Manufacturing method of silicon electrode for lithium ion battery based on selective melting technology

Abstract

The invention provides a method for manufacturing a silicon electrode of a lithium-ion battery based on a selective melting technology. Active material silicon of the electrode is bonded to a copper current collector in a metallurgical manner and the bonding strength is high; and a large number of holes exist in the surface of the silicon electrode, so that the space is reserved for volume expansion of silicon, meanwhile, the contact area of lithium ions and the active material is increased and the specific capacity and the cycle performance of the lithium-ion battery are improved. The methodfor manufacturing the electrode comprises the steps of uniformly arranging aluminum-silicon powder on the copper current collector in advance; cladding the aluminum-silicon powder by using the selective laser melting technology to prepare an electrode precursor; and removing an aluminum element from a precursor alloy by using a de-alloying technology and obtaining a porous silicon structure bondedto the current collector in a metallurgical manner, thereby achieving structurization of an electrode material. The manufacturing method is mature and simple in technology and the cost is reduced.

Description

technical field [0001] This technology relates to the field of lithium-ion battery anode materials and advanced laser manufacturing. Specifically, it is a lithium-ion battery electrode manufacturing technology that uses a composite dealloying process using selective laser melting technology to prepare a porous silicon structure on a copper current collector. Background technique [0002] Lithium-ion batteries have the advantages of high discharge specific capacity, long cycle life, no memory effect, safety and pollution-free in the process of charging and discharging, and have become the main carrier of energy storage and conversion. Its development trend is to increase the energy density of batteries and reduce the volume of batteries , reduce the load on the environment. [0003] Electrodes are the core components of lithium-ion batteries, including positive and negative electrodes. Commonly used negative electrode materials include silicon-based, carbon-based and other m...

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Problems solved by technology

[Non-Patent Document 4: Qin, Y. et al. Anovel Si film with Si nanocrystals embedded inamorphous matrix on Cu foil as anode for lithium ion batteries. Materials Letters 138, 104-106, doi: 10.1016 / j.matlet.2014.09.101(2015 )] In the above method, silicon and current collector are mechanically combined, and cracks are prone to appear on the surface of the electrode, and the volume expansion of silicon can easily lead to electrode failure

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