Silicon-carbon-graphene electrode material of interlayer hollow double-shell structure and preparation method and application of silicon-carbon-graphene electrode material

A technology of graphene electrode and shell structure, which is applied in the direction of nanotechnology, negative electrode, and structural parts for materials and surface science, and can solve the problems of electrode material structure damage, electrode volume expansion, battery capacity attenuation, etc., and achieve preparation Low cost, excellent electrical conductivity, easy and stable control effect

Active Publication Date: 2020-02-21
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, during the process of lithium intercalation and delithiation of silicon-based electrodes, the volume of the electrode will expand by about 300%, which will lead to the destruction of the electrode material structure, peeling off, pulverization of the electrode, and a decrease in conductivity, thereby rapidly reducing the battery capacity.

Method used

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  • Silicon-carbon-graphene electrode material of interlayer hollow double-shell structure and preparation method and application of silicon-carbon-graphene electrode material
  • Silicon-carbon-graphene electrode material of interlayer hollow double-shell structure and preparation method and application of silicon-carbon-graphene electrode material
  • Silicon-carbon-graphene electrode material of interlayer hollow double-shell structure and preparation method and application of silicon-carbon-graphene electrode material

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Experimental program
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Effect test

Embodiment 1

[0034] 1. Preparation of silicon-carbon-graphene electrode material with sandwich hollow double shell structure

[0035] (1) Weigh 0.15 g of commercial nano-silicon particles, wash and wash off the natural oxide layer on the nano-silicon surface by 10 wt% hydrofluoric acid solution, and then vacuum-dry at 80° C. to 120° C. for 8-10 hours.

[0036] (2) Put the obtained dry nano-silicon sample into a tubular calciner for high-temperature heat treatment, raise the temperature to 650-850°C at 5°C / min, and pass 60 sccm of Ar gas as a protective gas during the process. After reaching the temperature point, change to 60sccm compressed air and keep warm for 20 minutes. Then it was cooled with the furnace, and 60 sccm of Ar gas was used as the shielding gas. Finally, a sample with a certain thickness of oxide layer SiOx on the surface of silicon particles was obtained.

[0037] (3) Add 0.1 g of silicon particles treated in step (2) above to 150 ml of 5 g / L polydiallyldimethylammonium...

Embodiment 2

[0051] Repeat the (1)-(5) steps of the above-mentioned embodiment 1, and change the (3) step. Add 0.1 g of the above-mentioned silicon particles treated in step (2) into 150 ml of 10 g / L polydiallyldimethylammonium chloride solution, perform ultrasonic treatment for 30 min, and then centrifuge. When centrifuging, use 10000r / min and keep for 12min. Other conditions were kept the same, and the Si@SiOx-void(750)@C@C / rGO sample was finally obtained, and the battery test was as follows Figure 7 As shown, the capacity remained at 1050mAh / g after 100 cycles, which was lower than the Si@SiOx-void(750)@C / rGO sample, so the concentration of polydiallyldimethylammonium chloride solution was obtained by using 5g / L Sample results are best.

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Abstract

The invention discloses a silicon-carbon-graphene electrode material of an interlayer hollow double-shell structure and a preparation method and application of the silicon-carbon-graphene electrode material. According to the invention, the material has the structure that silicon-carbon particles of an interlayer hollow double-shell structure are fixed to a redox graphene sheet layer, each silicon-carbon particle is provided with a nanometer silicon particle inner core, the surface of each nanometer silicon particle is wrapped with a SiOx layer, a carbon layer is arranged outside each SiOx layer, and a hollow layer is arranged between each SiOx layer and the corresponding carbon layer. The invention also provides an application and a preparation method of the silicon-carbon-graphene electrode material of the interlayer hollow double-shell structure in preparation of a lithium ion battery negative electrode material. The silicon-carbon-graphene electrode material of the interlayer hollowdouble-shell structure is high in reversible capacity, good in cycling stability, capable of achieving large-scale production and the like.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery negative electrode materials, and relates to a high-capacity, long-life, low-cost core-shell structure silicon-carbon-graphene electrode material with interlayer hollow double shells, and a preparation method and application thereof. Background technique [0002] With the emergence of emerging markets such as electric vehicles (EV) and hybrid electric vehicles (HEV), there is a huge demand for lithium-ion batteries (LIB). [0003] Commercial graphite is a widely used anode material for lithium-ion batteries due to its high structural stability and high capacity retention during charge-discharge cycles. However, the lower theoretical capacity (372mA h / g) of graphite restricts the further improvement of lithium battery capacity. Silicon is about 4200mAh / g due to its high theoretical capacity (Li 4.4 Si alloys), rich in resources, are expected to be adopted in next-generation lithium-ion batterie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/62H01M10/0525B82Y30/00B82Y40/00
CPCH01M4/386H01M4/628H01M4/625H01M10/0525B82Y30/00B82Y40/00H01M2004/027H01M2004/021Y02E60/10
Inventor 张耀朱超烨曲翊
Owner SOUTHEAST UNIV
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