NOVELTY - A nonaqueous electrolyte comprises an electrolytic salt dissolved in a nonaqueous solvent. The nonaqueous electrolyte comprises a phenyl ester compound (I) with benzene ring substituted by both halogen atom and fluoroalkyl group.    USE - Nonaqueous electrolyte is used in electrical storage device (claimed) e.g. lithium secondary battery. Uses include but are not limited to mobile telephones, notebook computers, electric vehicles, tablet terminals, and ultrabooks.    ADVANTAGE - The nonaqueous electrolyte improves the electrochemical characteristics when the electrical storage device is used at a high temperature, suppresses generation of gas, and improves capacity retention ratio after high-temperature cycle.    DETAILED DESCRIPTION - A nonaqueous electrolyte comprises an electrolytic salt dissolved in a nonaqueous solvent. The nonaqueous electrolyte comprises a phenyl ester compound of formula (I), with benzene ring substituted by both halogen atom and fluoroalkyl group.    R'f=1-6C fluoroalkyl;    X=halo;    p,q=1-4;    (p+q)=5 or less;    A=-S(=O)2-, -C(=O)-, -C(=O)-O-, -C(=O)-L1-C(=O)-, -C(=O)-L2-P(=O)(OR)-O-, or -P(=O)(OR)-O-;    Y'=fluoro, H, or 1-6C alkyl, 2-6C alkenyl, 3-6C alkynyl, or 6-12C aryl (all optionally substituted by halo);    L1=1-8C alkylene, 2-8C alkenylene, or 2-8C alkynylene (all optionally substituted by halo), or direct bond;    L2=1-8C alkylene optionally substituted by halo;and    R=1-6C alkyl optionally substituted by halo.    Y' is fluoro when A is -S(=O)2-, and H when A is -C(=O)-. INDEPENDENT CLAIMS are included for the following:    (1) electrical storage device provided with the nonaqueous electrolyte, a positive electrode, and a negative electrode; and    (2) phenyl ester compound of formula (II).    R'f1=1-6C fluoroalkyl;    X1=halo;    A1=-S(=O)2-, -C(=O)-, -C(=O)-O-, -C(=O)-L3-C(=O)-, -C(=O)-L4-P(=O)(OR1)-O-, or -P(=O)(OR1)-O-;    Y'1=fluoro, H, or 1-6C alkyl, 2-6C alkenyl, 3-6C alkynyl, or 6-12C aryl (all optionally substituted by halo);    L3=1-8C alkylene, 2-8C alkenylene, or 2-8C alkynylene (all optionally substituted by halo), or direct bond;    L4=1-8C alkylene optionally substituted by halo;and    R1=1-6C alkyl optionally substituted by halo.    The compound in which A1 is -S(=O)2- and Y'1 is trifluoromethyl is excluded.