Patents by Inventor Suresh Sriramulu
Suresh Sriramulu 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).
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Publication number: 20240079578Abstract: Provided are methods of making and using pre-lithiated cathodes for use in lithium ion secondary cells as the means of supplying extra lithium to the cell. The chemically or electrochemically pre-lithiated cathodes include cathode active material that is pre-lithiated prior to assembly into an electrochemical cell. The process of producing pre-lithiated cathodes includes contacting a cathode active material to an electrolyte, the electrolyte further contacting a counter electrode lithium source and applying an electric potential or current to the cathode active material and the lithium source thereby pre-lithiating the cathode active material with lithium.Type: ApplicationFiled: November 10, 2023Publication date: March 7, 2024Inventors: David Ofer, Jane Rempel, Suresh Sriramulu
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Patent number: 11855282Abstract: Provided are compositions, systems, and methods of making and using pre-lithiated cathodes for use in lithium ion secondary cells as the means of supplying extra lithium to the cell. The chemically or electrochemically pre-lithiated cathodes include cathode active material that is pre-lithiated prior to assembly into an electrochemical cell. The process of producing pre-lithiated cathodes includes contacting a cathode active material to an electrolyte, the electrolyte further contacting a counter electrode lithium source and applying an electric potential or current to the cathode active material and the lithium source thereby pre-lithiating the cathode active material with lithium. An electrochemical cell is also provided including the pre-lithiated cathode, an anode, a separator and an electrolyte.Type: GrantFiled: June 16, 2022Date of Patent: December 26, 2023Assignee: CAMX Power LLCInventors: David Ofer, Jane Rempel, Suresh Sriramulu
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Publication number: 20230307630Abstract: Provided are electrochemically active secondary particles that provide excellent capacity and improved cycle life. The particles are characterized by a plurality of nanocrystals with small average crystallite size. The reduced crystallite size reduces impedance generation during cycling thereby improving capacity and cycle life. Also provided are methods of forming electrochemically active materials, as well as electrodes and electrochemical cells employing the secondary particles.Type: ApplicationFiled: May 8, 2023Publication date: September 28, 2023Inventors: Suresh Sriramulu, Jane Rempel, Adrian W. Pullen, David Ofer
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Publication number: 20230197947Abstract: Provided are electrochemically active particles suitable for use as an active material in a cathode of a lithium ion electrochemical cell that include: a plurality of crystallites including a first composition comprising lithium, nickel, and oxygen; and a grain boundary between adjacent crystallites of the plurality of crystallites and comprising a second composition comprising lithium, nickel, and oxygen; wherein the grain boundary has a higher electrochemical affinity for lithium than the crystallites. The higher electrochemical affinity for Li leads to increased Li retention in the grain boundaries during or at charge relative to the bulk crystallites and stabilizes the structure of the grain boundaries and crystallites for improved cycling stability with no appreciable loss in capacity.Type: ApplicationFiled: July 13, 2022Publication date: June 22, 2023Inventors: Jane Rempel, David Ofer, Jennifer A. Nelson, Adrian W. Pullen, Kenan Sahin, Suresh Sriramulu
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Patent number: 11682762Abstract: Provided are electrochemically active secondary particles that provide excellent capacity and improved cycle life. The particles are characterized by a plurality of nanocrystals with small average crystallite size. The reduced crystallite size reduces impedance generation during cycling thereby improving capacity and cycle life. Also provided are methods of forming electrochemically active materials, as well as electrodes and electrochemical cells employing the secondary particles.Type: GrantFiled: September 22, 2021Date of Patent: June 20, 2023Assignee: CAMX Power LLCInventors: Suresh Sriramulu, Jane Rempel, Adrian W. Pullen, David Ofer
