NONAQUEOUS ELECTROLYTE CELL

摘要

Provided is a long-life manganese nonaqueous electrolyte cell of improved safety during cell malfunction. A cell (20) comprises a cylindrical container (7) having a base. The container (7) houses an electrode assembly (6) obtained by winding, around a separator (W5), a positive electrode that uses a spinel lithium-manganese composite oxide as the positive electrode active material and a negative electrode that uses a carbon material as the negative electrode active material. The electrode assembly (6) is immersed in an electrolyte obtained by adding LiBF4 as electrolyte to an organic solvent. 10 wt% of a phosphazene flame retardant is further added to the electrolyte. It is possible to render less likely ignition of the electrolyte and inhibit manganese elution during cell malfunction.