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Magnesium-air battery negative electrode surface modification method and electrolyte

A technology of surface modification and air battery, which is applied to the electrodes of primary batteries, battery electrodes, and aqueous electrolytes, and can solve problems such as failure to improve the hysteresis behavior of the discharge voltage of the magnesium negative electrode, many steps in the chemical conversion film, and aggravate the hysteresis behavior. Achieve the effects of shortening the battery preparation cycle, simple components, and increasing the working voltage

Active Publication Date: 2020-05-15
SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current method has greatly improved the corrosion resistance of the magnesium negative electrode, reduced the self-discharge of the battery, and extended the service life of the battery, but did not take into account the improvement of the voltage hysteresis behavior of the magnesium negative electrode during discharge, and even aggravated the hysteresis behavior.
In addition, there are relatively many steps in the preparation of chemical conversion coatings, and the process is time-consuming

Method used

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  • Magnesium-air battery negative electrode surface modification method and electrolyte
  • Magnesium-air battery negative electrode surface modification method and electrolyte
  • Magnesium-air battery negative electrode surface modification method and electrolyte

Examples

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Embodiment 1

[0024] The electrolyte solution used in this embodiment is composed of electrolyte solution A (2mol L -1 Magnesium nitrate+0.2mol·L -1 Magnesium sulfate+0.02mol·L -1 Ammonium dihydrogen phosphate) and electrolyte composition B (2mol L -1 Magnesium nitrate+0.2mol·L -1 Magnesium sulfate+0.02mol·L -1 ammonium molybdate) mixed in a volume ratio of 3:7. The negative electrode material is AZ31B magnesium alloy, the surface adopts a cycle potential range of -0.5~2.0V, the number of scans is 5 times, and the scan speed is 0.03V s -1 The cyclic voltammetry parameter is used to plate polyaniline film, and the electroplating solution is 0.2mol L-1 Aniline+0.5mol·L -1 sodium salicylate. After coating, soak in the electrolyte for 1 day, and then test the surface morphology, impedance value, and discharge performance of the magnesium negative electrode.

Embodiment 2

[0028] The electrolyte solution used in this embodiment is composed of electrolyte solution A (2mol L -1 Magnesium nitrate+0.2mol·L -1 Magnesium sulfate+0.02mol·L -1 Ammonium dihydrogen phosphate) and electrolyte composition B (2mol L -1 Magnesium nitrate+0.2mol·L -1 Magnesium sulfate+0.04mol·L -1 ammonium molybdate) mixed in a volume ratio of 1:9. The negative electrode material is AZ31B magnesium alloy, the surface adopts a cycle potential range of -1.0~2.0V, the number of scans is 10 times, and the scan speed is 0.03V s -1 The cyclic voltammetry parameter is used to plate polyaniline film, and the electroplating solution is 0.2mol L -1 Aniline+0.5mol·L -1 sodium salicylate. After coating, soak in the electrolyte for 1 day, and then test the surface morphology, impedance value, and discharge performance of the magnesium negative electrode.

Embodiment 3

[0030] The electrolyte solution used in this embodiment is composed of electrolyte solution A (2mol L -1 Magnesium nitrate+0.2mol·L -1 Magnesium sulfate+0.02mol·L -1 Ammonium dihydrogen phosphate) and electrolyte composition B (2mol L -1 Magnesium nitrate+0.2mol·L -1 Magnesium sulfate+0.02mol·L -1 ammonium molybdate) mixed in a volume ratio of 3:7. The negative electrode material is AZ31B magnesium alloy, the surface adopts a cycle potential range of -1 ~ 3V, the number of scans is 10 times, and the scan speed is 0.03V s -1 The cyclic voltammetry parameter is used to plate polyaniline film, and the electroplating solution is 0.2mol L -1 Aniline+0.5mol·L -1 sodium salicylate. After coating, soak in the electrolyte for 1 day, and then test the surface morphology, impedance value, and discharge performance of the magnesium negative electrode.

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Abstract

The invention provides a magnesium-air battery negative electrode surface modification method. The method is characterized in that a polyaniline film is plated on the surface of a magnesium negative electrode through a one-step electrochemical synthesis method to carry out the negative electrode surface modification, and then electrolysis is carried out in a specific electrolyte, so that the effects of simultaneously improving the working voltage of a magnesium-air battery, prolonging the service life of the battery and greatly reducing the voltage hysteresis effect of the battery are achieved. By adopting the negative electrode modification method and the electrolyte system, the corrosion resistance of the magnesium negative electrode can be improved, and the surface film of the magnesiumnegative electrode is more compact. Compared with an AZ31B magnesium alloy without a coating film, the impedance value of the magnesium alloy coated with the polyaniline film on the surface is obviously improved. The method is simple in step, the film forming process is completed in one step, and the battery preparation period is shortened. Meanwhile, the electrolyte is simple in component and low in cost and meets the safe and environment-friendly requirements.

Description

technical field [0001] The invention belongs to the technical field of magnesium-air batteries, and in particular relates to a method for modifying the surface of a negative electrode of a magnesium-air battery and an electrolyte. Background technique [0002] As the concepts of energy saving, environmental protection and green travel are widely recognized by the international community, electric vehicles have gradually become a hot spot in the development of transportation tools and a focus of research and development in the automotive industry. The working principle of electric vehicles is: battery - current - power regulator - electric motor - power transmission system - driving the car (Road). The development of batteries is an important part of the research and development of the electric vehicle industry. At present, a lot of research work is devoted to improving the energy density of lithium-ion batteries, but the energy density of lithium-ion batteries is about 100-2...

Claims

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Application Information

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IPC IPC(8): H01M4/12H01M4/36H01M4/46H01M4/62H01M12/06
CPCH01M4/12H01M4/366H01M4/466H01M4/628H01M12/06H01M2300/0002
Inventor 杨巧玲陈琳朱雯莉杜娟龚军怡胡朝明
Owner SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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