Rachid Yazami

US Patent:

7537682, May 26, 2009

Filed:

Mar 16, 2005

Appl. No.:

11/081841

Inventors:

Anne Dailly - Pasadena CA, US
Channing Ahn - Pasadena CA, US
Rachid Yazami - Los Angeles CA, US
Brent T. Fultz - Pasadena CA, US

Assignee:

California Institute of Technology - Pasadena CA
Centre National de la Recherche Scientifique - Paris

International Classification:

C01B 31/02

US Classification:

205555, 423460, 423461

Abstract:

Methods of purifying samples are provided that are capable of removing carbonaceous and noncarbonaceous impurities from a sample containing a carbon material having a selected structure. Purification methods are provided for removing residual metal catalyst particles enclosed in multilayer carbonaceous impurities in samples generate by catalytic synthesis methods. Purification methods are provided wherein carbonaceous impurities in a sample are at least partially exfoliated, thereby facilitating subsequent removal of carbonaceous and noncarbonaceous impurities from the sample. Methods of purifying carbon nanotube-containing samples are provided wherein an intercalant is added to the sample and subsequently reacted with an exfoliation initiator to achieve exfoliation of carbonaceous impurities.

US Patent:

7563542, Jul 21, 2009

Filed:

Jun 6, 2006

Appl. No.:

11/422564

Inventors:

Rachid Yazami - Los Angeles CA, US
André Hamwi - Clermont-Ferrand, FR

Assignee:

California Institute of Technology - Pasadena CA
Centre National de la Recherche Scientifique - Paris Cedex 16

International Classification:

H01M 4/58
H01M 4/62

US Classification:

4292314, 429217, 4292318, 42923195

Abstract:

Subfluorinated graphite fluorides of formula CFwherein CFis in the range of 0. 06 to 0. 63, e. g. , 0. 10 to 0. 46, are used as electrode materials in electrochemical devices that convert chemical energy to electrical current, e. g. , batteries. The invention additionally provides methods of manufacturing electrodes with the subfluorinated graphite fluorides, as well as primary and secondary batteries containing such electrodes.

US Patent:

7595611, Sep 29, 2009

Filed:

Aug 3, 2006

Appl. No.:

11/462290

Inventors:

Yvan Reynier - Meylan, FR
Rachid Yazami - Los Angeles CA, US
Brent T. Fultz - Pasadena CA, US

Assignee:

California Institute of Technology - Pasadena CA
Cantre National de le Recherche Scientifique - Paris

International Classification:

H02J 7/04

US Classification:

320153, 320152

Abstract:

The present invention provides systems and methods for accurately characterizing thermodynamic and materials properties of electrodes and electrochemical energy storage and conversion systems. Systems and methods of the present invention are configured for simultaneously collecting a suite of measurements characterizing a plurality of interconnected electrochemical and thermodynamic parameters relating to the electrode reaction state of advancement, voltage and temperature. Enhanced sensitivity provided by the present methods and systems combined with measurement conditions that reflect thermodynamically stabilized electrode conditions allow very accurate measurement of thermodynamic parameters, including state functions such as the Gibbs free energy, enthalpy and entropy of electrode/electrochemical cell reactions, that enable prediction of important performance attributes of electrode materials and electrochemical systems, such as the energy, power density, current rate and the cycle life of an electrochemical cell.

US Patent:

7781102, Aug 24, 2010

Filed:

Apr 22, 2004

Appl. No.:

10/829598

Inventors:

Jason A. Graetz - Upton NY, US
Brent T. Fultz - Pasadena CA, US
Channing Ahn - Pasadena CA, US
Rachid Yazami - Los Angeles CA, US

Assignee:

California Institute of Technology - Pasadena CA
Centre National de la Recherche Scientifique (C.N.R.S.) - Paris

International Classification:

H01M 4/36
H01M 6/18
H01M 4/00

US Classification:

429226, 429128, 429322

Abstract:

Electrodes comprising an alkali metal, for example, lithium, alloyed with nanostructured materials of formula SiGe, where 0

