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Coated modified artificial graphite negative electrode material, preparation method thereof and lithium ion battery

An artificial graphite negative electrode and artificial graphite technology, applied in the direction of negative electrodes, secondary batteries, battery electrodes, etc., can solve the problems of poor battery power performance, uneven mixing, poor mixing coating effect, etc., and achieve battery power performance improvement, cycle excellent effect

Active Publication Date: 2021-06-25
NINGBO SHANSHAN NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the defects of poor mixing and coating effect in the prior art, uneven mixing, incompatibility of prepared electrode material capacity and rate performance, and poor power performance of the battery, and provides a coating Modified artificial graphite negative electrode material and preparation method thereof, lithium ion battery

Method used

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  • Coated modified artificial graphite negative electrode material, preparation method thereof and lithium ion battery
  • Coated modified artificial graphite negative electrode material, preparation method thereof and lithium ion battery
  • Coated modified artificial graphite negative electrode material, preparation method thereof and lithium ion battery

Examples

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Embodiment 1

[0066] The preparation method of the coated modified artificial graphite negative electrode material of the present embodiment, the specific steps are as follows:

[0067] ① Preparation of secondary particles of artificial graphite

[0068] (1) The ordinary petroleum coke raw material is pulverized by mechanical milling, and fine powder is removed by classification, and the median particle diameter D50 of the pulverized material obtained is 10.8 μm;

[0069] (2) Fully mix the pulverized material and asphalt in a CDLW-8000 ribbon mixer with a mass ratio of 100:8, and the mixing time is 50 minutes;

[0070] (3) The mixture is heat-treated in a horizontal reactor under the protection of a nitrogen atmosphere at a temperature of 700°C for 8 hours;

[0071] (4) Carry out graphitization treatment under the condition of 3000 DEG C, graphitization time is 30h, obtains the secondary particle of the artificial graphite that median diameter D50 is 15.5 μ m;

[0072] ②Secondary particle...

Embodiment 2

[0080] The difference between this example and Example 1 is that the graphene in the coal tar residue and the graphene slurry in step (5) is fully dispersed with a mass ratio of 6:0.02 to obtain a coated modified artificial graphite negative electrode material The median particle size D50 is 16.3μm, the particle size distribution range is 2.6-37.7μm, and the tap density is 1.15g / cm 3 , the specific surface area is 1.12m 2 / g, the discharge capacity is 356.6mAh / g, and the first efficiency is 93.3%.

Embodiment 3

[0082] The difference between this example and Example 1 is that the graphene in the coal tar residue and the graphene slurry in step (5) is fully dispersed with a mass ratio of 6:0.08 to obtain a coated modified artificial graphite negative electrode material The median particle size D50 is 16.7μm, the particle size distribution range is 3.4-38.4μm, and the tap density is 1.14g / cm 3 , the specific surface area is 1.16m 2 / g, the discharge capacity is 356.8mAh / g, and the first efficiency is 93.1%.

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Abstract

The invention discloses a coated modified artificial graphite negative electrode material, a preparation method thereof and a lithium ion battery, and the method comprises the following steps: sequentially carrying out wet coating and carbonization treatment on secondary particles of artificial graphite. The raw materials of the secondary particles of the artificial graphite comprise petroleum coke and / or coal coke and asphalt. The softening point of the asphalt is 130-160 DEG C. A coating agent adopted in the wet coating process comprises coal tar residual oil and graphene slurry. The mass ratio of the coal tar residual oil to the graphene in the graphene slurry is 6: 0.005-6: 0.64. The coated modified artificial graphite negative electrode material is obtained by the method. The coated modified artificial graphite negative electrode material prepared by the preparation method disclosed by the invention takes charge-discharge rate and high-capacity first efficiency into account, and has excellent performance in the aspects of discharge capacity, first efficiency, high-rate charge-discharge, circulation and the like.

Description

technical field [0001] The invention belongs to the technical field of lithium battery negative electrode material preparation, and in particular relates to a coated modified artificial graphite negative electrode material, a preparation method thereof, and a lithium ion battery. Background technique [0002] Commercially available artificial graphite anode materials have many advantages such as high discharge capacity, low charge and discharge voltage platform, small self-discharge, and no memory effect, and have been widely used in mobile phones, laptop computers, and power tools. However, as the requirements for small, convenient and short-time charging of various products continue to increase, the requirements for fast charging performance of lithium-ion batteries are also increasing. At present, in order to obtain better rate performance, the application process of negative electrode materials often needs to be regulated and optimized by reducing particle size, carbon s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/205H01M4/36H01M4/587H01M4/62H01M10/0525
CPCC01B32/205H01M4/366H01M4/587H01M4/625H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 陈跃苗荣荣吴仙斌
Owner NINGBO SHANSHAN NEW MATERIAL TECH
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