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Porous silicon/carbon shell composite material and preparation method and application thereof

A composite material, porous silicon technology, applied in the direction of active material electrodes, structural parts, electrical components, etc., can solve problems such as few electron and lithium ion transport sites, poor rate performance, and inability to achieve rapid charge transport.

Active Publication Date: 2019-12-10
浙江锂宸新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This structure has excellent cycle stability, but the outer diameter of the silicon particles designed in this structure is much smaller than the inner diameter of the carbon shell, and the silicon as the "egg yolk" can only maintain a single point of contact with the carbon layer as the "eggshell", electrons and lithium Too few ion transport sites for fast charge transport, resulting in poor rate performance

Method used

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  • Porous silicon/carbon shell composite material and preparation method and application thereof
  • Porous silicon/carbon shell composite material and preparation method and application thereof
  • Porous silicon/carbon shell composite material and preparation method and application thereof

Examples

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Embodiment 1

[0049] 1) Dissolve 1g of phenolic resin (Aladdin) in 100mL of toluene, and then disperse magnesium silicide powder in the solution. The mass ratio of magnesium silicide and phenolic resin is 10:1. After stirring evenly, the toluene was completely evaporated to dryness at 120° C. to obtain a mixture of magnesium silicide / phenolic resin.

[0050] 2) The mixture obtained in step 1) was heat-treated under a nitrogen atmosphere at a temperature of 700° C. for 10 h.

[0051] 3) The product obtained in step 2) is subjected to pickling treatment. Pickling is carried out with excess dilute hydrochloric acid. The concentration of dilute hydrochloric acid is 1mol / L. After cleaning, it is washed 5 times with deionized water, and then dried to form a composite material of porous silicon / carbon shell.

[0052] After testing, the particle size of the porous silicon / carbon shell composite material prepared in this embodiment is 1-5 μm, the thickness of the carbon layer is about 12-15 nm, and...

Embodiment 2

[0056] The same raw materials and preparation process as in Example 1 were used, the only difference being that the mass ratio of magnesium silicide to phenolic resin was 5:1.

[0057] Through Raman test, the porous silicon / carbon shell composite material prepared in this embodiment, the ratio I of amorphous carbon peak and graphitized carbon peak D / I G is 0.99.

Embodiment 3

[0059] The same raw materials and preparation process as in Example 1 were used, the only difference being that the mass ratio of magnesium silicide to phenolic resin was 1:1.

[0060] Through Raman test, the porous silicon / carbon shell composite material prepared in this embodiment, the ratio I of amorphous carbon peak and graphitized carbon peak D / I G is 1.06.

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Abstract

The invention discloses a porous silicon / carbon shell composite material and a preparation method thereof. The porous silicon / carbon shell composite material comprises a porous silicon core and a carbon shell, wherein the outer wall of the porous silicon core is attached to the inner wall of the carbon shell, and discrete pores are maintained between the outer wall of the porous silicon core and the inner wall of the carbon shell. The preparation method of the porous silicon / carbon shell composite material comprises the steps of 1) mixing magnesium silicide, a carbon source and an organic solvent, uniformly dispersing, and heating until the organic solvent is completely volatilized to obtain an intermediate product; and 2) carrying out heat treatment on the intermediate product prepared inthe step 1) in a nitrogen atmosphere, and carrying out post-treatment to obtain the porous silicon / carbon shell composite material. The invention discloses a porous silicon / carbon shell composite material with a novel structure and a preparation method of the porous silicon / carbon shell composite material. The porous silicon / carbon shell composite material has excellent rate performance and cycleperformance and is expected to be widely applied to the field of lithium ion batteries.

Description

technical field [0001] The invention relates to the technical field of composite materials, in particular to a porous silicon / carbon shell composite material and its preparation method and application. Background technique [0002] Lithium-ion batteries are currently the most important rechargeable batteries, which are widely used in consumer electronics such as mobile phones and notebook computers, pure electric vehicles and hybrid vehicles, and various other military and aerospace fields. Although lithium-ion batteries have been widely used in these fields, with the rapid development of these industries, it is increasingly difficult for current lithium-ion batteries to meet their performance requirements. Especially in the field of electric vehicles and electronic consumption, people urgently hope for batteries with smaller weight and volume and higher energy density, that is, batteries with higher specific capacity. [0003] In order to prepare a lithium-ion battery with...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525
CPCH01M4/366H01M4/386H01M4/625H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 张亚光杜宁林扬帆
Owner 浙江锂宸新材料科技有限公司
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