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Tin @ hollow mesoporous carbon sphere material with yolk-egg shell structure and preparation method of tin @ hollow mesoporous carbon sphere material with yolk-egg shell structure

A technology of hollow mesoporous and carbon spheres, applied in structural parts, electrical components, electrochemical generators, etc., can solve problems such as electrode deformation, electrode failure, affecting battery cycle life and safety characteristics, and achieve high rate performance, dispersion Uniform, increased conductivity and ion transport rate effects

Active Publication Date: 2019-12-20
YANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, Sn forms Li during the reversible reaction of Li ions 4 Sn alloy, the volume expansion rate is as high as 300%. Significant volume changes can easily cause electrode deformation, splitting, and pulverization, leading to electrode failure and seriously affecting the cycle life and safety characteristics of the battery.

Method used

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  • Tin @ hollow mesoporous carbon sphere material with yolk-egg shell structure and preparation method of tin @ hollow mesoporous carbon sphere material with yolk-egg shell structure
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  • Tin @ hollow mesoporous carbon sphere material with yolk-egg shell structure and preparation method of tin @ hollow mesoporous carbon sphere material with yolk-egg shell structure

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Experimental program
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preparation example Construction

[0029] 1. Preparation of hollow mesoporous carbon nanospheres:

[0030] Add 50 mL of absolute ethanol, 5 mL of deionized water, and 1 mL of ammonia water into the beaker in turn and perform magnetic stirring. At the same time, add 0.4 mL of tetraethyl orthosilicate to the above mixture, stir the mixture for a period of time, and weigh Add 0.2 g of resorcinol and 0.2 g of formaldehyde to the above mixed solution in sequence, and stir magnetically for 24 h at a water bath temperature of 30 °C. 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 h under the protection of argon at a heating rate of 2 °C / min, and then the calcined product was placed in a water bath at 60 °C. Etched with 2 M sodium hydroxide solution for 12 h. Finally, the etched product is centrifuged and washed, and the obtained solid phase is dried to obtain hollow mesoporous carbon spheres. The obtained hollow me...

Embodiment 1

[0034] (1) Weigh 0.6 g of sodium stannate tetrahydrate and dissolve it in a mixed solvent of 50 ml of water and 100 ml of ethanol. Under vigorous stirring, add 0.15 g of urea and 120 mg of hollow mesoporous carbon spheres, ultrasonicate for 30 min, and place In a hydrothermal reactor, react at 180 °C for 18 h, using hollow mesoporous carbon spheres as nanoreactors, SnO 2 It grows inside the hollow mesoporous carbon spheres and distributes evenly. Naturally cool down to room temperature, collect by centrifugation and dry the sample to obtain SnO 2 @C material.

[0035] (2) The above prepared SnO 2 The @C material was calcined at 600 °C for 4 h in a tube furnace in an argon-hydrogen mixture with a hydrogen content of 5%, and the heating rate was 1 °C / min, to obtain Sn@C nanomaterials with egg yolk-eggshell structure.

Embodiment 2

[0037] (1) Weigh 0.6 g of sodium stannate tetrahydrate and dissolve it in a mixed solvent of 50 ml of water and 50 ml of ethanol. Under vigorous stirring, add 0.3 g of urea and 60 mg of hollow mesoporous carbon spheres, and ultrasonicate for 30 min. In a hydrothermal reactor, react at 180°C for 20h, using hollow mesoporous carbon spheres as nanoreactors, SnO 2 It grows inside the hollow mesoporous carbon spheres and distributes evenly. Naturally cool down to room temperature, collect by centrifugation and dry the sample to obtain SnO 2 @C material.

[0038] (2) the SnO prepared above 2 The @C material was calcined at 650 °C for 3 h in a tube furnace in an argon-hydrogen mixture with a hydrogen content of 5%, and the heating rate was 2 °C / min to obtain Sn@C nanomaterials with egg yolk-eggshell structure.

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Abstract

The invention discloses a tin @ hollow mesoporous carbon sphere material with a yolk-egg shell structure and a preparation method of the tin @ hollow mesoporous carbon sphere material with the yolk-egg shell structure. The material has the yolk-egg shell structure of taking elemental tin nanospheres as a yolk and hollow mesoporous carbon spheres as an egg shell; and the preparation method comprises the steps of taking the hollow mesoporous carbon spheres as nanoreactors and growing SnO2 particles in the nanoreactors; and reducing the SnO2 particles into elemental Sn at high temperature and forming the yolk-egg shell structure by the elemental Sn and the hollow mesoporous carbon spheres. According to the tin @ hollow mesoporous carbon sphere material with the yolk-egg shell structure, elemental Sn spheres are confined into the hollow mesoporous carbon spheres, a negative electrode material does not fall off in charging and discharging processes due to the unique yolk-egg shell structure, buffer space is provided for volume expansion of tin alloying through internal cavities, furthermore, the conductivity and the ion transfer rate of the material are improved through the hollow mesoporous carbon spheres, and improvement of the electrochemical properties of the composite material is facilitated.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery negative electrode material production, and in particular relates to an egg yolk-eggshell structure material composed of metal tin and hollow mesoporous carbon spheres and a preparation method thereof. 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 + It escapes from the positive electrode, 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 state of high energy, so that the electrical energy is stored as chemical energy. During discharge, lithium ions migrate in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525
CPCH01M4/366H01M4/625H01M4/387H01M10/0525Y02E60/10
Inventor 陈铭吴孝余卜玲丽吴雪吴化雨韩悦
Owner YANGZHOU UNIV
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