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Boron nitride nanotube/silicon/carbon nanotube composite material and preparation and application

A technology of boron nitride nanotubes and carbon nanotubes, applied in electrochemical generators, electrical components, battery electrodes, etc., can solve the problems that affect the wide application of silicon-based negative electrode materials, poor conductivity, etc., and achieve excellent electrochemical performance , good volume change, and the effect of improving the magnification performance

Active Publication Date: 2018-03-30
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Silicon-based negative electrode materials have higher theoretical specific capacity than traditional graphite materials, but they also face huge challenges. High theoretical specific capacity silicon-based negative electrode materials face 300% volume expansion and poor conductivity, which seriously affects silicon-based negative electrodes. Wide application of materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A method for preparing a boron nitride nanotube / silicon / carbon nanotube composite material, comprising the steps of: adding 30 g of boron nitride nanotubes to 200 mL of a 10% ammonia solution, ultrasonically vibrating for 3 hours, cleaning, and drying to obtain a pre-prepared Treat boron nitride nanotubes; add 20g of pretreated boron nitride nanotubes and 20g of carbon nanotubes to N-methylpyrrolidone, ultrasonically oscillate, then add 10g of nano-silicon powder with an average particle size of 5 μm, and ultrasonically oscillate for 3 hours. drying, drying at 100° C. for 15 hours, and grinding to obtain a boron nitride nanotube / silicon / carbon nanotube composite material with a silicon mass percentage of 20%.

[0018] 30 g of the boron nitride nanotube / silicon / carbon nanotube composite material obtained in this example were dry-milled using a 2L alumina ball mill to obtain a negative electrode material for a lithium-ion battery. According to the following method, the ba...

Embodiment 2

[0024] A method for preparing a boron nitride nanotube / silicon / carbon nanotube composite material, comprising the steps of: adding 30 g of boron nitride nanotubes to 200 mL of a 10% ammonia solution, ultrasonically vibrating for 3 hours, cleaning, and drying to obtain a pre-prepared Treat boron nitride nanotubes; add 35g of pretreated boron nitride nanotubes and 35g of carbon nanotubes to N-methylpyrrolidone, ultrasonically oscillate, then add 30g of nano-silicon powder with an average particle size of 5 μm, and ultrasonically oscillate for 3 hours. drying, drying at 100° C. for 15 hours, and grinding to obtain a boron nitride nanotube / silicon / carbon nanotube composite material with a silicon mass percentage of 30%.

[0025] According to the same method as in Example 1, a lithium-ion secondary battery was prepared using the boron nitride nanotube / silicon / carbon nanotube composite material obtained in this example.

[0026] The experimental results are as follows: the initial c...

Embodiment 3

[0028] A method for preparing a boron nitride nanotube / silicon / carbon nanotube composite material, comprising the steps of: adding 30 g of boron nitride nanotubes to 200 mL of a 10% ammonia solution, ultrasonically vibrating for 3 hours, cleaning, and drying to obtain a pre-prepared Treat boron nitride nanotubes; add 25g of pretreated boron nitride nanotubes and 25g of carbon nanotubes to N-methylpyrrolidone, ultrasonically oscillate, then add 50g of nano-silicon powder with an average particle size of 5 μm, and ultrasonically oscillate for 3 hours. drying, drying at 100° C. for 15 hours, and grinding to obtain a boron nitride nanotube / silicon / carbon nanotube composite material with a silicon content of 50% by mass.

[0029] According to the same method as in Example 1, a lithium-ion secondary battery was prepared using the boron nitride nanotube / silicon / carbon nanotube composite material obtained in this example.

[0030] The experimental results are as follows: the initial c...

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Abstract

The invention discloses a boron nitride nanotube / silicon / carbon nanotube composite material. The composite material comprises a silicon material, boron nitride nanotubes and carbon nanotubes, whereinthe content of the silicon material is 10 wt% to 90 wt%, and the sum of the content of the boron nitride nanotubes and the content of the carbon nanotubes is 10 wt% to 90 wt%. The invention also discloses a preparation method of the boron nitride nanotube / silicon / carbon nanotube composite material and application in the preparation of a lithium ion battery negative electrode material. In the invention, due to the fact that the boron nitride nanotubes are high in high temperature resistance and oxidation resistance, the boron nitride nanotubes can serve as structural support, and simultaneouslya part of nanometer silicon can be embedded into the interiors of the modified boron nitride nanotubes, the volume change of silicon particles in the charging and discharging process is relieved, thecarbon nanotubes are high in electron electric conductivity and ion electric conductivity, and the boron nitride nanotube / silicon / carbon nanotube composite material can develop excellent electrochemical performance of a silicon-based negative electrode while overcoming the disadvantages of the silicon-based negative electrode material, so that the composite material can be widely applied to lithium ion battery negative electrode materials.

Description

technical field [0001] The invention relates to the technical field of negative electrode materials for lithium ion batteries, in particular to a boron nitride nanotube / silicon / carbon nanotube composite material and its preparation and application. Background technique [0002] As one of the new generation of green energy, lithium-ion batteries have high energy density and good cycle performance, and are widely used in portable electronic devices, electric vehicle power supplies and electric energy storage systems. Compared with the mileage of a single charge of a traditional internal combustion engine vehicle (600-800km), there is still a large gap between the current power lithium-ion battery (200-400km). The current commercial lithium-ion battery anode materials mainly use graphite. The volume change of graphite anode material is small when deintercalating lithium ions, which can effectively prevent lithium dendrites. The theoretical capacity of graphite is as high as 3...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M10/0525H01M4/583H01M4/62H01M4/58
CPCH01M4/362H01M4/58H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 廖云龙杨茂萍齐美洲
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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