Cyclic dinitrile compounds as additives for electrolyte

1:

• An electrolyte composition comprising a compound of formula (I):
• wherein
• X1 and X2 are selected independently from each other from N and P;
• R1 and R2 are selected independently from each other from R4, OR4, SR4, S(O)R4, S(O)2R4, OS(O)2R4, S(O)2OR4, OSiR83, and NR5R6, and in case X1 and X2 are both CR3R1 and R2 may also be selected from F, CN, C(O)OR4, and OC(O)R4,
• or R1 and R2 are combined and form together with the C—C bond a 5- to 7-membered cycle, which may be substituted by one or more groups selected from F, CN, R4, OR4, SR4, S(O)R4, S(O)2R4, OS(O)2R4, S(O)2OR4, OSiR83, and NR5R6;
• R4 is selected from C1 to C12 alkyl, C3-C6 (hetero)cycloalkyl, C2 to C12 alkenyl, C2 to C12 alkynyl, C5 to C12 (hetero)aryl, and C6 to C24 (hetero)aralkyl, wherein alkyl, (hetero)cycloalkyl, alkenyl, alkynyl, (hetero)aryl, and (hetero)aralkyl may be substituted by one or more substituents selected from F, CN, C(O)OR7, OC(O)R7, OR7, and SR7;
• R5 and R6 are selected independently from each other from H, C1 to C12 alkyl, C3-C6 (hetero)cycloalkyl, C2 to C12 alkenyl, C2 to C12 alkynyl, C to C12 (hetero)aryl, and C6 to C24 (hetero)aralkyl, wherein alkyl, (hetero)cycloalkyl, alkenyl, alkynyl, (hetero)aryl, and (hetero)aralkyl may be substituted by one or more substituents selected from F and CN;
• or R5 and R6 may be combined to form together with the C- or N-atom a 5- to 7-membered heterocycle which may be substituted by one or more substituents selected from F, CN, C1 to C12 alkyl, C3-C6 (hetero)cycloalkyl, C2 to C12 alkenyl, C2 to C12 alkynyl, C5 to C12 (hetero)aryl, and C6 to C24 (hetero)aralkyl, wherein alkyl, (hetero)cycloalkyl, alkenyl, alkynyl, (hetero)aryl, and (hetero)aralkyl may be substituted by one or more substituents selected from F and CN;
• R7 is selected from C1 to C12 alkyl, C3-C6 (hetero)cycloalkyl, C2 to C12 alkenyl, C2 to C12 alkynyl, C5 to C12 (hetero)aryl, and C6 to C24 (hetero)aralkyl which may be substituted by one or more substituents selected from F and CN;
• and
• R8 is independently selected from R4 and OR4.