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A kind of preparation method of three-dimensional graphene tin oxide carbon composite negative electrode material

A technology of tin oxide and negative electrode material, applied in the field of synthesis of inorganic functional materials, can solve problems such as not being well solved, and achieve the effects of high repetition rate, high rate performance and cycle stability, and simple preparation method

Active Publication Date: 2021-02-02
HENAN NORMAL UNIV
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  • Application Information

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Problems solved by technology

In addition to controlling the performance, element doping is also a very common method, such as the composite of graphene and tin oxide, and the composite of tin oxide and titanium oxide. However, this issue has not been discussed in previous research work. not well resolved

Method used

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  • A kind of preparation method of three-dimensional graphene tin oxide carbon composite negative electrode material
  • A kind of preparation method of three-dimensional graphene tin oxide carbon composite negative electrode material
  • A kind of preparation method of three-dimensional graphene tin oxide carbon composite negative electrode material

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Embodiment

[0019] Graphene oxide (20 mg mL) was prepared by a modified classical Hummer's method -1 ). Graphene oxide was prepared by the modified classical Hummer's method: take a 250mL round bottom flask, weigh 46mL concentrated sulfuric acid and add 0.1g KNO 3 , introducing NO in the process 3 - ions, to a certain extent, enhance the strong oxidizing property of concentrated acid. After stirring for 10 min to be completely dissolved, weigh 2 g of graphite, slowly add it to the flask under stirring conditions, and use it for about 1 h. After the end, continue stirring for 10 min to ensure more complete exfoliation of graphite in concentrated sulfuric acid. Weigh 6g of potassium permanganate and slowly add it to the flask with stirring in the ice bath. It takes about 1 hour. During the process of adding potassium permanganate, heat will be released. Continue stirring for 2 h under ice-water bath conditions, so that the graphite is more completely exfoliated and oxidized in the stron...

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Abstract

The invention discloses a preparation method of a three-dimensional graphene tin oxide carbon composite negative electrode material, and belongs to the technical field of synthesis of an inorganic functional material. According to the key technical points of the invention, the three-dimensional graphene tin oxide carbon composite negative electrode material is prepared by the steps of uniformly loading tin oxide nanocrystals with uniform dimensions in a three-dimensional graphene net structure, and performing further nitrogen doping and carbon coating by taking dopamine hydrochloride as a nitrogen source and a carbon source. By virtue of the preparation method, volume expansion of tin oxide in alloying and dealloying processes is relieved effectively, and stability of the lithium ion battery negative electrode material can be reinforced.

Description

technical field [0001] The invention belongs to the technical field of synthesis of inorganic functional materials, and in particular relates to a preparation method of a three-dimensional graphene tin oxide carbon composite negative electrode material. Background technique [0002] Lithium-ion batteries with high energy density and good cycle performance are widely used in portable electronic devices and energy storage devices. Although carbon-based anode materials have been put into large-scale applications, their low theoretical specific capacity severely limits lithium-ion batteries. industrialization. Graphene has been used as a negative electrode material for lithium-ion batteries for 20 years, since the theoretical capacity of graphene is 372mAh h -1 , and the performance is poor in the case of high-rate charge and discharge. Due to its low cost, environmental protection and high theoretical specific capacity, SnO 2 become a more promising alternative material. Mo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/583H01M4/62H01M4/48H01M10/0525C01B32/182
CPCC01B32/182H01M4/362H01M4/48H01M4/583H01M4/62H01M10/0525Y02E60/10
Inventor 武大鹏任好雨杨东晓王红菊徐芳高志永蒋凯
Owner HENAN NORMAL UNIV
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