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Preparation of tin dioxide nano line array electrode for lithium battery

A nanowire array, tin dioxide technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of short nanowire length, low first charge and discharge efficiency of batteries, disordered arrangement, etc. Electrode charge adsorption amount and electrode stability, simple effect of equipment requirements

Inactive Publication Date: 2009-03-18
SHANGHAI JIAO TONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the deficiencies of the prior art, the present invention provides a method for preparing a tin dioxide nanowire array electrode for a lithium battery, so that it can solve the problems caused by the short length and disordered arrangement of the nanowires in the tin dioxide nanowire electrode. The problem of low charging and discharging efficiency for the first time

Method used

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  • Preparation of tin dioxide nano line array electrode for lithium battery
  • Preparation of tin dioxide nano line array electrode for lithium battery
  • Preparation of tin dioxide nano line array electrode for lithium battery

Examples

Experimental program
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Embodiment 1

[0026] Such as figure 1 As shown, the second tube furnaces 1 and 2 are both one-stage constant temperature resistance heating quartz tubes, and the ceramic boat is ensured to be placed at the thermocouple of the tube furnace during the reaction process.

[0027] Weigh 2g of tin powder and put it into a ceramic boat, place it in the middle of the first tube furnace 2, and place a silicon wafer of a noble metal Au catalyst with a thickness of about 100nm by magnetron sputtering at a distance of 1cm downwind of the ceramic boat. Weigh 100 mg of sulfur powder and selenium (mass ratio 9:1) into a ceramic boat, and place the ceramic boat in the middle of the second tube furnace 1 . The closed system continuously feeds high-purity nitrogen with a flow rate of 20 sccm. After the time of passing nitrogen gas for one hour, raise the temperature of the first tube furnace 2 to 800°C at a heating rate of 50°C / min. After the tube temperature reaches 800°C, raise the temperature of the seco...

Embodiment 2

[0030] Weigh 5g of tin powder and put it into a ceramic boat, place it in the middle of the first tube furnace 2, and place a silicon wafer of a noble metal Au catalyst with a thickness of about 100nm by magnetron sputtering at a distance of 3cm downwind of the ceramic boat. Weigh 1000 mg of sulfur powder and selenium (mass ratio 9:1) into a ceramic boat, and place the ceramic boat in the middle of the second tube furnace 1 . Closed system, continuously fed high-purity nitrogen with a flow rate of 300 sccm. After the nitrogen flow time reaches one hour, raise the temperature of the first tube furnace 2 to 1300°C at a heating rate of 30°C / min. The temperature of tube furnace 1 is up to 300°C. The second tube furnace 1 was kept at 300° C. for 5 minutes and then cooled down naturally. The first tube furnace 2 was kept at 1300° C. for 30 minutes, then cooled down naturally, and the ventilation valve was closed. After cooling to room temperature, a similar figure 2 The tin dio...

Embodiment 3

[0032]Weigh 3.5g of tin powder and put it into a ceramic boat, place it in the middle of the first tube furnace 2, and place a silicon wafer of a noble metal Au catalyst with a thickness of about 100nm by magnetron sputtering at a distance of 2cm downwind of the ceramic boat. Weigh 500mg of sulfur powder and put it into a ceramic boat, which is placed in the middle of the second tube furnace 1 . The closed system continuously feeds high-purity argon with a flow rate of 160 sccm. After the nitrogen gas flow time reaches one hour, raise the temperature of the first tube furnace 2 to 1050°C at a heating rate of 40°C / min. The temperature of tube furnace 1 is up to 200°C. The second tube furnace 1 was kept at 200° C. for 12 minutes and then cooled down naturally. The first tube furnace 2 was kept at 1300° C. for 45 minutes, then cooled down naturally, and the ventilation valve was closed. After cooling to room temperature, a similar figure 2 The tin dioxide nanowire array elec...

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Abstract

The invention relates to a method for manufacturing a stannic oxide nano-wire array electrode for lithium batteries, which belongs to the technical field of energy source, and comprises utilizing tin powder as raw materials, utilizing IV-VI group monomers as nano-wire growth direction exutory, utilizing noble metal as catalyst, thermally evaporating under normal pressure in 800-1300 DEG C, and getting stannic oxide nano-wire array on a silicon substrate. The invention firstly proposes to use IV-VI group monomer as growth direction exutory, which leads nano wires to preferentially grow in array as vapor-liquid-solid (VLS) mechanism on a (001) surface whose surface energy is higher, thereby getting regular, ordered and longer stannic oxide nano-wire array. The nano-wire array is suitable for lithium battery electrodes with high performance.

Description

technical field [0001] The invention relates to a method for preparing an electrode in the field of battery technology, in particular to a method for preparing a tin dioxide nanowire array electrode used in a lithium battery. Background technique [0002] Lithium batteries have very high specific energy density and charge-discharge times, and are the best source of power for mobile electronic devices such as mobile phones, notebook computers, camcorders, and environmentally friendly electric mopeds. At present, lithium batteries use mesophase carbon microspheres (MCMB) as the main electrode material. The main problem of this electrode is that the specific capacity is not high (less than 300mAh g -1 ), the first cycle efficiency is low. In particular, it is necessary to graphitize mesophase pitch carbon microspheres at a high temperature of 2800°C. The process conditions are complicated and the cost is high, which is not conducive to further development and promotion. New e...

Claims

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Application Information

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IPC IPC(8): H01M4/48H01M4/139
CPCY02E60/10
Inventor 张亚非周志华张丽英
Owner SHANGHAI JIAO TONG UNIV
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