Lithium bismuthate/nickel hydroxide secondary alkaline battery and preparation method thereof

The invention relates to a lithium bismuthate/nickel hydroxide secondary alkaline battery and a preparation method thereof. The preparation method utilizes a lithium bismuthate material as a negative electrode active material of the battery, a nickel hydroxide material as a positive electrode active material of the battery and an alkaline solution as an electrolyte solution. The battery has a voltage window of 0.2 to 1.4V. A preparation method of the lithium bismuthate material comprises preparing a mixed solution from a lithium raw material and NaBiO3 according to a certain molar ratio, and carrying out a reflux reaction process at 90 to 110 DEG C for 2 to 72 hours, or carrying out hydrothermal treatment on the mixed solution in a reactor at 120 to 200 DEG C for 2 to 96 hours. The prepared battery has a capacitance of 166 mAh/g at current density of 0.5 A/g and a capacitance of 143 mAh/g at current density of 5 A/g, has characteristics of large capacitance, good cycle stability and environmental friendliness, and is a novel electrochemical power source with a wide application prospect.