Air electrode of lithium-air battery and preparation method thereof
A lithium-air battery and air electrode technology, which is applied to battery electrodes, circuits, electrical components, etc., can solve the problems of restricting development and increasing the cost of lithium-air batteries, and achieve the effects of reduced dosage, good catalytic activity, and convenient use
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Embodiment l
[0014] The Ta sheet was cleaned with ethanol, and the mass fraction was 0.5% NH 4 In the ethylene glycol solution of F, the anode electrochemical corrosion was carried out, in which Ta was used as the anode and the Pt sheet was used as the negative electrode. The anode corrosion potential is 60V, and the corrosion time is 8h. Get TaO 2 Nanotubes at 850°C, NH 3 High-temperature reduction in the atmosphere for 1 h to obtain TaN nanotubes.
[0015] Pt nanoparticles were deposited into TaN nanotubes by electrochemical deposition with an electrolyte of 0.25 mM H 2 PtC1 6 Dissolved in 0.1M HCl and electrodeposited by cyclic voltammetry. The potential range is -0.6~0.1V, and the scanning speed is 20mVs -1 , 10 cycles of deposition, that is, a Pt / TaN air electrode is obtained. The air electrode is a lcm×lcm square pole piece with a thickness of 100um, the thickness of the TaN nanotube array loaded with Pt nanoparticles is 22um, the inner diameter of the casing structure is 50-6...
Embodiment 2
[0017] The Ta sheet was cleaned with ethanol, and the mass fraction was 0.5% NH 4 In the ethylene glycol solution of F, the anode electrochemical corrosion was carried out, in which Ta was used as the anode and the Pt sheet was used as the negative electrode. The anode corrosion potential is 60V, and the corrosion time is 8h. Get TaO 2 Nanotube arrays at 1100 °C, NH 3 High-temperature reduction in the atmosphere for 1 h to obtain TaN nanotubes.
[0018] Gold nanoparticles were deposited into TaN nanotubes by electrochemical deposition with an electrolyte of 0.25 mM H 2 AuC1 6 Dissolved in 0.1M HCl and electrodeposited by cyclic voltammetry. The potential range is -0.6~0.1V, and the scanning speed is 20mVs -1 , 10 cycles of deposition, that is, the coaxial casing structure of Au / TaN is obtained. The composite electrode is a lcm×lcm square pole piece with a thickness of 100um. The thickness of the TaN nanotube array loaded with gold nanoparticles is 23um, the inner diamet...
Embodiment 3
[0020] The Ta sheet was cleaned with ethanol, and the mass fraction was 0.5% NH 4 In the ethylene glycol solution of F, the anode electrochemical corrosion was carried out, in which Ta was used as the anode and the Pt sheet was used as the negative electrode. The anode corrosion potential is 60V, and the corrosion time is 8h. TaO will be obtained 2 The nanotube array was placed in 1mM ammonium molybdate solution for 1h, and then the pole piece was carefully rinsed with water, and dried at 280°C for 3h, and the MoO-loaded 3 TaO 2 Nanotube arrays were placed in a tube furnace in NH 3 1000°C high temperature reduction in the atmosphere, the heating rate during the heating process is 5°C min -1 . The MoN / TaN air electrode can be obtained. The lithium-air battery based on this air electrode has a specific capacity of 1970mAh g -1 . The open circuit potential can reach 3.7V. The potential difference between the charging and discharging platforms is 0.5V.
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