Patents by Inventor Sujeet Kumar

Sujeet Kumar 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).

  • BATTERY CELL ENGINEERING AND DESIGN TO REACH HIGH ENERGY
    Publication number: 20130295439
    Abstract: Improved high energy capacity designs for lithium ion batteries are described that take advantage of the properties of high specific capacity anode active compositions and high specific capacity cathode active compositions. In particular, specific electrode designs provide for achieving very high energy densities. Furthermore, the complex behavior of the active materials is used advantageously in a radical electrode balancing design that significantly reduced wasted electrode capacity in either electrode when cycling under realistic conditions of moderate to high discharge rates and/or over a reduced depth of discharge.
    Type: Application
    Filed: May 4, 2012
    Publication date: November 7, 2013
    Inventors: Charan Masarapu, Haixia Deng, Yongbong Han, Yogesh Kumar Anguchamy, Subramanian Venkatachalam, Sujeet Kumar, Herman A. Lopez
  • Methods for synthesizing submicron doped silicon particles
    Patent number: 8568684
    Abstract: Methods are described that have the capability of producing submicron/nanoscale particles, in some embodiments dispersible, at high production rates. In some embodiments, the methods result in the production of particles with an average diameter less than about 75 nanometers that are produced at a rate of at least about 35 grams per hour. In other embodiments, the particles are highly uniform. These methods can be used to form particle collections and/or powder coatings. Powder coatings and corresponding methods are described based on the deposition of highly uniform submicron/nanoscale particles.
    Type: Grant
    Filed: January 13, 2010
    Date of Patent: October 29, 2013
    Assignee: NanoGram Corporation
    Inventors: Xiangxin Bi, Nobuyuki Kambe, James T. Gardner, Ronald J. Mosso, Shivkumar Chiruvolu, Sujeet Kumar, William E. McGovern
  • Metal oxide coated positive electrode materials for lithium-based batteries
    Patent number: 8535832
    Abstract: Positive electrode active materials are formed with various metal oxide coatings. Excellent results have been obtained with the coatings on lithium rich metal oxide active materials. Surprisingly improved results are obtained with metal oxide coatings with lower amounts of coating material. High specific capacity results are obtained even at higher discharge rates.
    Type: Grant
    Filed: August 27, 2010
    Date of Patent: September 17, 2013
    Assignee: Envia Systems, Inc.
    Inventors: Deepak Kumaar Kandasamy Karthikeyan, Subramanian Venkatachalam, Herman A. Lopez, Sujeet Kumar
  • Polymer-inorganic particle composites
    Patent number: 8515232
    Abstract: Inorganic particle/polymer composites are described that involve chemical bonding between the elements of the composite. In some embodiments, the composite composition includes a polymer having side groups chemically bonded to inorganic particles. Furthermore, the composite composition can include chemically bonded inorganic particles and ordered copolymers. Various electrical, optical and electro-optical devices can be formed from the composites.
    Type: Grant
    Filed: August 24, 2010
    Date of Patent: August 20, 2013
    Assignee: NanoGram Corporation
    Inventors: Nobuyuki Kambe, Yigal Do Blum, Benjamin Chaloner-Gill, Shivkumar Chiruvol, Sujeet Kumar, David Brent MacQueen
  • DISPERSIONS OF SILICON NANOPARTICLES
    Publication number: 20130190438
    Abstract: Inorganic particle/polymer composites are described that involve chemical bonding between the elements of the composite. In some embodiments, the composite composition includes a polymer having side groups chemically bonded to inorganic particles. Furthermore, the composite composition can include chemically bonded inorganic particles and ordered copolymers. Various electrical, optical and electro-optical devices can be formed from the composites.
    Type: Application
    Filed: September 14, 2012
    Publication date: July 25, 2013
    Inventors: Nobuyuki Kambe, Yigal Do Blum, Benjamin Chaloner-Gill, Shivkumar Chiruvol, Sujeet Kumar, David Brent MacQueen
  • POROUS SILICON BASED ANODE MATERIAL FORMED USING METAL REDUCTION
    Publication number: 20130189575
    Abstract: A porous silicon based material comprising porous crystalline elemental silicon formed by reducing silicon dioxide with a reducing metal in a heating process followed by acid etching is used to construct negative electrode used in lithium ion batteries. Gradual temperature heating ramp(s) with optional temperature steps can be used to perform the heating process. The porous silicon formed has a high surface area from about 10 m2/g to about 200 m2/g and is substantially free of carbon. The negative electrode formed can have a discharge specific capacity of at least 1800 mAh/g at rate of C/3 discharged from 1.5V to 0.005V against lithium with in some embodiments loading levels ranging from about 1.4 mg/cm2 to about 3.5 mg/cm2. In some embodiments, the porous silicon can be coated with a carbon coating or blended with carbon nanofibers or other conductive carbon material.
