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Preparation method for silicon-carbon composite material, prepared silicon-carbon composite material, lithium ion battery anode containing silicon-carbon composite material and battery

A silicon-carbon composite material, porous carbon technology, applied in battery electrodes, non-aqueous electrolyte battery electrodes, secondary batteries, etc., can solve the problems of structural damage, unfavorable volume expansion, high price of nano-silicon powder, etc., and achieve improved specific capacity. and cycle performance, improve electrochemical stability, and improve the effect of silicon volume effect

Active Publication Date: 2014-11-26
CHERY AUTOMOBILE CO LTD
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Problems solved by technology

The raw material nano-silica powder of this method is expensive, and the nano-silica powder is easy to agglomerate, it is difficult to disperse evenly in the phenolic resin, and the silicon-carbon composite material produced is simply carbon-coated silicon, and there is no preset between silicon and carbon. space, which is not conducive to controlling the volume expansion of silicon. During the charging and discharging process, the structure of the silicon-carbon composite material will be destroyed due to the volume change of silicon, thereby reducing the cycle performance of the negative electrode material.

Method used

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  • Preparation method for silicon-carbon composite material, prepared silicon-carbon composite material, lithium ion battery anode containing silicon-carbon composite material and battery
  • Preparation method for silicon-carbon composite material, prepared silicon-carbon composite material, lithium ion battery anode containing silicon-carbon composite material and battery

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preparation example Construction

[0030] Now, the present invention will be further described in detail by taking the preparation method of a specific silicon-carbon composite material as an example.

[0031] The ultrasonic frequency used in the present invention is 40,000 Hz.

Embodiment 1

[0033] The preparation process of silicon-carbon composite materials with porous carbon spheres coated nano-silicon structure is as follows: figure 1 As shown, the specific steps are as follows:

[0034](1) Synthesis of polymer-coated SiO precursor: 2.20g catechol, 2ml formaldehyde (the molar ratio of phenolic monomer and aldehyde monomer is about 1:1) and 5ml concentrated hydrochloric acid (catalyst in the reactant solution 3.9mol / L) into 10ml of ethanol, stir to dissolve it completely, put it into the reactor, and add 0.9g of SiO powder into the reactor (the molar ratio of SiO powder to phenol monomer is about 1:1 ), after ultrasonic dispersion for 30 minutes, the resulting mixture was stirred and reacted at 85° C. for 1.5 h. After the above mixture reacted to form a gel, the reaction vessel was sealed and placed in an oven, and the reaction was continued at 120° C. for 8 h. Pound and grind the loose and porous brown substance obtained from the above reaction, put it in an...

Embodiment 2

[0041] (1) Synthesis of polymer-coated SiO precursor: 0.94g phenol, 1.1g hydroquinone, 4ml formaldehyde (phenol-formaldehyde molar ratio 1:2) and 0.5ml concentrated hydrochloric acid (the concentration of the catalyst in the reactant solution is 0.1mol / L) into 55ml of ethanol, stirred to dissolve completely, then put into the reactor, and added 1.8g of SiO powder (SiO powder to phenol monomer molar ratio 2:1) into the reactor, ultrasonically dispersed for 5 minutes The resulting mixture was then magnetically stirred at 60°C for 3 hours. After the above mixture reacted to form a gel, the reaction vessel was sealed and placed in an oven, and the reaction was continued at 60° C. for 24 h. The loose and porous brown substance obtained from the above reaction was crushed and ground, and dried in an oven at 90°C for 18 hours to obtain a phenolic resin polymer-coated SiO precursor;

[0042] (2) Heat treatment: heat the material obtained in step (1) under the protection of 95% argon ...

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Abstract

The invention provides a preparation method for a silicon-carbon composite material, the prepared silicon-carbon composite material, a battery anode prepared from the material and a lithium ion battery. The preparation method comprises the following steps of: directly mixing free phenol, free aldehyde and silicon monoxide, performing polymerization reaction under certain conditions to obtain a mixture of a phenolic resin and the silicon monoxide which is coated by the phenolic resin, and performing thermal treatment and corrosion to obtain the silicon-carbon composite material with a core shell structure. The preparation method is simple. The prepared silicon-carbon composite material has the advantages of high specific capacity and high cycle performance.

Description

technical field [0001] The invention belongs to the technical field of battery manufacturing, and in particular relates to a method for preparing a silicon-carbon composite material, the prepared silicon-carbon composite material, and a lithium ion battery negative electrode and battery containing the silicon-carbon composite material. Background technique [0002] With the depletion of fossil fuels and the rapid development of portable electronic devices and electric vehicles, the research on new energy sources such as power source batteries has become the focus of global attention. Excellent properties such as good performance, environmental friendliness, structural diversity and low price have been widely used. As far as the structure of lithium ion battery is concerned, it is mainly composed of positive electrode, negative electrode, separator and electrolyte, and whether the electrode performance of negative electrode material can be further improved becomes the decisiv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/38H01M4/13H01M10/0525
CPCY02E60/122Y02E60/10
Inventor 朱广燕曾绍忠刘三兵
Owner CHERY AUTOMOBILE CO LTD
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