Silicon-based electrode production process and energy storage device

Abstract

The present invention discloses an energy storage device, which comprises a housing accommodating an electrolyte, a silicon-based electrode, a positive electrode plate, and a separation membrane, wherein the silicon-based electrode, the positive electrode plate, and the separation membrane are impregnated in the electrolyte, the separation membrane is arranged between the silicon-based electrode and the positive electrode plate, and the silicon-based electrode comprises an electric conduction base plate, a silicon layer provided with an atom doping layer on the surface and arranged on the electric conduction base plate, and an organic protection film layer plating and covering on the surface of the silicon layer having the atom doping layer. With application of the silicon-based electrode being subjected to the surface reforming treatment and plated with the organic protection film layer as the negative electrode of the energy storage device, the coulomb conversion efficiency can be increased, and the interface resistance can be reduced, such that the service life of the storage system can be increased. In addition, the sequence of the atom doping layer and the organic protection film layer can be replaced or the combination of the atom doping layer and the organic protection film layer can be adopted.

Description

technical field [0001] The invention relates to a manufacturing process of a silicon-based electrode, in particular to a silicon-based electrode applied to an energy storage device. Background technique [0002] Lithium battery energy storage devices have been widely used in portable electronic products and electric vehicles in recent years due to their advantages of being more environmentally friendly, lower cost, and higher energy density. Among them, the anode materials of commercial lithium-ion batteries are mostly carbon-based materials, such as natural graphite, artificial graphite and pitch. Although carbon-based materials have good stability and safety, their theoretical capacitance is only 372mAh / g. With the development of the electronic market towards thinner and smaller, carbon-based materials have gradually failed to meet the high capacity requirements of today's lithium-atom batteries. . Therefore, a silicon-based negative electrode with a theoretical capacita...

AI Technical Summary

Problems solved by technology

However, if you want to use silicon as the negative electrode material of lithium-ion batteries, there are still several problems to be overcome: (1) volume expansion: the high energy density of silicon-based batteries, because lithium ions form lithium silicon with silicon when charging. alloy, the volume will expand to three to four times the original volume, and the...

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