Silicon-carbon composite assembled battery

A technology of silicon-carbon composite materials and combined batteries, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of active material falling off, battery cycle stability decline, structural collapse, etc., to achieve improved conductivity and excellent cycle performance , low cost effect

Inactive Publication Date: 2016-11-16
宁波嘉宁电池科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, under the condition of high degree of lithium desorption / intercalation, silicon materials have serious volume effect, which can easily cause structure collapse, active material falling off, and the cycle stability of the battery is greatly reduced.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The specific preparation steps of the combined battery of silicon-carbon composite material in this embodiment are as follows:

[0022] (1) Add silicon powder to a NaOH solution containing various mixtures with a mass ratio of less than 30%, after ultrasonic vibration, filter and dry to remove surface impurities and oxides of silicon; wherein, the mixture is sugar compound, high polymer , silicon powder and organic solvent, the mass ratio of the above sugar compound, high polymer, silicon powder and organic solvent is 1:1:0.5:5~1:0.1:0.1:0.5;

[0023] (2) citric acid is dissolved in absolute ethanol to make a citric acid / ethanol solution with a concentration of 0.4g / ml; the silicon powder processed in step 1 is added to the citric acid / ethanol solution in an amount of 2g / ml , After ultrasonic stirring for 30 minutes, the mixed solution was sprayed and cracked in the air at 400°C to obtain this product.

[0024] The high polymer in step (1) is selected from polyacrylami...

Embodiment 2

[0030] The specific preparation steps of the combined battery of silicon-carbon composite material in this embodiment are as follows:

[0031] (1) Add silicon powder to a NaOH solution containing various mixtures with a mass ratio of less than 30%, after ultrasonic vibration, filter and dry to remove surface impurities and oxides of silicon; wherein, the mixture is sugar compound, high polymer , silicon powder and organic solvent, the mass ratio of the above sugar compound, high polymer, silicon powder and organic solvent is 1:1:0.5:5~1:0.1:0.1:0.5;

[0032] (2) citric acid is dissolved in absolute ethanol to make a citric acid / ethanol solution with a concentration of 0.4g / ml; the silicon powder processed in step 1 is added to the citric acid / ethanol solution in an amount of 2g / ml , After ultrasonic stirring for 30 minutes, the mixed solution was sprayed and cracked in the air at 400°C to obtain this product.

[0033] The high polymer in step (1) is selected from polyacrylami...

Embodiment 3

[0039] The specific preparation steps of the combined battery of silicon-carbon composite material in this embodiment are as follows:

[0040] (1) Add silicon powder to a NaOH solution containing various mixtures with a mass ratio of less than 30%, after ultrasonic vibration, filter and dry to remove surface impurities and oxides of silicon; wherein, the mixture is sugar compound, polymer , silicon powder and organic solvent, the mass ratio of the above sugar compound, high polymer, silicon powder and organic solvent is 1:1:0.5:5~1:0.1:0.1:0.5;

[0041] (2) citric acid is dissolved in absolute ethanol to make a citric acid / ethanol solution with a concentration of 0.4g / ml; the silicon powder processed in step 1 is added to the citric acid / ethanol solution in an amount of 2g / ml , After ultrasonic stirring for 30 minutes, the mixed solution was sprayed and cracked in the air at 400°C to obtain this product.

[0042] The carbohydrate compound in step (1) is selected from monosacc...

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Abstract

The invention relates to a silicon-carbon composite assembled battery. The silicon-carbon composite assembled battery is prepared by steps: (1) adding silicon powder into NaOH solution containing various mixtures and being smaller than 30% in mass ratio, vibrating ultrasonically, filtering and drying to remove surface impurities and oxides of silicon, wherein the mixtures include carbohydrates, high polymers, silicon powder and organic solvents in a mass ratio of 1:1:0.5:5-1:0.1:0.1:0.5; (2) dissolving citric acid in absolute ethyl alcohol to obtain citric acid/ethanol solution with concentration being 0.4g/ml; adding the silicon powder processed at the step 1 into the citric acid/ethanol solution according to an addition quantity of 2g/ml, ultrasonically stirring for reaction for 30min, and subjecting the mixed solution to spray pyrolysis in air at 400 DEG C to obtain the silicon-carbon composite assembled battery. Easiness in raw material acquisition, low cost and simplicity in preparation are realized, and the prepared silicon-carbon composite is small and controllable in size.

Description

technical field [0001] The invention relates to a combined battery made of silicon-carbon composite materials, which belongs to the technical field of lithium batteries. Background technique [0002] Graphite anode materials have high cycle efficiency and good cycle performance, and have been widely used in the preparation of lithium-ion battery anode materials. However, its theoretical specific capacity is only 372mAh / g, so it is necessary to develop new negative electrode materials to improve the electrochemical performance of lithium-ion batteries. At present, silicon materials have become candidates for lithium-ion battery anode materials due to their advantages such as high capacity, abundant resources, and similar potential to carbon materials. However, the silicon material has a serious volume effect under the high degree of lithium desorption / intercalation, which is easy to cause the structure to collapse, the active material to fall off, and the cycle stability of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/587H01M4/62H01M10/0525
CPCH01M4/362H01M4/386H01M4/587H01M4/625H01M10/0525Y02E60/10
Inventor 王航
Owner 宁波嘉宁电池科技有限责任公司
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