Silicon-based energy storage devices with fluorinated cyclic compound containing electrolyte additives

Patent metadata

Field	Value
Publication number	US-2019181441-A1
Application number	US-201816213973-A
Country	US
Kind code	A1
Filing date	Dec 7, 2018
Priority date	Dec 7, 2017
Publication date	Jun 13, 2019
Grant date	—

Abstract

Electrolytes and electrolyte additives for energy storage devices comprising fluorinated cyclic compounds.

First claim

What is claimed is:

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 comprising a compound selected from Formulae (A), (B), (C), (D), (E), (F) and (G):

wherein:
each X is independently

each R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , R 7 , R 8 , R 9 , and R 10 is independently selected from the group consisting of —H, —F, and a C1-C8 alkyl substituted by F; wherein at least one of R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , R 7 , R 8 , R 9 , and R 10 is —F or a C1-C8 alkyl substituted by F; and
each R 11 , R 12 , and R 13 is —H or a C1-C8 alkyl substituted by F, wherein at least one of R 11 , R 12 , and R 13 is a C1-C8 alkyl substituted by F.

2 . The energy storage device of claim 1 , wherein:
each R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , R 7 , R 8 , R 9 , and R 10 is independently selected from the group consisting of —H, —F, and —CF 3 .

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

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

5 . The energy storage device of claim 4 , 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.

6 . The energy storage device of claim 1 , wherein the electrolyte further comprises fluoroethylene carbonate (FEC).

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

8 . The energy storage device of claim 1 , wherein the electrolyte additive is selected from the group consisting of a fluorinated succinic anhydride, a fluorinated glutaric anhydride, a fluorinated maleic anhydride, a fluorinated adipic acid anhydride, a fluorinated pimelic anhydride, a fluorinated succinimide, a fluorinated glutarimide, a fluorinated maleimide, a fluorinated 1-propanephosphonic acid cyclic anhydride, and a fluorinated 2-sulfobenzoic acid cyclic anhydride.

Assignees

• Enevate Corp

Inventors

• Ji Liwen
• Park Benjamin Yong

Classifications

• H01M4/362

  Composites · CPC title

• H01M4/386 Primary

  Silicon or alloys based on silicon · CPC title

• H01M4/485

  of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy (H01M4/505, H01M4/525 take precedence) · CPC title

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• C04B35/522

  Graphite (C04B35/536 takes precedence) · CPC title