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Graphene macroscopic body/tin oxide composite lithium ion battery anode material and process thereof

A graphene macro-body, ion battery technology, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as limited improvement, no buffer structure tin dioxide, etc., to improve cycle performance, facilitate transmission, and have The effect of facilitating the transmission of electrons

Active Publication Date: 2011-11-16
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Some other studies on graphene and tin dioxide composite materials also prepared tin dioxide particles attached to graphene sheets. Although the capacity and cycle performance of the material can be improved to a certain extent, the degree of improvement is limited. Form an ideal buffer structure to accommodate the volume expansion of tin dioxide during charge and discharge

Method used

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  • Graphene macroscopic body/tin oxide composite lithium ion battery anode material and process thereof
  • Graphene macroscopic body/tin oxide composite lithium ion battery anode material and process thereof
  • Graphene macroscopic body/tin oxide composite lithium ion battery anode material and process thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0020] Take 18 mL of deionized water and add it to the beaker, add 2 mL of hydrochloric acid with a mass fraction of 37%, and then add 4.3 g of SnCl 2 2H 2 O was added to the beaker and stirred evenly to dissolve it all. Take 42 mg of the three-dimensional porous graphene macroscopic body and soak it in the solution. The measured pH value of the solution is 2-3, and the mouth of the beaker is sealed. After standing still for 24 hours, put the three-dimensional porous graphene macrobody adsorbed with tin salt into a vacuum oven at 70°C for 24 hours and dry it for 24 hours. After taking it out, put it into a tube furnace. Under the protection of argon, heat treatment is carried out, and the temperature is raised to 400°C at a heating rate of 5°C / min, then the temperature is kept at a constant temperature for 4 hours, and cooled to room temperature. The obtained material is the electrode material of the present invention. Coulombic efficiency reaches 99%.

[0021] like figure...

Embodiment 2

[0024] Take 20ml of deionized water and add it to the beaker, add 800mg of citric acid, then add 4.3g of SnCl 2 2H 2 O was added to the beaker and stirred evenly to dissolve it all. Take 42 mg of the three-dimensional porous graphene macroscopic body and soak it in the solution. The measured pH value of the solution is 2-3, and the mouth of the beaker is sealed. After standing still for 48 hours, put the macroscopic body adsorbed with tin salt into a 70°C vacuum drying oven for 24 hours, take it out, put it into a tube furnace, and pass it into argon gas after vacuuming, under the protection of argon gas Carry out heat treatment, raise the temperature to 500°C at a heating rate of 5°C / min, then keep the temperature for 4 hours, and cool to room temperature. The obtained material is the electrode material of the present invention, and its lithium storage reversible capacity reaches 1200mAh / g. 99%.

Embodiment 3

[0026] Get 18ml deionized water and join in the beaker, add the hydrochloric acid of 2ml mass fraction 37%, then 4.3g SnCl 2 2H 2 O was added to the beaker and stirred evenly to dissolve it all. Take 42 mg of the three-dimensional porous graphene macroscopic body and soak it in the solution. The measured pH value of the solution is 2-3, and the mouth of the beaker is sealed. After standing still for 24 hours, the obtained material was taken out from the solution, and freeze-dried at a temperature of -57°C for 24 hours. After taking it out, it was placed in a tube furnace, and argon or nitrogen was introduced after vacuuming. Heat treatment under protection, raise the temperature to 400°C at a heating rate of 5°C / min, then keep the temperature for 4 hours, and cool to room temperature. The obtained material is the electrode material of the present invention. The lithium storage reversible capacity reaches 1050mAh / g. Reached 99.2%.

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Abstract

The invention relates to a graphene macroscopic body / a tin oxide composite lithium ion battery anode material and a process thereof. The anode material consists of a three-dimensional graphene macroscopic body and nano tin dioxide which grows in a pore of the three-dimensional graphene macroscopic body in an orientated way; and a volume is 500 to 2,000 mAh / g; the coulomb efficiency is 80 to 99.5 percent, wherein a mass ratio of the three-dimensional graphene macroscopic body to the tin dioxide is 1:(0.1-20). The characteristic of high electric conductivity of graphene is kept, the transfer and transport of charges are facilitated, and microscopic and macroscopic electric network structures are formed; meanwhile, the three-dimensional graphene macroscopic body has a big specific surface area and abundant pore spaces, so that the transfer of lithium ions is facilitated, and the contact area of the electrode material and electrolyte is enlarged; and the preparation process is environment-friendly, pollution-free and suitable for industrial production.

Description

technical field [0001] The invention belongs to the technical field of electrode materials, and in particular relates to a graphene macrobody / tin oxide composite lithium-ion battery negative electrode material and a preparation process thereof. Background technique [0002] Due to its high energy density and good cycle performance, lithium-ion batteries have been widely used since their commercialization, gradually replacing traditional chemical power sources such as lead-acid batteries. Especially with the increasingly prominent energy and environmental issues, the new energy industry has received more and more attention. The hybrid electric vehicle and electric vehicle industries are developing rapidly, and lithium-ion batteries are widely used as an important energy storage device. The negative electrode of lithium-ion battery is an important part of the battery, and its structure and performance directly affect the capacity and cycle performance of lithium-ion batteries...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/1393
CPCY02E60/122Y02E60/12Y02E60/10
Inventor 杨全红张辰陶莹魏伟吕伟李宝华何艳兵康飞宇杜鸿达
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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