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Patent number: 11643336Abstract: Provided are processes for the production of particles for use as a precursor material for synthesis of Li-ion cathode active material of a lithium-ion cell comprising: a non-lithiated nickel oxide particle of the formula MOx wherein M comprises 80 at % Ni or greater and wherein x is 0.7 to 1.2, M optionally excluding boron in the MOx crystal structure; and a modifier oxide intermixed with, coated on, present within, or combinations thereof the non-lithiated nickel oxide particle, wherein the modifier oxide is associated with the non-lithiated nickel oxide such that a calcination at 500 degrees Celsius for 2 hours results in crystallite growth measured by XRD of 2 nanometers or less.Type: GrantFiled: March 7, 2022Date of Patent: May 9, 2023Assignee: CAMX Power LLCInventors: Adrian W. Pullen, Suresh Sriramulu
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Publication number: 20220328820Abstract: Provided are compositions, systems, and methods of making and using pre-lithiated cathodes for use in lithium ion secondary cells as the means of supplying extra lithium to the cell. The chemically or electrochemically pre-lithiated cathodes include cathode active material that is pre-lithiated prior to assembly into an electrochemical cell. The process of producing pre-lithiated cathodes includes contacting a cathode active material to an electrolyte, the electrolyte further contacting a counter electrode lithium source and applying an electric potential or current to the cathode active material and the lithium source thereby pre-lithiating the cathode active material with lithium. An electrochemical cell is also provided including the pre-lithiated cathode, an anode, a separator and an electrolyte.Type: ApplicationFiled: June 16, 2022Publication date: October 13, 2022Inventors: David Ofer, Jane Rempel, Suresh Sriramulu
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Patent number: 11424449Abstract: Provided are electrochemically active particles suitable for use as an active material in a cathode of a lithium ion electrochemical cell that include: a plurality of crystallites comprising a first composition comprising lithium, nickel, and oxygen; and a grain boundary between adjacent crystallites of the plurality of crystallites and comprising a second composition comprising lithium, nickel, and oxygen; wherein the grain boundary has a higher electrochemical affinity for lithium than the crystallites. The higher electrochemical affinity for Li leads to increased Li retention in the grain boundaries during or at charge relative to the bulk crystallites and stabilizes the structure of the grain boundaries and crystallites for improved cycling stability with no appreciable loss in capacity.Type: GrantFiled: December 27, 2019Date of Patent: August 23, 2022Assignee: CAMX Power LLCInventors: Jane Rempel, David Ofer, Jennifer A. Nelson, Adrian Pullen, Kenan Sahin, Suresh Sriramulu
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Patent number: 11394023Abstract: Provided are compositions, systems, and methods of making and using pre-lithiated cathodes for use in lithium ion secondary cells as the means of supplying extra lithium to the cell. The chemically or electrochemically pre-lithiated cathodes include cathode active material that is pre-lithiated prior to assembly into an electrochemical cell. The process of producing pre-lithiated cathodes includes contacting a cathode active material to an electrolyte, the electrolyte further contacting a counter electrode lithium source and applying an electric potential or current to the cathode active material and the lithium source thereby pre-lithiating the cathode active material with lithium. An electrochemical cell is also provided including the pre-lithiated cathode, an anode, a separator and an electrolyte.Type: GrantFiled: February 9, 2017Date of Patent: July 19, 2022Assignee: CAMX Power LLCInventors: David Ofer, Jane Rempel, Suresh Sriramulu
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Publication number: 20220185692Abstract: Provided are processes for the production of particles for use as a precursor material for synthesis of Li-ion cathode active material of a lithium-ion cell comprising: a non-lithiated nickel oxide particle of the formula MOx wherein M comprises 80 at % Ni or greater and wherein x is 0.7 to 1.2, M optionally excluding boron in the MOx crystal structure; and a modifier oxide intermixed with, coated on, present within, or combinations thereof the non-lithiated nickel oxide particle, wherein the modifier oxide is associated with the non-lithiated nickel oxide such that a calcination at 500 degrees Celsius for 2 hours results in crystallite growth measured by XRD of 2 nanometers or less.Type: ApplicationFiled: March 7, 2022Publication date: June 16, 2022Inventors: Adrian W. Pullen, Suresh Sriramulu
