Titanium nitride/sulfur composite material for positive electrode of lithium-sulfur battery and preparation method of titanium nitride/sulfur composite material
A lithium-sulfur battery and composite material technology, applied in battery electrodes, lithium batteries, non-aqueous electrolyte batteries, etc., can solve problems such as volume expansion and shuttle effect, and achieve the effects of inhibiting shuttle effect, high specific surface area, and strong adsorption capacity
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Embodiment 1
[0025] (1) Ultrasound the pure titanium (Ti) foil with a thickness of 0.1 mm in a mixture of acetone and ethanol for 2 h, then chemically polish it in concentrated nitric acid solution, rinse it with deionized water, and finally put the titanium foil in nitrogen Dry under protection.
[0026] (2) In an aqueous solution containing 2mg / mL ammonium fluoride and 8mg / mL ethylene glycol, oxidize titanium foil at a constant potential of 60V for 2h to obtain TiO 2 array of long nanotubes.
[0027] (3) The prepared TiO 2 The long nanotube arrays were calcined at 450°C for 2h in air to realize the phase transition from amorphous to anatase.
[0028] (4) The TiO after phase transition 2 The long nanotube array was heated to 800° C. for 3 h in ammonia gas, and then cooled to room temperature to obtain the TiN nanotube array. The heating rate is divided into the following stages: the heating rate from room temperature to 300 °C is 5 °C. min -1 , the heating rate from 300 to 700°C is ...
Embodiment 2
[0032] (1) Ultrasound the pure titanium (Ti) foil with a thickness of 0.1 mm in a mixture of acetone and ethanol for 2 h, then chemically polish it in concentrated nitric acid solution, rinse it with deionized water, and finally put the titanium foil in nitrogen Dry under protection.
[0033] (2) In an aqueous solution containing 2mg / mL ammonium fluoride and 8mg / mL ethylene glycol, oxidize titanium foil at a constant potential of 60V for 2h to obtain TiO 2 array of long nanotubes.
[0034] (3) The prepared TiO 2 The long nanotube arrays were calcined at 600°C for 2h in air to realize the phase transition from amorphous to anatase.
[0035] (4) The TiO after phase transition 2 The long nanotube array was heated to 800° C. for 3 h in ammonia gas, and then cooled to room temperature to obtain the TiN nanotube array. The heating rate is divided into the following stages: the heating rate from room temperature to 300 °C is 5 °C. min -1 , the heating rate from 300 to 700°C is ...
Embodiment 3
[0038] (1) Ultrasound the pure titanium (Ti) foil with a thickness of 0.1 mm in a mixture of acetone and ethanol for 2 h, then chemically polish it in concentrated nitric acid solution, rinse it with deionized water, and finally put the titanium foil in nitrogen Dry under protection.
[0039] (2) In an aqueous solution containing 2mg / mL ammonium fluoride and 8mg / mL ethylene glycol, oxidize titanium foil at a constant potential of 60V for 2h to obtain TiO 2 array of long nanotubes.
[0040] (3) The prepared TiO 2 The long nanotube arrays were calcined at 450°C for 2h in air to realize the phase transition from amorphous to anatase.
[0041] (4) The TiO after phase transition 2 The long nanotube arrays were heated to 600° C. for 3 h in ammonia gas, and then cooled to room temperature to obtain TiN nanotube arrays. The heating rate is divided into the following stages: the heating rate from room temperature to 200 °C is 5 °C. min -1, the heating rate from 200 to 500°C is 2°...
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