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A high-performance si@sno 2 @cComposite materials and their preparation methods and applications

A composite material, high-performance technology, applied in structural parts, electrical components, battery electrodes, etc., to achieve the effects of cheap raw materials, improved electrochemical performance, and obvious cycle performance

Active Publication Date: 2021-12-10
YANCHENG INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

How to design and make use of this feature to design and prepare new silicon-based composite materials has not yet been reported.

Method used

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  • A high-performance si@sno <sub>2</sub> @cComposite materials and their preparation methods and applications
  • A high-performance si@sno <sub>2</sub> @cComposite materials and their preparation methods and applications
  • A high-performance si@sno <sub>2</sub> @cComposite materials and their preparation methods and applications

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] (1) Take 1.0 g of Si powder and treat it at 600 °C in a muffle furnace for 1 h to prepare a thermally oxidatively modified Si material; (2) The modified Si nanoparticles are dispersed in 80 mL of deionized water for 30 min, and then added Sonicate 0.08g thioglycolic acid for 10min, add 1mL concentrated hydrochloric acid for 5min, add 0.2g urea for 5min; finally add 0.7g SnCl 2, ultrasonication for 10 min; stirring at room temperature 25°C for 40 h; suction filtration after the reaction, washing twice with water and once with ethanol. Vacuum drying at 70°C for 2h to obtain Si@SnO 2 Structural material; (3) Mix 100mL (28.6mL of deionized water and 71.4mL of ethanol) in an aqueous solution, and stir it evenly by ultrasonic. Then 0.2g Si@SnO obtained by the above steps 2 Disperse in it and stir ultrasonically for 20min; add 1.2gCTAB, 0.175g resorcinol, and 0.3mL ammonia water to the above solution, and ultrasonically stir for 30min; then place it in an oil bath at 45°C an...

Embodiment 2

[0044] (1) Get 1.0g of Si powder and treat it with hydrogen peroxide-sulfuric acid mixed solution for 1h to prepare chemical oxidation modified Si material;

[0045] (2) The modified Si nanoparticles were dispersed in 80 mL of deionized water for 30 min, then 0.035 g of thioglycolic acid was added for 10 min, 0.2 mL of concentrated hydrochloric acid was added for 5 min, and 0.1 g of urea was added for 5 min; finally, 0.2 g SnCl 2 , sonicated for 10min; stirred at 20°C for 72h. After the reaction, filter with suction, wash twice with water and once with ethanol; dry in vacuum at 70°C for 2h to obtain Si@SnO 2 Structural materials;

[0046] (3) Mix 100mL (10mL of deionized water and 90mL of ethanol) in an aqueous solution, and ultrasonically stir it evenly; then 0.2g of Si@SnO obtained in the above steps 2 Disperse in it and stir ultrasonically for 20 minutes; add 0.3g CTAB, 0.0875g resorcinol, and 0.1mL ammonia water into the above solution, and stir ultrasonically for 30 mi...

Embodiment 3

[0050] (1) Take 1.0g of Si powder and treat it with PVP solution for 1h to prepare surfactant-modified Si material;

[0051] (2) The modified Si nanoparticles were dispersed in 80 mL of deionized water and sonicated for 30 minutes, then 0.15 g of thioglycolic acid was added for 10 minutes of sonication, 2 mL of concentrated hydrochloric acid was added for 5 minutes of sonication, and 0.5 g of urea was added for 5 minutes of sonication. Finally add 1.0gSnCl 2 , ultrasonication for 10 min; stirring at 60°C for 0.5 h; suction filtration after the reaction, washing twice with water and once with ethanol. Vacuum drying at 70°C for 2h to obtain Si@SnO 2 Structural materials;

[0052] (3) Mix 100 mL (50 mL of deionized water and 50 mL of ethanol) in an aqueous solution, and stir it evenly by ultrasonic. Then 0.2g Si@SnO obtained by the above steps 2 Disperse in it and stir ultrasonically for 20min; add 3.6g CTAB, 0.7g resorcinol, and 1.2mL ammonia water into the above solution, a...

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Abstract

The invention discloses a high-performance Si@SnO 2 @C composite material and its preparation method and application, first introduce functional groups on the surface of high-capacity nano-silicon through surface modification, and then deposit a uniform layer of SnO in situ 2 layer, and then introduce a homogeneous carbon layer precursor through in-situ polymerization of phenolic resin, and prepare a composite material with a high-performance multilayer core-shell structure through high-temperature calcination; the invention also discloses a high-performance Si@SnO 2 @C Composite materials and their applications. According to the characteristics that the volume effect is easy to occur in the charge-discharge cycle of the lithium battery Si negative electrode material, the present invention effectively improves the electrochemical performance of the electrode material by coating the double coating layer on the outside of the middle layer of the active material; at the same time, the layer SnO 2 The role of the layer is not limited to the inert coating medium, it can also be used as a lithium storage material at a wider potential of 0.01-3V, SnO 2 The volume effect also occurs in the layer, which can provide sufficient buffer space for silicon, which has a more significant volume effect. Such a design structure is beneficial to prolong the cycle performance of silicon-based materials and improve the reversible capacity.

Description

technical field [0001] The invention relates to the technical field of silicon-based negative electrode materials for lithium-ion batteries, in particular to a high-performance Si@SnO 2 @C Composite materials and their preparation methods and applications. Background technique [0002] Lithium-ion batteries have the advantages of high open-circuit voltage, high energy density, long service life, no memory effect, less pollution, and low self-discharge rate. Its overall performance is superior to other traditional secondary batteries, and it is unanimously considered as a variety of portable batteries. The most ideal power supply for electronic equipment and electric vehicles. Although graphite, the negative electrode material of traditional lithium-ion batteries, has good cycle stability and high cost performance, due to its low charge-discharge specific capacity and no advantage in volume specific capacity, it is difficult to meet the high requirements of power systems, es...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/48H01M4/62H01M10/054
CPCY02E60/10
Inventor 岳鹿张文惠蒲旭清沈超关荣锋徐琪张婷婷杨勇
Owner YANCHENG INST OF TECH
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