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Patent number: 11309544Abstract: Provided are electrochemical secondary cells that exhibit excellent abuse tolerance, deep discharge and overcharge conditions including at extreme temperatures and remain robust and possess excellent performance. Cells as provided herein include: a cathode a polycrystalline cathode electrochemically active material including the formula Li1+xMO2+y, wherein ?0.9?x?0.3, ?0.3?y?0.3, and wherein M includes Ni at 80 atomic percent or higher relative to total M, the cathode electrochemically active material comprising a non-uniform distribution of Co; an anode including an anode electrochemically active material of the formula Li4+aTi5O12+b wherein ?0.3?a?3.3, ?0.3?b?0.3; and wherein the anode and the cathode each independently include a current collector substrate comprising aluminium.Type: GrantFiled: April 12, 2019Date of Patent: April 19, 2022Assignee: CAMX Power LLCInventors: Kenan Sahin, David Ofer, Daniel Kaplan, Suresh Sriramulu
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Patent number: 11299402Abstract: Provided are particles for use as a precursor material for synthesis of Li-ion cathode active material of a lithium-ion cell comprising: a non-lithiated nickel oxide particle of the formula MOx wherein M comprises 80 at % Ni or greater and wherein x is 0.7 to 1.2, M optionally excluding boron in the MOx crystal structure; and a modifier oxide intermixed with, coated on, present within, or combinations thereof the non-lithiated nickel oxide particle, wherein the modifier oxide is associated with the non-lithiated nickel oxide such that a calcination at 500 degrees Celsius for 2 hours results in crystallite growth measured by XRD of 2 nanometers or less. Also provided are processes of forming electrochemically active particles using the precursors nickel oxides.Type: GrantFiled: October 24, 2019Date of Patent: April 12, 2022Assignee: CAMX Power LLCInventors: Adrian W. Pullen, Suresh Sriramulu
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Publication number: 20220029162Abstract: Provided are electrochemical secondary cells that exhibit excellent abuse tolerance, deep discharge and overcharge conditions including at extreme temperatures and remain robust and possess excellent performance. Cells as provided herein include: a cathode a polycrystalline cathode electrochemically active material including the formula Li1+xMO2+y, wherein ?0.9?x?0.3, ?0.3?y?0.3, and wherein M includes Ni at 80 atomic percent or higher relative to total M, an anode including an anode electrochemically active material defined by an electrochemical redox potential of 400 mV or greater vs Li/Li+.Type: ApplicationFiled: October 4, 2021Publication date: January 27, 2022Inventors: Thomas Carney, Rahul Malik, David Ofer, Kenan Sahin, Daniel Kaplan, Suresh Sriramulu
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Publication number: 20220006086Abstract: Provided are electrochemically active secondary particles that provide excellent capacity and improved cycle life. The particles are characterized by a plurality of nanocrystals with small average crystallite size. The reduced crystallite size reduces impedance generation during cycling thereby improving capacity and cycle life. Also provided are methods of forming electrochemically active materials, as well as electrodes and electrochemical cells employing the secondary particles.Type: ApplicationFiled: September 22, 2021Publication date: January 6, 2022Inventors: Suresh Sriramulu, Jane Rempel, Adrian W. Pullen, David Ofer
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Patent number: 11165065Abstract: Provided are electrochemical secondary cells that exhibit excellent abuse tolerance, deep discharge and overcharge conditions including at extreme temperatures and remain robust and possess excellent performance. Cells as provided herein include: a cathode a polycrystalline cathode electrochemically active material including the formula Li1+xMO2+y, wherein ?0.9?x?0.3, ?0.3?y?0.3, and wherein M includes Ni at 80 atomic percent or higher relative to total M, an anode including an anode electrochemically active material defined by an electrochemical redox potential of 400 mV or greater vs Li/Li+.Type: GrantFiled: April 10, 2020Date of Patent: November 2, 2021Assignee: CAMX Power LLCInventors: Thomas Carney, Rahul Malik, David Ofer, Kenan Sahin, Daniel Kaplan, Suresh Sriramulu
