Patents by Inventor Ganesan Nagasubramanian
Ganesan Nagasubramanian 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).
-
Patent number: 11845765Abstract: A method for synthesizing a purified lithium (Li)+ anion binding agent (ABA-F)? salt and the corresponding Li+(ABA-F)? are disclosed. The method includes dissolving a boron-based acid in a polar solvent to form a solution. The solution is refluxed to form an anion binding agent. A stoichiometric amount of a small fluorinated salt, such as LiF, is added to the anion binding agent to form a mixture. The mixture is subsequently crystallized to obtain a substantially pure Li+(ABA-F)? salt. Example purified Li+(ABA-F)? salts include Ox-Li+(ABA-F), m-Li+(ABA-F), and BF3—Li+(ABA-F)?. These purified Li+(ABA-F)? salts provide the benefits of increased battery thermal safety without loss of electrochemical performance.Type: GrantFiled: October 27, 2020Date of Patent: December 19, 2023Assignee: National Technology & Engineering Solutions of Sandia, LLCInventors: Christopher Orendorff, Ganesan Nagasubramanian, Kyle R. Fenton, David Ingersoll, Harry Pratt, Chad Staiger, Travis Mark Anderson
-
Publication number: 20200395595Abstract: Cast components can improve the effectiveness of current state-of-the-art in thermal battery processing technology in terms of cost, labor, materials usage, and flexibility. Cast components can include cast cathodes, anodes, and separators.Type: ApplicationFiled: June 22, 2020Publication date: December 17, 2020Inventors: Eric Allcorn, Ganesan Nagasubramanian, Christopher A. Apblett
-
Patent number: 10862163Abstract: Organosilicon electrolytes exhibit several important properties for use in lithium carbon monofluoride batteries, including high conductivity/low viscosity and thermal/electrochemical stability. Conjugation of an anion binding agent to the siloxane backbone of an organosilicon electrolyte creates a bi-functional electrolyte. The bi-functionality of the electrolyte is due to the ability of the conjugated polyethylene oxide moieties of the siloxane backbone to solvate lithium and thus control the ionic conductivity within the electrolyte, and the anion binding agent to bind the fluoride anion and thus facilitate lithium fluoride dissolution and preserve the porous structure of the carbon monofluoride cathode. The ability to control both the electrolyte conductivity and the electrode morphology/properties simultaneously can improve lithium electrolyte operation.Type: GrantFiled: January 19, 2017Date of Patent: December 8, 2020Assignee: National Technology & Engineering Solutions of Sandia, LLCInventors: Kyle R. Fenton, Ganesan Nagasubramanian, Chad Staiger, Harry Pratt, Kevin Leung, Susan Rempe, Mangesh Chaudhari, Travis Mark Anderson
-
Patent number: 10727474Abstract: Cast components can improve the effectiveness of current state-of-the-art in thermal battery processing technology in terms of cost, labor, materials usage, and flexibility. Cast components can include cast cathodes, anodes, and separators.Type: GrantFiled: January 10, 2018Date of Patent: July 28, 2020Assignee: National Technology & Engineering Solutions of Sandia, LLCInventors: Eric Allcorn, Ganesan Nagasubramanian, Christopher A. Apblett
-
Patent number: 10586997Abstract: A redox flow battery is described herein that has a sodium-super-ionic-conductor NaSICON barrier disposed between an anolyte chamber of the battery and the catholyte chamber of the battery. The NaSICON barrier prevents crossover of solvents or active redox species between the anolyte chamber and the catholyte chamber, while permitting transport of sodium ions between the chambers. In exemplary embodiments, the anolyte chamber includes an anolyte solution that comprises a first active redox species dissolved in a first solvent, while the catholyte chamber includes a catholyte solution that comprises a second active redox species dissolved in a second solvent.Type: GrantFiled: September 20, 2017Date of Patent: March 10, 2020Assignee: National Technology & Engineering Solutions of Sandia, LLCInventors: David Ingersoll, Ganesan Nagasubramanian, Eric Allcorn
-
Publication number: 20170207485Abstract: Organosilicon electrolytes exhibit several important properties for use in lithium carbon monofluoride batteries, including high conductivity/low viscosity and thermal/electrochemical stability. Conjugation of an anion binding agent to the siloxane backbone of an organosilicon electrolyte creates a bi-functional electrolyte. The bi-functionality of the electrolyte is due to the ability of the conjugated polyethylene oxide moieties of the siloxane backbone to solvate lithium and thus control the ionic conductivity within the electrolyte, and the anion binding agent to bind the fluoride anion and thus facilitate lithium fluoride dissolution and preserve the porous structure of the carbon monofluoride cathode. The ability to control both the electrolyte conductivity and the electrode morphology/properties simultaneously can improve lithium electrolyte operation.Type: ApplicationFiled: January 19, 2017Publication date: July 20, 2017Inventors: Kyle R. Fenton, Ganesan Nagasubramanian, Chad Staiger, Harry Pratt, Kevin Leung, Susan Rempe, Mangesh Chaudhari, Travis Mark Anderson
-
Publication number: 20150030909Abstract: The present invention is directed to a higher power, thin film lithium-ion electrolyte on a metallic substrate, enabling mass-produced solid-state lithium batteries. High-temperature thermodynamic equilibrium processing enables co-firing of oxides and base metals, providing a means to integrate the crystalline, lithium-stable, fast lithium-ion conductor lanthanum lithium tantalate (La1/3-xLi3xTaO3) directly with a thin metal foil current collector appropriate for a lithium-free solid-state battery.Type: ApplicationFiled: October 10, 2014Publication date: January 29, 2015Inventors: Jon Ihlefeld, Paul G. Clem, Cynthia Edney, David Ingersoll, Ganesan Nagasubramanian, Kyle Ross Fenton
