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Preparation method and application of hollow SnO2@C nanosphere in lithium ion battery

A lithium ion battery, hollow nano technology, applied in nano composite materials and their application fields, to achieve the effects of good dispersibility, large capacity and slowing down agglomeration and pulverization

Inactive Publication Date: 2013-07-10
NORTHEAST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But so far, there are no literature and patent reports using this method to synthesize SnO with high dispersion and uniform particle size. 2 C hollow nanosphere

Method used

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  • Preparation method and application of hollow SnO2@C nanosphere in lithium ion battery
  • Preparation method and application of hollow SnO2@C nanosphere in lithium ion battery
  • Preparation method and application of hollow SnO2@C nanosphere in lithium ion battery

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Add 60 mL of ethanol, 3 mL of ammonia water and 1 mL of water into a 100 mL flask successively, stir and mix evenly, then slowly add 2.3 mL of tetraethyl orthosilicate (TEOS) dropwise, 20 o C and stirred at constant temperature for 6 h. The resulting solution was centrifuged (7000 rpm, 8 min), washed several times with deionized water and absolute ethanol, and then washed at 50 o C for 10 h. Weigh 1.0 mg of the above oven-dried silica nanoparticles and disperse them in a mixed solution of 3 mL of water and 3 mL of ethanol, and then add 0.24 mL of 0.2 M urea (CH 4 N 2 O) and 0.45 mL 0.08 M sodium stannate (Na 2 SnO 3 ·H 2 O) was added to the above reaction solution, and after stirring for 0.5 h, the mixture was transferred to a 15 mL hydrothermal reaction kettle. 170 in oven o C for 1 h, naturally cooled to room temperature, centrifuged (7000 rpm, 8 min), and then washed several times with deionized water and absolute ethanol, the obtained solid was 50 o C drying...

Embodiment 2

[0032] Add 80 mL of ethanol, 4 mL of ammonia water and 1.3 mL of water into a 100 mL flask successively, stir and mix evenly, then slowly add 3.0 mL of tetraethyl orthosilicate (TEOS) dropwise, 20 o C was stirred at constant temperature for 8 h. The resulting solution was centrifuged (7000 rpm, 10 min), washed several times with deionized water and absolute ethanol, and then washed at 60 o C for 10 h. Weigh 1.5 mg of the above dried silica nanoparticles and disperse them in a mixed solution of 3.5 mL of water and 3.5 mL of ethanol, and then add 0.3 mL of 0.2 M urea (CH 4 N 2 O) and 0.5 mL 0.08 M sodium stannate (Na 2 SnO 3 ·H 2 O) was added to the above reaction solution, and after stirring for 1 h, the mixture was transferred to a 15 mL hydrothermal reaction kettle. 170 in oven o C for 2 h, naturally cooled to room temperature, centrifuged (7000 rpm, 10 min), and then washed several times with deionized water and absolute ethanol, the obtained solid 70 o C dried for 8...

Embodiment 3

[0035] Add 70 mL of ethanol, 3.5 mL of ammonia water and 1.1 mL of water into a 100 mL flask successively, stir and mix evenly, then slowly add 2.0 mL of tetraethyl orthosilicate (TEOS) dropwise, 20 o C and stirred at constant temperature for 7 h. The resulting solution was centrifuged (7000 rpm, 9 min), washed several times with deionized water and absolute ethanol, and then washed at 70 o Dry at C for 8 h. Weigh 1.2 mg of the above dried silica nanoparticles and disperse them in a mixed solution of 3.2 mL of water and 3.2 mL of ethanol, and then add 0.22 mL of 0.2 M urea (CH 4 N 2 O) and 0.4 mL 0.08 M sodium stannate (Na 2 SnO 3 ·H 2 O) was added to the above reaction solution, and after stirring for 0.6 h, the mixture was transferred to a 15 mL hydrothermal reaction kettle. 170 in oven o C for 1.5 h, naturally cooled to room temperature, centrifuged (7000 rpm, 9 min), and then washed several times with deionized water and absolute ethanol, the obtained solid 60 o C ...

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Abstract

The invention belongs to the technical field of nanocomposites, and in particular relates to a preparation method of a hollow SnO2@C nanosphere with a core-shell structure and an application of the hollow SnO2@C nanosphere in a lithium ion battery. The preparation method comprises the following steps: synthesizing a hollow SnO2 nanosphere with high dispersibility and uniform particle diameter by taking silica as a template via one-step process; and wrapping a carbon layer on the hollow SnO2 nanosphere by taking PAA (Phenolic Aldehyde Amine) as a carbon source, thereby preparing the hollow SnO2@C nanosphere with the core-shell structure. According to the invention, the purpose of integrating the regulating effects of the nanoscale dispersion of nanoparticles to the volume expansion of SnO2, the absorbing effects of the hollow structure to the internal stress generated by volume changes and the restricting and buffering effects of the carbon wrapping layer to stannic oxide particles is achieved; and when the hollow SnO2@C nanosphere is applied to the lithium ion battery, the lithium ion battery can have a larger volume, better cycling stability and longer service life.

Description

[0001] technical field [0002] The invention belongs to the technical field of nanocomposite materials and their applications, in particular to a SnO 2 Preparation method of C hollow nanospheres and its application in lithium-ion batteries. Background technique [0003] Lithium-ion batteries have been widely used in various portable electronic devices because of their advantages such as fast charging speed, long cycle life, high energy density and working voltage, safety and pollution-free. With the advancement of science and technology and the improvement of people's living standards, higher requirements are placed on lithium-ion batteries. As far as lithium-ion battery anode materials are concerned, the current commercialized carbon materials have problems such as low specific capacity and poor safety performance, which can no longer meet the needs of a new generation of high specific capacity battery anode materials. Therefore, how to replace the currently used carbon ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G19/02C01B31/02B01J13/02H01M4/36H01M4/48B82Y30/00C01B32/15
CPCY02E60/10
Inventor 李鹿苏忠民王春刚
Owner NORTHEAST NORMAL UNIVERSITY
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