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Patent number: 11158853Abstract: Provided are electrochemically active secondary particles that provide excellent capacity and improved cycle life. The particles are characterized by a plurality of nanocrystals with small average crystallite size. The reduced crystallite size reduces impedance generation during cycling thereby improving capacity and cycle life. Also provided are methods of forming electrochemically active materials, as well as electrodes and electrochemical cells employing the secondary particles.Type: GrantFiled: April 27, 2017Date of Patent: October 26, 2021Assignee: CAMX Power LLCInventors: Adrian Pullen, Jane Rempel, Suresh Sriramulu, David Ofer
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Publication number: 20210122645Abstract: Provided are particles for use as a precursor material for synthesis of Li-ion cathode active material of a lithium-ion cell comprising: a non-lithiated nickel oxide particle of the formula MOx wherein M comprises 80 at % Ni or greater and wherein x is 0.7 to 1.2, M optionally excluding boron in the MOx crystal structure; and a modifier oxide intermixed with, coated on, present within, or combinations thereof the non-lithiated nickel oxide particle, wherein the modifier oxide is associated with the non-lithiated nickel oxide such that a calcination at 500 degrees Celsius for 2 hours results in crystallite growth measured by XRD of 2 nanometers or less. Also provided are processes of forming electrochemically active particles using the precursors nickel oxides.Type: ApplicationFiled: October 24, 2019Publication date: April 29, 2021Inventors: Adrian W. Pullen, Suresh Sriramulu
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Patent number: 10950857Abstract: Provided are electrochemical cells that include as a cathode active material within the cathode of the cell secondary particles that provide excellent capacity and improved cycle life. The particles are characterized by grain boundaries between adjacent crystallites of the plurality of crystallites and comprising a second composition having a layered ?-NaFeO2-type structure, a cubic structure, a spinel structure, or a combination thereof, wherein the electrochemically active cathode active material has an initial discharge capacity of 180 mAh/g or greater; and wherein the electrochemical cell has an impedance growth at 4.2V less than 50% for greater than 100 cycles at 45° C.Type: GrantFiled: January 17, 2019Date of Patent: March 16, 2021Assignee: CAMX Power LLCInventors: Adrian W. Pullen, David Ofer, Suresh Sriramulu, Kenan Sahin, Jane Rempel
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Patent number: 10843936Abstract: Provided are electrochemically active secondary particles that provide excellent capacity and improved cycle life. The particles are characterized by selectively enriched grain boundaries where the grain boundaries are enriched with Al and Co. The enrichment with Al reduces impedance generation during cycling thereby improving capacity and cycle life. Also provided are methods of forming electrochemically active materials, as well as electrodes and electrochemical cells employing the secondary particles.Type: GrantFiled: May 19, 2020Date of Patent: November 24, 2020Assignee: CAMX Power LLCInventors: Adrian W. Pullen, David Ofer, Suresh Sriramulu, Kenan Sahin, Jane Rempel
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Publication number: 20200328419Abstract: Provided are electrochemical secondary cells that exhibit excellent abuse tolerance, deep discharge and overcharge conditions including at extreme temperatures and remain robust and possess excellent performance. Cells as provided herein include: a cathode a polycrystalline cathode electrochemically active material including the formula Li1+xMO2+y, wherein ?0.9?x?0.3, ?0.3?y?0.3, and wherein M includes Ni at 80 atomic percent or higher relative to total M, an anode including an anode electrochemically active material defined by an electrochemical redox potential of 400 mV or greater vs Li/Li+.Type: ApplicationFiled: April 10, 2020Publication date: October 15, 2020Inventors: Thomas Carney, Rahul Malik, David Ofer, Kenan Sahin, Daniel Kaplan, Suresh Sriramulu