Patents by Inventor Constantin Ionel Stefan

Constantin Ionel Stefan 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).

  • Publication number: 20200274151
    Abstract: Provided herein are nanostructures for lithium ion battery electrodes and methods of fabrication. In some embodiments, a nanostructure template coated with a silicon-based coating is provided. The silicon coating may include a non-conformal, more porous silicon-rich SiEx layer and a conformal, denser SiEx layer on the non-conformal, more porous layer. In some embodiments, two different deposition processes are used: a PECVD layer to deposit the non-conformal, silicon-rich SiEx layer and a thermal CVD process to deposit the conformal layer. The silicon-rich SiEx material prevents silicon crystalline domain growth, limits macroscopic swelling, increases lithium diffusion rate and enhances significantly battery life during lithium ion battery cycle of charge and discharge.
    Type: Application
    Filed: February 21, 2020
    Publication date: August 27, 2020
    Inventors: Chentao Yu, Weijie Wang, Constantin Ionel Stefan, Jonathan Bornstein, Daniel Seo
  • Publication number: 20200274156
    Abstract: Provided herein are nanostructures for lithium ion battery electrodes and methods of fabrication. In some embodiments, a nanostructure template coated with a silicon coating is provided. The silicon coating may include a non-conformal, more porous layer and a conformal, denser layer on the non-conformal, more porous layer. In some embodiments, two different deposition processes, e.g., a PECVD layer to deposit the non-conformal layer and a thermal CVD process to deposit the conformal layer, are used. Anodes including the nanostructures have longer cycle lifetimes than anodes made using either a PECVD or thermal CVD method alone.
    Type: Application
    Filed: May 13, 2020
    Publication date: August 27, 2020
    Inventors: Weijie Wang, Zuqin Liu, Song Han, Jonathan Bornstein, Constantin Ionel Stefan
  • Patent number: 10707484
    Abstract: Provided herein are nanostructures for lithium ion battery electrodes and methods of fabrication. In some embodiments, a nanostructure template coated with a silicon coating is provided. The silicon coating may include a non-conformal, more porous layer and a conformal, denser layer on the non-conformal, more porous layer. In some embodiments, two different deposition processes, e.g., a PECVD layer to deposit the non-conformal layer and a thermal CVD process to deposit the conformal layer, are used. Anodes including the nanostructures have longer cycle lifetimes than anodes made using either a PECVD or thermal CVD method alone.
    Type: Grant
    Filed: February 2, 2018
    Date of Patent: July 7, 2020
    Assignee: Amprius, Inc.
    Inventors: Weijie Wang, Zuqin Liu, Song Han, Jonathan Bornstein, Constantin Ionel Stefan
  • Publication number: 20190181489
    Abstract: Provided are novel electrodes for use in lithium ion batteries. An electrode includes one or more intermediate layers positioned between a substrate and an electrochemically active material. Intermediate layers may be made from chromium, titanium, tantalum, tungsten, nickel, molybdenum, lithium, as well as other materials and their combinations. An intermediate layer may protect the substrate, help to redistribute catalyst during deposition of the electrochemically active material, improve adhesion between the active material and substrate, and other purposes. In certain embodiments, an active material includes one or more high capacity active materials, such as silicon, tin, and germanium. These materials tend to swell during cycling and may loose mechanical and/or electrical connection to the substrate. A flexible intermediate layer may compensate for swelling and provide a robust adhesion interface. Provided also are novel methods of fabricating electrodes containing one or more intermediate layers.
    Type: Application
    Filed: November 5, 2018
    Publication date: June 13, 2019
    Inventors: William S. Delhagen, Rainer J. Fasching, Ghyrn E. Loveness, Song Han, Eugene M. Berdichevsky, Constantin Ionel Stefan, Yi Cui, Mark C. Platshon
  • Publication number: 20190088939
    Abstract: Provided herein are nanostructures for lithium ion battery electrodes and methods of fabrication. In some embodiments, a nanostructure template coated with a silicon coating is provided. The silicon coating may include a non-conformal, more porous layer and a conformal, denser layer on the non-conformal, more porous layer. In some embodiments, two different deposition processes, e.g., a PECVD layer to deposit the non-conformal layer and a thermal CVD process to deposit the conformal layer, are used. Anodes including the nanostructures have longer cycle lifetimes than anodes made using either a PECVD or thermal CVD method alone.
    Type: Application
    Filed: February 2, 2018
    Publication date: March 21, 2019
    Inventors: Weijie Wang, Zuqin Liu, Song Han, Jonathan Bornstein, Constantin Ionel Stefan
  • Patent number: 9923201
    Abstract: Provided herein are nanostructures for lithium ion battery electrodes and methods of fabrication. In some embodiments, a nanostructure template coated with a silicon coating is provided. The silicon coating may include a non-conformal, more porous layer and a conformal, denser layer on the non-conformal, more porous layer. In some embodiments, two different deposition processes, e.g., a PECVD layer to deposit the non-conformal layer and a thermal CVD process to deposit the conformal layer, are used. Anodes including the nanostructures have longer cycle lifetimes than anodes made using either a PECVD or thermal CVD method alone.
    Type: Grant
    Filed: May 12, 2015
    Date of Patent: March 20, 2018
    Assignee: Amprius, Inc.
    Inventors: Weijie Wang, Zuqin Liu, Song Han, Jonathan Bornstein, Constantin Ionel Stefan
  • Publication number: 20150364795
    Abstract: Prelithiation solutions for lithium-based electrochemical cells are provided. The prelithiam solutions include prelithiation salts that are configured to prelithiate the negative electrode of the electrochemical cell. Lithium ions from the prelithiation lithium salt prelithiate the negative electrode when a charging current is passed between the negative and positive electrodes. In some embodiments, the prelithiation solution may function as an electrolyte for the electrochemical cell and further includes an ion conducting lithium-based salt that is stable at the cell operating voltage. Also provided are methods of prelithiation and electrochemical cells including prelithiation solutions.
    Type: Application
    Filed: June 10, 2015
    Publication date: December 17, 2015
    Inventors: Constantin Ionel Stefan, Irina Toulokhonova, Gregory Roberts
  • Publication number: 20150325852
    Abstract: Provided herein are nanostructures for lithium ion battery electrodes and methods of fabrication. In some embodiments, a nanostructure template coated with a silicon coating is provided. The silicon coating may include a non-conformal, more porous layer and a conformal, denser layer on the non-conformal, more porous layer. In some embodiments, two different deposition processes, e.g., a PECVD layer to deposit the non-conformal layer and a thermal CVD process to deposit the conformal layer, are used. Anodes including the nanostructures have longer cycle lifetimes than anodes made using either a PECVD or thermal CVD method alone.
    Type: Application
    Filed: May 12, 2015
    Publication date: November 12, 2015
    Inventors: Weijie Wang, Zuqin Liu, Song Han, Jonathan Bornstein, Constantin Ionel Stefan