SECONDARY BATTERY, BATTERY MODULE, BATTERY PACK, AND POWER-CONSUMING APPARATUS

The present application provides a secondary battery, which reduces costs of battery materials, effectively reduces a self-discharge rate of a battery cell, and improves storage impedance performance of the cell. The secondary battery includes a positive electrode sheet, a negative electrode sheet, and an electrolytic solution, where the positive electrode sheet includes a positive active material; in the positive active material, a contained rate of an element Co satisfies: Co≤0.09, and a content of an element Al satisfies: 500ppm≤Al≤10000ppm; and the electrolytic solution includes a compound represented by the following general formula (I).