PERFORMANCE IMPROVEMENTS OF SILICON-DOMINANT ANODE CONTAINING LITHIUM ION BATTERIES THROUGH THE USE OF FLUORINATED ESTER/CARBONATES/AROMATIC COMPOUNDS AND MULTIPLE ADDITIVE COMBINATION CONTAINING ELECTROLYTES

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; and

an electrolyte composition; wherein said electrolyte composition comprises:

at least one carbonate solvent,

at least one further solvent as a co-solvent, wherein said co-solvent is selected from the group consisting of a carbonate solvent, a fluorinated aromatic compound solvent, an aromatic compound solvent, a fluorinated ester solvent, a fluorinated ether solvent, a fluorinated phosphorous-containing compound solvent andr a fluorinated sulfur-containing compound solvent;

at least one Li salt; and

at least one electrolyte additive compound.

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 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 carbonate solvent is one or more of cyclic carbonates, linear carbonates, fluorine-containing cyclic carbonates and/or fluorine-containing linear carbonates.

6 . The energy storage device of claim 1 , wherein said electrolyte composition comprises at least two further solvents as co-solvents, wherein said further solvents are selected from the group consisting of one or more carbonate solvents, fluorinated aromatic compound solvents, aromatic compound solvents, fluorinated ester solvents, fluorinated ether solvents, fluorinated phosphorous-containing compound solvents and/or fluorinated sulfur-containing compound solvents.

7 . The energy storage device of claim 5 , wherein the carbonate solvent is selected from the group consisting of one or more of ethylene carbonate (EC), propylene carbonate (PC), trifluoropropylene carbonate (TFPC), fluoroethylene carbonate (FEC), difluoroethylene carbonate (F2EC), trifluoroethylene carbonate (F3EC), ethylmethyl carbonate (EMC), diethyl carbonate (DEC), dimethyl carbonate (DMC), methyl 2,2,2-trifluoroethyl carbonate (TFEMC), ethyl 2,2,2-trifluoroethyl carbonate (TFDEC), difluoromethyl fluoromethyl carbonate (TFDMC), bis(2,2-difluoroethyl) carbonate; 2,2-difluoroethyl 2,2,2-trifluoroethyl carbonate; 2,2-difluoroethyl hexafluoroisopropyl carbonate; bis(2,2,2-trifluoroethyl) carbonate; 2,2,3,3,3-pentafluoropropyl 2,2,2-trifluoroethyl carbonate; 2,2-difluoroethyl ethyl carbonate (2F-DEC); 2,2-difluoroethyl methyl carbonate (2F-EMC); Methyl 2,2,2-trifluoroethyl carbonate (3F-EMC), and combinations thereof.

8 . The energy storage device of claim 1 , wherein said co-solvent is selected from the group consisting of one or more of ethyl trifluoroacetate, bis(2,2,2-trifluoroethyl)ether, 2,2,2-trifluoroethyl ether, 2-fluoro-1-ethoxybenzene, 1,1,2,2-tetrafluoroethyl 2,2,3,3-tetrafluoropropyl ether (TTE), 2,2,2-trifluoroethyl trifluoroacetate, 2,2,2-trifluoroethyl formate, methyl trifluoroacetate, phenyl trifluoroacetate, ethyl-4,4,4-trifluoroacetoacetate, 2,2,2-trifluoroethyl butyrate, trifluoroacetic anhydride, tris(1,1,1,3,3,3-hexafluoro-2-propyl) phosphite, tris(1,1,1,3,3,3-hexafluoropropan-2-yl) phosphite (THFPP), tris(1,1,1,3,3,3-hexafluoro-2-propyl) phosphate, 4-fluoro-1,3,2-dioxathiolane 2,2-dioxide, bis(2,2,2-trifluoroethyl) sulfate, 4,5-difluoro-1,3,2-dioxathiolane 2,2-dioxide, benzene, toluene, xylene, naphthalene, anthracene, phenanthrene, fluorobenzene (FB), 1,2-difluorobenzene, 1,3-difluorobenzene, 1,4-difluorobenzene, hexafluorobenzene, 1,3,5-trifluorobenzene, ethylene carbonate (EC), propylene carbonate (PC), trifluoropropylene carbonate (TFPC), fluoroethylene carbonate (FEC), difluoroethylene carbonate (F2EC), trifluoroethylene carbonate (F3EC), ethylmethyl carbonate (EMC), diethyl carbonate (DEC), dimethyl carbonate (DMC), methyl 2,2,2-trifluoroethyl carbonate (TFEMC), ethyl 2,2,2-trifluoroethyl carbonate (TFDEC), difluoromethyl fluoromethyl carbonate (TFDMC), bis(2,2-difluoroethyl) carbonate; 2,2-difluoroethyl 2,2,2-trifluoroethyl carbonate; 2,2-difluoroethyl hexafluoroisopropyl carbonate; bis(2,2,2-trifluoroethyl) carbonate; 2,2,3,3,3-pentafluoropropyl 2,2,2-trifluoroethyl carbonate; 2,2-difluoroethyl ethyl carbonate (2F-DEC); 2,2-difluoroethyl methyl carbonate (2F-EMC); methyl 2,2,2-trifluoroethyl carbonate (3F-EMC), and combinations thereof.

