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Silicon-tin-graphene compound electrode material as well as preparation method and application thereof

An electrode material and composite technology, which is applied in the field of silicon-tin-graphene composite electrode material and its preparation, can solve the problems such as the cycle stability and electrical conductivity of silicon carbon negative electrode material need to be further improved, so as to improve the cycle stability. , The effect of inhibiting powdering and accelerating transmission

Active Publication Date: 2020-03-27
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the cycle stability and electrical conductivity of this silicon-carbon anode material still need to be further improved.

Method used

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  • Silicon-tin-graphene compound electrode material as well as preparation method and application thereof
  • Silicon-tin-graphene compound electrode material as well as preparation method and application thereof
  • Silicon-tin-graphene compound electrode material as well as preparation method and application thereof

Examples

Experimental program
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Embodiment

[0028] 1. Preparation of silicon-tin-graphene (Si-Sn / rGO) composite electrode material

[0029] (1) Weigh 0.1275g of commercial nano-silicon particles, and add them to SnCl with concentrations of 0.015mol / L, 0.032mol / L, and 0.077mol / L 4 In the solution, the volume of the solution is 6mL. After ultrasonication for 60min, it is vacuum-dried at 80°C for 10h; the obtained dried sample is placed in a tubular calciner for high-temperature heat treatment, and the temperature is raised to 350°C at a rate of 5°C / min, and kept for 1h. During the hydrogenation reduction process, 20 sccm of H was introduced into the whole process. 2 And the Ar mixed gas of 40sccm, finally cool to room temperature with furnace, obtain silicon-tin (Si-Sn) compound;

[0030] (2) Weigh 2.149g of commercial polydiallyldimethylammonium chloride solution, 0.363g of trishydroxymethylaminomethane, and 0.173g of sodium chloride, and add them to 150mL of deionized water to configure polydiallyldimethylammonium chlo...

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Abstract

The invention discloses a silicon-tin-graphene compound electrode material which comprises silicon particles, tin particles and a graphene sheet layer. The silicon particles and the tin particles areloaded on the graphene sheet layer at the same time, the particle size of the silicon particles is 20-60 nm, the particle size of the tin particles is 50-100 nm, and tin accounts for 5%-50% of the mass fraction of silicon-tin. The invention also discloses a preparation method of the compound electrode material and an application of the compound electrode material in a lithium ion battery negativeelectrode. The silicon-tin particles are modified on the surface of a redox graphene sheet layer, and the tin particles are next to the silicon particles, so that the effective support is provided forthe shrinkage and expansion of the silicon particles in the lithium intercalation and deintercalation process, the pulverization of the silicon particles is inhibited, and the cycling stability of the silicon-based electrode is improved. Even if the silicon particles are broken, the tin particles can provide the electric contact for silicon on the surface of the silicon, so that the conductivityis improved. The silicon-tin-graphene compound electrode material provided by the invention is high in energy density, high in reversible capacity, good in cycling stability and excellent in conductivity.

Description

technical field [0001] The invention relates to a lithium ion battery negative electrode material and a preparation method thereof, in particular to a silicon-tin-graphene composite electrode material and a preparation method and application thereof. Background technique [0002] With the emerging market of electric vehicles (EVs), there is a huge demand for lithium-ion batteries (LIBs). At present, the commercial anode materials are mainly graphite carbon-based carbon materials, which are widely used because of their high conductivity and strong cycle stability. However, the maximum theoretical specific capacity of graphite carbon materials is only 372mAh / g, which cannot meet further demands. Silicon is considered as the most promising electrode material with a theoretical capacity of up to 4200mAh / g (reversibly reacts with Li to form various Si-Li alloys and eventually Li 4.4 Si alloy), and is rich in resources on the earth. In addition, the lithiation platform voltage ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/583H01M10/0525C01B32/182
CPCH01M4/387H01M4/386H01M4/583H01M4/362H01M10/0525C01B32/182Y02E60/10
Inventor 张耀朱超烨曲翊
Owner SOUTHEAST UNIV
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