, the pH value is 10.5, and the aging time of the final liquid-phase co-precipitation product is determined to be 8h to obtain nickel-cobalt Manganese composite hydroxide [(Ni 0.5 co 0.2 mn 0.3 )](OH) 2 ; prepared as above [(Ni 0.6 co 0.2 mn 0.2 )](OH) 2 . The above c...

Embodiment 2

[0049] The electrochemical performance of the prepared samples was measured with a full cell with a capacity of 52 Ah. The prepared positive electrode material, conductive agent acetylene black and binder polyvinylidene fluoride (PVDF) were mixed in a mass ratio of 80:10:10, and the solvent N-methylpyrrolidone was added to make a slurry. The slurry was coated on an aluminum foil with a thickness of 12 μm, then vacuum-dried at 120° C., rolled into a sheet, and graphite was used as the negative electrode material to make a negative electrode with a size of 148×199 mm. Electrolyte solvent composition DMC / EC / EMC=1:1:1 (volume ratio), containing lithium salt LiPF 6 1.0mol / L, the separator is a porous polyethylene film with a thickness of 20 μm, and a full battery with a capacity of 52Ah is assembled in an Ar gas-protected glove box.

[0050] The electrochemical performance was studied using an automatic constant current charge-discharge device (LAND CT2001A battery tester). The ...

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Abstract

The invention relates to a LiNi0.6Co0.2Mn0. 2O2 cathode material coated with an Al2O3 surface and a preparation method thereof. By utilizing the characteristic that an alkoxy aluminum compound is easyto react with a hydroxyl group, alkoxy aluminum groups are grafted on the surfaces of high-nickel ternary material particles, and the surface of the material is coated with a compact nano Al2O3 layerthrough a subsequent hydrolysis reaction and a thermal decomposition reaction, so that the aim of improving the electrochemical performance of the material is fulfilled; the capacity retention ratioof the Al2O3-coated NCM622 material is 84.62% under the 1C charge-discharge multiplying power (2.5-4.3 V) after 2500 cycles, and in addition, the multiplying power performance of the Al2O3-coated NCM622 material is superior to that of a point-coated material under different multiplying powers within the voltage range of 2.5-4.3 V.

Description

[0001] (1) Technical field [0002] The present invention relates to an Al 2 o 3 Coated LiNi 0.6 co 0.2 mn 0.2 o 2 Cathode material and preparation method thereof. [0003] (2) Background technology [0004] Since 2009, industries such as energy-saving and new energy vehicles and new energy storage have become key areas for national investment and development. Stimulated by multiple factors such as continuous breakthroughs in key technologies and industrial policy dividends, the business of power batteries and energy storage batteries has grown like a prairie fire, and my country's lithium battery industry has shown a thriving trend. The growing demand for high-energy and high-power-density lithium-ion batteries (LIBs) has stimulated enormous research interest in high-performance cathode materials. Cathode materials for next-generation lithium-ion batteries need to have higher energy density, longer cycle life, and better safety performance in electric vehicles and stati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/628H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 杜小红李国华王俊高云芳
Owner ZHEJIANG UNIV OF TECH