| 摘要 |
PROBLEM TO BE SOLVED: To provide a secondary battery having excellent heavy load characteristics at a high voltage and capable of suppressing production of a defective appearance by adding PC to an electrolyte containing EC, chain carbonic ester, and/or chain carbonic acid ester as main ingredients. SOLUTION: This nonaqueous electrolyte secondary battery has a structure in which a positive electrode case used also for a positive electrode terminal is sealed to a negative electrode case through a sealing material and at least a positive electrode, a negative electrode, a separator and a nonaqueous electrolyte are included, and a carbon material having a d002 spacing of not more than 0.338 nm is used for the negative electrode in it. The amount of PC added is preferably not less than 25% of an EC content in this electrolyte, and concentration of the PC to the entire electrolyte solvent is preferably not more than 17%. A positive electrode collector 2 is brought into internal contact with the inner surface of a positive electrode container 1 of stainless steel, the separator 4 is installed on the positive electrode 3 and a negative electrode carrying body 6 is provided on top of it. A negative electrode collector 7 is brought into internal contact with a negative electrode container 8, a gasket 5 is interposed in the opening part of the positive electrode container 5, the positive electrode collector 2 is sealed in the negative electrode container 8 and the electrolyte is filled. |
