Poly-vinylidene difluoride anode binder in a lithium ion capacitor

Patent metadata

Field	Value
Publication number	US-9754734-B2
Application number	US-201715427382-A
Country	US
Kind code	B2
Filing date	Feb 8, 2017
Priority date	Jan 30, 2015
Publication date	Sep 5, 2017
Grant date	Sep 5, 2017

Abstract

A lithium ion capacitor, including: an anode including: a conductive support; a first mixture coated on the conductive support including: an interclating carbon; a conductive carbon black; and a PVDF binder in amounts as defined herein, and where the PVDF binder has a weight average molecular weight of from 300,000 to 400,000; and a second mixture coated on the first mixture, the second mixture comprising micron-sized lithium metal particles having an encapsulating shell comprised of LiPF 6 , mineral oil, and a thermoplastic binder. Also disclosed is a method of making and using the lithium ion capacitor.

First claim

What is claimed is:

1. A lithium ion capacitor, comprising:
an anode comprising:
a conductive support;
a first mixture coated on the conductive support comprising:
an interclating carbon in from 85 to 95 wt %;
a conductive carbon black in from 1 to 8 wt %; and
a PVDF binder in from 3 to 10 wt %, where the wt % is based on the total weight of the first mixture, and where the PVDF binder has a weight average molecular weight of from 300,000 to 400,000; and

a second mixture coated on the first mixture, the second mixture comprising micron-sized lithium metal particles having an encapsulating shell comprised of LiPF 6 , mineral oil, and a thermoplastic binder.

2. The capacitor of claim 1 further comprising:
a separator;
a cathode electrode coupled with the separator, the cathode electrode comprising an activated carbon in from 80 to 95 wt %, a fluorinated polymer in from 3 to 12 wt %, and carbon black in from 1 to 8 wt %; and
an electrolyte comprising an inorganic lithium salt in a non-aqueous and aprotic solvent.

3. The capacitor of claim 2 wherein the activated carbon is a high surface area carbon.

Assignees

• Corning Inc

Inventors

• Gadkaree Kishor Purushottam
• Kadam Rahul Suryakant

Classifications

• H01G11/06 Primary

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

• H01G11/52

  Separators · CPC title

• H01M4/623

  fluorinated polymers · CPC title

• H01G11/38 Primary

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

• H01G11/44

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