| abstract |
An aqueous zinc ion battery positive electrode material and a matching electrolyte. The chemical formula of the positive electrode material is R x K y Mn 1‑x O 2‑z , wherein 0≤x≤0.1, 0≤y≤0.5, 0＜z＜0.1, R is a metal cation, and the preparation process includes: potassium permanganate , manganese acetate tetrahydrate and metal salt are ground and mixed evenly and then placed in a tube furnace for heat treatment under a protective atmosphere, the obtained product is washed with deionized water, suction filtered several times, and then dried in an oven to obtain R x K y Mn. 1‑x O 2‑z cathode material. In the present invention, K + is successfully pre-embedded into the tunnel structure of the manganese dioxide crystal through one-step heat treatment, metal cations are doped into the manganese dioxide crystal, and oxygen vacancies are introduced into the surface of the manganese dioxide crystal, thereby improving the structural stability of the manganese dioxide. , increased active sites and improved electrical conductivity. The invention has low production cost, simple process, mild reaction conditions and easy large-scale preparation. The cathode material has high specific capacity, high rate performance and excellent cycle stability; matching compatible aqueous electrolyte further improves the long cycle life of the cathode material. |