Nonaqueous secondary battery with nitrile group-containing compound

A nonaqueous secondary battery comprising:

• a positive electrode plate formed with a positive electrode binder layer having a lithium composite oxide as a positive electrode active material;
• a negative electrode plate;
• a separator;
• and
• a nonaqueous electrolyte,
• the nonaqueous electrolyte containing a nitrile group-containing compound at a concentration of 0.05% by mass or more with respect to the total mass of the nonaqueous electrolyte,
• the positive electrode active material having an average particle diameter of 4.5 to 15.5 pm and a specific surface area of 0.13 to 0.80 m2/g, and
• the positive electrode binder layer containing at least one of a silane coupling agent and a coupling agent represented by General Formula (I) at a content of 0.003% by mass or more and 5% by mass or less with respect to the mass of the positive electrode active material:
• (where M is Al, each of R1 and R2 is an alkyl group or an alkoxy group having 1 to 18 carbon atoms, and n represents an integer of 1 to 4),
• wherein the nitrile group-containing compound is a dinitrile compound represented by General Formula (II):
• NC—R—CN (II)
• (where R is an alkyl chain having 2 to 8 carbon atoms).

A nonaqueous secondary battery comprising:

• a positive electrode plate formed with a positive electrode binder layer having a lithium composite oxide as a positive electrode active material;
• a negative electrode plate;
• a separator;
• and
• a nonaqueous electrolyte,
• the nonaqueous electrolyte containing a nitrile group-containing compound at a concentration of 0.05% by mass or more with respect to the total mass of the nonaqueous electrolyte,
• the positive electrode active material having an average particle diameter of 4.5 to 15.5 pm and a specific surface area of 0.13 to 0.80 m2/g, and
• the positive electrode binder layer containing a silane coupling agent at a content of 0.003% by mass or more and 5% by mass or less with respect to the mass of the positive electrode active material,
• wherein the nitrile group-containing compound is a dinitrile compound represented by General Formula (II):
• NC—R—CN (II)
• (where R is an alkyl chain having 2 to 8 carbon atoms).