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Magnesium alloy anode material for seawater battery and preparation method of magnesium alloy anode material

A technology for anode materials and seawater batteries, applied in battery electrodes, immersion batteries, circuits, etc., can solve problems such as fast corrosion speed and difficult processing of anode materials, and achieve easy dissolution, reduced galvanic corrosion tendency, and grain refinement Effect

Active Publication Date: 2020-11-20
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the above-mentioned problems that magnesium alloys are used as anode materials for seawater batteries, the processing is difficult and the corrosion rate is fast, especially the magnesium alloys with the addition of Ca elements cannot overcome the problem of accelerated corrosion due to the increase in the number of cracks in magnesium alloys. The present invention proposes a A kind of magnesium alloy anode material for seawater battery and preparation method thereof

Method used

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  • Magnesium alloy anode material for seawater battery and preparation method of magnesium alloy anode material
  • Magnesium alloy anode material for seawater battery and preparation method of magnesium alloy anode material
  • Magnesium alloy anode material for seawater battery and preparation method of magnesium alloy anode material

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Effect test

Embodiment 1

[0028] 1) Take AZ31 (Mg-3.48wt.%Al-0.99wt.%Zn-0.46wt.%Mn), pure magnesium (99.95wt%), Mg-20wt.%Ca raw materials, and weigh the raw materials. in CO 2 (99vol%) and SF 6 (1vol%) under the protective atmosphere of mixed gas, the melting temperature is 700 ~ 720 ° C, the raw materials are completely melted and stirred, and then poured into a steel mold after standing for 10 minutes to obtain a block magnesium alloy anode material ingot, which is recorded as AZ31 -1.0Ca;

[0029] 2) Use a wire electric discharge machine to cut a cuboid ECAP sample with a size of 45×20×20mm and heat the ECAP mold to 300-310°C, then put the magnesium alloy sample evenly coated with graphite milk into the mold and keep it warm for 10 minutes , followed by 8 passes of ECAP processing; the ECAP mold cavity used is in the shape of a "ten", and reciprocating processing can be achieved by rotating 90° during processing to obtain a uniform and refined structure. The processed anode material is denoted as...

Embodiment 2

[0031] 1) Take AZ31 (Mg-3.48wt.%Al-0.99wt.%Zn-0.46wt.%Mn), pure magnesium (99.95wt%), Mg-20wt.%Ca as raw materials, and weigh the raw materials. in CO 2 (99vol%) and SF 6 (1vol%) under the protection atmosphere of the mixed gas, melting temperature 700~720 ℃, after raw material is melted completely, stir, after standing for 10 minutes, pour into the steel mold and obtain block magnesium alloy anode material ingot;

[0032] 2) Use a wire electric discharge machine to cut a cuboid ECAP sample with a size of 45×20×20mm and heat the ECAP mold to 300-310°C, then put the magnesium alloy sample evenly coated with graphite milk into the mold and keep it warm for 10 minutes , followed by 12 passes of ECAP processing, and the resulting anode material is denoted as AZ31-1.0Ca 12p.

[0033] performance analysis

[0034] like figure 1 As shown, after alloying with 1.0wt.% Ca, a network (Mg, Al) precipitated along the grain boundary is formed in the AZ31-1.0Ca alloy 2 Ca phase. After ...

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Abstract

The invention discloses a magnesium alloy anode material for a seawater battery and a preparation method of the magnesium alloy anode material. The preparation method comprises the following steps of:S1, under a protective atmosphere, melting a magnesium alloy raw material containing a Ca element at a temperature higher than 700 DEG C, and then performing casting and water-cooling to obtain as-cast magnesium alloy; S2, treating the as-cast magnesium alloy material through an equal-channel angular pressing process, conducting water cooling after completing treatment so as to obtain variable-form fine-grain magnesium alloy; and S3, cutting off the surface layer of the deformed fine-grain magnesium alloy to obtain the magnesium alloy anode material for the seawater battery. With the method adopted, the environment-friendly and economic requirements of magnesium alloy manufacturing can be met; in the later period, the (Mg, Al) 2Ca phase in the alloy can be crushed and dispersed through anECAP process, so that the galvanic corrosion tendency between the precipitated phase and the magnesium matrix can be effectively reduced, meanwhile, crystal grains are refined, and the discharge efficiency can be improved.

Description

technical field [0001] The invention belongs to the field of anode materials for seawater batteries, and in particular relates to a magnesium alloy anode material for seawater batteries and a preparation method thereof. Background technique [0002] Magnesium alloys have attracted much attention as anode materials for seawater batteries due to their good discharge performance. Magnesium has a relatively negative electrode potential of -2.37V, which is lower than that of aluminum and zinc, and shows high discharge activity; the Faraday capacity of magnesium is high, 2.205A h / g, although lower than that of lithium (3.862A h / g / g) and aluminum (2.980A h / g), but much higher than zinc (0.820A h / g); meanwhile, the density of magnesium is 1.74g / cm 2 , lower than aluminum (2.70g / cm 2 ) and zinc (7.14g / cm 2 ), which is conducive to the weight reduction of the battery system, so as to achieve high energy density transmission; in addition, magnesium is rich in resources, low in pric...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/46H01M6/34C22C1/03C22C23/00C22F1/06
CPCH01M4/466H01M6/34C22C1/03C22C23/00C22F1/06
Inventor 马爱斌谢秋媛江静华刘欢宋丹
Owner HOHAI UNIV
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