Fabrication process of silicon-based electrode and its energy storage device

Abstract

The invention discloses an energy storage device, which includes a casing containing an electrolyte, a silicon-based electrode, a positive plate, and a separator, and the silicon-based electrode, the positive plate, and the separator are soaked in the electrolyte, and the separator is arranged on Between the silicon electrode and the positive plate. Wherein, the silicon-based electrode includes a conductive substrate, a silicon layer with an atom-doped layer on the surface is arranged on the conductive substrate, and an organic protective film layer is plated on the surface of the silicon layer with the atom-doped layer. Using a silicon-based electrode that has been surface modified and coated with an organic protective film layer as the negative electrode of the energy storage device can improve the Coulomb conversion efficiency and reduce the interface impedance, thereby increasing the service life of the storage system. In addition, the order of the atom-doped layer and the organic protective film layer can be replaced or combined.

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 degree of volume expansion has a great relationship with the particle size of silicon powder

Although Taiwan Invention Patent Publication No. 201421781 provides a recycling process from cutting waste to lithium battery raw materials, its example does not have much ink on the suppression of the formation of interface reactants and the surface treatment of pole pieces

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