Silicon-based energy storage devices with cyclic carbonate containing electrolyte additives

Patent metadata

Field	Value
Publication number	US-12489144-B2
Application number	US-202217884306-A
Country	US
Kind code	B2
Filing date	Aug 9, 2022
Priority date	Dec 7, 2017
Publication date	Dec 2, 2025
Grant date	Dec 2, 2025

Abstract

Electrolytes and electrolyte additives for use in energy storage devices, comprising cyclic carbonate 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 the group consisting of 4-(2,2,3,3,4,4,5,5,6,6,7,7,7-Tridecafluoroheptyl)-1,3-dioxolan-2-one, 4-[(2,2,3,3,4,4,4-Heptafluorobutoxy)methyl]-1,3-dioxolan-2-one, 4-[(2,2,3,4,4,4-Hexafluorobutoxy)methyl]-1,3-dioxolan-2-one, 4-[(2,2-Difluoroethoxy)methyl]-1,3-dioxolan-2-one, 4-[(Hexafluoroisopropoxy)methyl]-1,3-dioxolan-2-one, 4-[(1H,1H-Perfluorohexoxy)methyl]-1,3-dioxolan-2-one, 4-[(1H,1H,9H-Perfluorononoxy)methyl]-1,3-dioxolan-2-one, 4-[(1H,1H,7H-Perfluoroheptoxy)methyl]-1,3-dioxolan-2-one, 4-[(1H,1H,2H,2H-Perfluorohexoxy)methyl]-1,3-dioxolan-2-one, and 4-[(4,4,5,5,5-Pentafluoropentoxy)methyl]-1,3-dioxolan-2-one;
wherein said Si-based electrode comprises silicon particles that are substantially silicon.

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.

4 . The energy storage device of claim 3 , wherein said self-supporting composite material comprises:
greater than 70% and less than about 90% by weight of silicon particles, and greater than 0% and less than about 30% 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 together such that the silicon particles are distributed throughout the composite material.

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 substantially free of non-fluorine containing cyclic carbonate.

Assignees

• Enevate Corp

Inventors

• Ji Liwen
• Anderson Heidi
• Park Benjamin Yong

Classifications

• H01M2300/0034

  Fluorinated solvents · CPC title

• H01M4/362

  Composites · CPC title

• H01M4/625

  Carbon or graphite · CPC title

• H01M4/134

  Electrodes based on metals, Si or alloys · CPC title

• H01G11/64

  characterised by additives · CPC title