Primary lithium battery

A primary lithium battery, comprising:

• a reactive solid cathode,
• a liquid electrolyte,
• a separator, and
• a lithium anode, wherein:
• the liquid electrolyte comprises a solvent and an electrolyte salt,
• a concentration of the electrolyte salt in the liquid electrolyte is 0.1-3 mol/L,
• the solvent comprises a sulfite ester type compound and an organic solvent,
• a concentration of the sulfite ester type compound in the organic solvent is 5 wt % to 90 wt %,
• a structural formula of the sulfite ester type compound is as follows:
• R is selected from hydrogen, fluorine, chlorine, bromine, iodine, an alkyl group comprising a general formula of —CxH2x+1, or an olefin group comprising a general formula of —CH═CxH2x, wherein x is an integer selected from 1 to 5,
• R′ is selected from hydrogen, fluorine, chlorine, bromine, iodine, an alkyl group comprising a general formula of —CxH2x+1, or an olefin group comprising a general formula of —CH═CxH2x, wherein x is an integer selected from 1 to 5, and
• when a voltage of the primary lithium battery is in a range of 3.2V-2.4V, an active material of the reactive solid cathode will first participate in a discharge reaction, and when the voltage of the primary lithium battery drops below 2.4V, the sulfite ester type compound in the liquid electrolyte will participate in the discharge reaction by acting as a liquid electrode.