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Method for preparing nanometer foam stannic oxide of lithium ion battery cathode material

A lithium-ion battery and tin dioxide technology, applied in tin oxide, battery electrodes, nanotechnology, etc., can solve the problems of complex operation process, difficulty in mass production, and high cost, and achieve simple reaction process and large-scale production Effect

Inactive Publication Date: 2010-09-08
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] There are many preparation methods for tin dioxide, such as sol-gel method, low-pressure chemical vapor deposition method, electrostatic spraying method, pyrolysis spraying method, urea medium hydrolysis method, magnetron sputtering method, microemulsion method, microwave radiation method etc. This type of method has high requirements on equipment, complicated operation process, strict process control requirements, the preparation process will cause different degrees of pollution to the environment, and the cost is high, the efficiency is low, and it is difficult to achieve mass production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Prepare 20ml molar concentration of 0.5mol L -1 Put the aqueous glucose solution in a 50ml hydrothermal reaction kettle, heat it to 180°C in an oil bath, and keep the temperature constant for 4 hours to obtain the aqueous solution A of high-carbon polycondensation spheres; then prepare 80ml of SnCl with a molar concentration of 0.012mol / L 4 ·5H 2 O solution B; pour solution B into solution A, ultrasonicate for 40 minutes, place in an oven, heat to 80°C, and keep the temperature constant for 4 hours to obtain precursor powder C of tin dioxide-coated high-carbon polycondensation spheres. The obtained precursor powder C was placed in a porcelain boat, put into a tube furnace, and the following calcination process was adopted: in air, at 1 °C min -1 The heating rate is heated to 550°C, and the temperature is maintained for 4 hours; then cooled to room temperature with the furnace to obtain foamed tin dioxide with a wall thickness of about 10nm and a pore size of 100-200nm....

Embodiment 2

[0014] Embodiment two: preparation 20ml molar concentration is 0.75mol L -1 Put the aqueous glucose solution in a 50ml hydrothermal reaction kettle, heat it to 180°C in an oil bath, and keep the temperature constant for 6 hours to obtain the aqueous solution A of high-carbon polycondensation spheres; then prepare 80ml of SnCl with a molar concentration of 0.012mol / L 4 ·5H 2 O solution B; pour solution B into solution A, ultrasonically treat for 60 minutes, place in an oven, heat to 90°C, and keep the temperature constant for 6 hours to obtain precursor powder C of tin dioxide-coated high-carbon polycondensation spheres. The obtained precursor powder C was placed in a porcelain boat, put into a tube furnace, and the following calcination process was adopted: under an argon protective atmosphere, at 1 °C min -1 The heating rate is heated to 750°C, and the temperature is kept constant for 6 hours; then cooled to room temperature with the furnace to obtain a tin dioxide / carbon co...

Embodiment 3

[0015] Embodiment three: preparation 20ml molar concentration is 0.5mol L -1 Put the sucrose aqueous solution into a 50ml hydrothermal reaction kettle, heat the oil bath to 180°C, and keep the temperature for 4 hours to obtain the high-carbon polycondensation sphere aqueous solution A; then prepare 80ml of SnCl with a molar concentration of 0.012mol / L 4 ·5H 2 O solution B; pour solution B into solution A, ultrasonicate for 40 minutes, place in an oven, heat to 80°C, and keep the temperature constant for 4 hours to obtain precursor powder C of tin dioxide-coated high-carbon polycondensation spheres. The obtained precursor powder C was placed in a porcelain boat, put into a tube furnace, and the following calcination process was adopted: in air, at 1 °C min -1 The heating rate is heated to 550°C, and the temperature is maintained for 4 hours; then cooled to room temperature with the furnace to obtain foamed tin dioxide with a wall thickness of about 10nm and a pore size of 100-...

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Abstract

The invention discloses a method for preparing nanometer foam stannic oxide of a lithium ion battery cathode material, which is characterized in that SnC14.5H2O solution is mixed with carbon ball solution which is prepared with a hydrothermal synthesis method under the ultrasonic treatment condition, hydrothermal synthesis reaction is proceeded to obtain a foam stannic oxide precursor, solid phase sintering of the foam stannic oxide precursor is undertaken to obtain the nanometer foam stannic oxide (or foam stannic oxide / carbon composite material) with good dispersibility and uniform distribution of aperture. The method can enlarge the application range of the stannic oxide; and on the basis of the hydrothermal synthesis and solid-phase segmentation method, with the method of the ultrasonic treatment, the entire reaction process is simple and is free from toxic substances or environmental pollutants, the method is environment-friendly and belongs to an environment-friendly chemical preparation method; and moreover, the method can realize the mass production, and the required chemical agent is inexpensive and is easy to buy.

Description

technical field [0001] The invention belongs to a material preparation method, in particular to a method for preparing nanoscale foamed tin dioxide, a negative electrode material of a lithium ion battery. Background technique [0002] Tin dioxide products are mostly used in the production of electronic components, preparation of tin salt, enamel pigment, polishing agent for marble and glass, synthesis of opaque glass, antifreeze glass and high-strength glass, etc. For example, it is used in wood coatings, conductive coatings, marine antifouling coatings, special paint coatings and rubber additives. It is noteworthy that in the research of lithium-ion battery anode materials, tin dioxide has a low lithium intercalation potential (about 0.5Vvs.Li + / Li) and high lithium intercalation capacity (781mAh / g), especially, nano-foamed tin dioxide has a large specific surface area, and can effectively inhibit the volume change during charge and discharge, improve its capacity and cyc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G19/02B82B3/00H01M4/139H01M4/48
CPCY02E60/122Y02E60/10
Inventor 赵铭姝汪飞宋晓平尧刚
Owner XI AN JIAOTONG UNIV
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