Two-dimensional transition metal boride material as well as preparation method and application thereof

The invention discloses a two-dimensional transition metal boride material and a preparation method and application thereof.The preparation method comprises the steps that Mo, Y, Al and B elementary substance powder are mixed and sintered, and a precursor material i-MAB phase is prepared; the preparation method comprises the following steps: adding a precursor material i-MAB phase into a mixed solution of lithium fluoride and a hydrochloric acid solution to carry out hydrothermal reaction, cleaning an obtained hydrothermal reaction product to obtain multi-layer Boridene, mixing the multi-layer Boridene with a tetramethylammonium hydroxide solution to carry out intercalation reaction, cleaning a product obtained by the intercalation reaction, taking a precipitate to carry out low-temperature ultrasonic treatment to obtain a few-layer Boridene suspension, and drying the few-layer Boridene suspension to obtain the lithium ion battery cathode material. And carrying out centrifugal treatment to obtain a few-layer