Production method of porous copper micron hollow sphere current collector

Abstract

The invention provides a production method of a porous copper micron hollow sphere current collector. The production method specifically comprises a preparation method of a porous copper micron hollow sphere and a preparation method of a current collector. The preparation method of the porous copper micron hollow sphere is a wet chemical method, and specifically, a zinc micron sphere or a zinc oxide micron sphere is adopted as a self-sacrifice template to obtain a porous hollow structure. The preparation method of the current collector is a physical method, and specifically adopts liquid-phase coating, high-temperature sintering, spin coating, silk-screen printing, 3D printing and the like. According to the preparation method of the micron-sized porous copper micron hollow sphere, lithium metal can be fully contained in the porous copper micron hollow sphere, and the loading capacity of the lithium metal is increased. According to the copper micron hollow sphere current collector with the three-dimensional porous structure obtained through the method, the mass of the three-dimensional copper current collector is greatly reduced, stress in the lithium deposition process is released, lithium metal can be contained in pores of the porous copper micron hollow spheres, the loading capacity of the lithium metal is continuously increased, and growth of lithium dendrites is effectively inhibited.

Description

technical field [0001] The invention relates to a production method of a porous copper micron hollow ball current collector, belonging to the technical field of energy storage batteries. Background technique [0002] Copper has abundant reserves, low price, and excellent electrical conductivity. It is difficult to form a lithium-copper alloy with lithium at a low potential. This lithium-copper alloy is currently one of the most ideal lithium metal anode current collector materials. The traditional negative electrode current collector is copper foil, but the flat copper foil as the negative electrode current collector is prone to large local current due to its small specific surface area, which increases the probability of lithium dendrites during the battery cycle, resulting in short circuit of the battery, and the density of copper However, the current collector is an inactive material and does not contribute to the energy of the battery, which will affect the life, safety ...

AI Technical Summary

Problems solved by technology

The traditional negative electrode current collector is copper foil, but as a negative electrode current collector, flat copper foil is prone to large local current due to its small specific surface area, which increases the probability of lithium dendrites appearing during the battery cycle, causing a short circuit in the battery, and the density of copper Large, and the current collector is an inactive material that does not contribute to the energy of the battery, which will affect the life, safety and energy density of lithium batteries

Although the three-dimensional porous copper current collector can solve the key problems of lithium metal batteries (LMBs), due to the copper (8.960g cm -3 ) density is much higher than lithium (0.534gcm -3 ), and it is an inactive material, which does not provide any capacity but occupies a certain volume and mass, which seriously hinders the improvement of the battery's mass specific capacity and volume specific capacity. urgent problems to be solved

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