Nano silicon/carbon composite material, preparation method and lithium ion battery containing nano silicon/carbon composite material as negative electrode material

A carbon composite material and nano-silicon technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as large expansion, poor material bonding force, and uneven coating of carbon-coated silicon.

Inactive Publication Date: 2018-08-31
BTR NEW MATERIAL GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Conventional solid-phase method, liquid-phase method, and impregnation method to form carbon coating can reduce the side reaction between silicon and electrolyte to a certain extent, and at the same time inhibit volume...

Method used

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  • Nano silicon/carbon composite material, preparation method and lithium ion battery containing nano silicon/carbon composite material as negative electrode material
  • Nano silicon/carbon composite material, preparation method and lithium ion battery containing nano silicon/carbon composite material as negative electrode material
  • Nano silicon/carbon composite material, preparation method and lithium ion battery containing nano silicon/carbon composite material as negative electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0078] (1) 0.5 g of nano-silicon with a median particle size of 50 nm, 0.025 g of vinyl triethoxy silane, and 0.1 g of 1,3-butadiene are sequentially added to 10 ml of styrene, and the mixture is uniformly stirred to obtain a mixture.

[0079] (2) Add 80ml of distilled water, 0.25g of sodium lauryl sulfate, 0.06g of isohexadecane and 0.02g of ammonium persulfate to the above mixture and stir to obtain an emulsion. The emulsion is homogenized by a high-pressure homogenizer. After melting, transfer to a 200ml three-necked flask equipped with reflux condenser, magnetic stirrer, thermometer and nitrogen passage to raise the temperature to 85°C, react for 2h-3h, cool to complete the reaction.

[0080] (3) After demulsification, washing and drying of the resulting emulsion, a powdery solid is obtained. Finally, the powder is prevented from being heated in a graphite crucible at 2.0°C / min to 1000°C under a nitrogen atmosphere, kept for 3h, and naturally cooled to room temperature. The hig...

Embodiment 2

[0086] (1) 0.4g of nano-silicon with a median particle size of 50nm, 0.025g of vinyltriethoxysilane, and 0.1g of 1,3-butadiene were sequentially added to 15ml of styrene, and stirred to obtain a mixture.

[0087] (2) Add 80ml of distilled water, 0.25g of sodium lauryl sulfate, 0.06g of isohexadecane and 0.02g of ammonium persulfate to the above mixture and stir to obtain an emulsion. The emulsion is homogenized by a high-pressure homogenizer Then, transfer to a 200ml three-necked flask equipped with a reflux condenser, a magnetic stirrer, a thermometer and a nitrogen passage, and raise the temperature to 85°C. After reacting for 2h-3h, cool to complete the reaction.

[0088] (3) After demulsification, washing and drying of the resulting emulsion, a powdery solid is obtained. Finally, the powder is prevented from being heated in a graphite crucible at 2.0°C / min to 1000°C under a nitrogen atmosphere, kept for 3h, and naturally cooled to room temperature. The high-temperature product ...

Embodiment 3

[0090] The preparation method is the same as that of Example 1, the difference is: the mass of commercial nano silicon is changed to 0.6 g, the volume of styrene is changed to 8 ml, and the obtained test results are shown in Table 1.

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Abstract

The invention discloses a nano silicon/carbon composite material, a preparation method and a lithium ion battery comprising the same as a negative electrode material. The method comprises: 1) mixing nano silicon, a coupling agent, a conjugated diene, and an olefin monomer; 2) mixing the resulting mixture with water, an emulsifier, an initiator, and a co-surfactant, using a microemulsification method to prepare microemulsion, and using a microemulsion polymerization method to form a crosslinked polymer wrapping material on the surface of the nano silicon; and 3) performing demulsification and carbonization to obtain the nano silicon/carbon composite material. In the nano silicon/carbon composite material, a nano-silicon core and an amorphous conductive carbon layer are very tight and stableto combine, the disadvantages that a general carbon layer and a silicon material are not uniformly wrapped and not tightly combined are solved, the volume expansion of the silicon material during thecycle is suppressed, and the battery prepared from the composite material has excellent cycle performance, and has excellent rate performance and low volume expansion effect.

Description

Technical field [0001] The invention belongs to the application field of lithium ion battery negative electrode materials, and relates to a nano silicon-based composite material, a preparation method and application, and in particular to a nano silicon / carbon composite material, a preparation method and a lithium ion battery containing it as a negative electrode material. Background technique [0002] Lithium-ion batteries have been widely used in mobile terminals, digital products and portable mobile devices, electric vehicles and energy storage power stations because of their outstanding advantages such as high voltage, long cycle life, good safety performance, and fast charging. However, as the requirements for environmental protection and energy conservation have become more stringent, the new energy vehicle market has developed rapidly. At present, it is difficult for lithium-ion batteries to meet the long-term endurance requirements of new energy vehicles. Therefore, the dev...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M10/0525
CPCH01M4/362H01M10/0525Y02E60/10
Inventor 李晓栋何鹏任建国黄友元岳敏
Owner BTR NEW MATERIAL GRP CO LTD
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