Preparation method of a three-dimensional hierarchical porous copper-zinc composite current collector

Abstract

The invention relates to the field of lithium ion battery anode materials, and in particular to a method for preparing a three-dimensional graded porous copper-zinc composite current collector. The preparation method comprises the following steps: 1) adsorbing a copper-containing waste liquid by wood powders, separating filter residues and a filtrate by filtration; 2) mixing mixed ambary powders,PMMA powders and the filter residues, and performing electrophoretic deposition at constant voltage, heat preservation and drying to obtain a template; 3) plating the template with copper and placingthe template in a special atmosphere for calcination for a period of time, stilly placing the template in an organic liquid for a period of time, and obtaining a three-dimensional graded porous coppersubstrate by washing and drying; and 4) putting the three-dimensional graded porous copper substrate in a galvanizing liquid, performing pulse plating to obtain the three-dimensional graded porous copper-zinc composite current collector. The method can obtain a graded porous template by doping PMMA, ambary powders and wood powders of different particle diameters, can provide a large space for deposition of lithium metal, can provide a large specific surface area, reduces local current density, and inhibits the accumulation of lithium dendrites during growth.

Description

technical field [0001] The invention relates to the field of negative electrode materials for lithium metal batteries, in particular to a method for preparing a three-dimensional hierarchical porous copper-zinc composite current collector. Background technique [0002] Lithium batteries are the primary power source for consumer electronics and are also being actively developed for electric vehicles and grid-scale energy storage. However, due to the limitation of electrode materials, the current commercial lithium-ion batteries have been difficult to meet the increasingly high performance requirements of the current energy storage market. [0003] Lithium metal batteries have a higher specific capacity (3860mAh g -1 ) and lower redox potential (-3.04V vs standard hydrogen electrode), have received great attention. Although the research started half a century ago, the growth and accumulation of lithium dendrites still exist during the cycling process of lithium metal batteri...

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Problems solved by technology

[0007] In order to solve the problem that the negative electrode material of the existing lithium metal battery has poor lithium ion deposition effect, and if a good lithium ion deposition effect is to be produced, the preparation cost of the negative electrode material is too high, that is, the performance and cost cannot be balanced, and the cost performance is low. Provided is a method for preparing a three-dimensional hierarchical porous copper-zinc composite current collector

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