9 . The energy storage device of claim 1 , wherein the electrolyte additive compound is selected from the group consisting of one or more of phosphazenes, phosphates, phosphites, phosphonates, borates, sulfates, fluorinated sulfur-containing compounds, or derivatives thereof.

10 . The energy storage device of claim 9 , wherein the electrolyte additive compound is selected from the group consisting of one or more of tris(trimethly-silyl)phosphate (TMSP), tris(trimethylsilyl) phosphite (TMSPi), Triallyl Phosphate, trimethylsilylpolyphosphate lithium difluorophosphate (LiPO2F2), lithium difluoro bis(oxalato)phosphate (LiDFOP), Ethoxy(pentafluoro)cyclotriphosphazene (5F-FPN), Pentafluoro(phenoxy)cyclotriphosphazene (FPPN), Hexaallyloxyphosphazene (HALPZ), Hexakis(allylamino)cyclotriphosphazene (HALCPZ), lithium difluoro(oxalato)borate (LiDFOB), Lithium bis(oxolato)borate (LiBOB), Tris (trimethylsilyl) borate (TMSB), Tris(2,2,2-trifluoroethyl)borate, Trimethyl borate, Triethyl borate, Tripropyl borate, Triphenyl borate, ethylene sulfate (1,3,2-dioxathiolane-2,2-dioxide, DTD), Perfluoroallylfluorosulfate (PFAFSA), 1,3-propanediolcyclicsulfate, propylene sulfate, and combinations thereof

11 . A method of making an energy storage device, the method comprising:

forming an energy storage device comprising a cathode, an anode, and an electrolyte composition, wherein said electrolyte composition comprises:

at least one carbonate solvent,

at least one further solvent as a co-solvent, wherein said co-solvent is selected from the group consisting of a carbonate solvent, a fluorinated aromatic compound solvent, an aromatic compound solvent, a fluorinated ester solvent, a fluorinated ether solvent, a fluorinated phosphorous-containing compound solvent andr a fluorinated sulfur-containing compound solvent;

at least one Li salt; and

at least one electrolyte additive compound; and

wherein said one or both of said cathode and said anode is formed using, at least, the following steps:

the electrode material is mixed to create a slurry;

said electrolyte composition is added to said slurry;

said slurry is coated on metal foil; and

the coated metal foil is dried.

12 . The method of claim 11 , wherein the second electrode is a Si-dominant electrode.

13 . The method of claim 11 , wherein the second electrode comprises a self-supporting composite material film.

14 . The method of claim 13 , 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.

15 . The method of claim 11 , wherein the carbonate solvent is one or more of cyclic carbonates, linear carbonates, fluorine-containing cyclic carbonates and/or fluorine-containing linear carbonates.

16 . The method of claim 11 , wherein said electrolyte composition comprises at least two further solvents as co-solvents, wherein said co-solvents are selected from the group consisting of one or more carbonate solvents, fluorinated aromatic compound solvents, aromatic compound solvents, fluorinated ester solvents, fluorinated ether solvents, fluorinated phosphorous-containing compound solvents and/or fluorinated sulfur-containing compound solvents.

17 . The method of claim 15 , wherein the carbonate solvent is selected from the group consisting of one or more of ethylene carbonate (EC), propylene carbonate (PC), trifluoropropylene carbonate (TFPC), fluoroethylene carbonate (FEC), difluoroethylene carbonate (F2EC), trifluoroethylene carbonate (F3EC), ethylmethyl carbonate (EMC), diethyl carbonate (DEC), dimethyl carbonate (DMC), methyl 2,2,2-trifluoroethyl carbonate (TFEMC), ethyl 2,2,2-trifluoroethyl carbonate (TFDEC), difluoromethyl fluoromethyl carbonate (TFDMC), bis(2,2-difluoroethyl) carbonate; 2,2-difluoroethyl 2,2,2-trifluoroethyl carbonate; 2,2-difluoroethyl hexafluoroisopropyl carbonate; bis(2,2,2-trifluoroethyl) carbonate; 2,2,3,3,3-pentafluoropropyl 2,2,2-trifluoroethyl carbonate; 2,2-difluoroethyl ethyl carbonate (2F-DEC); 2,2-difluoroethyl methyl carbonate (2F-EMC); Methyl 2,2,2-trifluoroethyl carbonate (3F-EMC), and combinations thereof.

