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A method for surface modification of electrode materials

An electrode material and surface modification technology, applied in battery electrodes, secondary battery repair/maintenance, circuits, etc., can solve the problems of poor uniformity of the interface modification layer and high operating costs, and achieve a simple method, good cycle performance, and scale. The effect of chemical production

Active Publication Date: 2021-08-24
JIANGSU UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the defects of high operating cost and poor uniformity of the interface modification layer in the prior art, the object of the present invention is to provide a method for modifying the surface of electrode materials. The surface of lithium ion battery electrode materials always has residual - OH, acetylacetonate metal salt molecules (acetylacetone M, where M is zirconium, iron, aluminum, molybdenum, zinc or manganese) are first adsorbed to the surface of the material through the chemical bond M-O bond in absolute ethanol, and then water is added to make the original adsorption The acetylacetone M of the acetylacetone is removed by hydrolysis to achieve the result of interface monolayer modification

Method used

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  • A method for surface modification of electrode materials

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Effect test

Embodiment 1

[0019] Select the modified molecule aluminum acetylacetonate and mix it with NCM811 electrode material, where the mass fraction of aluminum acetylacetonate in the mixture is 1.5%, add a small amount of ethanol, condense and reflux at 70 degrees for 6 hours, add a small amount of water, and continue to reflux After 2 hours, suction filtration and drying at 80°C, the NCM811 electrode material modified with aluminum acetylacetonate was obtained.

Embodiment 2

[0021] Select the modified molecule aluminum acetylacetonate and mix it with NCM811 electrode material, wherein the mass fraction of aluminum acetylacetonate in the mixture is 0.5%, add a small amount of ethanol, condense and reflux at 70 degrees for 6 hours, add a small amount of water, and continue to reflux After 2 hours, suction filtration and drying at 80°C, the NCM811 electrode material modified with aluminum acetylacetonate was obtained.

Embodiment 3

[0023] Select the modified molecule iron acetylacetonate and mix it with NCM811 electrode material, wherein the mass fraction of aluminum acetylacetonate in the mixture is 0.05%, add a small amount of ethanol, condense and reflux at 100 degrees for 4 hours, add a small amount of water, and continue to reflux After 1 hour, suction filtration, and drying at 60°C, the NCM811 electrode material modified with iron acetylacetonate was obtained.

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Abstract

The invention belongs to the technical field of lithium ion batteries, and in particular relates to a method for modifying the surface of an electrode material. The specific scheme is as follows: after mixing the acetylacetone metal salt and the electrode material, adding the ethanol solution to reflux, then adding water to continue reflux, filtering and drying to obtain the surface-modified electrode material. The invention forms a thin and uniform monomolecular wrapping layer on the surface of the electrode material, which is relatively stable and not easy to fall off, and can improve the cycle stability performance of the electrode material. The method is simple, the cost is low, and it is beneficial to large-scale production.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a method for modifying the surface of electrode materials of lithium ion batteries. Background technique [0002] The organic electrolyte is an important part of the lithium-ion battery. It is responsible for the transmission of charges between the positive and negative electrodes in the battery. The electrolyte is generally composed of two parts: electrolyte lithium salt and organic solvent. The electrolyte lithium salt used in commercial lithium-ion batteries is generally lithium hexafluorophosphate, and the organic solvent is generally a mixed solvent composed of two or more organic solvents, mainly EC (ethylene carbonate), PC (propylene carbonate), DMC (carbonic acid Dimethyl ester), DEC (diethyl carbonate), EMC (ethyl methyl carbonate) and other chain and cyclic carbonates. The formula composition, water content, hydrofluoric acid, and metal impuri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525H01M10/42
CPCY02E60/10
Inventor 庄严张韦关明云刘维桥周全法
Owner JIANGSU UNIV OF TECH
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