Silicon, silicon-oxygen-carbon and graphene-based composite material, and preparation method and application thereof

A composite material and graphene-based technology, applied in the field of lithium-ion batteries, can solve the problems that hinder the large-scale application of lithium-ion battery anode materials made of silicon materials, poor electrochemical cycle stability of batteries, and loss of electrochemical activity, etc., to achieve good lithium-ion batteries. Transmission performance, improved cycle efficiency, stable performance, and improved applicability

Inactive Publication Date: 2016-04-13
CHINA AUTOMOTIVE BATTERY RES INST CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the large volume change of the silicon material during the intercalation / delithiation process, it will cause structural damage and mechanical pulverization of the silicon material, which will cause the silicon active component to lose electrical contact with the current collector and lose electrochemical activity, resulting in silicon The electrochemical cycle stability of negative electrode materials and the whole battery is poor, which seriously hinders the large-scale application of silicon materials as lithium ion battery negative electrode materials

Method used

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  • Silicon, silicon-oxygen-carbon and graphene-based composite material, and preparation method and application thereof
  • Silicon, silicon-oxygen-carbon and graphene-based composite material, and preparation method and application thereof

Examples

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Embodiment 1

[0035] This embodiment provides a silicon-silicon-oxycarbon-graphene-based composite material, and the theoretical stoichiometric formula of the composite material is Si-0.1SiO3 C 2 -46G; Among them, Si is the particle size D 50 is 100nm silicon nanoparticle, G represents graphene oxide with 12 carbon atoms; the specific surface area of ​​the graphene oxide is 300m 2 / g or so.

[0036] The present embodiment further provides a preparation method of silicon-silicon-oxycarbon-graphene-based composite material, specifically:

[0037] (1) Take the particle size D 50 5g of 100nm silicon nanoparticles, dispersed in a solution containing 5g of liquid vinyl tris (2-methoxyethoxy) silane monomer compound, after stirring for 6h, add 1mL of oxalic acid solution with a pH of 6 while stirring, And keep stirring for 24h to obtain a mixed solution;

[0038] (2) adding the mixed solution to a specific surface area of ​​300m containing 100g 2 In the graphene oxide dispersion of about / g, ...

Embodiment 2

[0042] This embodiment provides a silicon-silicon-oxycarbon-graphene-based composite material, and the theoretical stoichiometric formula of the composite material is Si-0.02SiO 3 C 2 -4.6G; where Si is the particle size D 50 is 500nm silicon nanoparticle, G represents 12 carbon atoms of carboxylic acid-terminated graphene; the specific surface of the carboxylic acid-terminated graphene is 429m 2 / g or so.

[0043] The present embodiment further provides a preparation method of silicon-silicon-oxycarbon-graphene-based composite material, specifically:

[0044] (1) Take the particle size D 50 50g of 500nm silicon nanoparticles, dispersed in a solution containing 10g of liquid vinyl tris (2-methoxyethoxy) silane monomer compound, after stirring for 2h, add 1mL of oxalic acid solution with a pH of 6 while stirring, And keep stirring for 8h to obtain a mixed solution;

[0045] (2) Add the mixed solution to a specific surface area of ​​429m containing 100g 2 In the dispersion...

Embodiment 3

[0048] This embodiment provides a silicon-silicon-oxycarbon-graphene-based composite material, and the theoretical stoichiometric formula of the composite material is Si-0.2SiO 3 C 2 -93G; wherein, Si is a silicon nanowire with a diameter of 30 nm, and G represents graphene oxide with 12 carbon atoms; the specific surface of the graphene oxide is 300 m 2 / g or so.

[0049] The present embodiment further provides a preparation method of silicon-silicon-oxycarbon-graphene-based composite material, specifically:

[0050] (1) Take 5 g of silicon nanowires with a diameter of 30 nm, disperse it in a solution containing 10 g of liquid vinyl tris(2-methoxyethoxy) silane monomer compound, stir for 6 h, add 1 mL of pH while stirring 6 of the oxalic acid solution, and kept stirring for 48h to obtain a mixed solution;

[0051] (2) Add the mixed solution to a specific surface area of ​​300m containing 200g 2 In the graphene oxide dispersion of about / g, continue to stir for 24 hours, a...

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Abstract

The invention relates to a silicon, silicon-oxygen-carbon and graphene-based composite material, which comprises a graphene-based material and a silicon nano-material, wherein the silicon nano-material is attached to the surface of the graphene-based material; and the silicon nano-material is connected with the graphene-based material through a silicon-oxygen-carbon chain structure. The invention further provides a preparation method of the composite material. The silicon-oxygen-carbon structure contained in the composite material provided by the invention can ensure that the silicon material is relatively uniformly and firmly distributed on the surface of a graphene-based material, and can still electrically contact the conductive graphene-based material in the charge-discharge process after a relatively large volume change; and the graphene-based material not only can ensure the overall conductivity of the material, but also can relieve stress of the silicon material caused by the volume change in the charge-discharge process through folds. The composite material provided by the invention is excellent in overall performance, and has the characteristics of high electrochemical cycle stability and adjustable specific capacity.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a silicon-silicon oxycarbon-graphene-based composite material that can be applied to lithium ion batteries. Background technique [0002] Due to its excellent performance advantages in energy density and cycle life, lithium-ion batteries have been widely used in various important fields such as communications, electronics, transportation, and energy storage. With the development of high and new technology and the improvement of scientific and technological level, the development of high specific energy, long life and low cost lithium-ion batteries that can be applied to electric vehicles and large-scale energy storage power stations has become an urgent problem to be solved. The positive and negative materials of the battery are the key factors that affect and determine the performance of the battery. Currently, the development and progress of the electrochemical performance...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/583H01M4/62H01M4/36H01M10/0525
CPCH01M4/366H01M4/386H01M4/583H01M4/62H01M4/625H01M10/0525Y02E60/10
Inventor 王建涛李进王耀武兆辉庞静李俊强唐玲程尧王琳卢世刚
Owner CHINA AUTOMOTIVE BATTERY RES INST CO LTD
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