Oxiranyl ester derivatives as additive for electrolytes in lithium ion batteries

An electrolyte composition (A) comprising:

• (i) an aprotic organic solvent;
• (ii) a conducting salt;
• (iii) a compound of formula (I)
• wherein
• R1 is selected from the group consisting of C(O)C(O)OR7, S(O)2R7, S(O)2OR7, (CH2)sSO2(CH2)tR7, P(O)(OR7)R7, and P(O)(OR7)2;
• R2 is selected from the group consisting of H, F, C1-C6 alkyl, C3-C6 (hetero)cycloalkyl, C2-C6 alkenyl, C3-C6 (hetero)cycloalkenyl, C2-C6 alkynyl, C5-C7 (hetero)aryl, and C6-C13 aralkyl, wherein alkyl, (hetero)cycloalkyl, aralkyl, alkenyl, (hetero)cycloalkenyl, alkynyl, and (hetero)aryl may be substituted by one or more substituents selected from the group consisting of F, CN, C1-C6 alkyl, C3-C6 (hetero)cycloalkyl, C2-C6 alkenyl, C5-C7 (hetero)aryl, OR8, C(O)R8, C(O)OR8, OC(O)R8, OC(O)OR8, OC(O)C(O)OR8, S(O)2OR8 and OS(O)2R8;
• R3 and R4 are each independently selected from the group consisting of H, F, C1-C6 alkyl, C3-C6 (hetero)cycloalkyl, C2-C6 alkenyl, C3-C6 (hetero)cycloalkenyl, C2-C6 alkynyl, C5-C7 (hetero)aryl, and C6-C13 aralkyl, wherein alkyl, (hetero)cycloalkyl, alkenyl, (hetero)cycloalkenyl, alkynyl, (hetero)aryl, and aralkyl, may be substituted by one or more substituents selected from the group consisting of F, CN, and optionally fluorinated oxiranyl;
• R5 and R6 are each independently selected from the group consisting of H, C1-C6 alkyl, C3-C6 (hetero)cycloalkyl, C2-C6 alkenyl, C3-C6 (hetero)cycloalkenyl, C2-C6 alkynyl, C5-C7 (hetero)aryl, and C6-C13 aralkyl, wherein alkyl, (hetero)cycloalkyl, aralkyl, alkenyl, (hetero)cycloalkenyl, alkynyl, and (hetero)aryl may be substituted by one or more substituents selected from the group consisting of F, CN, and optionally fluorinated oxiranyl;
• R7 is selected from the group consisting of C1-C6 alkyl, C3-C6 (hetero)cycloalkyl, C2-C6 alkenyl, C3-C6 (hetero)cycloalkenyl, C2-C6 alkynyl, C5-C7 (hetero)aryl, and C6-C13 aralkyl, wherein alkyl, (hetero)cycloalkyl, aralkyl, alkenyl, (hetero)cycloalkenyl, alkynyl, and (hetero)aryl may be substituted by one or more substituents selected from the group consisting of F, CN, C1-C6 alkyl, C2-C6 alkenyl, C5-C7 (hetero)aryl, OR9, OC(O)R9, C(O)R9, C(O)OR9, OC(O)OR9, OC(O)C(O)OR9, S(O)2OR9, OS(O)2R9, and C3-C6 (hetero)cycloalkyl which may be substituted by one or more substituents selected from the group consisting of F, C1-C6 alkyl, C3-C6 (hetero)cycloalkyl, C2-C6 alkenyl, C3-C6 (hetero)cycloalkenyl, C2-C6 alkynyl, C5-C7 (hetero)aryl, and C6-C13 aralkyl, wherein alkyl, (hetero)cycloalkyl, aralkyl, alkenyl, (hetero)cycloalkenyl, alkynyl, and (hetero)aryl may be substituted by one or more substituents selected from the group consisting of F, CN, and optionally fluorinated oxiranyl;
• R8 and R9 are each independently selected from the group consisting of H, C1-C6 alkyl, C3-C6 (hetero)cycloalkyl, C2-C6 alkenyl, C3-C6 (hetero)cycloalkenyl, C2-C6 alkynyl, C5-C7 (hetero)aryl, and C6-C13 aralkyl, wherein alkyl, (hetero)cycloalkyl, aralkyl, alkenyl, (hetero)cycloalkenyl, alkynyl, and (hetero)aryl may be substituted by one or more substituents selected from the group consisting of F, CN, and optionally fluorinated oxiranyl;
• wherein s and t are independently from each other 1, 2, or 3;
• and
• (iv) optionally a further additive.