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Silicon-based/graphene nanobelt composite material with high capacity and high cycle efficiency and preparation method thereof

A technology of graphene nanobelts and composite materials, applied in the direction of graphene, nanotechnology for materials and surface science, nanocarbon, etc., which can solve the problems of insufficient charge and discharge performance, high cost, and long cycle life

Active Publication Date: 2020-08-14
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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  • Silicon-based/graphene nanobelt composite material with high capacity and high cycle efficiency and preparation method thereof
  • Silicon-based/graphene nanobelt composite material with high capacity and high cycle efficiency and preparation method thereof
  • Silicon-based/graphene nanobelt composite material with high capacity and high cycle efficiency and preparation method thereof

Examples

Experimental program
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Embodiment 1

[0075] A silicon-based / graphene nanoribbon composite material with high capacity and high cycle efficiency, each component and its mass percentage 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 nanoribbon has a diameter of 5 nm, a length of 10 μm, and a carbon content of 95%.

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

[0081] (1) Preparation of nano silicon suspension

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

[0083] (2) Preparation of nano-silicon / graphene nanoribbon composites

...

Embodiment 2

[0088] A silicon-based / graphene nanoribbon composite material with high capacity and high cycle efficiency, each component and its mass percentage are:

[0089] Silicon oxide 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 pore volume is 0.25cm 3 g -1 ; The graphene nanoribbon has a diameter of 10 nm, a length of 30 μm, and a carbon content of 98%.

[0093] A kind of preparation method of silicon base / graphene nanoribbon composite material with high capacity and high cycle efficiency is the same as embodiment 1, and the difference with embodiment 1 is:

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

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

Embodiment 3

[0098] A silicon-based / graphene nanoribbon composite material with high capacity and high cycle efficiency, each component and its mass percentage are:

[0099] Porous silicon 10%

[0100] Graphene Nanoribbons 89%

[0101] Lithium element 1%

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

[0103] A kind of preparation method of silicon base / graphene nanoribbon composite material with high capacity and high cycle efficiency is the same as embodiment 1, and the difference with embodiment 1 is:

[0104] In step (1), the 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 and stirred for 24 hours, and then dried at 60°C for 10 hours after centrifugation to obtain a porous silicon powder. Alkyl dimethyl...

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Abstract

The invention discloses a silicon-based / graphene nanobelt composite material with high capacity and high cycle efficiency and a preparation method thereof, and belongs to the technical field of chemical power supplies. The composite material comprises the following components in percentage by mass: 10-98% of a silicon-based material, 1-89% of graphene nanoribbons and 1-10% of a lithium element, the preparation method comprises the following steps: treating a silicon-based material with a surfactant to enable the silicon-based material to be charged with positive static charges, then stirring and mixing the treated silicon-based material and graphene nanoribbons, collecting, drying, carrying out high-temperature treatment to obtain a composite material, then making the obtained composite material directly in mechanical contact with a lithium sheet, and adjusting external pressure and pressure time so that controllable pre-lithiation is realized. The preparation method has the characteristics of simple process and convenience in operation, and the silicon-based / graphene nanobelt composite material prepared by the preparation method is high in specific capacity, high in initial coulombic efficiency, long in cycle life and high in rate capability, and can be applied to a lithium ion battery with high specific energy.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries for chemical power sources, and more specifically relates to a pre-lithiated high-capacity and high-cycle-efficiency silicon-based / graphene nanoribbon composite material 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 in current commercial power batteries, the energy density of batteries is low, which limits the cruising range of electric vehicles. In particular, the theoretical specific capacity of graphite anode for lithium-ion batteries is only 372mAh / g, which greatly limits the energy density of the battery. Therefore, it is urgent to develop an emerging anode material to increase the energy density of the battery. [0003] Silicon anode material has obvious advantages becau...

Claims

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Application Information

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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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