A kind of rare earth magnesium alloy anode material and preparation method thereof

Abstract

The invention discloses a rare earth magnesium alloy anode material and a preparation method thereof. The rare earth magnesium alloy anode material is Mg, Al, Mn and Y alloys. According to the magnesium alloy anode material, through the synergistic effect of elements like Al, Mn and Y, discharge products on the surface are easy to dissolve, anode efficiency is high, and the corrosion rate is relatively low; the average potential at 20 mA / cm<2> current density constant-current discharge is minus 1.733 V, discharge is stable, and polarization is relatively small; the average potential at 100 mA / cm<2> current density constant-current discharge is minus 1.664 V, and besides, discharge efficiency reaches 85.7% under the current density; and a reasonable thermal treatment technology is adopted,components and tissues of the prepared alloy are more uniform, crystal particles are finer, and performance is excellent.

Description

technical field [0001] The invention relates to a magnesium alloy anode material and a preparation method thereof, in particular to a rare earth magnesium alloy anode material and a preparation method thereof. Background technique [0002] Magnesium alloy has the advantages of high energy density, relatively negative standard electrode potential, and large energy specific capacity. It is an ideal raw material for seawater activated batteries, magnesium-air batteries, and dissolved oxygen batteries. Seawater-activated batteries generally consist of two parts: a metal anode and a cathode phase made of metal chlorides such as AgCl and CuCl. Currently commonly used magnesium alloy anode materials include Mg–Hg–Ga, Mg–Al–Pb, Mg–Al–Tl and commercial AZ series. The common advantages of these anode materials are stable discharge, low hydrogen evolution rate, and high use efficiency, so they are widely used. However, the discharge activity of AZ series magnesium alloys is very low,...

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Problems solved by technology

However, the discharge activity of AZ series magnesium alloys is very low, and the discharge potential is relatively positive, at 10mA / cm 2 The discharge potential is still only -1.0~-1.3V at a low current density, and at 100mA / cm 2 The discharge potential is corrected at the above current density, and the battery system with AZ series as the anode material is difficult to meet the power required for equipment operation

[0003] However, the use of magnesium alloy anode materials is severely limited by the high polarization phenomenon and low anode efficiency.

The reason for this phenomenon is, on the one hand, the hysteresis effect of the redox reaction; on the other hand, there are problems in the magnesium alloy anode itself: 1. The surface of the magnesium anode is easily covered by the discharge product hydroxide, etc., and this discharge product will reduce the reactive point. And it hinders the discharge process, so the potential of the anode material is corrected in actual use; 2. Due to the additional discharge reaction on the electrode surface of the magnesium alloy anode material, the anode material cannot be completely used to generate current, so the anode utilization rate is low

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