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Artificial graphite composite negative electrode material for lithium ion battery and preparation method for negative electrode material

A lithium-ion battery, artificial graphite technology, applied in battery electrodes, electrode manufacturing, electrode heat treatment and other directions, can solve the problems of complex preparation process, high price of mesocarbon microspheres, etc., achieve simple process, not easy to loosen and disintegrate, small The effect of specific surface area

Active Publication Date: 2017-11-21
GUANGDONG DONGDAO NEW ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN102110813A discloses a lithium-ion battery negative electrode graphite material, which includes mesophase graphite and artificial graphite. This invention improves the compaction density of the graphite material to a certain extent, but the first capacity of the graphite negative electrode material produced by this method can only reach 350mAh / g, and mesocarbon microspheres are expensive; CN105938906A discloses an artificial graphite composite negative electrode material for lithium-ion batteries and a preparation method thereof. Cycle rebound artificial graphite composite anode material, the first capacity is higher than 355mAh / g, and the first efficiency is about 94%
However, in the preparation process, it is necessary to bombard the needle coke with an ion beam under a high-temperature inert atmosphere to obtain a composite precursor with micropores or irregular micro-pits on the surface, and the preparation process is complicated.

Method used

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  • Artificial graphite composite negative electrode material for lithium ion battery and preparation method for negative electrode material
  • Artificial graphite composite negative electrode material for lithium ion battery and preparation method for negative electrode material

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Embodiment 1

[0024] A kind of preparation method of artificial graphite composite negative electrode material for lithium ion battery proposed by the present invention comprises the following steps:

[0025] a. Crushing and grading petroleum-based needle coke in an impact mill to obtain powders with an average particle size D50 of 14-18 μm and an average particle size D50 of 3-6 μm;

[0026] b. Uniformly mix the powders with the average particle size D50 obtained in step a of 14-18 μm and the average particle size D50 of 3-6 μm according to a mass ratio of 100:10 to obtain a composite precursor;

[0027] c. Spheroidizing the composite precursor obtained in step b;

[0028] d. Graphitizing the material obtained in step c for 6 hours at a high temperature of 2600° C.;

[0029] E, the material that step d obtains is uniformly mixed with asphalt according to mass ratio 100:2;

[0030] f, put the material obtained in step e in N 2 Under protection, treat at 1200°C for 4 hours, cool to room t...

Embodiment 2

[0032] A kind of preparation method of artificial graphite composite negative electrode material for lithium ion battery proposed by the present invention comprises the following steps:

[0033] a. The calcined coke of the coal-based needle coke is pulverized and classified in an impact mill to obtain powders with an average particle size D50 of 16-20 μm and an average particle size D50 of 3-5 μm;

[0034] b. Uniformly mix powders of two particle sizes obtained in step a with an average particle size D50 of 16-20 μm and an average particle size D50 of 3-5 μm according to a mass ratio of 100:5 to obtain a composite precursor;

[0035] c. Spheroidizing the composite precursor obtained in step b;

[0036] d. Graphitizing the material obtained in step c for 10 h at a high temperature of 2800° C.;

[0037] E, the material obtained in step d is uniformly mixed with epoxy resin according to the mass ratio of 100:1;

[0038] f, put the material obtained in step e in N 2 Under prote...

Embodiment 3

[0040] A kind of preparation method of artificial graphite composite negative electrode material for lithium ion battery proposed by the present invention comprises the following steps:

[0041] a. Carry out pulverization and classification of petroleum-based calcined coke in an impact mill to obtain powders with an average particle diameter D50 of 18-22 μm and an average particle diameter D50 of 5-8 μm;

[0042] b. The average particle size D50 obtained in step a is 18-22 μm and the average particle size D50 is 5-8 μm, and the powders with two particle sizes are uniformly mixed according to the mass ratio of 100:8 to obtain a composite precursor;

[0043] c. Spheroidizing the composite precursor obtained in step b;

[0044] d. Graphitizing the material obtained in step c for 10 h at a high temperature of 2800° C.;

[0045] E, the material obtained in step d is uniformly mixed with glucose according to the mass ratio of 100:5;

[0046] f, put the material obtained in step e ...

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Abstract

The invention discloses an artificial graphite composite negative electrode material for a lithium ion battery. The negative electrode material is 16-21[mu]m in average grain diameter D50, 1.1-1.2g / cm<3> in tap density, 1.0-3.0m<2> / g in surface specific area, and less than 0.05% in ash content; the preparation method comprises the steps of performing smashing and grading on needle coke to obtain powder of two kinds of granularities; performing uniform mixing on the powder of two kinds of granularities to obtain a composite precursor; performing balling and shaping treatment on the composite precursor; performing high-temperature graphitization treatment on the shaped material; performing uniform mixing on the graphitized material and an organic carbon source; and performing carbonization on the mixture and cooling to the room temperature. The obtained negative electrode material can be 1.75g / cm<3> in compaction density; the initial reversible capacity can be higher than 355mAh / g; the initial discharge efficiency can be as high as 97%; the cycling performance at middle rate (0.5C, 1C, 2C) can be greatly improved; and in addition, the preparation method is simple and low in cost and suitable for industrial production.

Description

technical field [0001] The invention relates to the technical field of carbon negative electrode materials for lithium ion batteries, in particular to an artificial graphite composite negative electrode material for lithium ion batteries and a preparation method thereof. Background technique [0002] Lithium-ion batteries have a series of advantages such as high specific capacity, high working voltage, good safety, and no memory effect, and are widely used in many portable electronic devices such as notebook computers, mobile phones, and instrument lamps. With the popularization of new energy vehicles, its application scope has been extended to fields such as electric vehicles. As one of the core components of the battery, the negative electrode material plays a key role in the overall performance of the battery. Among the existing negative electrode materials, artificial graphite has the advantages of good compatibility with the electrolyte, good cycle and rate performance...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/583H01M4/04
CPCH01M4/04H01M4/0471H01M4/362H01M4/583Y02E60/10
Inventor 赵娟杨耐德余江李波
Owner GUANGDONG DONGDAO NEW ENERGY
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