18 . The method of claim 11 , wherein said co-solvent is selected from the group consisting of one or more of ethyl trifluoroacetate, bis(2,2,2-trifluoroethyl)ether, 2,2,2-trifluoroethyl ether, 2-fluoro-1-ethoxybenzene, 1,1,2,2-tetrafluoroethyl 2,2,3,3-tetrafluoropropyl ether (TTE), 2,2,2-trifluoroethyl trifluoroacetate, 2,2,2-trifluoroethyl formate, methyl trifluoroacetate, phenyl trifluoroacetate, ethyl-4,4,4-trifluoroacetoacetate, 2,2,2-trifluoroethyl butyrate, trifluoroacetic anhydride, tris(1,1,1,3,3,3-hexafluoro-2-propyl) phosphite, tris(1,1,1,3,3,3-hexafluoropropan-2-yl) phosphite (THFPP), tris(1,1,1,3,3,3-hexafluoro-2-propyl) phosphate, 4-fluoro-1,3,2-dioxathiolane 2,2-dioxide, bis(2,2,2-trifluoroethyl) sulfate, 4,5-difluoro-1,3,2-dioxathiolane 2,2-dioxide, benzene, toluene, xylene, naphthalene, anthracene, phenanthrene, fluorobenzene (FB), 1,2-difluorobenzene, 1,3-difluorobenzene, 1,4-difluorobenzene, hexafluorobenzene, 1,3,5-trifluorobenzene, ethylene carbonate (EC), propylene carbonate (PC), trifluoropropylene carbonate (TFPC), fluoroethylene carbonate (FEC), difluoroethylene carbonate (F2EC), trifluoroethylene carbonate (F3EC), ethylmethyl carbonate (EMC), diethyl carbonate (DEC), dimethyl carbonate (DMC), methyl 2,2,2-trifluoroethyl carbonate (TFEMC), ethyl 2,2,2-trifluoroethyl carbonate (TFDEC), difluoromethyl fluoromethyl carbonate (TFDMC), bis(2,2-difluoroethyl) carbonate; 2,2-difluoroethyl 2,2,2-trifluoroethyl carbonate; 2,2-difluoroethyl hexafluoroisopropyl carbonate; bis(2,2,2-trifluoroethyl) carbonate; 2,2,3,3,3-pentafluoropropyl 2,2,2-trifluoroethyl carbonate; 2,2-difluoroethyl ethyl carbonate (2F-DEC); 2,2-difluoroethyl methyl carbonate (2F-EMC); methyl 2,2,2-trifluoroethyl carbonate (3F-EMC), and combinations thereof.

19 . The method of claim 11 , wherein the electrolyte additive compound is selected from the group consisting of one or more of phosphazenes, phosphates, phosphites, phosphonates, borates, sulfates, fluorinated sulfur-containing compounds, or derivatives thereof.

20 . The method of claim 19 , wherein the electrolyte additive compound is selected from the group consisting of one or more of tris(trimethly-silyl)phosphate (TMSP), tris(trimethylsilyl) phosphite (TMSPi), Triallyl Phosphate, trimethylsilylpolyphosphate lithium difluorophosphate (LiPO2F2), lithium difluoro bis(oxalato)phosphate (LiDFOP), Ethoxy(pentafluoro)cyclotriphosphazene (5F-FPN), Pentafluoro(phenoxy)cyclotriphosphazene (FPPN), Hexaallyloxyphosphazene (HALPZ), Hexakis(allylamino)cyclotriphosphazene (HALCPZ), lithium difluoro(oxalato)borate (LiDFOB), Lithium bis(oxolato)borate (LiBOB), Tris (trimethylsilyl) borate (TMSB), Tris(2,2,2-trifluoroethyl)borate, Trimethyl borate, Triethyl borate, Tripropyl borate, Triphenyl borate, ethylene sulfate (1,3,2-dioxathiolane-2,2-dioxide, DTD), Perfluoroallylfluorosulfate (PFAFSA), 1,3-propanediolcyclicsulfate, propylene sulfate, and combinations thereof.