Electrolyte composition comprising oligomeric silyl ester phosphonates

2:

• The electrolyte composition of claim 1, wherein the at least one silyl ester phosphonate comprises the structure of formula (II):
• wherein Q1 is a chemical bond or a monomeric or oligomeric group comprising one or more monomeric units of formula (II.1), and Q2 is a chemical bond or a monomeric or oligomeric group comprising one or more monomeric units of formula (II.2):
• wherein each T* is independently Si or Si—(CH2)x—Si, wherein x is an integer of 0 to 6, one or more CH2 groups of Si—(CH2)x—Si are optionally replaced by O, and one or more H of Si—(CH2)—Si are optionally replaced by C1-C4 alkyl,
• wherein if T* is Si:
• q1 is an integer from zero to 2,
• q2 is an integer from zero to 2, and
• q1+q2=2,
• wherein if T* is Si—(CH2)x—Si:
• q1 is an integer from zero to 4,
• q2 is an integer from zero to 4, and
• q1+q2=4;
• and
• wherein—* is a continuation of the silylester phosphonate backbone by branching.

3:

• The electrolyte composition of claim 2, wherein the at least one silyl ester phosphonate has the formula (III):
• wherein R6 and R7 are each independently selected from the group consisting of R8, Si(OR8)3, and Si(R9)3;
• wherein each R8 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,
• wherein each R8 is optionally substituted by one or more substituents selected from CN and F, and wherein one or more CH2-groups of alkyl, alkenyl, and alkynyl which are not directly bound to O or Si are optionally replaced by O;
• and
• wherein each R9 is independently selected from the group consisting of H, F, Cl, C1-C10 alkyl, C3-C7 (hetero)cycloalkyl, C2-C10 alkenyl, C2-C10 alkynyl, C5-C7 (hetero)aryl, and C6-C13 (hetero)aralkyl,
• wherein each R9 is optionally substituted by one or more substituents selected from CN and F, and wherein one or more CH2-groups of alkyl, alkenyl, and alkynyl which are not directly bound to O are optionally replaced by O.

7:

• The electrolyte composition of claim 1,
• wherein each R3 is independently selected from the group consisting of H and C1-C10 alkyl,
• wherein each R3 is optionally substituted by one or more F and/or CN, and
• wherein one or more CH2-groups of the C1-C10 alkyl which are not directly bound to P are optionally replaced by O.

9:

• The electrolyte composition of claim 1, wherein the at least one aprotic organic solvent is selected from the group consisting of
• a fluorinated cyclic organic carbonate, a non-fluorinated cyclic organic carbonate, a fluorinated acyclic organic carbonate, and a non-fluorinated acyclic organic carbonate,
• a fluorinated ether, a non-fluorinated ether, a fluorinated polyether, a non-fluorinated polyether,
• a fluorinated cyclic ether, a non-fluorinated cyclic ether,
• a fluorinated cyclic acetal, a non-fluorinated cyclic acetal, a fluorinated cyclic ketal, a non-fluorinated cyclic ketal, a fluorinated acyclic acetal, a non-fluorinated acyclic acetal, a fluorinated acyclic ketal, a non-fluorinated acyclic ketal,
• a fluorinated orthocarboxylic acid ester, a non-fluorinated orthocarboxylic acid ester,
• a fluorinated cyclic ester of a carboxylic acid, a non-fluorinated cyclic ester of a carboxylic acid, a fluorinated cyclic diester of a carboxylic acid, a non-fluorinated cyclic diester of a carboxylic acid, a fluorinated acyclic ester of a carboxylic acid, a non-fluorinated acyclic ester of a carboxylic acid, a fluorinated acyclic diester of a carboxylic acid, a non-fluorinated acyclic diester of a carboxylic acid,
• a fluorinated cyclic sulfone, a non-fluorinated cyclic sulfone, a fluorinated acyclic sulfone, a non-fluorinated acyclic sulfone,
• a fluorinated cyclic nitrile, a non-fluorinated cyclic nitrile, a fluorinated cyclic dinitrile, a non-fluorinated cyclic dinitrile, a fluorinated acyclic nitrile, a non-fluorinated acyclic nitrile, a fluorinated acyclic dinitrile, a non-fluorinated acyclic dinitrile,
• a fluorinated cyclic phosphate, a non-fluorinated cyclic phosphate, a fluorinated acyclic phosphate, and a non-fluorinated acyclic phosphate.

13:

• 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 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-C 10 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;
• and
• 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.