Method for preparing electrode material surface uniform modified layer based on contact angle test

An electrode material and surface modification technology, which is applied in the field of preparing a uniform modification layer on the surface of electrode materials based on a contact angle test, can solve problems such as expensive coating costs, achieve industrial application, be easy to repeat, and improve the stability of electrode structure and cycle stability. sexual effect

Active Publication Date: 2018-10-12
HENAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although atomic layer deposition and pulsed laser deposition are easy to produce a better and more uniform cladding layer, they both require special equipment, making the cladding cost relatively expensive

Method used

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  • Method for preparing electrode material surface uniform modified layer based on contact angle test
  • Method for preparing electrode material surface uniform modified layer based on contact angle test

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment 1: In lithium-rich layered material Li[Li 0.2 Ni 0.17 co 0.07 mn 0.56 ]O 2 The surface is coated with lithium stannate (Li 2 SnO 3 ) suitable solvent and concentration

[0018] 1. Weigh 0.08g of lithium-rich material Li[Li 0.2 Ni 0.17 co 0.07 mn 0.56 ]O 2 After grinding for 30 minutes in a mortar, add an appropriate amount of NMP (N-methylpyrrolidone), grind evenly and apply it on a flat and clean aluminum foil, then fully dry it in a vacuum drying oven, take it out and slice the electrode piece;

[0019] 2. The three solvents of water, absolute ethanol and ethylene glycol were used to test the contact angle of the electrode sheet cut in the above 1, and the ethylene glycol solvent with the smallest contact angle was selected (the contact angle was 67.7°);

[0020] 3. Dissolve the ethylene glycol solvents selected in the above 2 to prepare Li 2 SnO 3 The precursor material (anhydrous tin tetrachloride (SnCl 4 ·5H 2 O), lithium acetate (CH 3 CO...

Embodiment 2

[0023] Embodiment 2: in spinel material (LiNi 0.5 mn 1.5 o 4 ) coated with yttrium phosphate (YPO 4 ) suitable solvent and concentration

[0024] 1. Weigh 0.08g of spinel material LiNi 0.5 mn 1.5 o 4After grinding for 30 minutes in a mortar, add an appropriate amount of NMP (N-methylpyrrolidone), grind evenly and apply it on a flat and clean aluminum foil, then fully dry it in a vacuum drying oven, take it out and slice the electrode sheet;

[0025] 2. Test the contact angle of the above-mentioned 1-cut electrode sheet with water, absolute ethanol, and ethylene glycol, and select the alcohol solvent with the smallest contact angle (the contact angle is 64.3°);

[0026] 3. Dissolve the alcohol solvents selected above to prepare YPO 4 The precursor material (yttrium nitrate hexahydrate (Y(NO 3 ) 3 ·6H 2 O), ammonium dihydrogen phosphate (NH 4 h 2 PO 4 )) and make a series of concentration gradients (0.1, 0.2, 0.5, 1, 2, 5, 10mol / L), and then conduct a contact angle ...

Embodiment 3

[0029] Embodiment 3: in lithium-rich layered material Li[Li 0.2 Ni 0.17 co 0.07 mn 0.56 ]O 2 The surface is coated with zirconium fluoride (ZrF 4 ) suitable solvent and concentration

[0030] 1. Weigh 0.08g of lithium-rich material Li[Li 0.2 Ni 0.17 co 0.07 mn 0.56 ]O 2 After grinding for 30 minutes in a mortar, add an appropriate amount of NMP (N-methylpyrrolidone), grind evenly and apply it on a flat and clean aluminum foil, then fully dry it in a vacuum drying oven, take it out and slice the electrode sheet;

[0031] 2. The three solvents of water, absolute ethanol and ethylene glycol were used to test the contact angle of the electrode sheet cut in the above 1, and the ethylene glycol solvent with the smallest contact angle was selected (the contact angle was 67.7°);

[0032] 3. Dissolve the above selected ethylene glycol solvents to prepare ZrF 4 The precursor material (anhydrous zirconium nitrate (Zr(NO 3 ) 4 ·5H 2 O) and ammonium fluoride (NH 4 F)), and m...

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Abstract

The invention provides a method for preparing an electrode material surface uniform modified layer based on a contact angle test, belongs to the technical field of surface modification, and relates tothe wetting property of a coating precursor liquid on an electrode material surface. The method employs the contact angle test, a suitable solvent and concentration required for surface modificationare determined by the size of the contact angle, thereby obtaining the coating precursor liquid having better wettability. The method provided by the invention can achieve uniform surface coating, thereby effectively improving the structural stability, thermal safety and cycling stability of the material. The invention has a simple operation flow, low cost and good application value.

Description

technical field [0001] The invention relates to the test of the wetting characteristics of materials to a specific solution, which belongs to the technical field of material surface modification, specifically testing the contact angle between different solvents and different concentrations of surface modification precursor fluids and the surface of electrode materials, and then optimizing the surface modification effect of electrode materials. The scheme can obtain a more uniform surface modification layer and better improve the electrochemical performance of lithium-ion batteries. Background technique [0002] Due to its high energy density, high working voltage, long cycle life and no pollution, lithium-ion batteries have been rapidly developed in portable electronic devices, and their applications in the fields of power vehicles and energy storage have also begun. In lithium-ion batteries, the cost of cathode materials accounts for 40% of the cost of the entire battery an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/62H01M10/0525G01N13/00
CPCG01N13/00H01M4/366H01M4/628H01M10/0525Y02E60/10
Inventor 白莹王丹丹赵慧玲李国强李胜军
Owner HENAN UNIVERSITY
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