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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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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 hard carbon negative electrode material with simple process, wide source of raw materials, low cost, excellent electrochemical performance, and stable and consistent performance

Method used

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

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Embodiment 1

[0028] 1. The high-temperature petroleum asphalt with a softening point of 280°C is pulverized by an airflow milling classifier to make a powder with a volume average particle diameter D50 of 9 μm; in this example, the crushing method is preferably airflow milling, and the compressed air pressure of the airflow milling is 8~ 9Mpa, feeding frequency is 15~25Hz;

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

[0030] 3. Place the obtained mixture in an air-blast drying oven at 80°C for 2 hours, then raise the temperature to 150°C and continue the reaction for 2 hours, and then discharge the mixture to obtain oxidized asphalt powder after cooling to room temperature;

[0031] 4. Then put it into the well-type furnace and raise the temperature to 600°C for 1 hour under the protection of nitrogen at 2°C / min, then cool down to r...

Embodiment 2

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

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

[0037] 3. Place the obtained mixture in a blast drying oven at 100°C for 2 hours, then raise the temperature to 200°C and continue the reaction for 2 hours, cool to room temperature and discharge to obtain oxidized asphalt powder;

[0038] 4. Then put it into the well-type furnace and raise the temperature to 600°C for 1 hour under the protection of nitrogen at 2°C / min, then cool down to room temperature and discharge;

[0039] 5. Then put it into an atmosphere furnace, raise the temperature to 1200°C for 1 hour under the protection of nitrogen at 2°C / min, cool down to room temperature and di...

Embodiment 3

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

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

[0043] 3. Place the obtained slurry in an air-blast drying oven at 80°C for 2 hours, then raise the temperature to 110°C and continue the reaction for 4 hours, and then discharge to obtain oxidized asphalt powder after cooling to room temperature;

[0044] 4. Then put it into the well-type furnace and raise the temperature to 600°C for 1 hour under the protection of nitrogen at 2°C / min, then cool down to room temperature and discharge;

[0045] 5. Then put it into an atmosphere furnace, raise the temperature to 1200°C for 1 hour under the protection of nitrogen at 2°C / min, cool d...

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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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