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Stannic oxide nanoparticles with high electrical property and preparation method therefor

A tin dioxide, electrical performance technology, applied in nanotechnology, circuits, electrical components, etc., can solve the problems of battery cycle performance and battery capacity that cannot meet the needs of industrial applications, cannot achieve industrial applications, and battery specific capacity decay, etc. Excellent charge-discharge cycle performance, excellent rate charge-discharge cycle performance, and good product batch performance

Inactive Publication Date: 2016-04-13
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this preparation method, the preparation steps are cumbersome and the conditions are harsh, but whether it is for SnO 2 The battery capacity or cycle efficiency, its performance improvement is very limited, can not reach the level of industrial applications; another method is to prepare SnO 2 Hollow structure (small2010,6,296), although the specific surface area increases, the specific capacity of the battery decays to only 351mAh / g after 30 cycles
Another method is to prepare nanoscale SnO 2 , currently preparing SnO 2 Most of the methods are concentrated in hydrothermal preparation, need to add L-lysine (application number: 200910084901.2) polyethylene glycol monomethyl ether (application number: 201210448234.3), N-methylimidazole (Nanoscale, 2013, 5, 3262) (The specific capacity of the first charge and discharge is 1898 and 1241mAh / g, and the specific capacity of the battery after 60 times decays to 718mAh / g) and other capping agents to prepare nano-sized SnO 2 material, it can be seen that the SnO 2 Quantum dots have a significant effect on improving the battery cycle performance and battery capacity, but their battery cycle performance and battery capacity still cannot meet the needs of industrial applications

Method used

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  • Stannic oxide nanoparticles with high electrical property and preparation method therefor
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  • Stannic oxide nanoparticles with high electrical property and preparation method therefor

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preparation example Construction

[0032] More specifically, as an example, the preparation method of the present invention may include the following steps.

[0033] 1) Using tin salt as raw material, nano and micro particles soluble under alkaline conditions as template material, prepare a mixed solution of the two, wherein the concentration range of tin salt can be 0.1-5mmol / 40ml, and the concentration range of template material can be 0.1 ~ 5mmol / 40ml.

[0034] Where tin salts include but are not limited to crystalline tin tetrachloride (SnCl 4 ·5H 2 O), anhydrous tin tetrachloride, tin dichloride (SnCl 2 2H 2 O) or anhydrous tin dichloride etc., preferably SnCl 4 ·5H 2 O and SnCl4 .

[0035] Substances (template materials) of nano and micro particles soluble under alkaline conditions include but are not limited to silicon dioxide (SiO 2 ) and / or alumina (Al 2 o 3 ) particles, the particle size of which can be between 5nm and 50μm, and the structure includes various irregular solid particles and hol...

Embodiment 1

[0055] 1) With crystalline tin tetrachloride (SnCl 4 ·5H 2 O) is raw material, silicon dioxide nanotube (referring to patent for preparation method, application number: CN101280457A) is template material, prepares the mixed solution of both at room temperature, wherein the concentration of crystalline tin tetrachloride is 0.5mmol / 40ml, two The concentration of silicon oxide nanotubes is 1mmol / 40ml;

[0056] 2) Stir the mixed solution described in 1) at room temperature for 12 hours;

[0057] 3) The mixed solution in step 2) was centrifuged, and the obtained substance was dispersed in deionized water again, placed in a furnace, and heated at 450° C. for 7 hours;

[0058] 4) Put the powder prepared in step 3) in 50 ml of NaOH solution with a concentration of 0.1 mol / L at a temperature of 50° C. and stir for 24 hours. After centrifugation, the samples were collected and dried in an oven at 70°C for 24 hours. Obtain tin dioxide nanoparticles. The SnO 2 Quantum dot size is 2-...

Embodiment 2

[0062] 1) Using anhydrous tin tetrachloride as raw material, silica hollow spheres (see patent for preparation method, application number: 201310190469.1) as template material, prepare a mixed solution of the two at room temperature, wherein the anhydrous tin tetrachloride The concentration is 1mmol / 40ml, and the concentration of silica nanotubes is 1mmol / 40ml;

[0063]2) Stir the mixed solution described in 1) at room temperature for 18 hours;

[0064] 3) The mixed solution in step 2) was centrifuged, and the obtained substance was dispersed in deionized water again, placed in a furnace, and heated at a temperature of 550° C. for 5 hours;

[0065] 4) Put the powder prepared in step 3) in 50 ml of NaOH solution with a concentration of 0.1 mol / L at a temperature of 50° C. and stir for 24 hours. After centrifugation, the samples were collected and dried in an oven at 70°C for 24 hours. Obtain tin dioxide nanoparticles. The SnO 2 Quantum dot size is 2-4nm, good dispersion;

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Abstract

The invention relates to stannic oxide nanoparticles with high electrical property and a preparation method therefor. The preparation method comprises the following steps of 1) taking tin salt as the raw material, taking sodium, and micro particles that are soluble under an alkali condition as a template material, and dispersing the raw material and the template material into water and uniformly preparing into a mixed solution; 2) stirring the mixed solution at the room temperature for 6-24h and performing solid-liquid separation; 3) heating the solid obtained in the step 2) at a temperature of 400-700 DEG C for 2-8h; and 4) putting the powder obtained in the step 3) into an alkali solution to be fully reacted to remove the template material, then performing solid-liquid separation, and drying the obtained solid to obtain the stannic oxide nanoparticles with high electrical property.

Description

technical field [0001] The invention relates to a SnO with high electrical performance 2 The nanoparticle and its preparation method, as well as its application in lithium ion batteries, belong to the field of nano functional materials. Background technique [0002] The rapid development of new high-energy power supply technology has put forward higher requirements for lithium-ion battery electrode materials. Lithium-ion battery electrode materials with high energy density, high power density, and good charge-discharge cycle characteristics are the focus of scientists' current research. At present, carbon materials (graphene, amorphous carbon, etc.) are the main anode materials for commercial lithium-ion batteries. However, the lithium storage capacity of carbon materials is low (theoretical capacity of graphene is 372mAh / g), which limits the further improvement of lithium-ion battery capacity. Tin dioxide (SnO 2 ) as the negative electrode material of lithium ion batter...

Claims

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Application Information

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IPC IPC(8): H01M4/48B82Y40/00
CPCY02E60/10
Inventor 金平实王兵兵纪士东
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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