Stable silicon-ionic liquid interface lithium-ion batteries

Patent metadata

Field	Value
Publication number	US-10707481-B2
Application number	US-201515522256-A
Country	US
Kind code	B2
Filing date	Oct 30, 2015
Priority date	Oct 30, 2014
Publication date	Jul 7, 2020
Grant date	Jul 7, 2020

Abstract

The disclosure includes a composition of matter including a film formed on substantially all nSi-cPAN particles included in an electrode, the film including fluorine, oxygen, sulfur, carbon and lithium.

First claim

What is claimed is:

1. An electrical energy storage device comprising:
an electrode system comprising:
an active material comprising a plurality of nanosilicon particles; and
a polyacrylonitrile polymer binding the active material and conducting electricity and lithium ions, wherein the polyacrylonitrile polymer conformally and individually coats each of the plurality of nanosilicon particles;

a second electrode; and
a room temperature ionic liquid electrolyte to contact the electrode system and the second electrode, wherein the room temperature ionic liquid electrolyte includes a positive ion species selected from the group consisting of pyrrolidinium and 1-ethyl-3-methyl-imidazolium.

2. The device of claim 1 , wherein the electrode system comprises a cyclized-polyacrylonitrile silicon nanocomposite (nSi-cPAN).

3. The device of claim 1 , wherein the electrode system comprises a nSi-cPAN and the room temperature ionic liquid electrolyte comprises a PYR13FSI.

4. The device of claim 3 wherein the electrode system comprises a bulk-type composite electrode.

5. The device of claim 4 , wherein the bulk electrode has a thickness of greater than about 5 micrometers.

6. The device of claim 1 , wherein the nanosilicon particles have a size in the range of from 1 to 500 nm.

7. The device of claim 1 , wherein the electrode system comprises about 70 wt % nanosilicon particles and about 30 wt % polyacrylonitrile polymer.

8. The device of claim 1 , wherein the electrode system has a thickness in the range of from 10 to 50 μm.

Assignees

• Univ Colorado Regents

Inventors

• Lee Se-Hee
• Martin Jerry
• Bhat Vinay
• Molina Piper Daniela
• Evans Tyler

Classifications

• Y02E60/10

  Energy storage using batteries · CPC title

• Y02P70/50

  Manufacturing or production processes characterised by the final manufactured product · CPC title

• H01M4/131

  Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx · CPC title

• H01M4/505

  of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy · CPC title

• H01M4/525

  of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy · CPC title