Silicon-based energy storage devices with linear carbonate 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; and

at least one electrolyte additive;

X is selected from the group consisting of an alkylene optionally substituted by

wherein the electrolyte additive is selected from the group consisting of diallyl (oxybis(ethane-2,1-diyl)) dicarbonate; 2-prop-2-enoxycarbonyloxyethyl prop-2-enyl carbonate; di(ethylene glycol) bis(allyl carbonate); 2-[2-(2-prop-2-enoxycarbonyloxyethoxy)ethoxy]ethyl prop-2-enyl carbonate; (prop-2-enoxycarbonylamino) prop-2-enyl carbonate; [4-(prop-2-enoxycarbonyloxymethyl)cyclohexyl]methyl prop-2-enyl carbonate; (2-methylcycloocten -1-yl) prop-1-en-2-yl carbonate; (2-methylcyclohepten-1-yl) prop-1-en-2-yl carbonate; prop-1-en-2-yl (2,6,6-trimethylcyclohexen-1-yl) carbonate; 2-methylallyl 2-methylcyclohex-1-enyl carbonate; prop-2-enyl (2,2,2-trichloro-1-propenoxycarbonyloxyethyl) carbonate; 2,5,8-trioxa-nonanedioic acid dimethallyl ester; 2-[2-(prop-2-enoxycarbonylamino)ethoxycarbonyloxy]ethyl 2-methylprop-2-enoate; Allyl cyclohexylidenemethyl carbonate; Allyl 6-methyl-1-cyclohexenyl carbonate; Allyl 2-ethylcyclohex-1-enyl carbonate; (2-Methylcyclohepten-1-yl) prop-1-en-2-yl carbonate; Allyl cyclopent-1-en-1-yl carbonate; Allyl cyclohex-1-en-1-yl carbonate; Allyl (4-phenylbut-3-en-2-yl) carbonate; Allyl 2-methyl-3,4-dihydronaphthalen-1-yl carbonate; Dimethallyl carbonate 4-prop-2-enoyloxybutyl 2-methylprop-2-enoate; [3-prop-2-enoxycarbonyloxy-2,2-bis(prop-2-enoxycarbonyloxymethyl)propyl] prop-2-enyl carbonate; prop-2-enyl 2-prop-2-enoxycarbonyloxypropanoate; and prop-2-enyl 2-prop-2-enoxycarbonyloxyprop-2-enoate.

2. The energy storage device of claim 1 , wherein the second electrode is a Si-dominant electrode, where silicon is the majority of the active material used in the electrode by weight.

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 about 90% by weight of silicon particles, and

greater than 0% and less than about 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 substantially 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 the electrolyte further comprises fluoroethylene carbonate (FEC).

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