Cathode for a lithium ion capacitor

Patent metadata

Field	Value
Publication number	US-9679704-B2
Application number	US-201514610868-A
Country	US
Kind code	B2
Filing date	Jan 30, 2015
Priority date	Jan 30, 2015
Publication date	Jun 13, 2017
Grant date	Jun 13, 2017

Abstract

A cathode in a lithium ion capacitor, including:
a carbon composition comprising: an activated carbon; a conductive carbon; and a binder in in amounts as defined herein; and a current collector that supports the carbon composition,

wherein the activated carbon has: a surface area of from 500 to 3000 m 2 /g; a pore volume where from 50 to 80% of the void volume is in pores less than 10 Å; a pore volume higher than 0.3 cm 3 /gm occupied by the micropores less than 10 Å; and a microporosity of greater than 60% of the total pore volume.

Also disclosed is a method of making the cathode and using the cathode in a lithium ion capacitor.

First claim

What is claimed is:

1. A method of making a cathode, comprising:
activating a non-lignocellulosic sourced carbon material at from 500 to 1000° C. for from 1 to 10 hrs, in an inert atmosphere to produce activated particles;
treating the activated particles with an acid, and then neutralizing;
heat treating the neutralized particles at from 500 to 1000° C. for from 1 to 10 hrs, in an inert atmosphere;
mixing the heat treated particles with a binder, and a solvent to form a mixture; and
applying the mixture to a conductive current collector to form the cathode.

2. The method of claim 1 wherein the non-lignocellulosic sourced carbon particles are selected from a wheat flour, corn flour, potato flour, rice flour, or a mixture thereof.

3. The method of claim 1 further comprising including a conductive carbon in an amount of from 1 to 8 wt % in the mixture prior to applying the mixture to a conductive current collector to form the cathode.

Assignees

• Corning Inc

Inventors

• Gadkaree Kishor Purushottam
• Kadam Rahul Suryakant
• Liu Jia

Classifications

• H02J7/865

  Battery or charger load switching, e.g. concurrent charging and load supply (H02J7/50 takes precedence) · CPC title

• H01G11/50

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

• H01G11/34

  characterised by carbonisation or activation of carbon · CPC title

• H01G11/38

  Carbon pastes or blends; Binders or additives therein · 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