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Nitrogen-doped graphene/tin oxide nano composite material and preparation method thereof

A nitrogen-doped graphene and nanocomposite material technology, applied in structural parts, electrical components, battery electrodes, etc., can solve the problem of poor bonding between nanoparticle crystallinity and graphene, small contact area between negative electrode material and electrolyte, and negative electrode material. problems such as low electrical conductivity, to achieve the effects of controllable morphology, excellent electrochemical lithium storage performance, and good electrical conductivity

Inactive Publication Date: 2012-01-18
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] CN1885596A discloses a kind of tin-based composite oxide lithium ion battery negative electrode material, but carrier SiO 2 etc. are insulators, so the conductivity of the negative electrode material is very low, which has a great impact on performance
CN1812167A discloses a preparation method of a lithium ion battery negative electrode material of tin oxide composite graphite, but due to the small specific surface area of ​​graphite, the contact area between the negative electrode material and the electrolyte is small, which affects its charge and discharge performance under high current
However, there are still some problems as follows: the loading of tin oxide on the surface of graphene is low, rarely reaching more than 60%; the synthesis method is complicated, usually first reducing graphene oxide to graphene, and then dispersing it to a suitable Complex reaction in solvent
These processes have great damage to the graphene structure, serious agglomeration, poor crystallinity of nanoparticles and poor combination with graphene.

Method used

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  • Nitrogen-doped graphene/tin oxide nano composite material and preparation method thereof
  • Nitrogen-doped graphene/tin oxide nano composite material and preparation method thereof
  • Nitrogen-doped graphene/tin oxide nano composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Dissolve tin chloride in 80 mL, 1 mg / mL graphene oxide sol, add 2.0 mL hydrochloric acid, and stir well to make the concentration of tin chloride aqueous solution 1.0 g / L. Then, the uniformly stirred mixed colloidal solution was transferred to a 100 mL hydrothermal reaction kettle, hydrothermally reacted at 120 °C for 24 h, cooled to room temperature naturally, washed with water and ethanol several times, and dried overnight at 60 °C. The diameter of tin oxide nanocrystals in the obtained graphene nanocomposites is 10 nm to 20 nm, and the length is 100 nm to 200 nm; the loading capacity of nanocrystals on the surface of graphene is 44%. The TEM figure of the obtained product is as attached Figure 1-3 Shown; The TG-DTA of the obtained product is as attached Figure 4 shown. The as-prepared graphene / tin oxide nanocomposites were used as anode materials for lithium-ion batteries at 100 and 200 mA g -1 The capacities were maintained at 710 and 575 mAh g after 50 cycles a...

Embodiment 2

[0054] Dissolve tin chloride in 80 mL, 1 mg / mL graphene oxide sol, add urea and 2.0 mL hydrochloric acid, and stir well, so that the aqueous solutions of tin chloride and urea have concentrations of 2.5 g / L and 0.5 mol / L. Then, the uniformly stirred mixed colloidal solution was transferred to a 100 mL hydrothermal reaction kettle, hydrothermally reacted at 120 °C for 24 h, cooled to room temperature naturally, washed with water and ethanol several times, and dried overnight at 60 °C. The diameter of tin oxide nanocrystals in the obtained graphene nanocomposite material is 2 nm to 6 nm, the length is 10 nm to 30 nm, and the loading capacity of nanocrystals on the surface of graphene is 65%. The TEM figure of the obtained product is as attached Image 6 shown. XPS analysis showed that nearly 5.8% of N elements were doped into the graphene / tin oxide nanocomposites.

Embodiment 3

[0056] Dissolve tin chloride in 80 mL, 0.5 mg / mL graphene oxide sol, add urea and 2.0 mL hydrochloric acid, and stir well, so that the concentrations of tin chloride and urea in aqueous solution are 5.0 g / L and 0.5 mol / mL, respectively. L. . Then, the uniformly stirred mixed colloid solution was transferred to a 100 mL hydrothermal reaction kettle, hydrothermally reacted at 90 °C for 24 h, cooled to room temperature naturally, washed with water and ethanol several times, and dried overnight at 60 °C. The diameter of tin oxide nanocrystals in the obtained graphene nanocomposite material is 2 nm to 5 nm, the length is 10 nm to 20 nm, and the loading capacity of nanocrystals on the surface of graphene is 52.5%. The TEM figure of the obtained product is as attached Figure 7 shown. XPS analysis showed that nearly 2.8% of N elements were doped into the graphene / tin oxide nanocomposites.

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Abstract

The invention relates to a nitrogen-doped graphene / tin oxide nano composite material and a preparation method thereof. The nitrogen-doped graphene / tin oxide nano composite material comprises graphene and tin oxide nanocrystals loaded on the surface of the graphene. The doping content of the nitrogen in the composite material is 0 to 8 percent. Due to the doping effects of the nitrogen and the dispersive action of tin oxide nanoparticles in the graphene, the composite material has the characteristics of large specific area surface and high conductivity, and exhibits high electrochemical lithium storage performance.

Description

technical field [0001] The invention relates to the field of negative electrode materials for lithium ion batteries, in particular to a graphene / tin oxide nanocomposite material, especially a nitrogen-doped graphene / tin oxide nanocomposite material and a preparation method thereof. Background technique [0002] With the rapid development of the world economy, mankind is facing an increasingly severe energy crisis. As a new type of energy storage system, lithium-ion battery has great strategic significance in the field of new energy. It has been widely used in the fields of communication, information technology and national defense, and is the focus technology at the current stage. At present, the anode material of lithium-ion batteries that has been widely commercialized is graphitized carbon material, but its lithium storage capacity is low (less than 372 mAh / g), which can no longer meet the needs of new technological development. Therefore, higher storage capacity and cyc...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/38H01M4/48
CPCY02E60/12Y02E60/10
Inventor 孙静徐朝和高濂
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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