    Type: Application
    Filed: January 19, 2012
    Publication date: July 25, 2013
    Inventors: Yogesh Kumar Anguchamy, Charan Masarapu, Haixia Deng, Yongbong Han, Subramanian Venkatachalam, Sujeet Kumar, Herman A. Lopez
  • Surface Treatment Method to Develope a Durable Wear Resistant Overcoat for Magnetic Recording Systems
    Publication number: 20130163117
    Abstract: A durable wear-resistant coating consists of an atomically mixed layer on the surface of the head or media which is developed by bombardment of the surface with energetic C ions with optimized parameters. This mixed layer is covered with a hard DLC overcoat. This mixed interlayer is able to strongly bond the overcoat to the head or media substrate and improve the tribological properties of the overcoat. In this method a very thin layer of a carbide former material can be used as an interlayer before bombarding the surface with C ions which provides a composite interlayer containing C and species from interlayer and substrate. This composite interlayer strongly bonds the DLC overact to the ceramic substrate of the head or the metallic substrate of the media. This interlayer by itself is protective enough to protect the head media of the hard drives against wear and corrosion.
    Type: Application
    Filed: September 7, 2011
    Publication date: June 27, 2013
    Applicant: NATIONAL UNIVERSITY OF SINGAPORE
    Inventors: Charanjit Signh Bhatia, Ehsan Rismani-Yazdi, Sujeet Kumar Sinha
  • Positive electrode materials for high discharge capacity lithium ion batteries
    Patent number: 8465873
    Abstract: Positive electrode active materials are described that have a high tap density and high specific discharge capacity upon cycling at room temperature and at a moderate discharge rate. Some materials of interest have the formula Li1+xNi?Mn?Co?O2, where x ranges from about 0.05 to about 0.25, ? ranges from about 0.1 to about 0.4, ? ranges from about 0.4 to about 0.65, and ? ranges from about 0.05 to about 0.3. The materials can be coated with a metal fluoride to improve the performance of the materials especially upon cycling. Also, the coated materials can exhibit a very significant decrease in the irreversible capacity lose upon the first charge and discharge of the battery.
    Type: Grant
    Filed: December 11, 2008
    Date of Patent: June 18, 2013
    Assignee: Envia Systems, Inc.
    Inventors: Herman Lopez, Subramanian Venkatachalam, Sujeet Kumar, Deepak Kumaar Karthikeyan
  • METHOD OF APPLYING A LUBRICANT TO A MICROMECHANICAL DEVICE
    Publication number: 20130071629
    Abstract: According to an embodiment of the present invention, a method of applying a lubricant to a micromechanical device is provided. The method includes: positioning a dispensing portion of a lubricant liquid dispenser over a surface portion of a micromechanical device; and controlling the dispenser such that a single lubricant liquid droplet of a predefined volume is forced out of the dispensing portion and impinges onto the surface portion.
    Type: Application
    Filed: March 17, 2011
    Publication date: March 21, 2013
    Applicant: National University of Singapore
    Inventors: Sujeet Kumar Sinha, Jonathan Yonghui Leong, Satyanarayana Nalam, Hongbin Yu, Harikumar Vijayan, Guangya Zhou
  • Layer-layer lithium rich complex metal oxides with high specific capacity and excellent cycling
    Patent number: 8394534
    Abstract: Lithium rich and manganese rich lithium metal oxides are described that provide for excellent performance in lithium-based batteries. The specific compositions can be engineered within a specified range of compositions to provide desired performance characteristics. Selected compositions can provide high values of specific capacity with a reasonably high average voltage. Compositions of particular interest can be represented by the formula, xLi2MnO3.(1?x)LiNiu+?Mnu??CowAyO2. The compositions undergo significant first cycle irreversible changes, but the compositions cycle stably after the first cycle.
    Type: Grant
    Filed: August 27, 2010
    Date of Patent: March 12, 2013
    Assignee: Envia Systems, Inc.
