Preparation method of vacancy ternary metal MAX phase and application thereof
A ternary metal and vacancy technology, applied in the direction of non-metal elements, chemical instruments and methods, electrical components, etc., can solve the problems of tight arrangement and stacking, positive electrode materials, and inability to be used as an effective zinc ion battery, and achieve good cycle performance and vacancy Effect of high quantity and good cycle stability
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Embodiment 1
[0029] The preparation method of the vacancy ternary metal MAX phase in this embodiment, the steps are as follows:
[0030] (1) Ternary metal MAX phase (V 2 TiAlC 2 ), acetylene black and polyvinylidene fluoride in a mass ratio of 8:1:1, using nitrogen methyl pyrrolidone as a dispersant, evenly coated on titanium foil, dried in vacuum at 80 °C for 12 hours, and then used a press at 5 M Pa for 2 minutes to obtain a compacted ternary metal MAX phase electrode sheet with an areal loading of 1 mg cm -2 ;
[0031] (2) With the ternary metal MAX phase electrode sheet as the positive electrode, the zinc sheet as the negative electrode, and the 3M zinc trifluoromethanesulfonate aqueous solution as the electrolyte, a button-type zinc-ion battery is formed. At a current density of 10mA / g, the constant current for the first time The charging time is 50 hours, and the ternary metal MAX phase with vanadium vacancies can be obtained after the first in-situ charging activation;
[0032] ...
Embodiment 2
[0035] The preparation method of the vacancy ternary metal MAX phase in this embodiment, the steps are as follows:
[0036] (1) V 2 TiAlC 2 , acetylene black and polyvinylidene fluoride in a mass ratio of 8:1:1, using nitrogen methyl pyrrolidone as a dispersant, evenly coated on the titanium mesh, dried in vacuum at 120 ° C for 12 hours, and then pressed at 10 MPa with a press Under 1 minute, a compacted ternary metal MAX phase electrode sheet was obtained with an areal loading of 15 mg cm -2 ;
[0037] (2) The ternary metal MAX phase electrode sheet is used as the positive electrode, the zinc sheet is used as the negative electrode, and the 3M zinc trifluoromethanesulfonate aqueous solution is used as the electrolyte to form an open electrolytic cell type zinc ion battery. At a current density of 50mA / g, The first constant current charging time is 100 hours, and the ternary metal MAX phase with vanadium vacancies can be obtained after the first in-situ charging activation;...
Embodiment 3
[0040] The preparation method of the vacancy ternary metal MAX phase in this embodiment, the steps are as follows:
[0041] (1) V 2 TiAlC 2 , acetylene black and polyvinylidene fluoride in a mass ratio of 8:1:1, using nitrogen methyl pyrrolidone as a dispersant, evenly coated on the titanium foil, dried in vacuum at 80 ° C for 12 hours, and then used a press at 5 MPa Press down for 2 minutes to obtain a compacted ternary metal MAX phase electrode sheet with an areal loading of 3 mg cm -2 ;
[0042] (2) Use the ternary metal MAX phase electrode sheet as the positive electrode, the zinc sheet as the negative electrode, and 2M zinc sulfate aqueous solution as the electrolyte to form a button-type zinc-ion battery. Under the current density of 500mA / g, the first constant current charging time is 10 Hours, the ternary metal MAX phase with vanadium vacancies can be obtained after the first in-situ charge activation;
[0043] The vacancy ternary metal MAX phase is directly used a...
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