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B and N co-doped graphene coated silicon nano negative electrode material and preparation method thereof

A graphene-coated, negative-electrode material technology, applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problem of not being able to adapt to large current charging and discharging, and not fundamentally inhibiting the volume expansion of silicon particles and other issues, to achieve the effects of stable structure, high rate performance, and good lithium storage performance

Active Publication Date: 2020-04-21
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this material alleviates the expansion of silicon materials during discharge to a certain extent, thereby improving the cycle performance of battery materials, this method cannot fundamentally inhibit the volume expansion of silicon particles, and cannot adapt to high-current charging and discharging.

Method used

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  • B and N co-doped graphene coated silicon nano negative electrode material and preparation method thereof
  • B and N co-doped graphene coated silicon nano negative electrode material and preparation method thereof
  • B and N co-doped graphene coated silicon nano negative electrode material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0042] Example 1 B, N co-doped graphene-coated silicon nano-anode material

[0043] The negative electrode material is made of B and N co-doped graphene coated with silicon nanoparticles at a mass ratio of 1:1; the doping amounts of B and N in the B and N co-doped graphene are 7.37% respectively , 5.9%; the average particle size of the silicon nanoparticles is 30nm.

[0044] Such as figure 1 , 2 As shown, the average particle size of the silicon nanoparticles is 30nm, and graphene is coated on the surface of the silicon nanoparticles.

[0045] Such as image 3 , 4 As shown, XPS has clearly detected the energy spectrum peaks of B and N, indicating that boron and nitrogen atoms are successfully doped in the embodiment of the present invention B and N co-doped graphene-coated silicon nano-anode materials, and B, N are obtained by calculation. The doping amounts of N are 7.37% and 5.9%, respectively.

[0046] Embodiment 1 B, the preparation method of N co-doped graphene-coat...

Embodiment 2

[0053] Example 2 B, N co-doped graphene-coated silicon nano-anode material

[0054] The negative electrode material is made of B and N co-doped graphene coated with silicon nanoparticles at a mass ratio of 1.5:1; the doping amounts of B and N in the B and N co-doped graphene are 2.64% respectively , 7.6%; the average particle size of the silicon nanoparticles is 60nm.

[0055] After testing, the average particle size of the silicon nanoparticles is 60nm, and the graphene is coated on the surface of the silicon nanoparticles.

[0056] After testing, XPS has clearly detected the energy spectrum peaks of B and N, indicating that the boron and nitrogen atoms in the B and N co-doped graphene-coated silicon nano negative electrode materials of the embodiment of the present invention are successfully doped, and B, N are obtained by calculation. The doping amounts of N are 2.64% and 7.6%, respectively.

[0057] Example 2 B, the preparation method of N co-doped graphene-coated silico...

Embodiment 3

[0064] Example 3 B, N co-doped graphene-coated silicon nano-anode material

[0065] The negative electrode material is made of B and N co-doped graphene coated with silicon nanoparticles at a mass ratio of 0.6:1; the doping amounts of B and N in the B and N co-doped graphene are 9.3% respectively , 3.2%; the average particle size of the silicon nanoparticles is 20nm.

[0066] After testing, the average particle size of the silicon nanoparticles is 20nm, and the graphene is coated on the surface of the silicon nanoparticles.

[0067] After testing, XPS has clearly detected the energy spectrum peaks of B and N, indicating that the boron and nitrogen atoms in the B and N co-doped graphene-coated silicon nano negative electrode materials of the embodiment of the present invention are successfully doped, and B, N are obtained by calculation. The doping amounts of N are 9.3% and 3.2%, respectively.

[0068] Example 3 B, the preparation method of N co-doped graphene-coated silicon ...

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Abstract

The invention discloses a B and N co-doped graphene coated silicon nano negative electrode material and a preparation method thereof. The negative electrode material is prepared from B and N co-dopedgraphene coated silicon nano particles. The preparation method comprises the following steps: (1) adding graphene oxide powder into water, and carrying out ultrasonic dispersion to obtain a graphene oxide aqueous dispersion; (2) adding silicon nanoparticles and a nitrogen source into the graphene oxide aqueous dispersion, carrying out primary ultrasonic dispersion, adding a boron source, carryingout secondary ultrasonic dispersion, and carrying out freeze drying to obtain a B and N-containing graphene oxide coated silicon nano composite material; and (3) in an inert atmosphere, carrying out heat treatment on the B and N-containing graphene oxide coated silicon nano composite material, washing with water, and drying to obtain the material. The battery assembled by the negative electrode material well solves the problem that the volume of the silicon negative electrode material is sharply expanded in the charging and discharging process and is good in cycle performance and high-rate electrochemical performance and low in cost; and the method is simple in process and suitable for industrial production.

Description

technical field [0001] The invention relates to a silicon nanometer negative electrode material and a preparation method thereof, in particular to a B and N co-doped graphene-coated silicon nanometer negative electrode material and a preparation method thereof. Background technique [0002] Due to the characteristics of high voltage, high specific energy, long cycle life and environmental friendliness, lithium-ion batteries have become ideal supporting power sources for portable electronic products, mobile products, and electric vehicles. Affected by the rapid development of portable electronic devices, mobile products, and electric vehicles, new lithium-ion batteries with high energy density and high specific capacity are urgently needed, and the development of new lithium-ion battery anode materials is the key. The theoretical capacity of traditional graphite anode is only 372 mAh g -1 , has seriously restricted the development of the entire lithium-ion battery industry. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62B82Y30/00H01M10/0525
CPCH01M4/366H01M4/386H01M4/625H01M4/628B82Y30/00H01M10/0525Y02E60/10
Inventor 喻万景王杰安添辉戴琼雨赵放刘凡王朝磊童汇
Owner CENT SOUTH UNIV
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