Preparation method of cathode material for lithium-sulfur battery
A positive electrode material, lithium-sulfur battery technology, applied in the direction of battery electrodes, electrolyte battery manufacturing, nanotechnology for materials and surface science, etc., can solve the problem of low capacity of lithium ion batteries, reduce the shuttle effect, prevent migration, The effect of improving electrical conductivity
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[0017] The specific steps of the preparation method of a lithium-sulfur battery cathode material of the present invention are as follows.
[0018] in TiO 2 The pores of nanotubes are uniformly filled with nano-sulfur particles to form S@TiO 2 Nanotube composite electrode material, wherein the mass content of sulfur is adjustable in the range of 10-90wt%, TiO 2 The mass content of the nanotube is adjustable in the range of 10-90wt%. Sulfur nanoparticles have a particle size distribution of 1-200 nm; TiO 2 Nanotubes are prepared by anodic oxidation. TiO 2 The nanotube is a hollow structure with two ends open, the outer diameter is 50-300 nanometers, the wall thickness is 10-40 nanometers, and the length is 0.2-1000 microns.
Embodiment 1
[0020] 0.5wt% NH 4 F Electrolyte salt and 3wt% deionized water are added into the ethylene glycol solution to form an electrolyte. A two-electrode system was used, with Ti sheet as the anode and Pt as the cathode, placed in the electrolyte, anodized at 60V for 3h, and immediately placed in deionized water for ultrasonic cleaning for 15min. After cleaning, heat-treat the anodized Ti sheet at 250°C for 1 h, and then perform a second anodic oxidation for 30 min under the original preparation conditions, at which time the oxide film falls off. The oxide film was placed in a reducing atmosphere (Ar:H 2 =95:5) after calcination in the furnace for 1h and then cooled in the furnace. Sublimed sulfur is then dissolved into carbon disulfide, and TiO 2 The nanotubes were fully mixed and dried, and placed in an inert atmosphere of Ar for heat treatment at 160 ° C for 6 h. Get S@TiO after cooling 2 Nanotube composite electrode materials. The battery is then assembled and tested.
Embodiment 2
[0022] 0.38wt% NH 4 F Electrolytic salt and 2.10wt% deionized water are added into the ethylene glycol solution to form an electrolyte. A three-electrode system is adopted, with Ti sheet as the anode, Pt as the cathode, and a saturated calomel electrode as the reference electrode, placed in the electrolyte, anodized at 40V for 10min, and immediately increased to 150V to obtain exfoliated TiO 2 nanotube membrane. The oxide film was calcined in a hydrogen atmosphere at 450°C for 2 hours and then cooled in the furnace. Sublimed sulfur is then dissolved in carbon tetrachloride, and TiO 2 The nanotubes were fully mixed and dried, and placed in an inert atmosphere of Ar for heat treatment at 300 ° C for 10 h. Obtained after cooling, S@TiO 2 Nanotube composite electrode materials. The battery is then assembled and tested.
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