Bismuth/carbon supercapacitor battery and preparation method thereof

The invention discloses a bismuth/carbon supercapacitor battery and a preparation method thereof. The bismuth/carbon supercapacitor battery uses a bismuth electrode for providing Faraday capacitance, uses a carbon electrode for providing electric double-layer capacitance, and uses an alkaline solution as an electrolyte; the bismuth is metal bismuth powder with the particle size of 0.005-5 microns and has the specific surface area of 5-500m /g; a preparation method of the metal bismuth powder comprises the following steps: mixing an auxiliary agent and bismuth ions with a certain concentration in a proper molar ratio to obtain a mixed solution, then dropwise adding a reducing agent into the mixed solution, and reacting to prepare metal bismuth powder material. When the bismuth/carbon supercapacitor battery is prepared, the bismuth electrode is used as a capacitance limiting electrode, and the capacitance of the carbon electrode is 0-30% higher than that of the bismuth electrode. The bismuth/carbon supercapacitor battery has the working voltage of 0-1V, and has the specific capacitance of 258mAh/g when the current density is 0.5A/g. The bismuth/carbon supercapacitor battery has good electrochemical performance, is environment-friendly, and is a novel chemical power supply with a wide application prospect.