US Patent:

7794880, Sep 14, 2010

Filed:

Nov 16, 2006

Appl. No.:

11/560570

Inventors:

Rachid Yazami - Los Angeles CA, US
André Hamwi - Clermont-Ferrand, FR

Assignee:

California Institute of Technology - Pasadena CA
Centre National de la Recherche Scientifique (C.N.R.S) - Paris
Universite Blaise Pascal - Clermont-Ferrand

International Classification:

H01M 4/58
H01M 4/60
H01M 4/02

US Classification:

4292317, 429209, 429212

Abstract:

The invention provides fluorinated multi-layered carbon nanomaterials and methods for their production. In one aspect of the invention, the carbon nanomaterials are partially fluorinated and retain some unreacted carbon. The invention also provides electrodes and electrochemical devices incorporating the fluorinated carbon nanomaterials of the invention. In one aspect of the invention, the electrochemical has a first electrode including the at least partially fluorinated carbon materials of the invention and a second electrode including a source of lithium ions.

US Patent:

8232007, Jul 31, 2012

Filed:

Feb 21, 2007

Appl. No.:

11/677541

Inventors:

Rachid Yazami - Los Angeles CA, US
André Hamwi - Clermont-Ferrand, FR

Assignee:

California Institute of Technology - Pasadena CA
Centre National de la Recherche Scientifique (C.N.R.S.) - Paris
Universite Blaise Pascal - Clermont-Ferrand

International Classification:

H01M 4/58
H01M 4/02
H01M 4/60
H01M 6/00

US Classification:

4292317, 429209, 429212, 296231

Abstract:

Subfluorinated carbonaceous materials obtained through direct fluorination of graphite or coke particles are provided. One set of subfluorinated carbonaceous materials has an average chemical composition CFin which 0. 63

US Patent:

8377586, Feb 19, 2013

Filed:

Mar 2, 2007

Appl. No.:

11/681493

Inventors:

Rachid Yazami - Los Angeles CA, US

Assignee:

California Institute of Technology - Pasadena CA
Centre National de la Recherche Scientifique (C.N.R.S.) - Paris

International Classification:

H01M 6/04
H01M 4/13

US Classification:

429188, 4292181, 4292317

Abstract:

The present invention provides electrochemical cells capable of good electronic performance, particularly high specific energies, useful discharge rate capabilities and good cycle life. Electrochemical cells of the present invention are versatile and include primary and secondary cells useful for a range of important applications including use in portable electronic devices. Electrochemical cells of the present invention also exhibit enhanced safety and stability relative to conventional state of the art primary lithium batteries and lithium ion secondary batteries. For example, electrochemical cells of the present invention include secondary electrochemical cells using anion charge carriers capable of accommodation by positive and negative electrodes comprising anion host materials, which entirely eliminate the need for metallic lithium or dissolved lithium ion in these systems.

US Patent:

8446127, May 21, 2013

Filed:

Aug 7, 2009

Appl. No.:

12/537712

Inventors:

Rachid Yazami - Los Angeles CA, US
Joseph McMenamin - Glendale CA, US
Yvan Reynier - Grenoble, FR
Brent T. Fultz - Pasadena CA, US

Assignee:

California Institute of Technology - Pasadena CA
Centre National de la Recherche Scientifique - Paris

International Classification:

H02J 7/04

US Classification:

320132, 320153, 320152, 320134

Abstract:

Described are systems and methods for accurately characterizing thermodynamic and materials properties of electrodes and battery systems and for characterizing the state of health of electrodes and battery systems. Measurement of physical attributes of electrodes and batteries corresponding to thermodynamically stabilized electrode conditions permit determination of thermodynamic parameters, including state functions such as the Gibbs free energy, enthalpy and entropy of electrode/electrochemical cell reactions, that enable prediction of important performance attributes of electrode materials and battery systems, such as energy, power density, current rate, cycle life and state of health. Also provided are systems and methods for charging a battery according to its state of health.