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Modified silicon monoxide/carbon nanotube composite negative electrode material and preparation method thereof

A carbon nanotube composite and silicon oxide technology, which is applied in the field of lithium-ion batteries, can solve problems such as difficult grafting, difficulty in improving the performance of composite materials, and no obvious improvement in cycle performance and conductivity of electrode materials.

Active Publication Date: 2021-04-20
CHENGDU GUIBAO SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The surface of silicon oxide is rich in hydroxyl groups, which makes it have a hydrophilic polar surface. It has a large surface area and high surface energy. Properties of Composite Materials
At present, the cycle performance and conductivity of electrode materials have not been significantly improved after grafting organic substances on the surface of silicon oxide.

Method used

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  • Modified silicon monoxide/carbon nanotube composite negative electrode material and preparation method thereof
  • Modified silicon monoxide/carbon nanotube composite negative electrode material and preparation method thereof
  • Modified silicon monoxide/carbon nanotube composite negative electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Take a certain amount of deionized water in a beaker, then add 3g of silane coupling agent KH-560 into the beaker, adjust the pH value to 6.5 with sodium hydroxide and acetic acid, and let it stand for 1h; weigh 30g of oxidized Put the silica particles in a beaker, add the same amount of ethanol and water, and disperse them ultrasonically for 30 minutes; mix the uniformly dispersed silica and the hydrolyzed silane coupling agent KH-560 into the reaction kettle, and then add 0.3g Surfactant dodecyl dimethyl betaine, through N 2 , heated to 140° C., stirred at this temperature for 4 hours, filtered with suction, washed with ethanol, and dried in a vacuum oven at 80° C. to obtain modified silicon oxide.

[0036] Acidification of carbon nanotubes: Weigh 5g of carbon nanotubes (radius distribution 40-60nm, length distribution 4-6μm, purity 99%) in a 250ml round bottom flask, add 45ml concentrated HNO 3 , stir evenly, and then slowly add 15ml of concentrated H 2 SO 4 , hea...

Embodiment 2

[0042] Take a certain amount of deionized water in a beaker, then add 1.5g of silane coupling agent KH-560 to the beaker, adjust the pH value to 6.5 with sodium hydroxide and acetic acid, and let it stand for 1h; weigh 30g of silane coupling agent with a particle size of 200nm Put the silica particles in a beaker, add the same amount of ethanol and water, and disperse them ultrasonically for 30 minutes; mix the uniformly dispersed silica and the hydrolyzed silane coupling agent KH-560 into the reaction kettle, and then add 0.3 g of surfactant lauryl dimethyl betaine, passed through N 2 , heated to 140° C., stirred at this temperature for 4 hours, filtered with suction, washed with ethanol, and dried in a vacuum oven at 80° C. to obtain modified silicon oxide.

[0043] All the other steps are the same as in Example 1, and the powder sample B is finally obtained.

[0044] Sample B was used as the negative electrode active material to assemble the button battery, and the constan...

Embodiment 3

[0046] Take a certain amount of deionized water in a beaker, then add 4.5g of silane coupling agent KH-560 to the beaker, adjust the pH value to 6.5 with sodium hydroxide and acetic acid, and let it stand for 1h; weigh 30g of silane coupling agent with a particle size of 200nm Put the silica particles in a beaker, add the same amount of ethanol and water, and disperse them ultrasonically for 30 minutes; mix the uniformly dispersed silica and the hydrolyzed silane coupling agent KH-560 into the reaction kettle, and then add 0.3 g of surfactant lauryl dimethyl betaine, passed through N 2 , heated to 140° C., stirred at this temperature for 4 hours, filtered with suction, washed with ethanol, and dried in a vacuum oven at 80° C. to obtain modified silicon oxide.

[0047] All the other steps are the same as in Example 1, finally obtaining powder sample C.

[0048] The sample C was used as the negative electrode active material to assemble the button battery, and the constant curr...

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Abstract

The invention discloses a modified silicon monoxide / carbon nanotube composite negative electrode material and a preparation method thereof. The preparation method comprises the following steps: pre-hydrolyzing a silane coupling agent, ultrasonically dispersing the pre-hydrolyzed silane coupling agent, silicon monoxide and a surfactant in a solvent to obtain a dispersion liquid, and heating and stirring the dispersion liquid in a reaction kettle in an inert atmosphere to obtain a modified silicon monoxide solution; and mixing the modified silicon monoxide solution with carbon nanotubes, carrying out ultrasonic dispersion, suction filtration, washing and drying, adding the obtained product into a carbon source, carrying out mixing coating, sintering, and crushing to obtain the modified silicon monoxide / carbon nanotube composite negative electrode material. Silicon monoxide particles are subjected to surface modification, a proper amount of carbon nanotubes are added into the silicon monoxide negative electrode material, and the surface of the modified silicon monoxide is coated with a layer of carbon source, so that the cycle performance of the negative electrode material is effectively improved.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, more specifically, the invention relates to a modified silicon oxide / carbon nanotube composite negative electrode material and a preparation method thereof. Background technique [0002] The theoretical specific capacity of pure silicon is as high as 4200mAh.g -1 , The theoretical specific capacity of graphite is 372mAh.g-1, the difference between the two is more than 10 times. Moreover, the lithium alloying voltage of silicon is moderate, and the lithium precipitation reaction is not easy to occur on the surface during charging, and the safety performance is better. Therefore, silicon-based materials have become one of the future research directions for lithium-ion battery anode materials. [0003] However, during the lithium alloying / dealloying process of silicon-based anode materials, Li + Constantly embedded / extruded, the volume changes dramatically, and the expansion rate is as high as...

Claims

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Application Information

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IPC IPC(8): C01B32/168C01B32/174C01B33/113H01M4/36H01M4/48H01M4/62H01M10/0525
CPCY02E60/10
Inventor 王有治张君玉黄强罗才坤贺金味
Owner CHENGDU GUIBAO SCI & TECH
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