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Method for preparing lithium ion battery silicon-carbon composite negative electrode material by taking konjac flour as carbon source

A technology for lithium-ion batteries and negative electrode materials, which is applied in the direction of battery electrodes, negative electrodes, secondary batteries, etc., can solve the problems of electrode powdering, capacity attenuation, active material detachment, etc., and achieves mild experimental conditions, simple preparation conditions, low cost effect

Active Publication Date: 2018-09-21
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, silicon, like other alloy anode materials, also faces an important challenge: during the alloying and dealloying process of charging and discharging, the silicon-based host will produce a volume expansion greater than 400% of the original volume.
This volume phase change will cause the pulverization and fracture of the electrode as a whole, so that the active material will be separated from the current collector, and finally lead to a rapid decline in capacity.

Method used

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  • Method for preparing lithium ion battery silicon-carbon composite negative electrode material by taking konjac flour as carbon source
  • Method for preparing lithium ion battery silicon-carbon composite negative electrode material by taking konjac flour as carbon source
  • Method for preparing lithium ion battery silicon-carbon composite negative electrode material by taking konjac flour as carbon source

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment 1: Preparation and characterization of a lithium-ion battery silicon-carbon composite negative electrode material using konjac flour as a carbon source:

[0031] Disperse 0.5g of biomaterial konjac flour into 100ml of deionized water, stir well to obtain a gel-like substance. Disperse 0.5g of silicon powder with a particle size of 200 nanometers into a mixed solution of ethanol and water (volume ratio) at a ratio of 2:1, ultrasonically disperse to obtain a suspension, and slowly add the obtained suspension to the above gel Stir for 6 hours on a magnetic stirrer; place the obtained sample in a drying oven and dry at 100°C for 8 hours, and grind it evenly to obtain a brown-black powder; put the brown-black powder in an inert gas atmosphere at 400°C Keep the temperature for 3 hours, then raise the temperature to 800° C., and keep the temperature for 6 hours to obtain the silicon-carbon composite negative electrode material, which is applied to the lithium-ion ba...

Embodiment 2

[0036] Example 2: Preparation and characterization of a silicon-carbon composite negative electrode material for lithium-ion batteries using konjac flour as a carbon source

[0037] Disperse 0.5g of biomaterial konjac flour into 100ml of deionized water, stir well to obtain a gel-like substance. Disperse 0.5g of silicon powder with a particle size of 500nm into a mixed solution of ethanol and water (volume ratio) at a ratio of 2:1, and ultrasonically disperse to obtain a suspension, which is slowly added to the above gel Stir for 6 hours on a magnetic stirrer; place the obtained sample in a freeze-drying box to dry for 8 hours, and grind it evenly to obtain a brown-black powder; keep the brown-black powder at 400°C for 3 hours in an inert gas atmosphere, and then The temperature was raised to 900° C., and the temperature was kept for 6 hours to obtain a silicon-carbon composite negative electrode material, which was applied to a lithium-ion battery.

Embodiment 3

[0038] Example 3: Preparation and characterization of a silicon-carbon composite negative electrode material for lithium-ion batteries using konjac flour as a carbon source

[0039] Disperse 1 g of konjac flour into 100 ml of deionized water, stir well to obtain a gelatinous substance. Disperse 0.5g of silicon powder with a particle size of 100 nanometers into a mixed solution with a ratio of ethanol and water (volume ratio) of 1:3, ultrasonically disperse to obtain a suspension, and slowly add the obtained suspension to the obtained In the gel-like substance, stir on a magnetic stirrer for 6 hours; place the obtained sample in a drying oven and dry at 100°C for 8 hours, and grind it evenly to obtain a brown-black powder; put the brown-black powder in an inert gas atmosphere at 400°C The temperature was kept for 3 hours under the condition, then the temperature was raised to 700°C, and the temperature was kept for 6 hours to obtain a silicon-carbon composite negative electrode...

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Abstract

The invention discloses a method for preparing a lithium ion battery silicon-carbon composite negative electrode material by taking konjac flour as a carbon source, and belongs to the technical fieldof an energy new material. The method comprises the following steps: ultrasonically dispersing the konjac flour into water to form a gel-like material, adding silicon powder into the gel-like materialby a magnetic stirrer, stirring for 2 to 12 hours, drying, placing a sample into a tubular furnace, performing heat preservation at 200 to 400 DEG C for 1 to 4 hours in the atmosphere of inert gas, heating to 500 to 900 DEG C, performing heat preservation for 1 to 8 hours, cooling to room temperature, and grinding uniformly to obtain the silicon-carbon composite negative electrode material. The method is simple in process and mild in experiment condition; and the prepared silicon-carbon composite negative electrode material has high specific capacity and high cycling performance and is suitable for large-scale production.

Description

technical field [0001] The invention relates to a method for preparing a silicon-carbon composite negative electrode material for a lithium ion battery, in particular to a silicon-carbon composite negative electrode material for a lithium ion battery that is suitable for the technical field of new energy materials and uses biomass material konjac powder as a carbon source Methods. Background technique [0002] Among many emerging energy sources, lithium-ion batteries stand out due to their many advantages in terms of power and environmental protection, and have been widely used in various fields such as life, production and national defense. However, with the further improvement of mobile electronic devices' demand for portability and battery life, as well as the development of power equipment such as drones and electric vehicles and large-capacity energy storage batteries, the traditional lithium cobalt oxide graphite system lithium-ion batteries have gradually become incap...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525
CPCH01M4/362H01M4/386H01M4/625H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 鞠治成赵伟蔡佩君庄全超史月丽
Owner CHINA UNIV OF MINING & TECH
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