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A kind of silicon carbon film negative electrode with graphene as skeleton and preparation method thereof

A graphene skeleton and graphene technology, applied in the direction of negative electrodes, battery electrodes, active material electrodes, etc., can solve the problems of large volume change, low cycle life, and SEI film generation, and overcome the problems of silicon negative electrode materials. Convenience, the effect of a simple method

Active Publication Date: 2021-09-28
自贡兴川储能技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are problems with silicon anode materials such as low cycle life, large volume change, and continuous SEI film generation.

Method used

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  • A kind of silicon carbon film negative electrode with graphene as skeleton and preparation method thereof
  • A kind of silicon carbon film negative electrode with graphene as skeleton and preparation method thereof
  • A kind of silicon carbon film negative electrode with graphene as skeleton and preparation method thereof

Examples

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Embodiment 1

[0033] This embodiment discloses the preparation method of the silicon carbon thin film negative electrode with graphene as the skeleton of the present invention, and its process flow chart is as attached figure 1 As shown, specifically:

[0034] Step 1. Use radio frequency plasma enhanced chemical vapor deposition (RF-PECVD) to grow a vertical graphene framework on the substrate copper foil:

[0035] as attached figure 2 shown, with pure CH 4 As a reaction gas, a vertical graphene framework 202 is deposited on a clean substrate 201 . The operating conditions are: substrate temperature 400°C, gas CH 4 The flow rate is 50sccm, H 2 The flow rate is 500sccm, the pressure is 0.4mbar, and the deposition power is 50mW / cm 2 , the length of the prepared vertical graphene is about 500 nm.

[0036] Step 2. Plasma treatment of the grown vertical graphene skeleton:

[0037] Stop CH 4 , H 2 The flow rate is adjusted to 100sccm, and the RF power is adjusted to 20mW / cm 2 , process...

Embodiment 2

[0041] This example discloses the preparation method of the silicon-carbon thin film negative electrode with graphene as the skeleton of the present invention. Compared with Example 1, the carbon source of this example is ethylene, and the rest of the conditions are the same, and the amorphous silicon layer is prepared. The thickness is about 500nm.

Embodiment 3

[0043] This example discloses the preparation method of the silicon-carbon thin film negative electrode with graphene as the skeleton of the present invention. Compared with Example 1, the carbon source of this example is ethanol, and the rest of the conditions are the same, and the amorphous silicon layer is prepared. The thickness is about 500nm.

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Abstract

The invention discloses a silicon-carbon thin film negative electrode with graphene as a skeleton and a preparation method thereof, belonging to the field of lithium ion batteries. The preparation method of the present invention comprises the following steps: step 1. growing a vertical graphene skeleton on a substrate; step 2. carrying out plasma treatment to the vertical graphene skeleton of growth; step 3. the vertical graphite after being processed in step 2 Silicon materials grown on ene frameworks. The invention has scientific design, simple method and convenient operation. The invention creatively grows vertical graphene on the substrate first, and then grows silicon material on the vertical graphene skeleton, so that the loose silicon film can be embedded between the vertical graphene sheets to form a silicon-carbon negative electrode, which can be very good Overcome the problem of silicon anode materials, and can give full play to the in-plane conductivity of vertical graphene, and improve the efficiency of ion intercalation and extraction, which is of great significance for the preparation of large-capacity lithium-ion batteries, especially solid-state batteries.

Description

technical field [0001] The invention belongs to the field of lithium-ion batteries, and in particular relates to a silicon-carbon thin film negative electrode with graphene as a skeleton and a preparation method thereof. Background technique [0002] Lithium-ion batteries have been widely used in portable consumer electronics, power tools, medical electronics and other fields due to their excellent performance. At the same time, it also shows good application prospects in the fields of pure electric vehicles, hybrid vehicles, and energy storage. [0003] The current commercial lithium-ion batteries mainly use graphite as the negative electrode material. However, in recent years, the demand for battery energy density in various fields has increased rapidly, and there is an urgent need to develop lithium-ion batteries with higher energy density. Therefore, it is imminent to develop anode materials with higher energy density. [0004] The mass specific capacity of silicon ma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525
CPCH01M4/366H01M4/386H01M4/625H01M10/0525H01M2004/027Y02E60/10
Inventor 张悦刘曙光庞先标杨荣
Owner 自贡兴川储能技术有限公司
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