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A kind of preparation method of silicon-carbon composite film negative electrode of lithium battery

A silicon-carbon composite and lithium battery technology, which is applied in battery electrodes, negative electrodes, secondary batteries, etc., can solve problems such as poor cycle performance and complicated preparation methods, and achieve excellent cycle times, simple preparation methods and processes, and cycle performance Good results

Active Publication Date: 2020-12-22
东营市东凯新材料技术研发有限责任公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] Aiming at the problems that the current lithium battery silicon-based negative electrode preparation method is complicated and the cycle performance is poor, the present invention proposes a method for preparing a lithium battery silicon-carbon composite thin film negative electrode

Method used

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  • A kind of preparation method of silicon-carbon composite film negative electrode of lithium battery

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Experimental program
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Effect test

Embodiment 1

[0033] Preparation of silicon-carbon composite thin film:

[0034] (1) Using thermoplastic organic film polyimide film as raw material, the film is stretched in a rolling equipment with three sets of rollers, and the speed ratio of the three sets of rollers is 1:1.1:1.2; at 300°C rolling, such as figure 1 As shown, tetraethyl orthosilicate is sprayed before the first set of rollers, supersaturated aqueous sodium bicarbonate solution is sprayed between the first set of rollers and the second set of rollers, and between the second set of rollers and the third set of rollers Spray 3mol / L ammonia water; the distance between the first group of rollers is 0.02mm, the distance between the second group of rollers is 0.015mm, and the distance between the third group of rollers is 0.01mm;

[0035] (2) Dry the stretched thermoplastic organic film in step (1), and then evenly spray a small amount of 0.05g / cm2 on its surface 2 Magnesium powder, folded and cut, is a thermoplastic organic ...

Embodiment 2

[0040] Preparation of silicon-carbon composite thin film:

[0041] (2) Using thermoplastic organic film polyimide film as raw material, the film is stretched in a rolling equipment with three sets of rollers. The speed ratio of the three sets of rollers is 1:1.05:1.2; at 300°C rolling, such as figure 1 As shown, tetraethyl orthosilicate is sprayed before the first set of rollers, supersaturated aqueous sodium bicarbonate solution is sprayed between the first set of rollers and the second set of rollers, and between the second set of rollers and the third set of rollers Spray 4mol / L ammonia water; the distance between the first group of rollers is 0.02mm, the distance between the second group of rollers is 0.015mm, and the distance between the third group of rollers is 0.01mm;

[0042] (2) Dry the stretched thermoplastic organic film in step (1), and then evenly spray a small amount of 0.06g / cm2 on its surface 2 Magnesium powder, folded and cut, is a thermoplastic organic fil...

Embodiment 3

[0047] Preparation of silicon-carbon composite thin film:

[0048] (3) Using thermoplastic organic film polyimide film as raw material, the film is stretched in a rolling equipment with three sets of rollers, and the speed ratio of the three sets of rollers is 1:1.1:1.15; at 300°C rolling, such as figure 1 As shown, tetraethyl orthosilicate is sprayed before the first set of rollers, supersaturated aqueous sodium bicarbonate solution is sprayed between the first set of rollers and the second set of rollers, and between the second set of rollers and the third set of rollers Spray 5mol / L ammonia water; the distance between the first group of rollers is 0.02mm, the distance between the second group of rollers is 0.015mm, and the distance between the third group of rollers is 0.01mm;

[0049] (2) Dry the stretched thermoplastic organic film in step (1), and then evenly spray a small amount of 0.07g / cm2 on its surface 2 Magnesium powder, folded and cut, is a thermoplastic organic...

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Abstract

The invention relates to the field of silicon-carbon composite films, in particular to a method for preparing a silicon-carbon composite film with good cycle performance. A method for preparing a lithium battery silicon-carbon composite film negative electrode includes the following steps: using a thermoplastic organic film as a raw material, stretching the film in a rolling device successively bythree groups of rollers with a rotation speed ratio of 1: 1.05 to 1.15: 1.15 to 1.25, and simultaneously spraying ethyl orthosilicate, sodium bicarbonate and ammonia water onto the rollers to form asilica layer; drying the film, then uniformly spraying a small amount of magnesium powder onto the surface of the film, and folding and cutting the film into 3 to 5 layers; carbonizing the film at a high temperature: keeping constant temperature for 28-36 minutes at 195-210 degrees centigrade, raising the temperature to 690-720 degrees centigrade and then keeping constant temperature for 1.9-2.5 hours, and then raising the temperature to 995-1100 degrees centigrade and carbonizing the film for 4.8-5 .5 hours with an Ar gas as a protective atmosphere; after high-temperature carbonization, obtaining the required composite film by acid pickling, water washing and drying in order. The method has a simple process and is suitable for large-scale industrial production, and the prepared silicon-embedded carbon film has good cycle performance.

Description

technical field [0001] The invention relates to the field of silicon-carbon composite films, in particular to a method for preparing a silicon-carbon composite film with good cycle performance. Background technique [0002] With the continuous advancement of lithium battery anode technology, the requirements for anode materials, electrolytes, diaphragms and other accessories have also increased. The application of traditional graphite anodes in lithium battery anodes has been unable to meet expectations, and its theoretical specific capacity of 372mah / g can no longer meet high Capacity lithium battery demand. In response to this problem, silicon anode materials have become the preferred choice for upgrading carbon-based anode materials due to their extremely high theoretical specific capacity, excellent chemical inertness, and extensive raw material sources. However, the lithium intercalation mechanism of pure silicon negative electrodes is different from that of carbon-bas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/1395H01M4/38H01M4/62H01M10/0525
CPCH01M4/1395H01M4/386H01M4/625H01M4/628H01M10/0525H01M2004/027Y02E60/10
Inventor 陈庆廖健淞
Owner 东营市东凯新材料技术研发有限责任公司
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