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Electrode material surface coating method and application thereof

An electrode material and surface coating technology, which is applied to battery electrodes, circuits, electrical components, etc., can solve problems such as erosion damage, electrode material side reaction surface, etc.

Inactive Publication Date: 2016-11-09
SHENZHEN CITY BATTERY NANOMETER TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the current coating methods generally have the problems of side reactions and surface erosion damage on the surface of electrode materials, so it is necessary to develop a new surface coating method to solve the problems in the prior art

Method used

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  • Electrode material surface coating method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] (1) Synthesize high-nickel NCM (Ni:Co:Mn=8:1:1) precursor by co-precipitation method, mix lithium source (LiOH) according to Li / (Ni+Co+Mn) ratio of 1.05, after sintering Obtain the electrode material LiNi 0.8 co 0.1 mn 0.1 o 2 As a matrix, the matrix material is crushed, sieved and dried before being coated, and collected for future use.

[0064] (2) Weigh DMF and methanol respectively and mix them at a volume ratio of 1:1 to make a uniform solvent. 20g of electrode material LiNi 0.8 co 0.1 mn 0.1 o 2 Add it to the above homogeneous solvent, stir and disperse evenly to obtain a dispersion system.

[0065](3) Take by weighing cobalt nitrate 0.36g and terephthalic acid 0.075g respectively, and join it in the dispersion system that step (2) obtains, ultrasonic 30min, obtain mixed liquor, wherein cobalt nitrate and terephthalic acid molar ratio It is 3:1.

[0066] (4) Transfer the mixed solution of step (3) into a hydrothermal kettle, tighten the seal, place in a c...

Embodiment 2

[0070] (1) Synthesize high-nickel NCA (Ni:Co:Al=0.815:0.15:0.035) precursor by co-precipitation method, mix lithium source (LiOH) according to Li / (Ni+Co+Al) ratio of 1.03, after sintering Obtain the electrode material LiNi 0.15 co 0.15 al 0.035 o 2 As a matrix, the matrix material is crushed, sieved and dried before being coated, and collected for future use.

[0071] (2) Measure 250mL of methanol, weigh 1.4g of magnesium nitrate, add it to methanol, stir and dissolve to obtain a solution, and weigh 100g of electrode material LiNi 0.15 co 0.15 al 0.035 o 2 Add to the above solution, fully disperse to obtain dispersion system I;

[0072] (3) Take another 250 mL of methanol, add 3 g of formic acid into it, stir and mix well to obtain the dispersion system II.

[0073] (4) Pour dispersion system I and dispersion system II into the reaction kettle and mix them, add 3g of triethylamine, shake well, seal, and let stand at room temperature for 24 hours. After the reaction, ta...

Embodiment 3

[0077] (1) Synthesize high-nickel NCM (Ni:Co:Mn=6:2:2) precursor by co-precipitation method, mix lithium source (LiOH) according to Li / (Ni+Co+Mn) ratio of 1.08, after sintering Obtain the electrode material LiNi 0.6 co 0.2 mn 0.2 o 2 as a base.

[0078] (2) Add 400 mg of aluminum nitrate nonahydrate, 300 mg of trimesic acid, 200 mg of sodium hydroxide, and 10 mL of deionized water into a polytetrafluoroethylene reactor, stir until uniform, and obtain a dispersion.

[0079] (3) Add 100g electrode material LiNi to the dispersion system 0.6 co 0.2 mn 0.2 o 2 , fully dispersed evenly to obtain a mixed solution.

[0080] (4) Put the mixed liquid in step (3) into the reaction kettle and move it into an oven at 150°C, react for 48 hours, take it out after cooling, and centrifuge with methanol solvent to obtain the product precursor.

[0081] (5) After completing the above steps, vacuum-dry the product precursor obtained in step (4) at 100°C, then put it into a crucible, put ...

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Abstract

The invention provides an electrode material surface coating method and application thereof. The method includes steps: (1) enabling in-situ growth of a metal organic skeleton on the surface of an electrode material; (2) subjecting the metal organic skeleton coated electrode material to heat treatment to obtain an oxide coated electrode material. Since the metal organic skeleton material with appropriate morphologic size and target ion metal clusters is designed as a precursor and converted into nanometer oxide after heat treatment, effective coating of the electrode material with the metal oxide and regulation of structure and coating amount of the metal oxide can be realized, more surface coating substances and structures difficult to realize by traditional methods can be introduced, and the electrode material surface coating method is a novel electrode material surface coating means.

Description

technical field [0001] The invention belongs to the technical field of preparation of electrode materials and lithium ion batteries, relates to a surface coating method of electrode materials and its application, in particular to a method of surface coating of electrode materials, and oxide coating prepared by the method. An electrode material, and a lithium ion battery comprising the oxide-coated electrode material. Background technique [0002] Lithium-ion batteries have been widely cited because of their high energy density, excellent cycle performance, and stable operating voltage. The market demand for lithium-ion battery applications is still expanding. Traditional consumer electronics products, power grid peak-shaving energy storage, start-stop power supplies, electric vehicles and other fields have higher requirements for the specific energy and cycle performance of lithium-ion batteries. Material surface coating is an important method to improve the application of ...

Claims

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Application Information

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IPC IPC(8): H01M4/139H01M4/1391
CPCH01M4/139H01M4/1391Y02E60/10
Inventor 杨成杨顺毅任建国黄友元
Owner SHENZHEN CITY BATTERY NANOMETER TECH
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