Micron-sized lamellar Si/SiO2 composite material as well as preparation method and application of micron-sized lamellar Si/SiO2 composite material

A composite material, micron-scale technology, applied in the direction of active material electrodes, structural parts, electrical components, etc., can solve the problems of expensive raw materials, equipment, high overall product cost, unfavorable industrial production, etc., to achieve simple equipment, strong repeatability, Ease of preparation

Pending Publication Date: 2022-03-04
陕西榆能集团能源化工研究院有限公司 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the silicon-based negative electrode materials disclosed above have certain improvements in improving the electrochemical performance of lithium-ion batteries, the raw materials and e

Method used

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  • Micron-sized lamellar Si/SiO2 composite material as well as preparation method and application of micron-sized lamellar Si/SiO2 composite material
  • Micron-sized lamellar Si/SiO2 composite material as well as preparation method and application of micron-sized lamellar Si/SiO2 composite material
  • Micron-sized lamellar Si/SiO2 composite material as well as preparation method and application of micron-sized lamellar Si/SiO2 composite material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Weigh 1.0 g of kaolin, ammonium chloride and aluminum powder and mix, add 5 mL of absolute ethanol, grind for 0.1 hour, and vacuum dry to obtain the precursor. The precursor was calcined under argon at 600°C for 1 hour, then pickled, washed with water, and dried in vacuum; the final product was obtained after secondary acid treatment with hydrofluoric acid for 0.1 hour, washed, and dried.

[0031] see figure 1 , figure 1 Micron-scale lamellar Si / SiO prepared for the present invention 2 The XRD pattern of the composite material, from which the phase composition can be determined as Si and SiO 2 , the product has high purity and no other impurity phases.

[0032] see figure 2 , figure 2 Be the scanning electron micrograph of embodiment 1 product, wherein the Si / SiO that makes 2 The morphology of the composite material is distinct, in the form of micron-scale flakes, with a product size of 2 μm and a thickness of 100 nm, and particles scattered on the surface that ...

Embodiment 2

[0036] Weigh 1.0 g, 1.0 g, and 3.0 g of kaolin, ammonium chloride, and aluminum powder, mix them, add 10 mL of absolute ethanol, grind for 0.5 hours, and vacuum dry to obtain a precursor. The precursor was calcined at 700°C under nitrogen for 1 hour, pickled, washed with water, and dried in vacuum; the final product was obtained after secondary acid treatment with hydrofluoric acid for 1 hour, washed, and dried.

Embodiment 3

[0038] Weigh 1.0 g, 3.0 g, and 1.0 g of kaolin, ammonium chloride, and aluminum powder, mix them, add 5 mL of absolute ethanol, grind for 0.3 hours, and vacuum dry to obtain a precursor. The precursor was calcined at 500°C under argon for 0.5 hours, pickled, washed with water, and dried in vacuum; the final product was obtained after secondary acid treatment with hydrofluoric acid for 0.3 hours, washed, and dried.

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Abstract

The invention discloses a micron-sized lamellar Si/SiO2 composite material as well as a preparation method and application thereof, and belongs to the field of synthesis of micro-nano materials. The used silicon-containing substance is an industrial silicon source which is cheap and easy to obtain and is mixed with sodium chloride and magnesium powder in proportion, a proper amount of absolute ethyl alcohol is added, grinding is performed, and a precursor is obtained after vacuum drying. And calcining the precursor at 500-700 DEG C, carrying out acid treatment, washing, and drying to obtain the micron-sized lamellar Si/SiO2 composite material. The method is low in raw material price, simple in process equipment, low in overall energy consumption and suitable for industrial production. According to the preparation method disclosed by the invention, the component proportion of the Si/SiO2 composite material can be regulated and controlled by changing reaction parameters, and the prepared Si/SiO2 composite material has distinct morphological characteristics and is in a micron-scale lamellar shape. As a battery negative electrode material, the material has relatively good electrochemical performance.

Description

technical field [0001] The invention belongs to the field of synthesis of micro-nano materials, in particular to a micron-scale lamellar Si / SiO 2 Composite materials, preparation methods and their applications. Background technique [0002] Silicon-based anode materials have high theoretical specific capacity and are currently one of the most promising anode materials for lithium-ion batteries. However, the large volume change of the silicon-lithium alloy leads to the fragile structure of the electrode material and the rapid decay of the battery capacity. The current main solutions include doping and carbon material compounding. In addition, the nano-silicon can reduce the stress damage caused by the volume change of the electrode material, which is also an effective improvement method. [0003] For example, in Chinese patent CN201910071365.6, a phosphorus source is added to nano silicon ethanol slurry, calcined at 750-1050°C, and then etched with a hydrofluoric acid solut...

Claims

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Application Information

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IPC IPC(8): H01M4/38H01M4/36H01M10/0525
CPCH01M4/386H01M4/366H01M10/0525H01M2004/027Y02E60/10
Inventor 郭守武高生辉张利锋阮欢高春云王亚军高峰郝巧娥王凤
Owner 陕西榆能集团能源化工研究院有限公司
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