Magnesium alloy for negative electrode of battery

Abstract

The invention discloses a magnesium alloy for a negative electrode of a battery. The magnesium alloy is prepared from the following components: 1.5wt%-2.2wt% of Zn, 1.2wt%-2.0% of Cu, 0.5wt%-1.0wt% of Ce or La, less than 0.2wt% of impurities and the balance of Mg. The Zn element is added to improve the discharge activity and continuity of the magnesium alloy; the Cu element improves a solidus temperature of the material, improves the solid solubility of the Zn, accelerates combination of solute atoms and vacancy defects, eliminates the matrix defect, improves the uniformity of the alloy material and generates an MgZnCu ternary phase; under thermal treatment, ternary phase spheroidizing dispersion distribution is formed on a grain boundary; a product is corroded to smoothly fall off in the discharge process; a magnesium hydroxide passivation layer is destroyed; and further discharge is facilitated. The rare-earth Ce or La element is added to form a few of Mg-Ce or La phases in dot diffuse distribution; balancing of over-high corrosion rate of the magnesium alloy is facilitated; and the discharge efficiency of the negative electrode is improved.

Description

technical field [0001] The invention relates to a novel magnesium alloy suitable for the negative pole of a magnesium battery, more precisely, to a magnesium alloy used for the negative pole of the battery. Background technique [0002] With the increasing shortage of energy in all countries in the world, the increasing demand for energy, and the enhancement of people's awareness of environmental protection, the issue of seeking a new energy source is in front of us. This new energy must be a new battery product with no pollution, light weight, high energy, low price and strong adaptability. [0003] Generally speaking, the negative electrode of the battery is a metal alloy or an ionic compound of a metal. At present, the following metal alloys are widely used in the negative electrode of the battery: zinc, lead, cadmium, lithium, iron and other alloys. However, due to the needs of battery performance, heavy metals such as cadmium, lead, and mercury must be doped in the ma...

AI Technical Summary

Problems solved by technology

[0004] In view of the above problems, the present invention provides a magnesium alloy for battery negative electrode, by adding a certain proportion of Zn, Cu, Ce or La, to achieve the purpose of improving the discharge activity of the alloy and ensuring the corrosion resistance of the negative electrode material, thereby solving the current problem The discharge activity and corrosion resistance of some magnesium alloy anode materials cannot be balanced