In-situ solid-phase synthesis method of silicon-graphene spheroidal composite material with multilevel structure and application thereof

A composite material, solid-phase synthesis technology, applied in structural parts, sustainable manufacturing/processing, electrical components, etc., can solve the problems of poor electronic conductivity of silicon anode and volume effect, and achieve ultra-light and thin, high reversible capacity, electrical Excellent chemical properties

Inactive Publication Date: 2015-09-23
SUZHOU GREEN POWER TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This technology is mainly aimed at bottlenecks such as the poor electronic conductivity of the silicon negative electrode and the severe volume effect in the cycle process. Through technological innovation, a new type of silicon-graphene spherical composite negative electrode material with excellent rate and cycle performance is prepared, and the corresponding positive electrode material is passed through Reasonable method to assemble into high energy density full battery

Method used

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  • In-situ solid-phase synthesis method of silicon-graphene spheroidal composite material with multilevel structure and application thereof
  • In-situ solid-phase synthesis method of silicon-graphene spheroidal composite material with multilevel structure and application thereof
  • In-situ solid-phase synthesis method of silicon-graphene spheroidal composite material with multilevel structure and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1) First weigh 10 g of silicon nanoparticles (with a particle size of 100 nm), then weigh 0.1 g of glucose and 0.1 g of ferric nitrate, and grind the mixture of the three until uniformly dispersed;

[0039] (2) Disperse the above mixture evenly in a crucible or a porcelain boat, and place it in the center of a closed tube furnace. The reaction is carried out in a mixed gas of argon and hydrogen, and the temperature is controlled to rise to 600 °C, and the temperature is kept constant for 1 hour;

[0040] (3) Cool to room temperature in a mixed gas of argon and hydrogen, wash the product three times with nitric acid, centrifuge to obtain the final product, and dry it in vacuum at 60 °C;

[0041] (4) Weigh 10 g of silicon-graphene spherical composite material, add it to the water solvent containing 0.1 g of binder polyacrylic acid, mix and stir, and mill twice with zirconium beads to make a uniform slurry, with a thickness of 9 microns The copper foil is used as a curren...

Embodiment 2

[0045] (1) First weigh 20 g of silicon nanoparticles (with a particle size of 500 nm), then weigh 1 g of sucrose and 0.2 g of nickel nitrate, and grind the mixture of the three until uniformly dispersed;

[0046] (2) Disperse the above mixture evenly in a crucible or a porcelain boat, and place it in the center of a closed tube furnace. The reaction is carried out in a mixed gas of argon and hydrogen, and the temperature is controlled to rise to 800 °C and kept at a constant temperature for 4 hours;

[0047] (3) Cool to room temperature in a mixed gas of argon and hydrogen, wash the product three times with nitric acid, centrifuge to obtain the final product, and dry it in vacuum at 60 °C;

[0048] (4) Weigh 10 g of silicon-graphene spherical composite material, add it into the water solvent containing 0.5 g of binder sodium carboxymethyl cellulose, mix and stir, and mill twice with zirconium beads to make a uniform slurry. Copper foil with a thickness of 9 microns is used as ...

Embodiment 3

[0052] (1) First weigh 50 g of silicon nanoparticles (with a particle size of 800 nm), then weigh 0.5 g of polymethyl methacrylate and 0.25 g of cobalt acetate, and grind the mixture of the three until uniformly dispersed;

[0053] (2) Disperse the above mixture evenly in a crucible or a porcelain boat, and place it in the center of a closed tube furnace. The reaction is carried out in a mixed gas of argon and hydrogen, and the temperature is controlled to rise to 1000 ℃, and the temperature is kept constant for 6 hours;

[0054] (3) Cool to room temperature in a mixed gas of argon and hydrogen, wash the product three times with nitric acid, centrifuge to obtain the final product, and dry it in vacuum at 60 °C;

[0055] (4) Weigh 30 g of the silicon-graphene spherical composite material, add it into the water solvent containing 3 g of the binder styrene-butadiene rubber, mix and stir, and mill twice with zirconium beads to make a uniform slurry. Thick copper foil is used as a ...

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Abstract

The invention brings forward a novel low-cost in-situ solid-phase preparation method. By the method, a silicon-graphene spheroidal composite material with a multilevel structure can be synthesized by one step. The composite material can be used as a high specific energy anode material to be applied in a lithium ion battery. Low-cost organic carbohydrate and inorganic transition metal salt which are respectively used as a carbon source and a metal catalyst precursor are selected to be uniformly mixed with a silicon nano-material; by a tube furnace heating method, in-situ catalytic growth of a graphene coated network happens on the surface of silicon nano-particles; and through the bridging effect of the graphene network, spheroidal micro-scale particles with a nanometer fine structure is self-assembled. The silicon-graphene spheroidal composite anode material with the multilevel structure has an advantage of high specific capacity. In addition, two main bottleneck problems such as poor electronic conductivity of a silicon anode material and severe volume effect during the cyclic process can be overcome simultaneously, and multiplying power and cycle performance of silicon anode can be raised greatly.

Description

technical field [0001] The invention belongs to the field of new energy materials and energy electrochemistry research, and specifically relates to the in-situ solid-phase synthesis of a silicon-graphene spherical composite material with a multi-level structure and its application in lithium ion full batteries as a high specific capacity negative electrode material Methods. Background technique [0002] Due to the advantages of high energy density, lithium-ion batteries have been developed rapidly in the past 20 years, and are widely used as power sources for portable electronic products such as mobile phones, cameras, and notebook computers. In recent years, the development of hybrid electric vehicles, plug-in hybrid electric vehicles, and large-scale energy storage devices has put forward higher requirements for the next-generation lithium-ion batteries in terms of energy density, rate performance, and cycle life. At present, the theoretical capacity of common graphite an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M10/058
CPCY02E60/10Y02P70/50
Inventor 王海波吴曲勇
Owner SUZHOU GREEN POWER TECH CO LTD
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