LITHIUM SECONDARY BATTERY

A lithium secondary battery includes a positive electrode, a negative electrode, and a nonaqueous electrolyte having lithium-ion conductivity. In the lithium secondary battery, lithium metal deposits on the negative electrode during charging, and the lithium metal dissolves from the negative electrode during discharging. The nonaqueous electrolyte contains a lithium salt, and a solvent. The solvent includes a first solvent: a chain ether containing no fluorine element, a second solvent: a chain fluorinated ether having a fluorination rate of 60% or more, and a third solvent: a fluorinated ether having a fluorination rate of more than 0% and less than 60%. When the number of moles of the first solvent contained in the nonaqueous electrolyte is denoted by M1, and the number of moles of the third solvent contained in the nonaqueous electrolyte is denoted by M3, a molar ratio M1/M3 of the number of moles M1 to the number of moles M3 is 0.25 or more and less than 3.