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Graphene@egg yolk-eggshell silicon-carbon composite material as well as preparation and application thereof

A silicon-carbon composite material and silicon-carbon material technology, which is applied in the field of materials, can solve the problems of pollution, easy corrosion of elemental silicon particles, affecting the morphology of target products, etc., and achieve the effects of high Coulomb efficiency and long-cycle capacity retention rate.

Active Publication Date: 2021-02-09
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the use of excessive hydrofluoric acid in this method, it is easy to corrode the elemental silicon particles inside the material, affecting the morphology of the target product, and the SiF produced at the same time 4 Gas and HF acid wastewater cause serious pollution to air, water and soil

Method used

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  • Graphene@egg yolk-eggshell silicon-carbon composite material as well as preparation and application thereof
  • Graphene@egg yolk-eggshell silicon-carbon composite material as well as preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] (1) ultrasonically disperse graphite oxide in dilute hydrochloric acid solution with pH=1, the liquid-solid ratio is 700:1, and add silicon-based material (D50=400nm free Shaped nano-silicon), followed by ultrasonic treatment at 50°C, the ultrasonic power is 400W, the ultrasonic frequency is 100kHz, and the ultrasonic time is 1.5h, to obtain the mixed colloidal solution. Add FeCl 3 ·6H 2 O (amorphous nano-silicon and FeCl 3 ·6H 2 The ratio of O is 10:1), after mixing, while mechanically stirring, add ammonia water with a concentration of 25-28% dropwise until pH=10, and the precipitate obtained by centrifugation is washed with deionized water until the pH of the eluate is 7. Solid A was obtained after drying.

[0068] (2) Put the solid A and ferrocene in acetone, the mass ratio of the two solids is 1:1, the liquid-solid ratio is 20:1, ultrasonically treat at 50°C, and the ultrasonic power is 800W. The frequency is 300kHz, and the ultrasonic time is 4h to obtain a m...

Embodiment 2

[0074] (1) Supersonically disperse graphite oxide in dilute hydrochloric acid solution with pH=1, the liquid-solid ratio is 500:1, and add silicon-based material (D50=200nm free Shaped nano-silicon), followed by ultrasonic treatment at 25°C, the ultrasonic power is 200W, the ultrasonic frequency is 50kHz, and the ultrasonic time is 1.0h, to obtain the mixed colloidal solution. Add NiSO 4 ·6H 2 O (amorphous nano-silicon and NiCl 2 ·6H 2 The ratio of O is 5:1), after mixing, add 0.05mol / L NaOH solution dropwise while stirring mechanically, until pH = 8, and wash the precipitate obtained by centrifugation with deionized water until the pH of the eluate is 7 , A solid was obtained after drying.

[0075] (2) Put solid A and nickelocene in glycerol, the mass ratio of the two solids is 1:2, the liquid-solid ratio is 15:1, and ultrasonically treat at 25°C with the ultrasonic power of 600W , the ultrasonic frequency was 100kHz, and the ultrasonic time was 2h to obtain a mixed solu...

Embodiment 3

[0081] (1) Ultrasonic disperse graphite oxide in dilute hydrochloric acid solution with pH=1, the liquid-solid ratio is 200:1, and add silicon-based materials (SiO with D50=400nm) according to the mass ratio of silicon-based core and graphite oxide at 5:1 1.5 ), followed by ultrasonic treatment at 0°C, the ultrasonic power is 100W, the ultrasonic frequency is 10kHz, and the ultrasonic time is 0.5h, to obtain the mixed colloidal solution. Add MnCl 2 4H 2 O(SiO 1.5 and MnCl 2 4H 2The ratio of O is 1:1), after mixing, the ammonia water with a concentration of 25-28% is added dropwise while stirring mechanically until pH = 6, and the precipitate obtained by centrifugation is washed with deionized water until the pH of the eluate is 7 , A solid was obtained after drying.

[0082] (2) Place solid A and glucose in DMF, the mass ratio of the two solids is 1:4, the liquid-solid ratio is 10:1, and ultrasonically treated at 0°C, the ultrasonic power is 400W, and the ultrasonic frequ...

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Abstract

The invention belongs to the technical field of materials, and particularly relates to a graphene@egg yolk-eggshell silicon-carbon composite material which comprises graphene and an egg yolk-egg shellsilicon-carbon material loaded on the surface of the graphene. The egg yolk and eggshell silicon-carbon material is a composite material taking amorphous carbon as a shell and a silicon-based material as a core, and a gap exists between the shell and the core. The invention also provides a preparation method of the composite material and an application of the composite material in a lithium battery. The invention provides a brand-new composite material, and research finds that the composite material has excellent electrical properties in a lithium ion battery, such as high first-cycle coulombic efficiency and long-cycle capacity retention ratio.

Description

technical field [0001] The invention belongs to the field of material technology, and in particular relates to the preparation of a new graphene@egg yolk-eggshell silicon-carbon composite material. Background technique [0002] Lithium-ion batteries (LIB) have been widely used in 3C digital products and new energy vehicles due to their advantages such as high specific energy, wide operating temperature range and no memory effect. At the same time, the capacity and energy density of batteries are also in urgent need of improvement. The theoretical specific capacity of traditional lithium-ion battery graphite negative electrode is only 372mAh / g, which cannot meet the market demand. Recently, silicon-based (theoretical specific capacity 4200mAh / g) and tin-based (theoretical specific capacity 990mAh / g) materials have become research hotspots due to their high specific capacity, especially silicon-based materials. However, due to the huge volume expansion and contraction during ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525
CPCH01M4/366H01M4/386H01M4/625H01M10/0525Y02E60/10
Inventor 田忠良赖延清李松贤罗飞林李劼
Owner CENT SOUTH UNIV
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