Method of pre-doping a lithium ion capacitor

Patent metadata

Field	Value
Publication number	US-9928969-B2
Application number	US-201715684050-A
Country	US
Kind code	B2
Filing date	Aug 23, 2017
Priority date	Nov 9, 2012
Publication date	Mar 27, 2018
Grant date	Mar 27, 2018

Abstract

A method for pre-doping a lithium ion capacitor, including:
compressing a lithium ion capacitor of the formula:

C/S/A/S/C/S/A/S/C,
where:
/A/ is an anode coated on both sides with an anode carbon layer, and each anode carbon layer is further coated with lithium composite powder (LCP) layer; C/ is a cathode coated on one side with a layer of an cathode carbon mixture; and S is a separator; and a non-aqueous electrolyte; and
conditioning the resulting compressed lithium ion capacitor, for example, at a rate of from C/20 to 4C, and the conditioning redistributes the impregnated lithium as lithium ions in the anode carbon structure. Also disclosed is an carbon coated anode having lithium composite powder (LCP) layer compressed on the carbon coated anode.

First claim

What is claimed is:

1. An anode in a lithium ion capacitor, comprising:
an electrically conductive substrate;
a carbon composition comprising:
a high temperature carbon processed at from 1000 to 1700° C.;
a conductive carbon; and
a conductive binder; and

a lithium composite powder (LCP),

wherein the electrically conductive substrate supports at least a portion of the carbon composition, the carbon composition supports at least a portion of the lithium composite powder, and the lithium composite powder is impregnated or embedded in the surface of at least a portion of the carbon composition.

2. The anode of claim 1 wherein the lithium composite powder impregnated or embedded in the surface of at least a portion of the carbon composition is a source of lithium ions.

3. The anode of claim 1 wherein:
the electrically conductive substrate is a metallic foil or a graphite;
the high temperature carbon is present in from 85 to 95 wt %;
the conductive carbon is a carbon black in from 1 to 8 wt %; and
the conductive binder is a polyvinylidene difluoride in from 1 to 10 wt %; and
the lithium composite powder (LCP) is present in from 0.25 to 0.3 wt %, based on the total weight of the carbon composition, the LCP comprising:
a core comprising a lithium metal; and
a shell on the core comprising a lithium salt, a shell binder, and an oil.

Assignees

• Corning Inc

Inventors

• Gadkaree Kishor Purushottam
• Kadam Rahul Suryakant

Classifications

• H01G11/14

  Arrangements or processes for adjusting or protecting hybrid or EDL capacitors (emergency protective circuit arrangements specially adapted for capacitors, and effecting automatic switching in the event of an undesired change from normal working conditions H02H7/16; emergency protective circuit arrangements for limiting excess current or voltages without disconnection H02H9/00) · CPC title

• H01G11/86

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

• H01G11/38

  Carbon pastes or blends; Binders or additives therein · CPC title

• H01G11/84

  Processes for the manufacture of hybrid or EDL capacitors, or components thereof · CPC title

• H01G11/50 Primary

  specially adapted for lithium-ion capacitors, e.g. for lithium-doping or for intercalation · CPC title