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Preparation method of asphalt hard carbon material for lithium ion battery cathode

A lithium-ion battery and hard carbon technology, applied in battery electrodes, carbon preparation/purification, circuits, etc., can solve problems such as unfavorable large-scale production, cumbersome process technology, and poor safety performance, and achieve excellent cycle performance and high reversibility The effect of low capacity and production cost

Active Publication Date: 2013-04-03
成都佰思格科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the preparation methods of the above-mentioned patents and literature reports, some need to add a crosslinking agent, and involve material mixing and pre-carbonization process, the process technology is cumbersome; High, poor safety performance; some need to add a catalyst, the product needs to be washed and dried, etc., the cost is high
In addition, lithium-ion battery anode materials prepared from biomass materials are not conducive to large-scale production due to the limitations of raw material sources and cost.

Method used

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  • Preparation method of asphalt hard carbon material for lithium ion battery cathode
  • Preparation method of asphalt hard carbon material for lithium ion battery cathode
  • Preparation method of asphalt hard carbon material for lithium ion battery cathode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 1. Add 15g of coal pitch with a softening point of 273°C into the pulverizer, pulverize it at a speed of 10,000 r / min for 10 minutes, and pulverize it to a particle size below 30 μm, take 1.5g of the sieved pitch powder and put it into a tube furnace air was introduced at a gas speed of 0.5L / min, heated to 330°C at a heating rate of 0.5°C / min, and cured for 2 hours to obtain 1.3g of cured powder. The thermally cured asphalt powder was placed in a tubular carbonization furnace. , nitrogen gas was introduced at a gas rate of 0.2L / min, the temperature was raised to 700°C for 2 hours at a heating rate of 2°C / min, and 0.98 g of pitch hard carbon material was obtained after cooling to room temperature. The diameter is 5-10 μm, and XRD test shows that the pitch hard carbon material layer spacing d 002 is 0.380 nm.

[0019] 2. Take 0.22g of the pitch hard carbon material obtained in step 1, mix it with 0.0125g of conductive carbon black and 0.0175g of polyvinylidene fluoride...

Embodiment 2

[0021] 1. This example is the same as Step 1 of Example 1, except that the carbonization temperature in Example 1 was changed from 700°C to 800°C, and the pitch hard carbon material was prepared according to the method described in Step 1 of Example 1.

[0022] 2. Take 0.22g of the pitch hard carbon material obtained in step 1, mix it with 0.0125g of conductive carbon black and 0.0175g of polyvinylidene fluoride, add 0.3g of nitrogen methyl pyrrolidone dropwise, mix well to make a slurry, and place the current collector on the copper foil. A coating film was applied, and the coated pole piece was placed in a vacuum drying oven with a temperature of 120° C. for 12 hours to dry, and then a negative electrode piece was prepared after punching. Then use lithium metal sheet as the counter electrode, 1 mol / L LiPF 6 The EC / DEC mixed solution is the electrolyte (the volume ratio of EC / DEC is 1:1), and the Celgard2400 polypropylene film is the separator, and a button-type simulated ba...

Embodiment 3

[0024] 1. This example is the same as Step 1 of Example 1, except that the carbonization temperature in Example 1 was changed from 700°C to 1000°C, and the pitch hard carbon material was prepared according to the method described in Step 1 of Example 1.

[0025] 2. Take 0.22g of the pitch hard carbon material obtained in step 1, mix it with 0.0125g of conductive carbon black and 0.0175g of polyvinylidene fluoride, add 0.3g of nitrogen methyl pyrrolidone dropwise, mix well to make a slurry, and place the current collector on the copper foil. A coating film was applied, and the coated pole piece was placed in a vacuum drying oven with a temperature of 120° C. for 12 hours to dry, and then a negative electrode piece was prepared after punching. Then use metal lithium sheet as the counter electrode, 1mol / L LiPF 6 The EC / DEC mixed solution is the electrolyte (the volume ratio of EC / DEC is 1:1), and the Celgard2400 polypropylene film is the separator, and a button-type simulated ba...

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Abstract

The invention discloses a preparation method of an asphalt hard carbon material for a lithium ion battery cathode. The method includes the steps of: taking asphalt with a softening point of 200-280DEG C as the raw material, crushing it and adding it into a tube furnace, in an air atmosphere, raising the temperature to 250-350DEG C, carrying out curing, adding the cured asphalt powder into a carbonization furnace, and in a nitrogen atmosphere, raising the temperature to 700-1300DEGC to perform a carbonization treatment, thus obtaining the asphalt hard carbon material. The method provided in the invention has the advantages that it is simple and practical, green and environment-friendly, and is easy for large-scale industrial production. And the prepared asphalt hard carbon material as a lithium ion battery cathode material has high reversible capacity, good large current performance and excellent cycle performance.

Description

technical field [0001] The invention relates to a preparation method of pitch hard carbon material for negative electrode of lithium ion battery, and belongs to the technology of negative electrode material of lithium ion battery. Background technique [0002] With the rapid development of portable electronic devices, lithium-ion secondary batteries have become more and more widely used. Lithium-ion secondary batteries have been gradually applied in the fields of hybrid electric vehicles (HEV) and pure electric vehicles (EV) in recent years due to their light weight and high energy density. [0003] The shortcomings of traditional commercial lithium-ion battery anode graphite materials, such as capacity density and power characteristics, limit their application in the field of electric vehicles. The hard carbon materials have smaller graphite-like crystallite size, larger interlayer spacing, and more reasonable pore structure. Therefore, compared with graphite, hard carbo...

Claims

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Application Information

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IPC IPC(8): C01B31/02H01M4/38C01B32/05
CPCY02E60/12Y02E60/10
Inventor 王成扬郭志华陈明鸣
Owner 成都佰思格科技有限公司
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