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Sea cell Mg-Li-Zn alloy electrode modified by yttrium-rich mischmetal element and preparing method

An alloy electrode, mixed rare earth technology, applied in battery electrodes, electrodes of primary batteries, immersed batteries, etc., can solve the problems of short service life and low discharge current density, reduce production costs, improve corrosion resistance and use. life, the effect of increasing the discharge current density

Inactive Publication Date: 2016-10-12
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to simultaneously improve the discharge current and discharge efficiency of Mg-Li-based alloy electrodes, a technical approach; further improve the discharge performance of Mg-Li-based alloys, and solve the problems of low discharge current density and short service life of Mg-Li-based alloy electrodes in seawater batteries , the present invention adds yttrium-rich mixed rare earth (RE) and metal zinc (Zn) elements to the Mg-Li-based alloy as alloy elements at the same time, and proposes a multi-component Mg-Li-Zn-RE alloy, which becomes a high-quality seawater battery. performance anode material

Method used

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  • Sea cell Mg-Li-Zn alloy electrode modified by yttrium-rich mischmetal element and preparing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1 Multi-element Mg-15Li-2.5Zn-2.5RE alloy electrode

[0027] The composition (mass fraction) of the alloy is: Mg: 80%, Li: 15%, Zn: 2.5%, RE: 2.5%.

[0028] The preparation steps of the alloy electrode: In the vacuum melting furnace, first preheat the crucible to dark red, add the dried pure magnesium ingot, and start to feed SF 6 +Ar mixed gas; in SF 6 Under the protection of +Ar gas, continue to heat up to 700°C, and add pure zinc ingots; when the temperature rises to 780°C, add magnesium-yttrium-rich mixed rare earth (Mg-RE) master alloy, and stir evenly after all the raw materials are melted; after the alloy is smelted , remove the powdered magnesium oxide and covering agent mixture on the surface, let it stand at 780°C for more than 30min, and then pour; after pouring, the obtained alloy sample is kept at 300°C for 10h in a vacuum heat treatment furnace; the multi-component Mg-15Li- 2.5Zn-2.5RE alloy electrodes.

[0029] The discharge performance of the ...

Embodiment 2

[0030] Example 2 Multi-element Mg-11.9Li-1.5Zn-1.6RE alloy electrode

[0031] The composition (mass fraction) of the alloy is: Mg: 85%, Li: 11.9%, Zn: 1.5%, RE: 1.6%.

[0032] The preparation steps of the alloy electrode: In the vacuum melting furnace, first preheat the crucible to dark red, add the dried pure magnesium ingot, and start to feed SF 6 +Ar mixed gas; in SF 6 Under the protection of +Ar gas, continue to heat up to 710°C, and add pure zinc ingots; when the temperature rises to 790°C, add magnesium-yttrium-rich mixed rare earth (Mg-RE) master alloy, and stir evenly after all the raw materials are melted; after the alloy is smelted , remove the powdered magnesium oxide and covering agent mixture on the surface, let it stand at 790°C for more than 30min, and then pour; after pouring, the obtained alloy sample is kept at 300°C for 10h in a vacuum heat treatment furnace; the multivariate 80Mg-15Li- 2.5Zn-2.5RE alloy electrode.

[0033] The electrochemical performance...

Embodiment 3

[0034] Example 3 Multivariate 90Mg-5Li-0.2Zn-3RE Alloy Electrode

[0035] The composition (mass fraction) of the alloy is: Mg: 90%, Li: 9.3%, Zn: 0.5%, RE: 0.2%.

[0036] The preparation steps of the alloy electrode: In the vacuum melting furnace, first preheat the crucible to dark red, add the dried pure magnesium ingot, and start to feed SF 6 +Ar mixed gas; in SF 6 Under the protection of +Ar gas, continue to heat up to 715°C, and add pure zinc ingots; when the temperature rises to 800°C, add magnesium-yttrium-rich mixed rare earth (Mg-RE) master alloy, and stir evenly after all the raw materials are melted; after the alloy is smelted , remove the powdered magnesium oxide and covering agent mixture on the surface, let it stand at 800°C for more than 30min, and then pour; after pouring, the obtained alloy sample is kept at 300°C for 10h in a vacuum heat treatment furnace; the multi-component 90Mg-9.3Li -0.5Zn-0.2RE alloy electrode.

[0037] The electrochemical performance ...

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Abstract

The invention relates to a seawater battery Mg-Li-Zn alloy electrode modified by using yttrium-rich mixed rare earth elements and a preparation method thereof. The alloy electrode composition is Mg: 80‑90%; Li: 5‑15%; Zn: 0.5‑2.5%; RE: 0.2‑3%. The multi-component Mg-Li-Zn-RE alloy electrode was prepared by adding cerium-rich mixed rare earth elements and metal zinc to the Mg-Li-based alloy simultaneously by vacuum melting technology, which improved the discharge current density and the discharge current density of the Mg-Li-based alloy electrode. Corrosion resistance. The corrosion potential in 3.5% sodium chloride aqueous solution is greater than ‑1.45V (vs. SCE), and the discharge current density is greater than 40mA / cm at ‑1.0V voltage (vs. SCE) 2 , the discharge performance is significantly higher than the traditional Mg-Li-based alloy electrodes, improving corrosion resistance and service life. Become a high-performance anode material for seawater batteries.

Description

technical field [0001] The invention belongs to the technical field of seawater batteries, and in particular relates to a seawater battery Mg-Li-Zn alloy electrode modified by using yttrium-rich mixed rare earth elements and a preparation method. Background technique [0002] With the rapid development of coastal defense construction, marine resource development and marine ecological research, the demand for high-performance chemical power supplies working in marine environments is increasing day by day. Metal magnesium has a negative electrode potential and a large theoretical specific capacity (2205Ah kg -1 ), high specific energy (6.8kWh·kg -1 ), low price, environmental friendliness, etc., and has excellent discharge performance, and has become an important electrochemical anode material. Various types of magnesium batteries using magnesium and magnesium alloys as anodes (such as magnesium-seawater activated batteries, magnesium-hydrogen peroxide semi-fuel cells and ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/06H01M4/12H01M4/36H01M4/46H01M6/34
CPCH01M4/06H01M4/12H01M4/364H01M4/466H01M6/34
Inventor 徐强
Owner TIANJIN UNIV
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