Non-aqueous electrolyte battery

A non-aqueous electrolyte battery comprising a positive electrode, a negative electrode, a separator, and a non-aqueous electrolyte,

• wherein the non-aqueous electrolyte contains at least one selected from the group consisting of a cyclic sultone derivative and an acid anhydride, and an electrolyte salt,
• the electrolyte salt comprises lithium salt A and lithium salt B,
• the lithium salt A comprises at least one selected from the group consisting of LiBF4, LiPF6, LiAsF6, and LiSbF6, and
• the lithium salt B comprises a lithium salt other than the lithium salt A, and
• the electrolyte salt contains the lithium salt A in an amount of 2 mol % or more.

A non-aqueous electrolyte battery comprising a positive electrode, a negative electrode, a separator, a non-aqueous electrolyte, and a sealing member,

• wherein the non-aqueous electrolyte comprises a solvent and a cyclic sultone derivative,
• the solvent contains an ether having a boiling point of 120° C. or higher,
• the non-aqueous electrolyte contains the cyclic sultone derivative in an amount of 0.5 to 5% by mass, and
• the sealing member comprises a packing made of a heat-resistant resin or glass hermetic seal.