Composite graphite negative electrode material, preparation method and application thereof, and lithium ion battery

A technology for lithium ion batteries and negative electrode materials, which is applied in the directions of graphite, battery electrodes, secondary batteries, etc., can solve the problems of low rate charge and discharge performance, high production cost, low lithium intercalation capacity, etc. The effect of sheet rebound and yield improvement

Active Publication Date: 2021-04-16
NINGBO SHANSHAN NEW MATERIAL TECH
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  • 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 problems of low lithium intercalation ability, low rate charge and discharge performance, high production cost and difficulty in mass production of graphite negative electrode materials in the prior art, and provide a composite graphite negative electrode material and its preparation method and applications, lithium-ion batteries

Method used

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  • Composite graphite negative electrode material, preparation method and application thereof, and lithium ion battery
  • Composite graphite negative electrode material, preparation method and application thereof, and lithium ion battery
  • Composite graphite negative electrode material, preparation method and application thereof, and lithium ion battery

Examples

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Embodiment 1

[0074] The preparation method of the composite graphite negative electrode material of the present embodiment, concrete steps are as follows:

[0075] The kiln powder of the needle coke is pulverized by a roller mill. The median particle size D50 of the pulverized material is 9.5 μm, and the fine powder is removed by shaping. At this time, the median particle size D50 of the shaped material is 10.0 μm. The shaped material was graphitized in an Acheson graphitization furnace, the graphitization temperature was 3000°C, and the temperature was kept constant for 32 hours. The graphitized material and petroleum asphalt were mixed in a CDLW-6000 ribbon mixer with a mass ratio of 100:4 for 60 minutes. The frequency of the CDLW-6000 ribbon mixer was 30 Hz, and the petroleum asphalt The median particle size D50 is 3 μm, the softening point is 220°C, and the volatile content is 35%. The above-mentioned mixture is coated with asphalt in a horizontal coating kettle. The horizontal coatin...

Embodiment 2

[0079] The difference between this example and Example 1 lies in that the first particle and the second particle are blended at a mass ratio of 50:50, and other conditions are kept the same as in Example 1.

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Abstract

The invention discloses a composite graphite negative electrode material, a preparation method and application thereof, and a lithium ion battery. The method comprises the following steps: (1) carrying out graphitization treatment, asphalt coating treatment and carbonization treatment on needle coke kiln front powder to obtain first particles; (2) performing asphalt coating treatment, crushing de-polymerization treatment and graphitization treatment on petroleum coke to obtain second particles; and (3) blending the first particles and the second particles; wherein the mass ratio of the first particles to the second particles is 1: (1-4); and the step (1) and the step (2) are not performed in sequence. The composite graphite negative electrode material prepared by the invention comprises two particle structures, has the characteristics of high-rate quick charge-discharge capacity and high tap density of the first particle structure, also has the characteristic of high capacity of the second particle structure, and can be applied to a power lithium battery of a passenger vehicle. Furthermore, the adopted needle coke kiln front powder and coal pitch are low in price, so that the production cost is saved.

Description

technical field [0001] The invention relates to a composite graphite negative electrode material, a preparation method and application thereof, and a lithium ion battery. Background technique [0002] Lithium-ion batteries have many advantages such as high energy density, long cycle life, small self-discharge, no memory effect and environmental friendliness, and have been widely used in the field of consumer electronics. At the same time, lithium-ion batteries are being gradually promoted in the fields of pure electric, hybrid electric and extended-range electric passenger vehicles, making them the batteries with the largest market share growth among many batteries. However, the continuous development of the field of electric vehicles has also put forward higher requirements for the cruising range, rate charge and discharge capacity, and life of lithium-ion batteries. Lithium-ion batteries are mainly composed of positive electrodes, negative electrodes, electrolytes, and se...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/20C01B32/205H01M4/36H01M4/583H01M4/62H01M10/0525
CPCY02E60/10
Inventor 吴政操吴仙斌苗荣荣吴志红
Owner NINGBO SHANSHAN NEW MATERIAL TECH
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