LITHIUM SECONDARY BATTERY AND METHOD FOR MANUFACTURING SAME

摘要

Provided are: a lithium secondary battery wherein gas generation associated with the charging and discharging can be suppressed even in cases where silicon and silicon oxide are contained as negative electrode active materials, and wherein deformation due to the gas generation can be suppressed even in cases where a resin film is used as the outer package; and a method for manufacturing the lithium secondary battery. A lithium secondary battery of the present invention comprises a negative electrode that has a negative electrode active material, a positive electrode that has a positive electrode active material, and an electrolyte solution in which the negative electrode active material and the positive electrode active material are immersed. The negative electrode active material contains silicon and silicon oxide that have been subjected to a reduction treatment.