    Inventors: Herman A. Lopez, Subramanian Venkatachalam, Deepak Kumaar Kandasamy Karthikeyan, Sujeet Kumar
  • Positive electrode materials for lithium ion batteries having a high specific discharge capacity and processes for the synthesis of these materials
    Patent number: 8389160
    Abstract: Positive electrode active materials are described that have a very high specific discharge capacity upon cycling at room temperature and at a moderate discharge rate. Some materials of interest have the formula Li1+xNi?Mn?CO?O2, where x ranges from about 0.05 to about 0.25, ? ranges from about 0.1 to about 0.4, ? ranges from about 0.4 to about 0.65, and ? ranges from about 0.05 to about 0.3. The materials can be coated with a metal fluoride to improve the performance of the materials especially upon cycling. Also, the coated materials can exhibit a very significant decrease in the irreversible capacity lose upon the first charge and discharge of the cell. Methods for producing these materials include, for example, a co-precipitation approach involving metal hydroxides and sol-gel approaches.
    Type: Grant
    Filed: October 7, 2008
    Date of Patent: March 5, 2013
    Assignee: Envia Systems, Inc.
    Inventors: Subramanian Venkatachalam, Herman Lopez, Sujeet Kumar
  • DISPERSIONS OF SILICON NANOPARTICLES
    Publication number: 20130012636
    Abstract: Inorganic particle/polymer composites are described that involve chemical bonding between the elements of the composite. In some embodiments, the composite composition includes a polymer having side groups chemically bonded to inorganic particles. Furthermore, the composite composition can include chemically bonded inorganic particles and ordered copolymers. Various electrical, optical and electro-optical devices can be formed from the composites.
    Type: Application
    Filed: September 14, 2012
    Publication date: January 10, 2013
    Inventors: Nobuyuki Kambe, Yigal Do Blum, Benjamin Chaloner-Gill, Shivkumar Chiruvol, Sujeet Kumar, David Brent MacQueen
  • HIGH ENERGY LITHIUM ION BATTERIES WITH PARTICULAR NEGATIVE ELECTRODE COMPOSITIONS
    Publication number: 20130004847
    Abstract: Combinations of materials are described in which high energy density active materials for negative electrodes of lithium ion batteries. In general, metal alloy/intermetallic compositions can provide the high energy density. These materials can have moderate volume changes upon cycling in a lithium ion battery. The volume changes can be accommodated with less degradation upon cycling through the combination with highly porous electrically conductive materials, such as highly porous carbon and/or foamed current collectors. Whether or not combined with a highly porous electrically conductive material, metal alloy/intermetallic compositions with an average particle size of no more than a micron can be advantageously used in the negative electrodes to improve cycling properties.
    Type: Application
    Filed: September 12, 2012
    Publication date: January 3, 2013
    Inventors: Sujeet Kumar, James P. Buckley
  • SILICON OXIDE BASED HIGH CAPACITY ANODE MATERIALS FOR LITHIUM ION BATTERIES
    Publication number: 20120295155
    Abstract: Silicon oxide based materials, including composites with various electrical conductive compositions, are formulated into desirable anodes. The anodes can be effectively combined into lithium ion batteries with high capacity cathode materials. In some formulations, supplemental lithium can be used to stabilize cycling as well as to reduce effects of first cycle irreversible capacity loss. Batteries are described with surprisingly good cycling properties with good specific capacities with respect to both cathode active weights and anode active weights.
    Type: Application
    Filed: May 16, 2011
    Publication date: November 22, 2012
    Inventors: Haixia Deng, Yongbong Han, Charan Masarapu, Yogesh Kumar Anguchamy, Herman A. Lopez, Sujeet Kumar
  • HIGH ENERGY LITHIUM ION SECONDARY BATTERIES
    Publication number: 20120263987
    Abstract: Lithium ion secondary batteries are described that have high total energy, energy density and specific discharge capacity upon cycling at room temperature and at a moderate discharge rate. The improved batteries are based on high loading of positive electrode materials with high energy capacity. This capability is accomplished through the development of positive electrode active materials with very high specific energy capacity that can be loaded at high density into electrodes without sacrificing performance. The high loading of the positive electrode materials in the batteries are facilitated through using a polymer binder that has an average molecular weight higher than 800,000 atomic mass unit.
