Patent ID: 11936002
Assignee: BASF SE
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 10:
11. A method of making an electrochemical cell, comprising:
providing an electrolyte composition along with a positive electrode and a negative electrode, wherein the electrolyte composition comprises:
a aprotic organic solvent;
a conducting salt comprising at least one lithium salt; and
a silyl ester phosphonate comprising the structure of formula (I):, wherein:
T is selected from the group consisting of, p is an integer from 0 to 6;
one or more CH2 groups of (CH2)p are optionally replaced by O;
one or more H of (CH2)p are optionally replaced by C1-C4 alkyl;
each R1 is independently selected from the group consisting of H, F, Cl, R4, OR4, OSi(R5)3, OSi(OR4)3, and OP(O)(OR4)R5;
each R4 is independently selected from the group consisting of C1-C10 alkyl, C3-C7 (hetero)cycloalkyl, C2-C10 alkenyl, C2-C10 alkynyl, C5-C7 (hetero)aryl, and C6-C13 (hetero)aralkyl;
each R4 is independently and optionally substituted by one or more substituents selected from the group consisting of CN and F;
one or more CH2-groups of alkyl, alkenyl, and alkynyl, if present in R4 and not directly bound to Si or O are optionally replaced by O;
R3 and R5 are each independently selected from the group consisting of H, F, C1-C10 alkyl, C3-C7 (hetero)cycloalkyl, C2-C10 alkenyl, C2-C10 alkynyl, C5-C7 (hetero)aryl, and C6-C13 (hetero)aralkyl;
each optionally substituted by one or more substituents selected from the group consisting of CN and F;
one or more CH2-groups of alkyl, alkenyl, and alkynyl, if present in R3 and/or R5 and not directly bound to P, are optionally replaced by O,
wherein the electrolyte composition comprises 0.01 to 10 wt.-% of the at least one silyl ester phosphonate based on the total weight of the electrolyte composition; and

containing the electrolyte composition in an electrochemical cell.