Preparation method of anode material of lithium ion power battery

A negative electrode material, power battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of reducing the first irreversible capacity of natural microcrystalline graphite, affecting the first charge and discharge performance of the material, and unfavorable battery manufacturing process, to avoid Irreversible loss, increased surface property uniformity, effect of surface property uniformity

Inactive Publication Date: 2016-12-21
HEYE HEALTH TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The key to this method is to form a complete coating on the outside of the graphite, otherwise it will not be able to prevent the contact between the electrolyte and the graphite. Generally, a layer of resin carbon is coated on the surface of the natural microcrystalline graphite particles to form a core-shell structure. The inside is natural microcrystalline graphite, and the outside is a 1-2 μm phenolic resin pyrolytic carbon layer. Coating treatment can reduce the first irreversible capacity of natural microcrystalline graphite, but only coating the resin hard carbon precursor will make it incompatible with graphite materials. In addition, due to the low degree of graphitiza

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  • Preparation method of anode material of lithium ion power battery

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Embodiment 1

[0040] The preparation method of lithium-ion power battery negative electrode material is characterized in that it comprises the following steps in sequence:

[0041](1) Mix the thermosetting resin and the organic solvent at room temperature at a mass ratio of 1:1. After mixing, add the graphite raw material and stir for 2 hours, then add the curing agent H ３ PO ４ And continue to stir until uniformly mixed, then heat the solution to remove the organic solvent contained therein, and then perform curing treatment at a curing temperature of 78-85°C to obtain a cured thermosetting resin mixture;

[0042] The mass ratio of graphite raw material to thermosetting resin is 1: 0.01; the thermosetting resin is phenolic resin;

[0043] The organic solvent includes a first organic solvent and a second organic solvent composed of a mass ratio of 8:1;

[0044] The first organic solvent is propylene carbonate and triethyl phosphate; the volume ratio of propylene carbonate and triethyl phos...

Embodiment 2

[0061] The preparation method of lithium-ion power battery negative electrode material is characterized in that it comprises the following steps in sequence:

[0062] (1) Mix the thermosetting resin and organic solvent at room temperature at a mass ratio of 1:10, add graphite raw materials after mixing and stir for 4 hours, then add curing agent H ３ PO ４ And continue to stir until uniformly mixed, then heat the solution to remove the organic solvent contained therein, and then perform curing treatment at a curing temperature of 78-85°C to obtain a cured thermosetting resin mixture;

[0063] The mass ratio of graphite raw material to thermosetting resin is 1:0.5; the thermosetting resin is at least one of phenolic resin, epoxy resin and furan resin;

[0064] The organic solvent includes a first organic solvent and a second organic solvent composed of a mass ratio of 10:1;

[0065] The first organic solvent is propylene carbonate and triethyl phosphate; the volume ratio of pro...

Embodiment 3

[0082] The preparation method of lithium-ion power battery negative electrode material is characterized in that it comprises the following steps in sequence:

[0083] (1) Mix the thermosetting resin and organic solvent at room temperature at a mass ratio of 1:7, add graphite raw materials after mixing and stir for 3 hours, then add curing agent H ３ PO ４ And continue to stir until uniformly mixed, then heat the solution to remove the organic solvent contained therein, and then perform curing treatment at a curing temperature of 78-85°C to obtain a cured thermosetting resin mixture;

[0084] The mass ratio of graphite raw material to thermosetting resin is 1: 2; the thermosetting resin is at least one of phenolic resin, epoxy resin and furan resin;

[0085] The organic solvent includes a first organic solvent and a second organic solvent composed of a mass ratio of 9:1;

[0086] The first organic solvent is propylene carbonate and triethyl phosphate; the volume ratio of propyl...

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Abstract

The invention relates to an anode material of a battery, mainly relates to a preparation method of an anode material of a lithium ion power battery and belongs to the field of lithium ion power battery manufacturing. The preparation method sequentially comprises the following steps: (1) mixing thermosetting resin and an organic solvent, then adding graphite raw material, subsequently adding a curing agent, then removing the organic solvent contained in the mixture, and curing; (2) dispersing the thermosetting resin-doped mixture in a dispersing agent for 1-2 hours in a way of mixing and ball milling, and then drying; (3) adding a compound modifier into the dried and cured mixture, and heating to obtain a mixture subjected to compound modification; and (4) vapor depositing a silicon-carbon organic matter precursor on the mixture subjected to compound modification at the temperature of 500-1500 DEG C under the pressure of 1-2MPa, thus obtaining a carbon anode material with the surface coated with carbon and silicon, namely the anode material of the lithium ion power battery, which has the advantage of the improved electrical performance.

Description

technical field [0001] The invention relates to a battery negative electrode material, mainly relates to a preparation method of a lithium ion power battery negative electrode material, and belongs to the field of lithium battery production. Background technique [0002] Lithium-ion batteries have the advantages of high working voltage, large specific energy, and good safety performance, and are widely used in mobile communications, notebook computers and other fields. Especially with the wide application of electric vehicles in the future, higher requirements are put forward for lithium-ion batteries. . Natural graphite materials as negative electrode materials have the advantages of abundant reserves, high specific capacity, low voltage platform, and very strong cost performance, but there are serious defects in direct use, such as low initial discharge efficiency, poor cycle performance, and electrolysis. The shortcomings of high liquid selectivity limit the application ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/587H01M4/62H01M10/0525
CPCH01M4/366H01M4/386H01M4/587H01M4/628H01M10/0525Y02E60/10
Inventor 方志财胡立江李俊潘丹
Owner HEYE HEALTH TECH CO LTD
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