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Electrochemical preparation method of selenium-carbon microspheres and aluminum-selenium battery

An electrochemical and microsphere technology, applied in the field of electrochemistry, can solve the problems of uneven mixing, selenium dissolution, cumbersome process, etc., and achieve the effect of low price and good uniformity

Active Publication Date: 2022-07-01
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above chemical methods involve toxic gases, or expensive organic substances, and the procedures are cumbersome
In addition, the synthesized composite material has uneven mixing, and a large amount of selenium is exposed outside, which is easy to cause the dissolution of selenium during the cycle, and the resulting large capacity fading problem

Method used

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  • Electrochemical preparation method of selenium-carbon microspheres and aluminum-selenium battery
  • Electrochemical preparation method of selenium-carbon microspheres and aluminum-selenium battery
  • Electrochemical preparation method of selenium-carbon microspheres and aluminum-selenium battery

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The selenium dioxide powder was compressed into a columnar block of φ10mm×5mm on a powder molding tablet machine. The selenium dioxide columnar block was used as the cathode, the graphite plate was used as the anode, and the mixed salt of aluminum chloride and sodium chloride with a molar ratio of 1:1 was used as the electrolyte. Under the protection of argon gas, the temperature was raised to 190°C, and electrolysis was carried out at a constant voltage of 0.8V for 120min. After cooling to room temperature, the cathode product was taken out, and after ultrasonic treatment for 10 min, it was repeatedly washed with dilute hydrochloric acid and deionized water for 5 times. The electrolysis product is a selenium-carbon complex, which is in the form of a block. The electron microscope photos are as follows. figure 1 shown. Among them, the mass of selenium accounts for 97.3%, and the proportion of carbon is 2.7%.

Embodiment 2

[0029] The selenium dioxide powder was compressed into a columnar block of φ10mm×5mm on a powder molding tablet machine. The selenium dioxide columnar block was used as the cathode, the graphite plate was used as the anode, and the mixed salt of aluminum chloride and sodium chloride with a molar ratio of 1:1 was used as the electrolyte. Under the protection of argon, the temperature was raised to 190 °C, and electrolysis was carried out at a constant voltage of 1.0 V for 120 min. After cooling to room temperature, the cathode product was taken out, and after ultrasonic treatment for 10 min, it was repeatedly washed with dilute hydrochloric acid and deionized water for 5 times. The electrolysis product is a selenium-carbon composite, part of which is in the form of microspheres. The electron microscope photos are as follows: figure 2 shown. Among them, the mass of selenium accounts for 95.5%, and the proportion of carbon is 4.5%.

Embodiment 3

[0031] The selenium dioxide powder was compressed into a columnar block of φ10mm×5mm on a powder molding tablet machine. The selenium dioxide columnar block was used as the cathode, the graphite plate was used as the anode, and the mixed salt of aluminum chloride and sodium chloride with a molar ratio of 1:1 was used as the electrolyte. Under the protection of argon gas, the temperature was raised to 190°C, and electrolysis was carried out at a constant voltage of 1.2V for 120min. After cooling to room temperature, the cathode product was taken out, and after ultrasonic treatment for 10 min, it was repeatedly washed with dilute hydrochloric acid and deionized water for 5 times. The electrolysis product is a selenium-carbon composite, which is completely in the form of microspheres with a diameter of about 100 μm. The electron microscope photos are as follows figure 1 shown. X-ray diffraction patterns such as Figure 4 shown, consistent with the hexagonal selenium lattice. ...

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Abstract

The invention provides an electrochemical preparation method of selenium-carbon microspheres, belonging to the field of electrochemistry. The preparation process is as follows: first, the oxygen-containing selenium-based compound is pressed into a block electrode as a cathode, a graphite plate is used as an anode, and constant voltage electrolysis is performed in an electrolyte of 25-210° C. with a cell voltage of 0.8-1.8V for 60-300 minutes, and then the electrolysis is carried out for 60-300 minutes. The product obtained by chemical reduction is subjected to post-processing, and the selenium-carbon microsphere composite can be recovered. The one-step electrochemical preparation method of selenium-carbon microspheres proposed by the invention has the advantages of wide adaptability of raw materials, low energy consumption, simple process, green and sustainable process and the like. Most importantly, the selenium-carbon microsphere electrode material prepared by this method has excellent cycle stability, high specific capacity and high-rate discharge capability, and is expected to become the positive electrode of new aluminum-selenium batteries.

Description

technical field [0001] The invention belongs to the field of electrochemistry, in particular to an electrochemical preparation method of selenium-carbon microspheres, and also to the application of the electrode material in aluminum-selenium batteries. Background technique [0002] In addition to being used in traditional fields, selenium also shows special advantages in the field of new energy storage. The theoretical specific capacity of selenium-based materials is higher than that of carbon materials, and the theoretical specific capacity of aluminum-selenium batteries composed of metal aluminum negative electrodes can be as high as 1357mAh g -1 . Competitive advantages in specific areas such as miniaturization and areas where energy density is in high demand. The inventor's research group used the hot melt infusion method to infuse selenium into the ordered mesoporous carbon material, and synthesized a composite material of ordered mesoporous carbon coated selenium (Ch...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58H01M4/62
CPCH01M4/58H01M4/625Y02E60/10
Inventor 涂继国常诚焦树强
Owner UNIV OF SCI & TECH BEIJING
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