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Silicon@carbon-graphene-based flexible composite material and preparation method thereof and lithium battery

A composite material and vinyl flexible technology, applied in the direction of battery electrodes, secondary batteries, non-aqueous electrolyte battery electrodes, etc., can solve problems such as stress concentration, limited bonding strength, and material separation from each other, so as to alleviate volume expansion and contraction, The effect of improving electronic conductivity and excellent electrochemical performance

Active Publication Date: 2018-11-13
四川天诺聚能新能源开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Conventional lithium-ion batteries generally adopt a coating process, and the active materials and the active materials and the current collector are bonded by a binder. The bonding strength is limited, and the repeated deformation process is easy to cause the materials to separate from each other; (4) battery shape
Traditional lithium-ion batteries are generally in simple shapes such as cylinders or squares, and the internal battery pole pieces are assembled by stacking or winding, which easily leads to stress concentration and damage during the deformation process

Method used

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  • Silicon@carbon-graphene-based flexible composite material and preparation method thereof and lithium battery
  • Silicon@carbon-graphene-based flexible composite material and preparation method thereof and lithium battery
  • Silicon@carbon-graphene-based flexible composite material and preparation method thereof and lithium battery

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preparation example Construction

[0046] Another aspect of the present invention provides a method for preparing a silicon@carbon-graphene-based flexible composite material. In an exemplary embodiment of the method for preparing a silicon@carbon-graphene-based flexible composite material of the present invention, the Shown preparation methods may include:

[0047] S01, modify the surface of silicon particles to realize the electrostatic self-assembly of silicon particles and graphene oxide.

[0048] In this example, first, an oxidizing solution is prepared. Then add the silicon particles into the prepared oxidizing solution, wash and dry to obtain the dried silicon particles. adding the dried silicon particles into deionized water to form a solution, adding polydiallyldimethylammonium chloride (PDDA), stirring, and drying to obtain modified silicon particles. Finally, after the modified silicon particles are mixed with graphene oxide to form a uniform solution, the pH value of the solution is adjusted to obt...

example 1

[0067] (1) the concentrated sulfuric acid (H 2 SO 4 ) and hydrogen peroxide (H 2 o 2 ) according to the volume ratio of 3:1 to form a 20ml mixed solution, then add 1g of silicon particles in an 80°C water bath for 6h, wash and dry. Then it was dissolved in deionized water and 2ml of polydiallyldimethylammonium chloride (PDDA) was added, stirred ultrasonically for 24h, and dried by centrifugation. Then the modified silicon powder and graphene oxide were mixed to form a homogeneous solution according to the modified silicon accounted for 40% of the mass of graphene oxide, and the pH was adjusted to 4 with 2mg / mL sodium hydroxide (NaOH) solution.

[0068] (2) The mixed solution of silicon particles (Si, nano-silica powder) and graphene oxide (GO) mixed uniformly was pumped into a film per 10ml, and then put into a freeze-drying agent to dry at -50°C.

[0069] (3) The composite membrane obtained in step (2) was put into a tube furnace, and kept at 500 °C for 5 h under an inert...

example 2

[0071] (1) the concentrated sulfuric acid (H 2 SO 4 ) and hydrogen peroxide (H 2 o 2 ) according to the volume ratio of 3:1 to form a 20ml mixed solution, then add 1g of silicon particles in a 75°C water bath for 5h, wash and dry. Then it was dissolved in deionized water and 2ml of polydiallyldimethylammonium chloride (PDDA) was added, stirred ultrasonically for 24h, and dried by centrifugation. Then the modified silicon powder and graphene oxide were mixed according to the modified silicon accounted for 30% of the mass of graphene oxide to form a homogeneous solution and adjusted to PH=6 with 1.6mg / mL sodium hydroxide (NaOH) solution.

[0072] (2) The uniformly mixed Si and GO mixed solution was pumped into a film every 8ml, and then dried in a freeze-drying agent at -46°C.

[0073] (3) The composite membrane obtained in step (2) was put into a tube furnace, and kept at 460 °C for 5 h under an inert gas atmosphere, and finally a composite membrane structure of C@Si / rGO wa...

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Abstract

The invention provides a silicon@carbon-graphene-based flexible composite material and a preparation method thereof and a lithium battery. The flexible composite material is prepared from graphene nanosheets and silicon@carbon particles inlaid in the graphene nanosheets, wherein the graphene nanosheets are irregularly arranged and served as a basic skeleton of the flexible composite material; thesilicon@carbon particles take a silicon particle as a core and comprise a double-carbon layer coating the surface of the silicon particle. The method comprises the following steps: adding silicon intoa solution with oxidability, washing and drying; then adding polydiallyl dimethyl ammonium chloride, stirring and drying; mixing with graphene oxide, and regulating pH; performing suction filtrationto form a film; performing freeze drying on the film; sintering to obtain the flexible composite material. With the double-carbon layer structure on the silicon surface, the flexible composite material provided by the invention can remarkably relieve the volume expansion and contraction of silicon in a cyclic process, and thus improves the electronic conductivity of the silicon particle; moreover,bending of the material can be realized, and the flexible composite material has excellent electrochemical performance.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and more specifically relates to a silicon@carbon-graphene-based flexible composite material and a preparation method thereof, a negative electrode of a lithium-ion battery and a lithium-ion battery. Background technique [0002] In order to meet the growing demand for miniaturization and diversity of electronic products, flexible and wearable portable electronic products will become the trend of future development. In recent years, the advent of rollable display screens and the concept of flexible electronic products such as electronic shirts and roll-up mobile phones have not only aroused great interest and expectations of consumers, but also aroused researchers' interest in flexible electronic technology. Research boom. Flexible electronic technology is about to bring a new round of electronic technology revolution, and will have a revolutionary impact on social life style and h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/36H01M4/38H01M4/62H01M10/0525
CPCH01M4/13H01M4/364H01M4/366H01M4/38H01M4/386H01M4/625H01M10/0525Y02E60/10
Inventor 王明珊白永顺李星
Owner 四川天诺聚能新能源开发有限公司
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