Pankaj Arora

US Patent:

7112389, Sep 26, 2006

Filed:

Sep 30, 2005

Appl. No.:

11/240749

Inventors:

Pankaj Arora - Chesterfield VA, US
Simon Frisk - Richmond VA, US
Lu Zhang - Midlothian VA, US

Assignee:

E. I. du Pont de Nemours and Company - Wilmington DE

International Classification:

H01M 4/26
H01G 9/00

US Classification:

429128, 429120, 429142, 429176, 429248, 429249, 361502, 361504, 361508, 361512

Abstract:

Alkaline and lithium batteries are disclosed that advantageously include separators comprising at least one porous layer of fine fibers having a diameter of between about 50 nm and about 3000 nm that provide improved combinations of reduced thickness, dendritic barrier against short-circuiting and low ionic resistance as compared with known battery separators.

US Patent:

7170739, Jan 30, 2007

Filed:

Sep 30, 2005

Appl. No.:

11/240738

Inventors:

Pankaj Arora - Chesterfield VA, US
Simon Frisk - Richmond VA, US
Lu Zhang - Midlothian VA, US

Assignee:

E.I. du Pont de Nemours and Company - Wilmington DE

International Classification:

H01G 9/00

US Classification:

361502, 361504, 361508, 361512, 361523, 361528, 429247, 429249

Abstract:

Electrochemical double layer capacitors are disclosed that advantageously include separators having at least one porous layer of nanofibers having average diameters of between about 50 nm and about 1000 nm that provide improved combinations of reduced thickness, barrier against the development of soft short-circuits and low ionic resistance as compared with known capacitor separators.

US Patent:

7760486, Jul 20, 2010

Filed:

Aug 28, 2007

Appl. No.:

11/895912

Inventors:

Pankaj Arora - Chesterfield VA, US
Simon Frisk - Richmond VA, US

Assignee:

E. I. du Pont de Nemours and Company - Wilmington DE

International Classification:

H01G 9/02

US Classification:

361512

Abstract:

The present invention provides an aluminum electrolytic capacitor having a cathode, an anode and an improved spacer comprised of polymeric nanofibers. The nanofiber spacer offers low ionic resistance, desirable barrier properties and high electrolyte absorption. The use of the improved spacer results in devices having higher capacitance, lower ESR, less heat generation and improved capacitor manufacturing efficiency.

US Patent:

8557444, Oct 15, 2013

Filed:

Oct 7, 2010

Appl. No.:

12/899801

Inventors:

Pankaj Arora - Chesterfield VA, US
Stephane Francois Bazzana - Wilmington DE, US
T. Joseph Dennes - Parkesburg PA, US
Eric P. Holowka - Philadelphia PA, US
Lakshmi Krishnamurthy - Wilmington DE, US
Stephen Mazur - Wilmington DE, US
Glen E. Simmonds - Avondale PA, US

Assignee:

E I du Pont de Nemours and Company - Wilmington DE

International Classification:

H01M 2/16
H01M 4/131
H01M 4/583
H01M 4/64

US Classification:

429249, 4292313, 4292318, 429233

Abstract:

This invention provides a multi-layer article comprising a first electrode material, a second electrode material, and a porous separator disposed between and in contact with the first and the second electrode materials, wherein the porous separator comprises a nanoweb consisting essentially of a plurality of nanofibers of a fully aromatic polyimide. Also provided is a method for preparing the multi-layer article, and an electrochemical cell employing the same. A multi-layer article comprising a polyimide nanoweb with enhanced properties is also provided.

US Patent:

20080070463, Mar 20, 2008

Filed:

Sep 20, 2006

Appl. No.:

11/523827

Inventors:

Pankaj Arora - Chesterfield VA, US
Guanghui Chen - Glen Allen VA, US
Simon Frisk - Richmond VA, US
David Keith Graham - Richmond VA, US
Robert Anthony Marin - Midlothian VA, US

International Classification:

D04H 13/00
D04H 5/00

US Classification:

442327, 442334

Abstract:

A nonwoven web of fibers that have a number average diameter of less than 1 micron. The web can have a Poisson Ratio of less than about 0.8, a solidity of at least about 20%, a basis weight of at least about 1 gsm, and a thickness of at least 1 micrometer.

US Patent:

20090178206, Jul 16, 2009

Filed:

Nov 7, 2008

Appl. No.:

12/266756

Inventors:

Pankaj Arora - Chesterfield VA, US
Joseph Brian Hovanec - Richmond VA, US
Junaid Ahmed Siddiqui - Richmond VA, US
Simon Frisk - Newark DE, US

International Classification:

C08J 7/12
D06P 1/673

US Classification:

811564, 811554, 811565, 811556, 811568

Abstract:

The invention is an improved process for stripping chemically bonded spinning solvent from a solution-spun nonwoven web by adding antioxidant to the fiber-forming polymer, and transporting the nonwoven web through a solvent stripping zone at a temperature and for a time sufficient to reduce the solvent concentration of the fibers to less than about 1000 ppmw.

US Patent:

20090261035, Oct 22, 2009

Filed:

Jul 1, 2009

Appl. No.:

12/496242

Inventors:

PANKAJ ARORA - Chesterfield VA, US
Guanghui Chen - Glen Allen VA, US
Simon Frisk - Newark DE, US
Robert Anthony Marin - Midlothian VA, US
Hageun Suh - Chadds Ford PA, US

Assignee:

E. I. DU PONT DE NEMOURS AND COMPANY - Wilmington DE

International Classification:

H01M 2/16
D04H 13/00
B29C 55/18
B29C 55/00
D03D 9/00
B01D 39/02

US Classification:

2105101, 428219, 442327, 264280, 264284, 2642884, 2642893, 442 1, 429247, 977755

Abstract:

A nonwoven web of fibers that have a number average diameter of less than 1 micron. The web can have a Poisson Ratio of less than about 0.8, a solidity of at least about 20%, a basis weight of at least about 1 gsm, and a thickness of at least 1 micrometer.

US Patent:

20110139331, Jun 16, 2011

Filed:

Oct 7, 2010

Appl. No.:

12/899847

Inventors:

Pankaj Arora - Chesterfield VA, US
Stephane Francois Bazzana - Wilmington DE, US
T. Joseph Dennes - Parkesburg PA, US
Eric P. Holowka - Philadelphia PA, US
Lakshmi Krishnamurthy - Wilmington DE, US
Stephen Mazur - Wilmington DE, US
Glen E. Simmonds - Avondale PA, US

Assignee:

E. I. DU PONT DE NEMOURS AND COMPANY - Wilmington DE

International Classification:

H01M 4/04
B32B 37/00
B82Y 40/00

US Classification:

156 622, 264109, 977842

Abstract:

The invention provides a method for enhancing the properties of polyimide nanowebs, the method comprising subjecting a nanoweb consisting essentially of a plurality of nanofibers of an aromatic polyimide to a temperature at least 50 C. higher than the imidization temperature thereof for a period of time in the range of 5 seconds to 20 minutes, thereby preparing an enhanced nanoweb. Also provided is a multi-layer article comprising the enhanced nanoweb, and an electrochemical cell comprising the multi-layer article.