Preparation method of tin-silicon-based graphne ball negative electrode material for lithium ion battery

A lithium-ion battery, graphene ball technology, applied in battery electrodes, circuits, electrical components and other directions, can solve the problems of urgent improvement of material rate performance, poor cycle stability, coating and other problems

Active Publication Date: 2018-09-04
陕西埃普诺电力储能科技有限公司
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Problems solved by technology

[0005] Yang Quanhong's research group used graphene to coat tin dioxide nanoparticles to prepare SnO 2 Nanoparticles/graphene composite anode material (ACS Nano, 2009, 3(11): 3730-3736), exhibited good electrochemical properties, with a specific capacity as high as 840mAh/g, however, since graphene cannot completely convert SnO 2 The uniform coating of nanoparticles also results in extremely poor cycle performance of the material
In addition, since graphene and SnO 2 Nanoparticles are not in good contact, and t

Method used

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  • Preparation method of tin-silicon-based graphne ball negative electrode material for lithium ion battery

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[0027] The invention provides a method for preparing a tin-silicon-based graphene ball negative electrode material for a lithium ion battery, comprising the following steps:

[0028] (1), silicon ester monomer is dissolved in organic solvent, is prepared into mixed solution A, takes the tin dioxide ball that diameter is 10-20nm for subsequent use;

[0029] (2), uniformly mix the mixed solution A with tin dioxide balls according to the metering ratio, and then dry at 30-70°C to obtain a tin dioxide composite material coated with silicon ester monomers;

[0030] (3), putting the tin dioxide composite material coated with silicon ester monomer in step (2) into a muffle furnace for calcining, to obtain tin dioxide nanospheres coated with silicon dioxide;

[0031] (4), put the silicon dioxide-coated nano-tin dioxide nanospheres into the tubular atmosphere furnace, fill the tubular atmosphere furnace with carrier gas and carbon source gas, and use chemical vapor deposition to prepar...

Embodiment 1

[0039] A preparation method of tin-silicon-based graphene ball negative electrode material for lithium ion battery, the steps are as follows:

[0040] (1), weigh 0.048g ethyl orthosilicate (Si(OC 2 h 5 ) 4 ) was dissolved in 5 g of N-methylpyrrolidone to obtain solution A, and 1.868 g of tin dioxide balls with a diameter of 20 nm were weighed and dried in vacuum at 60° C. for later use.

[0041] (2) Add 1.868g of vacuum-dried tin dioxide balls with a diameter of 20nm into solution A, ball mill and mix for 1 hour, and dry at 50°C in a blast drying oven to obtain ethyl orthosilicate / tin dioxide composite material.

[0042] (3), then put the obtained material into a muffle furnace and bake at 200° C. for 30 minutes to obtain silicon dioxide-coated tin dioxide balls, such as figure 1 Scanning electron microscope images show that the resulting tin dioxide@silica spheres have a diameter of about 25 nm.

[0043] (4), the obtained 25nm silicon dioxide-coated tin dioxide balls are...

Embodiment 2

[0047] A preparation method of tin-silicon-based graphene ball negative electrode material for lithium ion battery, the steps are as follows:

[0048] (1) Weigh 0.032g of tetraethyl orthosilicate and dissolve it in 5g of absolute ethanol to obtain solution A, weigh 1.568g of tin dioxide balls with a diameter of 15nm and dry them in vacuum at 60°C for later use.

[0049] (2) Add 1.568g of tin dioxide balls with a diameter of 15nm after vacuum drying to solution A, and after ball milling and mixing for 0.1h, dry at 70°C in a blast drying oven to obtain ethyl orthosilicate / dioxide tin composite.

[0050] (3) Then put the obtained material into a muffle furnace and bake at 300° C. for 30 minutes to obtain silicon dioxide-coated tin dioxide balls with a diameter of about 19 nm.

[0051] (4) Put the obtained 19nm silica-coated tin dioxide ball into a tubular atmosphere furnace, use methane as the carbon source, and hydrogen / argon (hydrogen / argon = 1:1) as the carrier gas , chemica...

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Abstract

The invention discloses a preparation method of a tin-silicon-based graphene ball negative electrode material for a lithium ion battery. The preparation method comprises the following steps that (1) asilicon ester monomer is dissolved in an organic solvent and prepared to be a mixed solution A, a dry stannic oxide ball with the diameter being 15-25nm is taken for stand-by application; (2) the mixed solution A and the stannic oxide ball are uniformly mixed at the stoichiometric ratio, the mixture is dried at the temperature of 30-70 DEG C, and a stannic oxide composite material is obtained; (3) the stannic oxide composite material is roasted in a maffle furnace, and a stannic oxide nano ball wrapped with silicon dioxide is obtained; and (4) the stannic oxide nano ball is placed in a tubular atmosphere furnace, the tubular atmosphere furnace is filled with carrier gas and carbon source gas, and the tin-silicon graphene ball wrapped with graphene is prepared by utilizing chemical vapor deposition. The prepared tin-silicon graphene ball is firm, binding problem between graphene and a to-be-wrapped material is avoided, meanwhile, graphene can completely and uniformly wrap SnO2 nano particles, graphene forms a good buffer layer and an electricity conductive network to SnO2, the capacity can reach 600-1500mAh/g, and the coulombic efficiency can reach 80-98%.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a preparation method of a tin-silicon-based graphene ball negative electrode material for lithium ion batteries. Background technique [0002] As a new generation of green high-energy batteries, lithium-ion batteries have the advantages of small weight, high energy density, long cycle life, high working voltage, no memory effect, and no environmental pollution. They have been widely used in portable electronics such as mobile phones, notebook computers, and cameras. Among the equipment, it is also the preferred power source for electric vehicles and hybrid electric vehicles in the future, and has broad application prospects. [0003] Anode materials are one of the key components of lithium-ion batteries. At present, graphite anode materials account for more than 98% of the global lithium battery anode materials. However, during the charging and discharging proce...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/48H01M4/62
CPCH01M4/366H01M4/48H01M4/625Y02E60/10
Inventor 谢正伟汪沣付光辉汪岳峰
Owner 陕西埃普诺电力储能科技有限公司
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