NOVELTY - Non-aqueous electrolyte secondary battery (I) 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, where 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 compound (1a).    USE - Used as non-aqueous electrolyte secondary battery.    ADVANTAGE - (I) has higher battery capacity and prevents a great decrease of capacity resulting from charging and discharging under high temperature so that excellent charge-discharge cycle performances under high temperature can be obtained.    DETAILED DESCRIPTION - Non-aqueous electrolyte secondary battery (I) 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, where 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 compound of formula (1a), where, when lithium storage volume per unit area in the negative electrode during charging is determined as A and the theoretical maximum lithium storage volume per unit area in the negative electrode is determined as B, a utilizing rate (%) of negative electrode as expressed by (A/B)x 100 is 45% or less.    R1-R4 = H, F or alkyl group and contain at least one fluorine group and one alkyl group respectively.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic plain view showing a non-aqueous electrolyte secondary battery.    Positive electrode current collector tub (1a)    Negative electrode current collector tub (2a)    Flat electrode; (10)    Battery case. (20)