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Silicon-carbon film negative electrode taking graphene as skeleton and preparation method

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

Active Publication Date: 2020-11-20
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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  • Silicon-carbon film negative electrode taking graphene as skeleton and preparation method
  • Silicon-carbon film negative electrode taking graphene as skeleton and preparation method
  • Silicon-carbon film negative electrode taking graphene as skeleton and preparation method

Examples

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Comparison scheme
Effect test

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 film negative electrode taking graphene as a skeleton and a preparation method, and belongs to the field of lithium ion batteries. The preparation method provided in the invention comprises the following steps: 1, growing a vertical graphene skeleton on a substrate; 2, carrying out plasma treatment on the grown vertical graphene skeleton; and 3, growing a silicon material on the vertical graphene skeleton treated in the step 2. The negative electrode and the method are scientific in design, simple and convenient to operate. The method comprises the following steps: creatively growing vertical graphene on the substrate; and growing a silicon material on the vertical graphene skeleton. A silicon-carbon negative electrode can be formed by embedding a loose silicon film between vertical graphene sheet layers so that the problem of a silicon negative electrode material can be well solved, in-plane conductivity of the vertical graphene can be fully exerted, ion embedding and precipitation efficiency is improved, and the preparation method has important significance for preparing a high-capacity lithium ion battery, particularly a solid-state battery.

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 Applications(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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