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Negative electrode material with porous carbon coating layer, preparation method of negative electrode material and lithium ion battery

A negative electrode material, porous carbon technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as poor electrolyte compatibility and exfoliation of graphite layers, and achieve improved electrochemical performance, improved dispersibility, and low cost. Effect

Pending Publication Date: 2022-05-20
HUNAN SHINZOOM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Graphite, as one of the most widely used anode materials for lithium-ion batteries in the market, has the advantages of high capacity, low price, and low voltage platform, but it also has poor compatibility with the electrolyte, and the graphite layer will peel off during the charge-discharge cycle. and other shortcomings, graphite needs to be modified to improve its electrochemical performance

Method used

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  • Negative electrode material with porous carbon coating layer, preparation method of negative electrode material and lithium ion battery
  • Negative electrode material with porous carbon coating layer, preparation method of negative electrode material and lithium ion battery

Examples

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Embodiment 1

[0052] A preparation method of a negative electrode material with a porous carbon coating layer, comprising the following steps:

[0053] (1) phenolic resin is dispersed in the mixed solvent of cyclohexanol and dehydrated alcohol to obtain phenolic resin solution for subsequent use (for subsequent step (2) and step (3)), the quality of the cyclohexanol and dehydrated alcohol The ratio is 0.8:1, and the mass ratio of the phenolic resin and the organic solvent is 1:100;

[0054] (2) adopt the mixing of formaldehyde and ammonia water to carry out reductive emulsification to phenolic resin solution, the NH of described phenolic resin, formaldehyde and ammonia water 3 The mass ratio of phenolic resin is 1:0.5:0.2, then freeze-drying at -60°C, heating to 700°C for pre-carbonization at 1°C / min, and cooling to room temperature to obtain modified phenolic resin;

[0055] (3) mixing the modified phenolic resin and potassium hydroxide in a mass ratio of 3:1, and performing an activation...

Embodiment 2

[0060] A preparation method of a negative electrode material with a porous carbon coating layer, comprising the following steps:

[0061] (1) phenolic resin is dispersed in the mixed solvent of cyclohexanol and dehydrated alcohol to obtain phenolic resin solution for subsequent use (for subsequent step (2) and step (3)), the quality of the cyclohexanol and dehydrated alcohol The ratio is 0.7:1, and the mass ratio of the phenolic resin and the organic solvent is 2.5:100;

[0062] (2) adopt the mixing of formaldehyde and ammonia water to carry out reductive emulsification to phenolic resin solution, the NH of described phenolic resin, formaldehyde and ammonia water 3 The mass ratio of phenolic resin is 1:0.4:0.3, then freeze-dried at -75°C, heated to 750°C for pre-carbonization at 3°C / min, and cooled to room temperature to obtain modified phenolic resin;

[0063] (3) mixing the modified phenolic resin and potassium hydroxide according to a mass ratio of 4:1, and performing an a...

Embodiment 3

[0068] A preparation method of a negative electrode material with a porous carbon coating layer, comprising the following steps:

[0069] (1) phenolic resin is dispersed in the mixed solvent of cyclohexanol and dehydrated alcohol to obtain phenolic resin solution for subsequent use (for subsequent step (2) and step (3)), the quality of the cyclohexanol and dehydrated alcohol The ratio is 0.6:1, and the mass ratio of the phenolic resin and the organic solvent is 2:100;

[0070] (2) adopt the mixing of formaldehyde and ammonia water to carry out reductive emulsification to phenolic resin solution, the NH of described phenolic resin, formaldehyde and ammonia water 3 The mass ratio of phenolic resin is 1:0.5:0.25, and then freeze-dried at -70°C, heated to 750°C for pre-carbonization at 2°C / min, and cooled to room temperature to obtain modified phenolic resin;

[0071] (3) mixing the modified phenolic resin and potassium hydroxide in a mass ratio of 2.5:1, and performing an activa...

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Abstract

The invention discloses a negative electrode material with a porous carbon coating layer, a preparation method of the negative electrode material and a lithium ion battery. The method comprises the following steps: 1) dispersing phenolic resin into an organic solvent to obtain a phenolic resin solution; 2) carrying out reduction emulsification by adopting a phenolic resin solution, and then freeze-drying to obtain modified phenolic resin; 3) performing pore-forming treatment on the modified phenolic resin to obtain porous carbon; and 4) dispersing the porous carbon and the carbon-containing negative electrode material in a phenolic resin solution for liquid-phase coating, drying and heat treatment to obtain the negative electrode material with the porous carbon coating layer. According to the method disclosed by the invention, the carbon-containing negative electrode material is coated by adopting the porous carbon with a specific structure and the phenolic resin solution together, and the mixed coating layer is obtained after heat treatment; the carbon-containing negative electrode material is coated and modified by the mixed coating layer, so that the electrochemical performance of the negative electrode material is greatly improved.

Description

technical field [0001] The invention relates to the technical field of new energy, in particular to a negative electrode material with a porous carbon coating layer, a preparation method thereof and a lithium ion battery. Background technique [0002] As one of the most widely used anode materials for lithium-ion batteries in the current market, graphite has the advantages of high capacity, low price, and low voltage platform. and other shortcomings, graphite needs to be modified to improve its electrochemical performance. Common methods in the prior art include oxidation, coating, doping with other elements, reduction modification and other methods to modify graphite. For example, CN108598478A discloses a method for preparing modified graphite and modified graphite. The method for preparing modified graphite includes: The natural spherical graphite, the coated carbon source and the organic solvent are mixed to obtain a first mixed slurry. The first mixed slurry is put int...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/62H01M10/0525
CPCH01M4/366H01M4/62H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 陈文强
Owner HUNAN SHINZOOM TECH
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