Beijing University of Technology

Rongshi Xiao

Qiang Wu

Ting Huang

Jianglin Zou

Jiejie Xu

Wuxiong Yang

Mengya Cui

Provided is a method for laser additive manufacturing based on keyhole effects. A welding wire and a laser beam are arranged, at certain angles, on two sides of a normal line of a substrate respectively. The laser beam is applied on the welding wire to generate a deep penetration melting keyhole. The welding wire absorbs energy of the laser beam and is heated and melted in a deep penetration melting mode. The welding wire transmits energy to a surface of the substrate to form a cladding layer. The laser beam irradiates the surface of the substrate after passing through the welding wire, and preheats the surface of the substrate in a heat conduction mode.

Method and system for laser additive manufacturing based on keyhole effects

The present disclosure discloses a porous structure Si/Cu composite electrode of a lithium ion battery and a preparation method thereof. The composite electrode comprises an active substance, a bulk porous Cu and a current collector, wherein the active substance Si is embedded into the bulk porous Cu, and the bulk porous Cu is in metallurgical bonding with the current collector and plays a dual role of 'binder' and 'conductive agent', which not only relieves the pulverization and the shedding of the active substance Si particles but also improves electron transmission efficiency; and meanwhile, the porous structure increases the contact area between the active substance Si and electrolyte and increases the reaction efficiency of lithium insertion combination. The method of preparing the composite electrode comprises: with Si, Cu and Al powders as raw materials, preparing a Si&#x2014;Cu&#x2014;Al precursor alloy on the Cu current collector by powder metallurgy and diffusion welding technology; and removing Al element in the Si&#x2014;Cu&#x2014;Al precursor alloy by using a chemical de-alloying method to obtain a Si/Cu composite electrode with a porous-structure.

Porous structure Si Cu composite electrode of lithium ion battery and preparation method thereof

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Beijing, China

Rongshi Xiao