Preparation method of modified expanded micro-powder graphite negative electrode material for lithium ion battery

A lithium-ion battery, micro-powder graphite technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as poor charge and discharge performance, and achieve the effects of low cost, wide source, good specific capacity and cyclability

Inactive Publication Date: 2020-04-17
凯盛石墨碳材料有限公司
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to improve the problem of poor charge and discharge performance of existing natural graphite negati

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0021] (1) Preparation of expanded micropowder graphite:

[0022] take D 50 10g of high-purity micropowder graphite of 8μm, 35mL of perchloric acid, 5mL of concentrated nitric acid of 66-68wt% as an intercalation agent, 5g of potassium permanganate as an oxidant, mixed evenly and reacted at room temperature (25°C) for 1.5h, the reaction After finishing, wash with water until neutral, and dry at 60°C for 5 hours to obtain expanded graphite (expansion volume is 26mL / g, specific surface area is about 16m 2 / g).

[0023] (2) Preparation of modified expanded micro-powder graphite anode materials for lithium-ion batteries:

[0024] S1. Put 10 g of the expanded graphite powder obtained above into a planetary ball mill, add 20 mL of absolute ethanol as a dispersant during the ball milling process (to promote the dispersion of materials and reduce agglomeration), and disperse by ball milling to obtain material 1;

[0025] S2. Mix material 1 with 15 g of phenolic resin solution (etha...

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PUM

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Abstract

The invention relates to a preparation method of a modified expanded micro-powder graphite negative electrode material for a lithium ion battery. The preparation method is characterized by comprisingthe following steps: S1, carrying out ball-milling dispersion on expanded micro-powder graphite to obtain a material 1, and adding absolute ethyl alcohol which accounts for 5-10% of the weight of theexpanded micro-powder graphite as a dispersing agent; S2, uniformly mixing the material 1 with a coating agent in a mass ratio of 1: (0.1-0.15), and performing spray drying to obtain a material 2; S3,carbonizing the material 2 at high temperature, introducing protective gas, and carbonizing at 900-1200 DEG C for 1-2 h to obtain a material 3; S4, mixing and granulating the cooled material 3 and asphalt, wherein the mass ratio of the material 3 to the asphalt is (20-16): (1-4), and performing stirring reaction for 1-3 h at the temperature of 300-650 DEG C to obtain a material 4; S5, performingmechanical ball milling treatment on the material 4 to obtain a material 5 of 8-15 [mu] m; and S6, performing high-temperature graphitization treatment on the material 5 at 2400-3000 DEG C for 1-2 h.The preparation method has the advantages of wide raw material source, low cost, simple process and easiness in industrial production.

Description

technical field [0001] The invention relates to the field of negative electrode materials for lithium batteries, in particular to a preparation method for modified expanded micropowder graphite negative electrode materials for lithium ion batteries. Background technique [0002] As a green secondary battery with superior performance, lithium-ion battery has become one of the focuses of high-tech development. In order to continuously meet the high-performance demand for lithium-ion batteries in the new energy market, in the future, lithium-ion batteries will develop in the direction of low cost, high energy density, high power density, long life, and miniaturization. Natural graphite has high crystallinity, good electrical conductivity, and a perfect layered structure, which is conducive to the intercalation / extraction reaction of lithium ions, and the lithium intercalation potential is low, and the energy density is high. Its theoretical specific capacity is 372mAh / g, and th...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/583H01M4/62H01M10/0525
CPCH01M4/366H01M4/583H01M4/62H01M4/628H01M10/0525Y02E60/10
Inventor 彭寿任东风文贵强李飏陈涛李新雨王文齐刘海东李玉峰彭旭升李印龙
Owner 凯盛石墨碳材料有限公司
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