Method for preparing high-capacity hard carbon negative electrode material of lithium ion battery

A technology for lithium-ion batteries and negative electrode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as high cost, difficult industrialization, and complicated processes, and achieve stable product properties, mild and controllable conditions, and simple preparation processes Effect

Inactive Publication Date: 2019-06-21
NINGBO SHANSHAN NEW MATERIAL TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the defects of complex process, high cost, and difficulty in industrialization in the prior art, and provide a har

Method used

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  • Method for preparing high-capacity hard carbon negative electrode material of lithium ion battery

Examples

Experimental program
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Example Embodiment

[0027] Example 1

[0028] 1. The high-temperature petroleum asphalt with a softening point of 280℃ is pulverized by a jet mill classifier to produce a powder with a volume average particle size D50 of 9μm; in this example, jet milling is preferred, and the compressed air pressure for jet milling is 8~ 9Mpa, feeding frequency is 15~25Hz;

[0029] 2. Charge 1000g of the obtained asphalt powder together with 100g of ammonium persulfate into a mixing mixer and mix at 500r / min for 5 minutes and then discharge to obtain a mixture;

[0030] 3. Place the resulting mixture in a blast drying oven at 80°C for 2 hours and then heat up to 150°C to continue the reaction for 2 hours. After cooling to room temperature, the mixture is discharged to obtain oxidized asphalt powder;

[0031] 4. Put it into a pit furnace and heat up to 600°C for 1 hour at 2°C / min under the protection of nitrogen, and then cool down to room temperature to discharge;

[0032] 5. Put it into an atmosphere furnace and heat it ...

Example Embodiment

[0034] Example 2

[0035] 1. The high-temperature petroleum asphalt with a softening point of 280℃ is crushed by a jet mill classifier to produce a powder with a volume average particle size D50 of 9μm;

[0036] 2. Feed 1000g of the obtained asphalt powder together with 200g of ammonium persulfate into a mixing mixer and mix at a speed of 500r / min for 5 minutes and then discharge to obtain a mixture;

[0037] 3. Place the resulting mixture in a blast drying oven at 100°C for 2 hours, then increase the temperature to 200°C and continue the reaction for 2 hours. After cooling to room temperature, the mixture is discharged to obtain oxidized asphalt powder;

[0038] 4. Put it into a pit furnace and heat up to 600°C for 1 hour at 2°C / min under the protection of nitrogen, and then cool down to room temperature to discharge;

[0039] 5. Put it into an atmosphere furnace and heat it up to 1200°C for 1 hour at 2°C / min under the protection of nitrogen, and then cool it down to room temperature t...

Example Embodiment

[0040] Example 3

[0041] 1. The high-temperature petroleum asphalt with a softening point of 280℃ is crushed by a jet mill classifier to produce a powder with a volume average particle size D50 of 9μm;

[0042] 2. Feed 1000g of the obtained asphalt powder together with 1000g of hydrogen peroxide solution with a mass concentration of 20% in a mixer and mix at 500r / min for 20 minutes and then discharge to obtain a slurry;

[0043] 3. Place the obtained slurry in a blast drying oven at 80°C for 2 hours, and then heat up to 110°C to continue the reaction for 4 hours. After cooling to room temperature, the material is discharged to obtain oxidized asphalt powder;

[0044] 4. Put it into a pit furnace and heat up to 600°C for 1 hour at 2°C / min under the protection of nitrogen, and then cool down to room temperature to discharge;

[0045] 5. Put it into an atmosphere furnace and heat it up to 1200°C for 1 hour at 2°C / min under the protection of nitrogen, and then cool it down to room temperat...

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Abstract

The invention relates to the technical field of lithium ion batteries, and in particular to a method for preparing a high-capacity hard carbon negative electrode material of a lithium ion battery. Themethod comprises the following steps: preparing carbon source precursor powder; mixing the carbon source precursor powder with an oxidant; performing a low temperature oxidation reaction and a high temperature oxidation reaction on the mixture in sequence; and performing a pre-carbonization treatment and a carbonization treatment. Compared with the prior art, the method provided by the inventionhas the advantages that organic carbon sources such as resin and asphalt or the like can be widely used as a base material for hard carbon synthesis, so that the raw material source is wide,and it isconducive to reducing the production cost to a certain extent; furthermore, the preparation process is simple, the conditions are mild and controllable, which is conductive to improving the product batch stability and is suitable for industrial continuous production; and the prepared high-capacity hard carbon negative electrode material has high discharge capacity and first charge and discharge efficiency, and a button battery made of the high-capacity hard carbon negative electrode material has excellent comprehensive performance.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a method for preparing a high-capacity lithium-ion battery hard carbon negative electrode material. Background technique [0002] In the field of energy storage, traditional secondary batteries such as lead-acid batteries, cadmium-nickel batteries, and nickel-metal hydride batteries are used because of their shortcomings such as low energy density, low open circuit voltage, short service life, environmental pollution, memory effect, and high self-discharge rate. Can not meet the needs of the development of portable electronic products. Due to its high energy density, stable charging and discharging platform, wide operating temperature range, low self-discharge rate, long cycle life and environmental friendliness, lithium-ion secondary batteries have become key research areas in the field of new energy. object. In addition to meeting the diverse development needs o...

Claims

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Application Information

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IPC IPC(8): H01M4/587H01M10/0525
CPCY02E60/10
Inventor 葛传长沈龙范拯华曾繁俊吴志红丁晓阳
Owner NINGBO SHANSHAN NEW MATERIAL TECH
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