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Preparation method of silicon-silicon oxide-carbon composite negative pole material of lithium ion battery

A lithium-ion battery and silicon oxide technology, which is applied in the direction of electrode manufacturing, battery electrodes, secondary batteries, etc., can solve the problems of sol-gel method preparation process control difficulties, poor industrial operability, and complex processes, etc., to achieve improved The effects of reversible specific capacity, easy operation, and simple and easy-to-control process conditions

Active Publication Date: 2014-04-16
TIANJIN B&M SCI & TECH
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  • Application Information

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Problems solved by technology

However, the process of this method is complicated, the cost is high, and the preparation process of the sol-gel method is difficult to control, and the industrial operability is poor.

Method used

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  • Preparation method of silicon-silicon oxide-carbon composite negative pole material of lithium ion battery
  • Preparation method of silicon-silicon oxide-carbon composite negative pole material of lithium ion battery
  • Preparation method of silicon-silicon oxide-carbon composite negative pole material of lithium ion battery

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preparation example Construction

[0021] The preparation method of lithium ion battery silicon-silicon oxide-carbon composite negative electrode material of the present invention comprises the following steps:

[0022] The silicon oxide, silicon and graphite with a weight ratio of 1:0.01-10:0.5-50 are mixed by mechanical ball milling to obtain a primary mixed material. Then, it is uniformly mixed with 0.1-10 times the weight of asphalt and 1-200 times the weight of organic solvent, and dried to obtain the secondary mixed material. The secondary mixed material is treated at a high temperature of 500-1100° C. for 0.5-20 hours in an inert protective atmosphere, and the temperature is lowered to obtain a silicon-silicon oxide-carbon composite negative electrode material for a lithium ion battery.

[0023] In the ball milling mixing step described in the above method, the silicon oxide is one of silicon monoxide or silicon dioxide; in the secondary mixing step, the pitch is one of petroleum pitch, coal pitch or nat...

Embodiment 1

[0027] Under the protection of an argon atmosphere, silicon monoxide, silicon and graphite in a weight ratio of 1:0.05:1 were mechanically ball milled and mixed to obtain a primary mixed material. It is then mixed with 2 times the weight of petroleum pitch and 10 times the weight of tetrahydrofuran, stirred and mixed, and dried to obtain the secondary mixed material. The secondary mixed material is treated at 800°C for 4 hours in a mixed atmosphere of hydrogen and argon containing 5% (volume ratio) of hydrogen, and the temperature is lowered to obtain a silicon-silicon oxide-carbon composite negative electrode material for lithium-ion batteries.

[0028] figure 1 is the X-ray diffraction (XRD) spectrum of the silicon-silicon oxide-carbon composite negative electrode material prepared above. It can be seen from the figure that the sharper diffraction peaks in the figure belong to the diffraction peaks of graphite and elemental silicon, while the broad peaks between 20° and 30°...

Embodiment 2

[0031] Under the protection of argon atmosphere, silicon monoxide, silicon and graphite with a weight ratio of 1:0.5:10 were mechanically ball milled and mixed to obtain a primary mixed material. It is then mixed with 3 times the weight of coal tar pitch and 60 times the weight of cyclohexane, ultrasonically dispersed, and dried to obtain a secondary mixed material. Treat the secondary mixed material at 900° C. for 2 hours in an argon atmosphere, and cool down to obtain a silicon-silicon oxide-carbon composite negative electrode material for a lithium-ion battery.

[0032] According to the battery conditions in Example 1, the cycle performance of the prepared silicon-silicon oxide-carbon composite negative electrode material in a 2032-type button battery was tested. The test results are: the first discharge capacity of the electrode is 605.7mAh / g, the first coulombic efficiency is 78.5%, and after 50 cycles, the capacity retention rate is 96.3%.

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Abstract

The invention discloses a preparation method of a silicon-silicon oxide-carbon composite negative pole material of a lithium ion battery. Silicon oxide, silicon and graphite are mixed via ball milling, and then are blended with bitumen to form a mixture, and the mixture is subjected to high-temperature heat treatment so as to obtain the silicon-silicon oxide-carbon composite negative pole material of the lithium ion battery. According to the preparation method, the silicon is added to a silicon oxide-carbon material, can improve the reversible capacity and the initial Coulomb efficiency of the silicon oxide-carbon material, and enables a silicon oxide composite material to have excellent properties such as high capacity, better circulation performance and higher initial Coulomb efficiency. The preparation method has such advantages as low cost, simple equipment, simple and easily controlled technology condition and high yield, and is very suitable for mass industrial production.

Description

technical field [0001] The invention relates to a method for preparing a negative electrode material of a lithium ion battery, in particular to a method for preparing a silicon-silicon oxide-carbon composite negative electrode material for a lithium ion battery. Background technique [0002] Silicon oxide (SiO x , 0<x≤2) due to the lithium oxide (Li 2 O) and lithium silicate (Li 4 SiO 4 ) can better buffer the volume effect of nano-silicon active materials, so it has high specific capacity and excellent cycle performance, and has become a negative electrode material that has been hot researched by the lithium battery industry in recent years. However, silicon oxide is still difficult to be practical at present, because lithium is consumed in the initial electrochemical charge / discharge process to generate irreversible lithium oxide and lithium silicate, resulting in a large irreversible capacity for the first time, the first coulombic efficiency is less than 60%, and t...

Claims

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Application Information

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IPC IPC(8): H01M4/38H01M4/04
CPCH01M4/364H01M10/0525Y02E60/10
Inventor 吴孟涛梁运辉杨化滨高川
Owner TIANJIN B&M SCI & TECH
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