Three-dimensional composite material formed by filling carbon-encapsulated tin granules into graphene interlaminations and by filling graphene layers with carbon-encapsulated tin granules and preparation method for three-dimensional composite material

A graphene layer and composite material technology, applied in electrical components, electrochemical generators, battery electrodes, etc., can solve problems such as difficult preparation, and achieve the effects of strong controllability, high specific capacity, and excellent rate performance

Inactive Publication Date: 2015-12-16
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are two main approaches to the traditional graphene sandwich structure: one is to use the stacking between the sheets when reducing graphene oxide, so that the active metal particles are sandwiched in the graphene sheets, so as to obtain graphene-active metal-graphite The sandwich structure of ene; the second is to make t

Method used

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  • Three-dimensional composite material formed by filling carbon-encapsulated tin granules into graphene interlaminations and by filling graphene layers with carbon-encapsulated tin granules and preparation method for three-dimensional composite material
  • Three-dimensional composite material formed by filling carbon-encapsulated tin granules into graphene interlaminations and by filling graphene layers with carbon-encapsulated tin granules and preparation method for three-dimensional composite material
  • Three-dimensional composite material formed by filling carbon-encapsulated tin granules into graphene interlaminations and by filling graphene layers with carbon-encapsulated tin granules and preparation method for three-dimensional composite material

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Weigh 2.5g citric acid, 0.384g stannous chloride and 9.8gNaCl, dissolve the mixture in 50ml of deionized water, stir and dissolve to form a solution with a magnetic stirrer with a stirring speed of 300r / min, and then use a power of 400W Ultrasound for 15min, mix well. Put the mixed solution in the refrigerator to freeze overnight, and then place it in a freeze dryer to dry under vacuum at -50°C until the mixture is dried. Grind the mixture, take 10g and place it in the ark, put the ark into the tube furnace, pass through 200ml / min Ar inert gas for 10min to remove the air, then use 200ml / min Ar inert gas, and heat up at 10°C / min The temperature was raised to a temperature of 400° C., and the temperature was kept for 1 hour for carbonization reaction. After the reaction was completed, it was cooled to room temperature under the protection of an Ar atmosphere to obtain a calcined product A. Collect the calcined product A, grind it finely, wash with water until there is no...

Embodiment 2

[0028]Weigh 2.5g of citric acid, 0.576g of stannous chloride and 14.7g of NaCl, dissolve the mixture in 50ml of deionized water, stir and dissolve to form a solution with a magnetic stirrer with a stirring speed of 300r / min, and then use a power of 400W Ultrasound for 15min, mix well. Put the mixed solution in the refrigerator to freeze overnight, and then place it in a freeze dryer to dry under vacuum at -50°C until the mixture is dried. Grind the mixture, take 10g of the mixed powder and place it in the ark, put the ark into the tube furnace, pass through the Ar inert gas of 200ml / min for 10min to remove the air, and then use the Ar inert gas of 200ml / min at 10℃ / min The temperature was raised to 400°C at a heating rate of 1 min, and the carbonization reaction was carried out at a temperature of 1 h. After the reaction was completed, it was cooled to room temperature under the protection of an Ar atmosphere, and the calcined product A was obtained. Collect the calcined produ...

Embodiment 3

[0030] Weigh 2.5g citric acid, 0.576g stannous chloride and 29.4gNaCl, dissolve the mixture in 50ml of deionized water, stir and dissolve to form a solution with a magnetic stirrer with a stirring speed of 300r / min, and then use a power of 400W Ultrasound for 15min, mix well. Put the mixed solution in the refrigerator to freeze overnight, and then place it in a freeze dryer to dry under vacuum at -50°C until the mixture is dried. Grind the mixture, take 10g of the mixed powder and place it in the ark, put the ark into the tube furnace, pass through the Ar inert gas of 200ml / min for 10min to remove the air, and then use the Ar inert gas of 200ml / min at 10℃ / min The temperature was raised to 300°C at a heating rate of 1 min, and the carbonization reaction was carried out at a heat preservation time of 2 hours. After the reaction was completed, it was cooled to room temperature under the protection of an Ar atmosphere to obtain the calcined product A. Collect the calcined product...

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Abstract

The invention discloses a three-dimensional composite material formed by filling graphene layers with carbon-encapsulated tin granules and a preparation method for the three-dimensional composite material. The material is formed by uniformly filling the graphene layers with the carbon-encapsulated tin granules to form a three-dimensional sandwich-shaped structure; the preparation process is as follows: taking NaCl as a dispersing agent and a template, fully dissolving and mixing the NaCl with a metal source and a carbon source, freezing, drying and porphyrizing to obtain a mixture; putting the mixture into a tube furnace, and calcining under the argon protection to obtain a calcined product; and washing the calcined product, then mixing with glucosum anhydricum for hydrothermal cladding, and catalyzing the hydrothermal product by hydrogen and calcining to obtain the three-dimensional composite material formedby filling the graphene layers with the carbon-encapsulated tin granules. The advantages of the three-dimensional composite material and the preparation method are that: the preparation process is safe and harmless, and simple in operation; the prepared three-dimensional composite material formed by filling the graphene layers with the carbon-encapsulated tin granules is high in reversible capacity, high in cycling stability, and excellent in rate capacity when the three-dimensional composite material is used as the cathode material of lithium ion batteries.

Description

technical field [0001] The invention relates to a composite material of carbon-coated tin particles filled between three-dimensional graphene layers and a preparation method thereof, belonging to the field of lithium-ion secondary battery electrode materials. Background technique [0002] Traditional coal, oil and other fuels have always been the main energy sources for human beings. However, with their massive consumption, they not only caused an energy crisis, but also seriously polluted the air. The ever-increasing smog reminds people that it is imminent to find new clean and renewable energy sources. . In recent years, as new energy sources, water energy, wind energy, solar energy, batteries, capacitors and other industries have developed rapidly. Among them, lithium-ion secondary batteries have received widespread attention due to their advantages such as high energy density, wide operating range, high discharge voltage, no environmental pollution, and no memory effect...

Claims

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Application Information

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IPC IPC(8): H01M4/583H01M4/62H01M4/38H01M4/133H01M4/134H01M10/0525
CPCH01M4/133H01M4/134H01M4/387H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 何春年秦戬赵乃勤师春生刘恩佐李家俊
Owner TIANJIN UNIV
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