Potassium-sulfur battery electrode material and its preparation method and application
A battery electrode and potassium-sulfur technology, applied in the field of electrochemical energy storage, can solve problems such as ambiguity in product cognition, unsatisfactory electrochemical performance, and restrictions on the development of high-performance potassium-sulfur batteries, so as to eliminate the shuttle effect and improve electrochemical performance. The effect of performance and preparation method is simple and easy to operate
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Embodiment 1
[0023] Example 1: Microporous carbon nanofibers are prepared by electrospinning technology, configure 10wt.% N,N-dimethylformamide solution of polyacrylonitrile, set the electrospinning parameter voltage to 15KV, the distance between the injector and the collector The distance was 15cm, the solution flow rate was 0.8mL / h, and the polyacrylonitrile precursor film was prepared after six hours. The polyacrylonitrile film was placed in a tube furnace, pretreated at 280°C for 3 hours in an air atmosphere, and then carbonized at 800°C for 2 hours in an inert atmosphere of nitrogen. Subsequently, the high-temperature carbonized film was treated at 250°C for 2 hours in an air atmosphere to obtain microporous carbon nanofibers; the preparation method of the sulfur composite electrode material was to mix pure sulfur molecules with the prepared microporous carbon nanofibers at a mass ratio of 1 : 1 Vacuum sealed in a glass tube, placed in a muffle furnace, kept at 400°C for 5h, and set t...
Embodiment 2
[0024] Embodiment 2: the difference between embodiment 2 and embodiment 1 is that, after 800 DEG C of high-temperature calcining, carbon nanofibers are processed in air atmosphere at 350 DEG C for 2h, obtain multi-microporous carbon nanofibers; the preparation method of sulfur composite electrode material is to The pure sulfur molecules and the prepared microporous carbon nanofibers were vacuum-sealed in a glass tube with a mass ratio of 3:1, placed in a muffle furnace, kept at 500 °C for 5 h, and set to slowly cool down for 24 h. Among them, sulfur exists in the state of small molecule sulfur. The composite electrode can be directly used as the positive electrode material of the potassium-sulfur battery.
Embodiment 3
[0025] Embodiment 3: the difference between embodiment 3 and embodiment 1 is that, after 800 DEG C of high-temperature calcining, carbon nanofibers are treated in air atmosphere at 400 DEG C for 2h, and obtain multi-microporous carbon nanofibers; the preparation method of sulfur composite electrode material is to The pure sulfur molecules and the prepared microporous carbon nanofibers were vacuum-sealed in a glass tube with a mass ratio of 5:1, placed in a muffle furnace, kept at 600°C for 5 hours, and set to slowly cool down for 18 hours. Among them, sulfur exists in the state of small molecule sulfur. The composite electrode can be directly used as the positive electrode material of the potassium-sulfur battery.
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