Magnesium/cuprous chloride seawater battery, positive electrode material and preparation method thereof

The invention discloses a magnesium/cuprous chloride seawater battery, a positive electrode material and a preparation method of the positive electrode material, and belongs to the technical field of seawater batteries. The preparation method comprises the following steps: mixing cuprous chloride powder and cuprous sulfide powder according to a ratio of (95-99): (1-5) to obtain electrode powder; placing the electrode powder in a melting device, sealing and heating to 450-520 DEG C, and keeping the temperature for 2-4 hours to obtain a molten mass; and pouring the molten mass to a pair of rollers of a roller press provided with a current collector, carrying out cooling crystallization on the molten mass through the pair of rollers, and embedding the current collector in the middle of a crystal to prepare the strip electrode. The cuprous chloride powder and the cuprous sulfide powder material are mixed, heated and melted, and then are continuously poured into the roller press with the prefabricated current coll