Stannic oxide nanotubes with high electrical properties and preparation method therefor

Abstract

The invention relates to stannic oxide nanotubes with high electrical properties and a preparation method therefor. The method comprises the steps: (1) preparing a first mixed solution containing silicon dioxide nanotubes and / or titanium dioxide nanotubes, an alcoholic solution, a tin salt and urea; (2) subjecting the first mixed solution to a reaction in a hydrothermal reactor; (3) carrying out centrifugal separation on the reacted first mixed solution, so as to obtain a first sediment; (4) calcining the first sediment; (5) putting the calcined first sediment in a strongly alkaline solution, so as to obtain a second mixed solution; and (6) carrying out centrifugal separation on the second mixed solution so as to obtain a second sediment, washing the second sediment, and carrying out drying, thereby obtaining the stannic oxide nanotubes with high electrical properties.

Description

technical field [0001] The invention belongs to the field of nano functional materials, in particular to a tin dioxide nanotube with high electrical performance and a preparation method thereof. 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 battery, its theoretical capacity is 790mAh / g, fa...

AI Technical Summary

Problems solved by technology

This preparation method has tedious preparation steps and harsh conditions, but whether it is for SnO 2 battery capacity or cycle efficiency, its performance improvement is very limited and cannot reach the level of industrial applications; another method is to prepare nanoscale SnO 2 , currently preparing SnO 2 Most of the methods are concentrated in the preparation of hydrothermal method, need to add L-lysine (patent number: 200910084901.2), N-methylimidazole (Nanoscale, 2013, 5, 3262) (the first charge and discharge specific capacity is 1898 and 1241mAh / g , after 60 cycles, the specific capacity of the battery decays to 718mAh / g) and other capping agents to prepare nanoscale SnO 2 Material

Another way 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

It can be seen that the SnO 2 The hollow tube has a large specific surface area and cavity, which has a certain effect on improving its battery cycle performance and battery capacity, but its battery cycle performance and battery capacity still cannot meet the needs of industrial applications.

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