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SnO2@C material of double-wall hollow sphere structure and preparation method of SnO2@C material

A technology of hollow spheres and hollow nanometers, applied in structural parts, electrical components, battery electrodes, etc., can solve the problems of limitation, electrical conductivity, ion transmission rate multiplier performance, cycle performance impact, high volume expansion rate, etc., and achieve stable cycle performance , Increase conductivity and ion transmission rate, good conductivity

Active Publication Date: 2021-12-03
YANGZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, SnO 2 It still has the disadvantages of tin derivatives, and its volume expansion rate in the cycle reaches 300%, which greatly limits the application of lithium batteries.
[0004] Existing SnO 2 The volume expansion rate of the material in its cycle is high, and the electrical conductivity, ion transmission rate, rate performance, and cycle performance are all affected

Method used

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  • SnO2@C material of double-wall hollow sphere structure and preparation method of SnO2@C material
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  • SnO2@C material of double-wall hollow sphere structure and preparation method of SnO2@C material

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Embodiment 1

[0032] SnO with double-wall hollow sphere structure prepared by the present invention 2 @C material, with hollow mesoporous carbon spheres as outer hollow spheres, hollow tin dioxide spheres as inner hollow spheres, SnO 2 Hollow spheres inside hollow mesoporous carbon spheres, SnO 2 The diameter of the hollow sphere is 180-320nm, and there is a gap to a certain extent between the hollow mesoporous carbon sphere.

[0033] SnO with double-walled hollow sphere structure 2 @C material preparation steps include: (1) Add 50mL of absolute ethanol, 5mL of deionized water, and 1mL of ammonia water into a beaker in sequence and perform magnetic stirring, and at the same time, add 0.4mL tetraethyl orthosilicate to the above mixed solution, and The mixed solution was stirred for a period of time, 0.2 g of resorcinol and 0.2 g of formaldehyde were weighed and sequentially added to the above mixed solution, and magnetically stirred at a water bath temperature of 30° C. for 24 hours. Afte...

Embodiment 2

[0040] SnO with double-walled hollow sphere structure 2 @C material preparation steps include: (1) Add 50mL of absolute ethanol, 5mL of deionized water, and 1mL of ammonia water into a beaker in sequence and perform magnetic stirring, and at the same time, add 0.4mL tetraethyl orthosilicate to the above mixed solution, and The mixed solution was stirred for a period of time, 0.2 g of resorcinol and 0.2 g of formaldehyde were weighed and added to the above mixed solution in sequence, and magnetically stirred at a water bath temperature of 30° C. for 24 hours. After the reaction is completed, it is centrifuged and washed to obtain a solid phase and then dried. Under the protection of argon, the dried product is calcined at a high temperature of 600°C for 5 hours at a heating rate of 2°C / min;

[0041] Then the product calcined at high temperature was etched with 0.35 M sodium hydroxide solution for 5 hours under the condition of 50° C. water bath. Finally, the etched product was...

Embodiment 3

[0049] SnO with double-walled hollow sphere structure 2 @C material preparation steps include: (1) Add 50mL of absolute ethanol, 5mL of deionized water, and 1mL of ammonia water into a beaker in sequence and perform magnetic stirring, and at the same time, add 0.4mL tetraethyl orthosilicate to the above mixed solution, and The mixed solution was stirred for a period of time, 0.2 g of resorcinol and 0.2 g of formaldehyde were weighed and added to the above mixed solution in sequence, and magnetically stirred at a water bath temperature of 30° C. for 24 hours. After the reaction was completed, it was centrifuged and washed to obtain a solid phase and then dried. The dried product was calcined at 600° C. for 5 hours at a heating rate of 2° C. / min under the protection of argon.

[0050] Then the product calcined at high temperature was etched with 0.5M sodium hydroxide solution for 5 hours in a water bath at 50°C; finally, the etched product was centrifuged and washed, and the obt...

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Abstract

The invention discloses a SnO2@C material of a double-wall hollow sphere structure and a preparation method of the SnO2@C material. The SnO2@C material is composed of an inner hollow sphere and an outer spherical shell wrapping the inner hollow sphere, wherein the inner hollow sphere is a SnO2 hollow nanosphere, and the outer spherical shell is a hollow mesoporous carbon sphere. The preparation method comprises the following steps of: taking a silicon dioxide@mesoporous carbon sphere material of an incompletely-etched yolk-eggshell structure as a template and a nanoreactor, depositing on the surface of a template silicon dioxide sphere through using a confinement template sacrifice method, completely etching silicon dioxide by using hydroxyl generated by reaction to form a hollow tin dioxide sphere with a controllable size, and forming the double-wall hollow sphere structure with the hollow mesoporous carbon sphere. The internal cavity provides a buffer space for volume expansion caused by tin alloying, and the hollow mesoporous carbon spheres increase the conductivity and the ion transmission rate of the material, so that the electrochemical performance of the composite material is improved.

Description

technical field [0001] The invention relates to a negative electrode material for a lithium ion battery and a preparation method thereof, in particular to SnO with a double-walled hollow sphere structure 2 @C materials and their preparation methods. Background technique [0002] In the research of lithium-ion batteries, graphite, coke, some alloys and metal oxide materials are commonly used as negative electrode materials for lithium-ion batteries. When the battery is charging, Li+ comes out from the positive electrode, and then migrates to the negative electrode through the electrolyte, and enters the lattice of the active material of the negative electrode, so that the lithium ion concentration difference between the positive and negative electrodes becomes larger, so that the two poles of the battery are in a high energy state, making the electric energy stored as chemical energy. During discharge, lithium ions migrate in the opposite direction, and the electrode reacti...

Claims

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Application Information

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IPC IPC(8): H01M4/38H01M4/48H01M4/62
CPCH01M4/48H01M4/38H01M4/625Y02E60/10
Inventor 陈铭谢彬王邓圭王瑞王加明
Owner YANGZHOU UNIV
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