Anode for lithium ion capacitor

Patent metadata

Field	Value
Publication number	US-9552930-B2
Application number	US-201514610782-A
Country	US
Kind code	B2
Filing date	Jan 30, 2015
Priority date	Jan 30, 2015
Publication date	Jan 24, 2017
Grant date	Jan 24, 2017

Abstract

An anode in a lithium ion capacitor, including:
a carbon composition comprising: a coconut shell sourced carbon in from 85 to 95 wt %; a conductive carbon in from 1 to 10 wt %; and a binder in from 3 to 8 wt %; and an electrically conductive substrate,

wherein the coconut shell sourced carbon has a disorder (D) peak to graphitic (G) peak intensity ratio by Raman analysis of from 1.40 to 1.85; and by elemental analysis a hydrogen content of from 0.01 to 0.25 wt %; a nitrogen content of from 0.01 to 0.55 wt %; and an oxygen content of from 0.01 to 2 wt %.

Also disclosed are methods of making and using the carbon composition.

First claim

What is claimed is:

1. An anode in a lithium ion capacitor, comprising:
a carbon composition comprising: a coconut shell sourced carbon in from 85 to 95 wt %; a conductive carbon in from 1 to 10 wt %; and a binder in from 3 to 8 wt %; and
an electrically conductive substrate,

wherein the coconut shell sourced carbon composition has a disorder peak to graphitic peak intensity ratio by Raman analysis of from 1.40 to 1.85; a hydrogen content of from 0.01 to 0.25 wt %; a nitrogen content of from 0.03 to 0.55 wt %; and an oxygen content of from 0.01 to 2 wt % by elemental analysis.

2. The anode of claim 1 wherein:
the coconut shell 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.

3. The anode of claim 1 wherein the coconut shell sourced carbon composition has a disorder peak to graphitic peak intensity ratio by Raman analysis of from 1.48 to 1.8.

4. The anode of claim 1 wherein the coconut shell sourced carbon has a hydrogen content of from 0.01 to 0.24 wt %; a nitrogen content of from 0.04 to 0.5 wt %; an and oxygen content of from 0.01 to 1.9 wt %.

5. The anode of claim 1 wherein the coconut shell sourced carbon has a low surface area of from 1 to 100 m 2 /g.

6. The anode of claim 1 wherein the coconut shell sourced carbon has a particle size from 1 to 30 microns.

7. The anode of claim 1 wherein the coconut shell sourced carbon has a particle size from 2 to 7 microns.

8. The anode of claim 1 further comprising lithium composite powder coated on at least a portion of the anode.

9. A lithium ion capacitor, comprising:
the anode of claim 1 .

10. The lithium ion capacitor of claim 9 wherein the anode operates at a high charge-discharge rate of from 1 C to 4000 C.

11. The lithium ion capacitor of claim 9 further comprising:
a cell comprising a stack of:
the anode having a lithium composite powder on at least a portion of the anode;
a separator; and
a cathode comprising an a heat and KOH activated wheat flour sourced carbon, a fluoropolymer, and a conductive carbon black.

12. The lithium ion capacitor of claim 9 wherein the cell has a discharge capacity of from 60 to 120 mAh/gm and a maximum energy density of from 20 to 60 Wh/l.

Assignees

• Corning Inc

Inventors

• Gadkaree Kishor Purushottam
• Kadam Rahul Suryakant
• Husted Andrew Fleitz

Classifications

• Y02E60/13

  Energy storage using capacitors · CPC title

• C01B32/05

  Preparation or purification of carbon not covered by groups C01B32/15, C01B32/20, C01B32/25, C01B32/30 · CPC title

• H01G11/34

  characterised by carbonisation or activation of carbon · CPC title

• H01G11/06 Primary

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

• H01G11/44

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