    Type: Application
    Filed: May 24, 2012
    Publication date: October 18, 2012
    Inventors: James P. Buckley, Sujeet Kumar
  • High energy lithium ion batteries with particular negative electrode compositions
    Patent number: 8277974
    Abstract: Combinations of materials are described in which high energy density active materials for negative electrodes of lithium ion batteries. In general, metal alloy/intermetallic compositions can provide the high energy density. These materials can have moderate volume changes upon cycling in a lithium ion battery. The volume changes can be accommodated with less degradation upon cycling through the combination with highly porous electrically conductive materials, such as highly porous carbon and/or foamed current collectors. Whether or not combined with a highly porous electrically conductive material, metal alloy/intermetallic compositions with an average particle size of no more than a micron can be advantageously used in the negative electrodes to improve cycling properties.
    Type: Grant
    Filed: April 24, 2009
    Date of Patent: October 2, 2012
    Assignee: Envia Systems, Inc.
    Inventors: Sujeet Kumar, James P. Buckley
  • METHODS FOR SYNTHESIZING SUBMICRON DOPED SILICON PARTICLES
    Publication number: 20120244060
    Abstract: Methods are described that have the capability of producing submicron/nanoscale particles, in some embodiments dispersible, at high production rates. In some embodiments, the methods result in the production of particles with an average diameter less than about 75 nanometers that are produced at a rate of at least about 35 grams per hour. In other embodiments, the particles are highly uniform. These methods can be used to form particle collections and/or powder coatings. Powder coatings and corresponding methods are described based on the deposition of highly uniform submicron/nanoscale particles.
    Type: Application
    Filed: January 13, 2010
    Publication date: September 27, 2012
    Inventors: Xiangxin Bi, Nobuyuki Kambe, Craig R. Horne, James T. Gardner, Ronald J. Mosso, Shivkumar Chiruvolu, Sujeet Kumar, William E. McGovern, Pierre J. DeMascarel, Robert B. Lynch
  • High energy lithium ion secondary batteries
    Patent number: 8187752
    Abstract: Lithium ion secondary batteries are described that have high total energy, energy density and specific discharge capacity upon cycling at room temperature and at a moderate discharge rate. The improved batteries are based on high loading of positive electrode materials with high energy capacity. This capability is accomplished through the development of positive electrode active materials with very high specific energy capacity that can be loaded at high density into electrodes without sacrificing performance. The high loading of the positive electrode materials in the batteries are facilitated through using a polymer binder that has an average molecular weight higher than 800,000 atomic mass unit.
    Type: Grant
    Filed: March 13, 2009
    Date of Patent: May 29, 2012
    Assignee: Envia Systems, Inc.
    Inventors: James P. Buckley, Sujeet Kumar
  • Lithium Ion Batteries with Supplemental Lithium
    Publication number: 20120107680
    Abstract: Supplemental lithium can be used to stabilize lithium ion batteries with lithium rich metal oxides as the positive electrode active material. Dramatic improvements in the specific capacity at long cycling have been obtained. The supplemental lithium can be provided with the negative electrode, or alternatively as a sacrificial material that is subsequently driven into the negative electrode active material. The supplemental lithium can be provided to the negative electrode active material prior to assembly of the battery using electrochemical deposition. The positive electrode active materials can comprise a layered-layered structure comprising manganese as well as nickel and/or cobalt.
    Type: Application
    Filed: November 2, 2010
    Publication date: May 3, 2012
    Inventors: Shabab Amiruddin, Subramanian Venkatachalam, Bing Li, Herman A. Lopez, Sujeet Kumar
  • LITHIUM ION BATTERIES WITH SUPPLEMENTAL LITHIUM
    Publication number: 20120105007
    Abstract: Supplemental lithium can be used to stabilize lithium ion batteries with lithium rich metal oxides as the positive electrode active material. Dramatic improvements in the specific capacity at long cycling have been obtained. The supplemental lithium can be provided with the negative electrode, or alternatively as a sacrificial material that is subsequently driven into the negative electrode active material. The supplemental lithium can be provided to the negative electrode active material prior to assembly of the battery using electrochemical deposition. The positive electrode active materials can comprise a layered-layered structure comprising manganese as well as nickel and/or cobalt.
    Type: Application
    Filed: November 29, 2011
    Publication date: May 3, 2012
    Inventors: Shabab Amiruddin, Subramanian Venkatachalam, Bing Li, Herman A. Lopez, Sujeet Kumar