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A kind of electrode material and its preparation method using oil cake after rolling oil as carbon source

A negative electrode material and oil cake technology, which is applied in the field of preparation of lithium ion battery negative electrode materials, can solve the problems of resource waste and low comprehensive utilization rate, and achieve the effects of easy operation, good electrochemical performance, and simple pyrolysis method

Active Publication Date: 2017-12-22
HUNAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Oil cakes, such as common rapeseed cakes, peanut cakes, soybean cakes, tea seed cakes, sunflower seed cakes, chestnut cakes, etc., are discarded as garbage, and some are used as feed for pigs, and only a small amount of oil cakes are used as food. It can be seen that its comprehensive utilization rate is low, resulting in a huge waste of resources

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Soak the rapeseed cake in a mixed solution of hydrofluoric acid and dilute nitric acid for 3 days, wash it with distilled water until it becomes neutral, and then put it in a blast drying oven to dry for 8 hours. Then put the dried rapeseed cake into a tube furnace, and burn it at 500° C. for 6 hours under the protection of nitrogen. The obtained rapeseed cake carbon was processed by the following two methods after grinding: ① Guidance: mixed carbon powder and silicon carbide for 4 hours, the speed was 300r / min, and the amount of silicon carbide was 5% of the mass of carbon powder. ② Promotion: Soak the carbon powder in carbonyl iron solution for 3 days, and the amount of carbonyl iron is 5% of the carbon powder mass. Finally, the treated carbon was put into a high-temperature sintering furnace and sintered at 2100° C. under the protection of nitrogen, and the obtained carbon material was used as the negative electrode material of lithium-ion batteries.

[0019] After ...

Embodiment 2

[0021] Soak the soybean cake in a mixed solution of hydrofluoric acid and dilute nitric acid for 5 days, wash it with distilled water until neutral, and then put it in a blast drying oven for 10 hours to dry. Then put the dried soybean cake into a tube furnace and burn it at 700°C for 8 hours under the protection of argon. After carbon grinding, the obtained soybean cake was treated by the following two methods: ① Guidance: Mix carbon powder and boron carbide for 5 hours, the speed is 350r / min, and the amount of boron carbide is 6% of the mass of carbon powder. ② Promotion: Soak the carbon powder in ferric chloride solution for 4 days, and the amount of ferric chloride is 6% of the mass of carbon powder. Finally, the treated carbon is put into a high-temperature sintering furnace, and sintered at 2300° C. under the protection of argon, and the obtained carbon material is used as the negative electrode material of the lithium-ion battery.

[0022] After testing, the carbon mat...

Embodiment 3

[0024] Soak the sesame cake in a mixed solution of hydrofluoric acid and dilute nitric acid for 4 days, wash it with distilled water until neutral, and then put it in a blast drying oven for 12 hours to dry. Then put the dried sesame cake into a tube furnace, and burn it at 900°C for 10 hours under the protection of nitrogen. The obtained sesame carbon was processed by the following two methods after grinding: ① Guidance: mixed carbon powder and flake graphite for 6 hours, the speed was 400r / min, and the amount of flake graphite was 7% of the mass of carbon powder. ② Promotion: Soak carbon powder in boron tribromide solution for 4 days, and the amount of boron tribromide is 7% of the mass of carbon powder. Finally, the treated carbon was put into a high-temperature sintering furnace, and sintered at 2500° C. under the protection of nitrogen, and the obtained carbon material was used as the negative electrode material of lithium-ion batteries.

[0025] After testing, the carbo...

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PUM

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Abstract

The invention discloses a carbon material using a rolled oil cake as a carbon source and a preparation method of the carbon material. The carbon material is used as a lithium-ion battery anode material. The preparation method comprises the following steps: using a carbon material precursor from common solid wastes in life, and particularly, using the rolled oil cake as the carbon source; placing the oil cake in a hydrofluoric acid-dilute nitric acid mixed solution for soaking for a certain time after being ground, washing and drying; placing the soaked oil cake in a tube furnace for carbonization treatment under the protection of an inert gas, grinding the obtained carbon material, performing graphitization treatment in a high temperature sintering furnace respectively through a guiding method and a promotion method in a protective atmosphere to finally obtain the graphited carbon material which has a relatively high crystalline degree and used as the lithium-ion battery anode material. The lithium-ion battery anode material prepared from the carbon material is high in specific capacity, and good in cycle performance, the preparation method is simple and feasible, low in cost, and environment-friendly, and has a good application prospect.

Description

technical field [0001] The invention relates to the technical field of electrode material manufacturing technology, in particular to a preparation method of a negative electrode material of a lithium ion battery. Background technique [0002] The development of lithium-ion batteries originated in the 1990s. In the past 20 years, the lithium battery industry has developed rapidly. With the emphasis on the environment and new energy in various countries, lithium-ion batteries have put forward higher requirements for the development of environmentally friendly and high-performance lithium storage positive and negative electrode materials. Generally speaking, the anode material is the main body of lithium-ion battery storage, and the intercalation and extraction of lithium ions during the charging and discharging process is the key to improving the overall specific capacity, cycle performance, charge-discharge and other related performance of lithium-ion batteries. The current ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/133H01M4/1393
CPCH01M4/583H01M10/0525Y02E60/10
Inventor 陈晗茹皓辉周伟张优良向楷雄
Owner HUNAN UNIV OF TECH