Preparation method of mesoporous SiOx/C composite negative material of lithium-ion battery

A technology for lithium-ion batteries and negative electrode materials, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of poor cycle performance of electrodes, unsuitable for large-scale preparation, complicated process, etc., and achieve good cycle stability and rate performance , facilitate large-scale preparation, the effect of uniform distribution of ingredients

Active Publication Date: 2013-09-04
DONGGUAN KAIJIN NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Silicon has become the most promising negative electrode material due to its high specific capacity (4200 mAh / g), low lithium intercalation potential, and wide range of raw material sources. This problem has not been well solved, which limits its commercial application.
The preparation method of the above method is either complicated in process or low in yield, and is not suitable for large-scale preparation

Method used

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  • Preparation method of mesoporous SiOx/C composite negative material of lithium-ion battery
  • Preparation method of mesoporous SiOx/C composite negative material of lithium-ion battery
  • Preparation method of mesoporous SiOx/C composite negative material of lithium-ion battery

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Embodiment 1

[0028] Dissolve 0.46 g of sodium hydroxide in 120 ml of deionized water and stir until completely dissolved; weigh 1.0 g of polyvinylpyrrolidone (PVP) and 1.40 g of hexadecyltrimethylammonium bromide and dissolve in the above solution, Stir until completely dissolved. Measure 5.80 ml tetraethyl orthosilicate and slowly pour it into the above solution, stir vigorously for 24 hours, and transfer the obtained white suspension to a 200 ml hydrothermal kettle with a polytetrafluoroethylene liner at 50 o C constant temperature hydrothermal treatment for 48 hours. The naturally cooled liquid was repeatedly washed with alcohol and deionized water and filtered five times, and the obtained white powder was dispersed in a 120 ml beaker and vigorously stirred for 30 min. Weigh 1.0 g of sucrose and dissolve it in the above suspension, stir until it is completely dissolved, then carry out rotary evaporation, the rotation speed is 100 rpm, and the temperature of the water area is 90 o C, o...

Embodiment 2

[0030] Dissolve 0.46 g of sodium hydroxide in 120 ml of deionized water and stir until completely dissolved; weigh 1.0 g of polyvinylpyrrolidone (PVP) and 1.30 g of dodecyltrimethylammonium bromide and dissolve in the above solution, Stir until completely dissolved. Measure 5.80 ml tetraethyl orthosilicate and slowly pour it into the above solution, stir vigorously for 24 hours, and transfer the obtained white suspension to a 200 ml hydrothermal kettle with a polytetrafluoroethylene liner at 80 o C constant temperature hydrothermal treatment for 48 hours. The naturally cooled liquid was repeatedly washed with alcohol and deionized water and filtered five times, and the obtained white powder was dispersed in a 120 ml beaker and vigorously stirred for 30 min. Weigh 1.0 g of sucrose and dissolve it in the above suspension, stir until it is completely dissolved, then carry out rotary evaporation, the rotation speed is 100 rpm, and the temperature of the water area is 90 o C, obt...

Embodiment 3

[0032] Dissolve 0.46 g of sodium hydroxide in 120 ml of deionized water and stir until completely dissolved; weigh 1.0 g of polyvinylpyrrolidone (PVP) and 1.40 g of cetyltrimethylammonium bromide and dissolve in the above solution , and stir until completely dissolved. Measure 5.0 ml of methyl orthosilicate and slowly pour it into the above solution, stir vigorously for 24 hours, transfer the obtained white suspension to a 200 ml hydrothermal kettle with a polytetrafluoroethylene liner at 80 o C constant temperature hydrothermal treatment for 48 hours. The naturally cooled liquid was repeatedly washed with alcohol and deionized water and filtered five times, and the obtained white powder was dispersed in a 120 ml beaker and vigorously stirred for 30 min. Weigh 1.0 g of sucrose and dissolve it in the above suspension, stir until it is completely dissolved, then carry out rotary evaporation, the rotation speed is 100 rpm, and the temperature of the water area is 90 o C, obtain...

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Abstract

The invention discloses a preparation method of a mesoporous SiOx/C composite negative material of a lithium-ion battery, and belongs to the fields of new materials and electrochemistry. The preparation method comprises the following steps of: taking polyvinylpyrrolidone as an auxiliary template agent, taking an organic surface active agent as a template agent and organic silicon as a silicon source, obtaining mesoporous silica precursor by hydrothermal treatment, adding a carbon source, and preparing SiOx/C composite negative material with a mesoporous structure by carbothermic reduction reaction occurring in the process of high-temperature thermal treatment. The preparation method disclosed by the invention has the advantages that the specific capacity of the material is high, the structure is novel, and simultaneously the cycling stability is good; the yield is high; and the prepared SiOx/C composite material is fine in particle, uniform in particle size and component distribution, high in specific capacity and good in cycling stability, is an ideal composite negative material of the lithium-ion battery, and can be widely applied in the fields such as various portable electronic equipment, electric vehicles and aerospace.

Description

technical field [0001] The invention belongs to the field of new materials and electrochemistry, and in particular relates to a SiOx / C lithium ion battery composite negative electrode material with high discharge specific capacity and a preparation method thereof. Background technique [0002] With the increase of global population, economic development, and improvement of living standards, the increase in energy demand, as well as the reduction of fossil fuels and the crisis of global warming, have forced human beings to turn to the development and utilization of new energy sources (such as wind energy, solar energy, and tidal energy) . However, these new energy sources are intermittent and cannot provide a stable energy supply. As a lithium-ion secondary battery that stores and provides a stable energy supply, it may provide an important solution to the current energy crisis, so it is receiving more and more attention. s concern. In addition, with the current trend of mi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48
CPCY02E60/10
Inventor 赵海雷高春辉吕鹏鹏王捷王静王春梅
Owner DONGGUAN KAIJIN NEW ENERGY TECH
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