Coke sourced anode for lithium ion capacitor

Patent metadata

Field	Value
Publication number	US-9672992-B2
Application number	US-201514610752-A
Country	US
Kind code	B2
Filing date	Jan 30, 2015
Priority date	Jan 30, 2015
Publication date	Jun 6, 2017
Grant date	Jun 6, 2017

Abstract

An anode in a lithium ion capacitor, including: a carbon composition comprising: a coke sourced carbon, a conductive carbon, and a binder as defined herein; and an electrically conductive substrate supporting the carbon composition, wherein the coke sourced carbon has a disorder by Raman analysis as defined herein; and a hydrogen content; a nitrogen content; an and oxygen content as defined herein. Also disclosed is a method of making the anode, a method of making the lithium ion capacitor, and methods of use thereof.

First claim

What is claimed is:

1. A lithium ion capacitor, comprising:
a cell comprising a stack of:
an anode comprising: a carbon composition comprising: a coke sourced carbon in from 85 to 95 wt %; a conductive carbon in from 1 to 8 wt %; and a binder in from 3 to 10 wt %, based on the total weight of the carbon composition; and an electrically conductive substrate that supports the carbon composition,

wherein the coke sourced carbon has a disorder (D) peak to graphitic (G) peak intensity ratio by Raman analysis of from 1.25 to 1.55; a hydrogen content of from 0.01 to 0.25 wt %; a nitrogen content of from 0.03 to 0.75 wt %; and an oxygen content of from 0.05 to 2.0 wt % by elemental analysis;
a cathode comprising a heat and KOH activated wheat flour sourced carbon, a fluoropolymer, and a conductive carbon black;
a separator between the anode and cathode; and
a lithium composite powder coated on at least a portion of the surface of the anode.

2. The lithium ion capacitor of claim 1 wherein the anode operates at a high charge-discharge rate of from 1 C to 4000 C.

3. The lithium ion capacitor of claim 1 wherein the cell has a discharge capacity of from 60 to 120 mAh/gm and a maximum energy density of from 30 to 60 Wh/l.

4. The lithium ion capacitor of claim 1 wherein:
the coke sourced carbon in from 88 to 92 wt %;
the conductive carbon in from 4 to 7 wt %; and
the binder is PVDF in from 4 to 6 wt % and has a molecular weight of from 300,000 to 1,000,000.

5. The lithium ion capacitor of claim 1 wherein the coke sourced carbon has a disorder (D) peak to graphitic (G) peak intensity ratio by Raman analysis of from 1.35 to 1.48.

6. The lithium ion capacitor of claim 1 wherein the coke sourced carbon has a hydrogen content of from 0.01 to 0.24 wt %; a nitrogen content of from 0.08 to 0.7 wt %; and an oxygen content of from 0.01 to 1.9 wt %.

7. The lithium ion capacitor of claim 1 wherein the coke sourced carbon has a low surface area of from 1 to 100 m 2 /g.

8. The lithium ion capacitor of claim 1 wherein the coke sourced carbon has a particle size from 1 to 30 microns.

9. The lithium ion capacitor of claim 1 wherein the coke sourced carbon has a particle size from 2 to 7 microns.

Assignees

• Corning Inc

Inventors

• Gadkaree Kishor Purushottam
• Kadam Rahul Suryakant

Classifications

• H01G11/44

  Raw materials therefor, e.g. resins or coal · CPC title

• H01G11/42

  Powders or particles, e.g. composition thereof · CPC title

• H01G11/06

  with one of the electrodes allowing ions to be reversibly doped thereinto, e.g. lithium ion capacitors [LIC] · CPC title

• H01G11/86

  specially adapted for electrodes (carbonisation or activation of carbon for the manufacture of electrodes H01G11/34) · CPC title

• H01G11/34

  characterised by carbonisation or activation of carbon · CPC title