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Method for preparing anode material of lithium ion battery based on chemically-activated sisal carbon fiber

A lithium-ion battery and sisal fiber technology, applied in chemical instruments and methods, battery electrodes, inorganic chemistry, etc., can solve problems such as short service life, high cost, and poor safety

Active Publication Date: 2013-12-11
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the current technical level is becoming more and more mature, and large-scale industrialization has begun to take shape, lithium-ion batteries still have many shortcomings, such as high cost, poor safety, and short service life. The most critical factor is the lithium-ion battery. electrode material

Method used

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  • Method for preparing anode material of lithium ion battery based on chemically-activated sisal carbon fiber
  • Method for preparing anode material of lithium ion battery based on chemically-activated sisal carbon fiber

Examples

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Embodiment 1

[0016] (1) The raw fibers stripped from sisal leaves are rubbed to remove dandruff, washed with deionized water, and then dried at 80°C for 12 hours.

[0017] (2) Take three parts (6g each) of the sisal fibers obtained in step (1) and place them in beakers respectively, and use 25% ZnCl 2 The solution is according to the ZnCl 2 The mass ratio of sisal fiber and sisal fiber is 2:1, 4:1, 6:1 impregnation than soaking for 24 hours, then ZnCl 2 The residual solution was washed with water until neutral, and dried at 80°C for 12 hours.

[0018] (3) Put the sisal fibers obtained in step (2) into 50ml crucibles respectively, then put them into a vacuum tube resistance furnace, and carbonize for 1 hour under a nitrogen atmosphere with a gas flow rate of 40ml / min, and the carbonization temperature is 900°C. The heating rate was 3°C / min, and black fibrous sisal activated carbon fibers were obtained after natural cooling, which were bagged and sealed for storage.

[0019] (4) The sisal...

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Abstract

The invention discloses a method for preparing an anode material of a lithium ion battery based on chemically-activated sisal carbon fiber. The method comprises the following steps: rubbing, washing and drying sisal fiber; soaking the sisal fiber for 24h by using a ZnCl2 solution with the mass percentage of 15-25% according to the ZnCl2 to sisal fiber impregnation ratio of (2-6):1, flushing the sisal fiber by using deionized water, and drying the sisal fiber at the temperature of 80-100 DEG C for 12-24h; and placing the sisal fiber into a vacuum tubular resistance furnace, carbonizing the sisal fiber at the atmosphere of nitrogen gas and the gas flow of 40ml / min for 0.5-1h, and naturally cooling the sisal fiber to obtain the black fiber-shaped sisal activated carbon fiber, wherein the carbonizing temperature ranges from 700 DEG C to 1000 DEG C, and the temperature rise speed is 1-10 DEG C / min. The lithium ion battery is assembled by taking a lithium tablet as a cathode material and the ground sisal activated carbon fiber as the anode material, a constant-current charging / discharging test is carried out, and the result shows that the sisal carbon fiber subjected to chemical modification treatment has better electrochemical property as comparison with untreated sisal carbon fiber and commercially available activated carbon.

Description

technical field [0001] The invention relates to a method for preparing negative electrode materials of lithium ion batteries based on chemically activated sisal carbon fibers. Background technique [0002] The emergence of lithium-ion batteries has not only completely changed the portable electronic market, but also has begun to be used in electric vehicles in recent years, affecting people's daily life more and more profoundly. Although the current technical level is becoming more and more mature, and large-scale industrialization has begun to take shape, lithium-ion batteries still have many shortcomings, such as high cost, poor safety, and short service life. The most critical factor is the lithium-ion battery. electrode material. With the improvement of people's living standards, the demand for lithium-ion batteries is increasing day by day, and the requirements for performance are also higher and higher. Therefore, finding low-cost, high-capacity electrode materials ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1393C01B31/02C01B32/318C01B32/348
CPCY02E60/10
Inventor 覃爱苗余心亮余卫平杜锐韦春
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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