| 摘要 |
PURPOSE: A nonaqueous electrolyte secondary battery is provided to suppress the degradation of a rechargeable cycle characteristic when being charged and discharged in a high temperature environment. CONSTITUTION: A non-aqueous electrolyte secondary battery comprises: a positive electrode; a negative electrode; a separator interposed between the positive electrode and the negative electrode; and a non-aqueous electrolyte dissolving a solute in a non-aqueous solvent; wherein the negative electrode comprises a negative electrode active material containing powdered silicon and/or silicon alloy and a binding agent, and the non-aqueous electrolyte contains a fluorinated cyclic carbonate represented by a general formula (1); and wherein, when Li storage volume per unit area in the negative electrode during charging is determined as A and the theoretical maximum Li storage volume per unit area in the negative electrode is determined as B, a utilizing rate (%) of negative electrode as expressed by (A/B)*100 is 45% or less. |
