Preparation method and application of a sn-snsb/carbon nanosheet composite material

A technology of composite materials and carbon nanosheets, applied in structural parts, electrical components, battery electrodes, etc., can solve problems such as large difficulties and uncontrollable growth of two-phase materials, and achieve low cost, good industrialization prospects, and improved electrochemistry. performance effect

Active Publication Date: 2022-04-05
YANCHENG INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the uncontrollable growth of two-phase materials, it is very difficult to construct uniformly distributed Sn or SnSb alloy / carbon composites in situ.

Method used

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  • Preparation method and application of a sn-snsb/carbon nanosheet composite material
  • Preparation method and application of a sn-snsb/carbon nanosheet composite material
  • Preparation method and application of a sn-snsb/carbon nanosheet composite material

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Effect test

Embodiment 1

[0028] A preparation method of Sn-SnSb / carbon nanosheet composite material, comprising the following steps:

[0029] 1) Prepare 100 mL of a mixed solution of absolute ethanol and water, and the volume ratio of water to ethanol is 9:1.

[0030] 2) Disperse 3g of urea in the above mixed solution, ultrasonically treat until completely dissolved, add 0.1g of tin antimony oxide powder particles with a diameter of about 10 nm (wherein the molar ratio of Sn:Sb is about 9 / 1) and ultrasonically After 20 minutes of treatment, add 0.3 g of glucose, and after the glucose is completely dissolved, remove the solvent by rotary evaporation, and then dry in vacuum to obtain the precursor powder;

[0031] 3) Put the above precursor powder into the tube furnace, raise the temperature to 600°C at a rate of 2°C / min under argon, keep it for two hours, and then increase the temperature to 800°C at a rate of 2°C / min, After two hours of heat preservation, the temperature was lowered to room temperatu...

Embodiment 2

[0035] A preparation method of Sn-SnSb / carbon nanosheet composite material, comprising the following steps:

[0036] 1) Prepare 150 mL of a mixed solution of absolute ethanol and water, and the volume ratio of water to ethanol is 10:1.

[0037] 2) Disperse 6 g of urea in the above mixed solution. After ultrasonic dissolution is complete, add 0.15 g of tin antimony oxide (Sn:Sb molar ratio is about 9 / 1) powder particles with a diameter of 100 nm, and ultrasonically for 20 minutes. Add 0.3 g of sucrose to ultrasonically dissolve completely, remove the solvent by rotary evaporation, and then prepare the precursor powder by vacuum drying;

[0038] 3) Put the above precursor powder into a tube furnace, raise the temperature to 600°C at a rate of 2°C / min under He gas, keep it for two hours, and then raise the temperature to 800°C at a rate of 2°C / min. After two hours of heat preservation, the temperature was lowered to room temperature, and black powder was obtained, which was the ...

Embodiment 3

[0042] A preparation method of highly dispersed Sn-SnSb / carbon nano sheet composite material, comprising the following steps:

[0043] 1) Prepare 200 mL of a mixed solution of absolute ethanol and water, and the volume ratio of water to ethanol is 19:1.

[0044] 2) Disperse 6g of cyanoamine in the above mixed solution. After ultrasonic dissolution is complete, add 0.1g of tin antimony oxide (medium, Sn:Sb molar ratio is about 9 / 1) powder particles with a diameter of 30 nm, and ultrasonically 20 Minutes later, add 0.4 g of sucrose to ultrasonically dissolve completely, remove the solvent by rotary evaporation, and then prepare the precursor powder by vacuum drying;

[0045] 3) Put the above precursor powder into the tube furnace, under Ar / H 2 Raise the temperature to 600°C at a rate of 2°C / min under the mixed gas, keep it warm for two hours, then raise it to 800°C at a rate of 2°C / min, keep it at room temperature for two hours, and obtain a black powder, which is Carbon nanoshe...

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Abstract

The invention discloses a preparation method and application of a Sn-SnSb / carbon nano sheet composite material. First, configure ethanol-water solution, and add urea or cyanoamine, tin antimony oxide, and glycogen in sequence in the ethanol-water solution, and ultrasonic dispersion is required for each addition; secondly, the above-mentioned mixed solution is rotary evaporated to dryness, and then passed After vacuum drying, grind the precursor powder, and finally transfer the precursor powder into a tube furnace, and carry out high-temperature carbonization by temperature programming under an inert atmosphere, to obtain a highly dispersed Sn-SnSb / carbon nanosheet composite material; the The weight ratio of carbon in the Sn‑SnSb / carbon nanosheet composite is 15‑60%. By designing nano-Sn and its SnSb alloys to be uniformly dispersed on the surface of conductive carbon nanosheets to form a three-dimensional structure, the electrochemical performance of electrode materials is effectively improved. The raw materials are cheap, the preparation is simple, the yield is high, and it is convenient for industrial production.

Description

technical field [0001] The invention relates to the technical field of anode materials for sodium batteries, in particular to a preparation method and application of a Sn-SnSb / carbon nanosheet composite material. Background technique [0002] Na-ion batteries have recently attracted great interest due to their low cost, abundant resources, and improved safety compared to lithium-ion batteries. However, because sodium ions have a larger ionic radius than lithium ions, resulting in lower specific capacity, lower rate capacity, and significant volume effect, the cycle life is shortened. For now, compared with lithium-ion batteries, there are still fewer electrode materials suitable for sodium-ion batteries, and the performance is not superior enough. [0003] Sodium can form alloys with various metal elements such as tin, antimony, germanium, and lead, such as Na 15 sn 4 The alloy can reach a theoretical specific capacity of 847 mAh / g, Na 3 Sb can reach 660 mAh / g theoretica...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/583H01M4/62H01M4/38H01M10/054
CPCY02E60/10
Inventor 岳鹿张文惠王旭金子纯甘磊成鑫丽关荣锋
Owner YANCHENG INST OF TECH
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