-
Patent number: 8877388Abstract: The present invention is directed to a higher power, thin film lithium-ion electrolyte on a metallic substrate, enabling mass-produced solid-state lithium batteries. High-temperature thermodynamic equilibrium processing enables co-firing of oxides and base metals, providing a means to integrate the crystalline, lithium-stable, fast lithium-ion conductor lanthanum lithium tantalate (La1/3-xLi3xTaO3) directly with a thin metal foil current collector appropriate for a lithium-free solid-state battery.Type: GrantFiled: May 23, 2012Date of Patent: November 4, 2014Assignee: Sandia CorporationInventors: Jon Ihlefeld, Paul G. Clem, Cynthia Edney, David Ingersoll, Ganesan Nagasubramanian, Kyle Ross Fenton
-
Patent number: 5989748Abstract: The power loss of lithium/lithium ion battery cells is significantly reduced, especially at low temperatures, when about 1% by weight of an additive is incorporated in the electrolyte layer of the cells. The usable additives are organic solvent soluble cyanoethylated polysaccharides and poly(vinyl alcohol). The power loss decrease results primarily from the decrease in the charge transfer resistance at the interface between the electrolyte and the cathode.Type: GrantFiled: May 8, 1998Date of Patent: November 23, 1999Assignee: The United States of America as represented by the United States Department of EnergyInventor: Ganesan Nagasubramanian
-
Patent number: 5599355Abstract: A composite solid electrolyte film is formed by dissolving a lithium salt such as lithium iodide in a mixture of a first solvent which is a cosolvent for the lithium salt and a binder polymer such as polyethylene oxide and a second solvent which is a solvent for the binder polymer and has poor solubility for the lithium salt. Reinforcing filler such as alumina particles are then added to form a suspension followed by the slow addition of binder polymer. The binder polymer does not agglomerate the alumina particles. The suspension is cast into a uniform film.Type: GrantFiled: January 19, 1994Date of Patent: February 4, 1997Inventors: Ganesan Nagasubramanian, Alan I. Attia
-
Patent number: 5360686Abstract: A composite solid electrolyte film for a lithium battery comprising a dispersion of small reinforcing particles such as alumina in a binder rein such as polyethylene oxide. The particles are coated with a compatible lithium salt such as lithium iodide and the alumina particles preferably have a size below 0.5 microns.Type: GrantFiled: August 20, 1993Date of Patent: November 1, 1994Assignee: The United States of America as represented by the National Aeronautics and Space AdministrationInventors: Emmanuel Peled, Ganesan Nagasubramanian, Gerald Halpert, Alan I. Attia
-
Patent number: 5272359Abstract: A solid-state synaptic memory matrix (10) having switchable weakly conductive connections at each node (24) whose resistances can be selectably increased or decreased over several orders of magnitude by control signals of opposite polarity, and which will remain stable after the signals are removed, comprises an insulated substrate (16), a set of electrical conductors (14) upon which is deposited a layer (18) of an organic conducting polymer, which changes from an insulator to a conductor upon the transfer of electrons, such as polymerized pyrrole doped with 7,7,8,8-tetracyanoquinodimethane (TCNQ), covered by a second set of conductors (20) laid at right angles to the first.Type: GrantFiled: December 21, 1990Date of Patent: December 21, 1993Assignee: California Institute of TechnologyInventors: Ganesan Nagasubramanian, Salvador DiStefano, Jovan Moacanin
-
Patent number: 5110694Abstract: The conductivity is increased an order of magnitude and interfacial charge transfer resistance is substantially decreased by incorporating a minor amount of 12-Crown-4 ether in a polyethylene oxide-lithium salt solid electrolyte film.Type: GrantFiled: October 11, 1990Date of Patent: May 5, 1992Assignee: The United States of America as represented by the Administrator of the National Aeronautics and Space AdministrationInventors: Ganesan Nagasubramanian, Salvador DiStefano
-
Patent number: 5066748Abstract: An electropolymerized film comprised of polymers and copolymers of a monomer having the general formula: ##STR1## is formed on the surface of an anode. The finished structures have superior electrical and mechanical properties for use in applications such as electrostatic dissipation and for the reduction of the radar cross section of advanced aircraft.Type: GrantFiled: February 7, 1990Date of Patent: November 19, 1991Assignee: The United States of America as represented by the Administrator of the National Aeronautics and Space AdministrationInventors: Ganesan Nagasubramanian, Salvador DiStefano, Ranty H. Liang
-
Patent number: 4945012Abstract: Higher energy and power densities are achieved in a secondary battery based on molten sodium and a solid, ceramic separator such as a beta alumina and a molten catholyte such as sodium tetrachloroaluminate and a copper chloride cathode. The higher cell voltage of copper chloride provides higher energy densities and the higher power densities result from increased conductivity resulting from formation of copper as discharge proceeds.Type: GrantFiled: September 11, 1989Date of Patent: July 31, 1990Assignee: The United States of America as represented by the Administrator, National Aeronautics and Space AdministrationInventors: Ratnakumar V. Bugga, Salvador Distefano, Ganesan Nagasubramanian, Clyde P. Bankston