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A silicon-based/graphene nanoribbon composite material with high capacity and high cycle efficiency and its preparation method

A graphene nanoribbon, composite material technology, applied in graphene, nanotechnology for materials and surface science, nanocarbon, etc., can solve the problems of insufficient charge and discharge performance, high first coulomb efficiency, complex preparation process, etc. Achieve the effect of overcoming chalking and shedding, improving coulomb efficiency and simple process

Active Publication Date: 2022-06-28
重庆锦添翼新能源科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a silicon-based / graphene nanoribbon composite material with high capacity and high cycle efficiency and a preparation method thereof for the existing silicon-carbon composite material with complex preparation process, high cost and insufficient charge-discharge performance. The advantages of simple process, convenient operation, low production cost, good production safety, etc., are convenient for popularization and application, and are conducive to realizing large-scale production; in addition, the pre-lithiated silicon-based / graphene nanoribbon composite material prepared by the method of the present invention has High specific capacity, high first Coulombic efficiency, long cycle life, high rate performance, etc., can form a self-supporting porous film without adding a binder, suitable for high specific energy lithium-ion battery anode materials

Method used

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  • A silicon-based/graphene nanoribbon composite material with high capacity and high cycle efficiency and its preparation method
  • A silicon-based/graphene nanoribbon composite material with high capacity and high cycle efficiency and its preparation method
  • A silicon-based/graphene nanoribbon composite material with high capacity and high cycle efficiency and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] A silicon-based / graphene nanoribbon composite material with high capacity and high cycle efficiency, the components and their mass percentages are:

[0076] Nano silicon 87%

[0077] Graphene Nanoribbons 10%

[0078] Lithium 3%

[0079] Among them, the average particle size of nano-silicon is 10nm, and the specific surface area is 120m 2 ·g -1 , the pore volume is 0.81cm 3 ·g -1 ; The graphene nanoribbons have a diameter of 5 nm, a length of 10 μm, and a carbon content of 95%.

[0080] A preparation method of a silicon-based / graphene nanobelt composite material with high capacity and high cycle efficiency, the specific steps are as follows:

[0081] (1) Preparation of nano-silicon suspension

[0082] The nano-silicon / polydiallyl dimethyl ammonium chloride / deionized water was mixed and stirred for 240 min according to the ratio of 1 g: 0.1 g: 1000 mL to prepare a positively charged nano-silicon suspension.

[0083] (2) Preparation of nano-silicon / graphene nanorib...

Embodiment 2

[0088] A silicon-based / graphene nanoribbon composite material with high capacity and high cycle efficiency, the components and their mass percentages are:

[0089] Silica 64%

[0090] Graphene Nanoribbons 30%

[0091] Lithium 6%

[0092]Among them, the average particle size of silicon oxide is 300nm, and the specific surface area is 50m 2 ·g -1 , the hole volume is 0.25cm 3 ·g -1 ; The graphene nanoribbons have a diameter of 10 nm, a length of 30 μm, and a carbon content of 98%.

[0093] A preparation method of a high-capacity and high-cycle-efficiency silicon-based / graphene nanobelt composite material is the same as in Example 1, and the difference from Example 1 is:

[0094] In step (1), silicon oxide / hexadecyltrimethylammonium bromide / deionized water are mixed and stirred for 240min according to the ratio of 1g:0.5g:100mL;

[0095] In step (2), the graphene nanoribbons were ultrasonically dispersed for 3 hours, the concentration was 3 mol / L, the mass ratio of graphen...

Embodiment 3

[0098] A silicon-based / graphene nanoribbon composite material with high capacity and high cycle efficiency, the components and their mass percentages are:

[0099] Porous silicon 10%

[0100] Graphene Nanoribbons 89%

[0101] Lithium 1%

[0102] Among them, the average particle size of porous silicon is 30 μm, and the specific surface area is 200 m 2 ·g -1 , the hole volume is 1.5cm 3 ·g -1 ; The graphene nanoribbons have a diameter of 50 nm, a length of 60 μm, and a carbon content of 99%.

[0103] A preparation method of a high-capacity and high-cycle-efficiency silicon-based / graphene nanobelt composite material is the same as in Example 1, and the difference from Example 1 is:

[0104] In step (1), a silicon-aluminum alloy with a silicon content of 20% is used as a raw material, added to a 0.5 mol / L hydrochloric acid solution, stirred for 24 hours, centrifuged and dried at 60° C. for 10 hours to obtain porous silicon powder. Alkyldimethylbenzyl quaternary ammonium chl...

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Abstract

The invention discloses a silicon base / graphene nanobelt composite material with high capacity and high cycle efficiency and a preparation method thereof, belonging to the technical field of chemical power sources. The composite material of the present invention comprises the following components by mass percentage: silicon-based material 10-98%, graphene nanobelt 1-89%, lithium element 1-10%; the present invention treats the silicon-based material with a surfactant to make it Carry a positive static charge, then mix the treated silicon-based material and graphene nanobelts by stirring, collect, dry, and treat at high temperature to obtain a composite material; then directly contact the obtained composite material with a lithium sheet mechanically, through adjustment Externally applied pressure and pressure application time achieve controllable pre-lithiation. The invention has the characteristics of simple process and convenient operation, and the silicon base / graphene nanoribbon composite material prepared by the invention has high specific capacity, high first Coulombic efficiency, long cycle life and strong rate performance, and can be applied to high specific energy Lithium Ion Battery.

Description

technical field [0001] The invention relates to the technical field of chemical power supply lithium ion batteries, and more particularly to a prelithiated silicon-based / graphene nanobelt composite material with high capacity and high cycle efficiency and a preparation method thereof. Background technique [0002] The rapid development of electric vehicles has put forward higher requirements for the energy density of lithium-ion batteries. However, due to the low specific capacity of electrode materials, the current commercial power batteries have low battery energy density, which limits the cruising range of electric vehicles. Especially the graphite anode of lithium ion battery has a theoretical specific capacity of only 372mAh / g, which greatly limits the energy density of the battery. Therefore, it is urgent to develop an emerging anode material to improve the energy density of the battery. [0003] Silicon anode material has obvious advantages because of its high theoret...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/19C01B32/184C01B33/02H01M4/38H01M4/48H01M4/62H01M10/0525B82Y30/00B82Y40/00
CPCC01B32/19C01B32/184C01B33/02H01M4/386H01M4/483H01M4/625H01M10/0525B82Y30/00B82Y40/00C01B2204/22C01B2204/30C01B2204/32Y02E60/10
Inventor 李新禄姚丛王荣华
Owner 重庆锦添翼新能源科技有限公司
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