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

Patent metadata

Field	Value
Publication number	US-11063264-B2
Application number	US-201916428100-A
Country	US
Kind code	B2
Filing date	May 31, 2019
Priority date	Mar 24, 2017
Publication date	Jul 13, 2021
Grant date	Jul 13, 2021

Abstract

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—Cu—Al precursor alloy on the Cu current collector by powder metallurgy and diffusion welding technology; and removing Al element in the Si—Cu—Al precursor alloy by using a chemical de-alloying method to obtain a Si/Cu composite electrode with a porous-structure.

First claim

The invention claimed is:

1. A method for preparing a porous electrode, comprising:
mixing powders of Si, Cu and Al to form a Si/Cu/Al material;
performing a compression-moulding step on the Si/Cu/Al material;
performing a sintering and diffusion welding step by pressing the compression-moulded Si/Cu/Al material and a Cu current collector together and putting the compression-moulded Si/Cu/Al material and the Cu current collector into a vacuum furnace to form a Si—Cu—Al precurs…

Assignees

• Univ Beijing Technology

Inventors

• Huang Ting
• Cui Mengya
• Xiao Rongshi
• Yang Wuxiong
• Wu Qiang

Classifications

• B22F1/06

  Operations & Transport · mapped topic

• C22C1/0425

  Chemistry & Metallurgy · mapped topic

• H01M4/0492

  Electricity · mapped topic

• H01M4/621

  Electricity · mapped topic

• H01M4/043

  Electricity · mapped topic