Method of preparing stannic oxide/graphene composite lithium ion battery anode material under the assistance of chitosan oligosaccharide self-assembly

A graphene composite and lithium-ion battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of harsh reaction conditions, polluted environment, energy consumption, unfavorable environmental protection, etc. Low power consumption, environment-friendly effect

Active Publication Date: 2014-08-13
WUHAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, the Chinese invention patent application whose application number is CN201310025748.2 discloses a method of a tin dioxide/graphene composite lithium ion battery negative electrode material, which makes stannous chloride and graphene oxide react with choline chloride and ethyl The reaction is carried out in a non-aqueous solution composed of diols, which requires a large amount of organic solvents, which is not conducive to environmental protection and increases costs
For example, the Chinese invention patent application with the application number CN201110159043.0 discloses a graphene macroscopic body/tin oxide composite lithium-ion battery negative electrode ma

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  • Method of preparing stannic oxide/graphene composite lithium ion battery anode material under the assistance of chitosan oligosaccharide self-assembly
  • Method of preparing stannic oxide/graphene composite lithium ion battery anode material under the assistance of chitosan oligosaccharide self-assembly

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Example Embodiment

[0021] Example 1

[0022] 3 g of sodium stannate was dissolved in 80 ml of deionized water, 5 g of chitosan oligosaccharide (degree of polymerization 6, degree of deacetylation 60%) was added, mixed and stirred to obtain a nano-tin dioxide self-assembly precursor modified by chitosan oligosaccharide. 0.045 g of graphene oxide powder was added to the precursor to obtain a mixed solution, which was then stirred at 20° C. for 20 hours to carry out the mixing reaction. The obtained product is put into a centrifuge for separation, and the precipitate is repeatedly washed with deionized water. After washing, it is dried in a vacuum drying oven at 50 ° C for 8 hours, and the obtained solid powder is the chitosan oligosaccharide self-assembly assistant of the present invention. Preparation of tin dioxide / graphene composite lithium-ion battery anode material.

Example Embodiment

[0023] Example 2

[0024] Dissolve 1.8g of sodium stannate in 80ml of deionized water, add 2.8g of chitosan oligosaccharide (degree of polymerization 20, degree of deacetylation 95%), mix and stir to obtain a nano-tin dioxide self-assembly precursor modified by chitosan oligosaccharide. 0.085 g of graphene oxide powder was added to the precursor to obtain a mixed solution, which was then stirred at 40° C. for 10 hours to perform a mixed reaction. The obtained product is separated by filtration, and the precipitate is repeatedly washed with deionized water. After washing, it is dried in a vacuum drying oven at 30 ° C for 10 hours, and the obtained solid powder is the self-assembly of chitosan oligosaccharide. Tin / graphene composite lithium-ion battery anode material.

Example Embodiment

[0025] Example 3

[0026] Dissolve 3.5g of sodium stannate in 60ml of deionized water, add 5.5g of chitosan oligosaccharide (degree of polymerization 6, degree of deacetylation 50%), mix and stir to obtain a nano-tin dioxide self-assembly precursor modified by chitosan oligosaccharide. 0.14 g of graphene oxide powder was added to the precursor to obtain a mixed solution, which was then stirred at 60° C. for 6 hours to perform a mixed reaction. The obtained product is put into a centrifuge for separation, and the precipitate is repeatedly washed with deionized water. After washing, it is dried in a vacuum drying oven at 80 ° C for 5 hours, and the obtained solid powder is the chitosan oligosaccharide self-assembly assistant of the present invention. Preparation of tin dioxide / graphene composite lithium-ion battery anode material.

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Abstract

The invention discloses a method of preparing a stannic oxide/graphene composite lithium ion battery anode material under the assistance of chitosan oligosaccharide self-assembly. The method includes: 1) adding sodium stannate and chitosan oligosaccharide into water to form a nanometer stannic oxide self-assembly precursor modified by the chitosan oligosaccharide; 2) adding graphene oxide into the self-assembly precursor to obtain a solution mixture, and mixing and reacting at 20-60 DEG C for 6-20 h to obtain the nanometer stannic oxide/graphene oxide composite material modified by the chitosan oligosaccharide; and 3) washing to remove the chitosan oligosaccharide after solid-liquid separation, and drying to prepare the stannic oxide/graphene composite lithium ion battery anode material. The method can be performed at room temperature under normal pressure, and is free of use of organic solvent, convenient in operation, easily available in raw materials, free of pollution and prone to popularization and application. The stannic oxide/graphene composite lithium ion battery anode material prepared by the method has good electrochemical properties, can be used for preparing lithium ion battery anodes, and has wide market and application prospect.

Description

technical field [0001] The invention belongs to the technical field of materials and chemical power sources, and in particular relates to a method for preparing tin dioxide / graphene composite lithium-ion battery negative electrode materials aided by chitosan oligosaccharide self-assembly. Background technique [0002] Lithium-ion batteries have the advantages of high operating voltage, high specific energy, wide operating temperature range, and stable discharge. The current commercial lithium-ion battery negative electrode active material is mainly graphite, but its theoretical specific capacity is only 372mAh / g, which is difficult to meet the energy density and power density requirements of the power field such as electric vehicles. Tin dioxide has a higher specific capacity (790mAh / g) than graphite, is cheap and non-toxic, and is considered to be a promising electrode material for lithium-ion batteries. However, the volume of tin dioxide will change drastically during cha...

Claims

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Application Information

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IPC IPC(8): H01M4/38H01M4/48
CPCH01M4/362H01M4/48H01M4/583H01M10/0525Y02E60/10
Inventor 涂文懋熊明唐浩林
Owner WUHAN UNIV OF TECH
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