Patents by Inventor Prakash Palepu

Prakash Palepu has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Stabilized lithium metal powder for li-ion application, composition and process
    Publication number: 20070006680
    Abstract: A method of stabilizing lithium metal powder is provided. The method includes the steps of heating lithium metal to a temperature above its melting point, agitating the molten lithium metal, and contacting the lithium metal with a fluorination agent to provide a stabilized lithium metal powder.
    Type: Application
    Filed: July 3, 2006
    Publication date: January 11, 2007
    Inventors: B. Dover, Christopher Woltermann, Marina Yakovleva, Yuan Gao, Prakash Palepu
  • Positive electrode active materials for secondary batteries and methods of preparing same
    Patent number: 6878490
    Abstract: The present invention is a positive electrode active material that can be used in secondary lithium and lithium-ion batteries to provide the power capability, i.e., the ability to deliver or retake energy in short periods of time, desired for large power applications such as power tools, electric bikes and hybrid electric vehicles. The positive electrode active material of the invention includes at least one electron conducting compound of the formula LiM1x?y{A}yOz and at least one electron insulating and lithium ion conducting lithium metal oxide, wherein M1 is a transition metal, {A} is represented by the formula ?wiBi wherein Bi is an element other than M1 used to replace the transition metal M1 and wi is the fractional amount of element Bi in the total dopant combination such that ?wi=1; Bi is a cation in LiM1x?y{A}yOz; 0.95?x?2.10; 0?y?x/2; and 1.90?z?4.20.
    Type: Grant
    Filed: October 29, 2001
    Date of Patent: April 12, 2005
    Assignee: FMC Corporation
    Inventors: Yuan Gao, Marina Yakovleva, Michael E. Leonowicz, Prakash Palepu, John F. Engel
  • Positive electrode active materials for secondary batteries and methods of preparing same
    Publication number: 20030035999
    Abstract: The present invention is a positive electrode active material that can be used in secondary lithium and lithium-ion batteries to provide the power capability, i.e., the ability to deliver or retake energy in short periods of time, desired for large power applications such as power tools, electric bikes and hybrid electric vehicles. The positive electrode active material of the invention includes at least one electron conducting compound of the formula LiM1x-y{A}yOz and at least one electron insulating and lithium ion conducting lithium metal oxide, wherein M1 is a transition metal, {A} is represented by the formula &Sgr;wiBi wherein Bi is an element other than M1 used to replace the transition metal M1 and wi is the fractional amount of element Bi in the total dopant combination such that &Sgr;wi=1; Bi is a cation in LiM1x-y{A}yOz; 0.95≦x≦2.10; 0≦y≦x/2; and 1.90≦z≦4.20.
    Type: Application
    Filed: October 29, 2001
    Publication date: February 20, 2003
    Applicant: FMC Corporation
    Inventors: Yuan Gao, Marina Yakovleva, Michael E. Leonowicz, Prakash Palepu, John F. Engel