Interconnected flexible nano silicon composite powder as well as preparation method and application thereof

A composite powder, interconnected and flexible technology, applied in the direction of nanotechnology, nanotechnology, nanotechnology, etc. for materials and surface science, can solve problems such as poor cycle stability and poor electrical conductivity, and achieve improved negative electrode capacity and improved Effects of electrochemical cycle stability, improved conductivity, and structural stability

Pending Publication Date: 2022-06-03
SONGSHAN LAKE MATERIALS LAB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of this application is to provide an interconnected flexible nano-silicon composite powder and its preparation method and application, which aims to improve the technical problems of poor cycle stability and poor electrical conductivity of silicon used as a negative electrode material for lithium-ion batteries

Method used

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  • Interconnected flexible nano silicon composite powder as well as preparation method and application thereof
  • Interconnected flexible nano silicon composite powder as well as preparation method and application thereof
  • Interconnected flexible nano silicon composite powder as well as preparation method and application thereof

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preparation example Construction

[0041] The present application also provides a method for preparing the above-mentioned interconnected flexible nano-silicon composite powder, which includes first preparing a composite matrix, and then forming a graphene layer with vertical graphene sheets on the surface of the composite matrix. Specifically, the preparation method of the interconnected and flexible nano-silicon composite powder includes: firstly mixing nano-scale silicon powder, micro-scale graphite powder and nano-scale carbon material to prepare a composite matrix; graphene sheets.

[0042] The vertical graphene sheets prepared by chemical vapor deposition have good crystallinity, which is beneficial to improve the conductivity and flexibility of the graphite layer.

[0043] In the embodiment of the present application, the step of preparing the composite matrix includes: dissolving nano-scale silicon powder, micro-scale graphite powder, nano-scale carbon material and dispersant in a solution, mixing unifo...

Embodiment 1

[0062] This embodiment provides an interconnected flexible nano-silicon composite powder and a preparation method thereof, comprising the following steps:

[0063] (1) 50g of silicon powder with D50 of 50nm, 24g of carbon nanotubes with D50 of 10nm, 1g of graphene powder with D50 of 10μm, 510g of graphite powder with D50 of 15μm and 14g of polyvinylpyrrolidone were added to 2000ml in anhydrous ethanol, stir and disperse evenly and then dry to obtain a composite matrix;

[0064] (2) placing the composite matrix obtained in step (1) in a tube furnace, and heating up to 1050°C at 10°C / min under an argon protective atmosphere;

[0065](3) under the temperature condition of step (2), pass methane at 20mL / min and pass hydrogen at 80mL / min, close the protective gas, keep the temperature for 4h, close the methane and hydrogen, open the protective gas, and then naturally cool to room temperature to obtain Interconnected flexible nano-silicon composite powder.

Embodiment 2

[0067] This embodiment provides an interconnected flexible nano-silicon composite powder and a preparation method thereof, comprising the following steps:

[0068] (1) Add 50g of silicon powder with D50 of 30nm, 16g of carbon nanotubes with D50 of 10nm, 110g of graphite powder with D50 of 15μm and 10g of citric acid into 800ml of absolute ethanol, stir and disperse evenly and then bake dry to obtain a composite matrix;

[0069] (2) placing the composite matrix obtained in step (1) in a tube furnace, and heating up to 1000°C at 10°C / min under an argon protective atmosphere;

[0070] (3) under the temperature condition of step (2), pass methane at 20mL / min and pass hydrogen at 40mL / min, close the protective gas, keep the temperature for 3h, close the methane and hydrogen, open the protective gas, and then naturally cool to room temperature to obtain Interconnected flexible nano-silicon composite powder.

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Abstract

The invention relates to the technical field of lithium ion batteries, in particular to interconnected flexible nano silicon composite powder as well as a preparation method and application thereof. The interconnected flexible nano-silicon composite powder comprises a composite matrix and a graphene layer covering the surface of the composite matrix, the composite matrix comprises nano-scale silicon powder, micron-scale graphite powder and a nano-scale carbon material; the nanoscale carbon material comprises a carbon nanotube and / or graphene powder; the graphene layer comprises a plurality of vertical graphene sheets, and the surfaces of the nano-scale silicon powder, the micron-scale graphite powder and the nano-scale carbon material are all connected with the plurality of vertical graphene sheets. The interconnected flexible nano silicon composite powder provided by the invention is stable in structure, has the advantages of excellent negative electrode capacity, initial charge-discharge efficiency, rate capability, electrochemical cycle stability, conductivity, low expansion rate and the like, and has a wide application prospect in the field of lithium batteries.

Description

technical field [0001] The present application relates to the technical field of lithium ion batteries, and in particular, to an interconnected and flexible nano-silicon composite powder and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries are widely used in power batteries, consumer electronics and energy storage due to their high energy density, power density, small size and long service life. With the urgent demand for higher energy density lithium-ion batteries in various fields, the ultra-high theoretical specific anode capacity of up to 4200mAh / g, lower lithium-deintercalation potential (<0.5V), and lower electrolyte are usually used. Silicon materials with good reactivity and safety are used as anode materials for lithium-ion batteries. [0003] However, the volume effect of silicon material during lithium deintercalation will cause the pulverization of the negative electrode material and the destruction of the pole...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/583H01M4/62H01M10/0525B82Y30/00B82Y40/00
CPCH01M4/364H01M4/366H01M4/386H01M4/583H01M4/625H01M10/0525B82Y30/00B82Y40/00H01M2004/027Y02E60/10
Inventor 于杰夏振宇苑甫王恩哥
Owner SONGSHAN LAKE MATERIALS LAB
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