Silicon-based energy storage devices with anhydride containing electrolyte additives

1. An energy storage device comprising:

a first electrode and a second electrode, wherein at least one of the first electrode and the second electrode is a Si-based electrode;

a separator between the first electrode and the second electrode;

an electrolyte composition comprising a carbonate solvent, a Li-containing salt and at least one electrolyte additive;

wherein said at least one electrolyte additive comprises a compound of Formula (A):

wherein:

A is

each Y and Z is independently selected from

i is 1 or 2;

each R 1 and R 2 is independently selected from the group consisting of —R a and —OR b ;

each R a and R b is independently selected from the group consisting of a C1-C14 alkyl, a C2-C6 alkenyl, a C2-C6 alkynyl, a C1-C14 heteroalkyl with 1 or more O heteroatoms, a C3-C6 cycloalkyl, an unsaturated C3-C6 cycloalkyl, a C5-C10 polycyclic cycloalkyl, a C5-C6 aromatic and a C5-C6 heteroaromatic, wherein at least one of R a or R b is substituted by —F.

2. The energy storage device of claim 1 , wherein the second electrode is a Si-dominant electrode.

3. The energy storage device of claim 1 , wherein the second electrode comprises a self-supporting composite material film.

4. The energy storage device of claim 3 , wherein the composite material film comprises:

greater than 0% and less than 90% by weight of silicon particles, and

greater than 0% and less than 90% by weight of one or more types of carbon phases, wherein at least one of the one or more types of carbon phases is a continuous phase that holds the composite material film together such that the silicon particles are distributed throughout the composite material film.

5. The energy storage device of claim 1 , wherein said carbonate solvent comprises fluoroethylene carbonate (FEC).

6. The energy storage device of claim 5 , wherein the electrolyte is free of non-fluorine containing cyclic carbonate.