LITHIUM SULFUR SECONDARY BATTERY

摘要

PROBLEM TO BE SOLVED: To provide a lithium sulfur secondary battery 10 whose reduction in charging/discharging capacity is prevented.SOLUTION: A lithium sulfur secondary battery 10 includes: a positive electrode 20 containing a sulphur-based positive electrode; an electrolyte 35; and a negative electrode 40 containing a negative electrode active material for occluding and desorbing lithium. The lithium sulfur secondary battery 10 further includes a polymer film 25 that covers a surface of the positive electrode 20, allows lithium cation to pass through, but does not allow polysulfide anion to pass through.