Patents by Inventor Rajendra P. Singh

Rajendra P. Singh 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: 10926190
    Abstract: Methods of removing target impurities from a crude lithium bis(fluorosulfonyl)imide (LiFSI) to make a purified LiFSI product. In some embodiments, a purification method includes contacting crude LiFSI with a first anhydrous organic solvent to create a solution containing LiFSI and the target impurity(ies), wherein the LiFSI is soluble and the impurity(ies) is/are substantially insoluble. In some embodiments, a second anhydrous organic solvent is added to the solution to precipitate the target impurity(ies), which is then filtered to obtain a filtrate. In some embodiments, solvent is removed from the filtrate to obtain a solid mass containing LiFSI, which may then be contacted with a third anhydrous organic solvent in which the LiFSI is insoluble. The LiFSI may then be isolated from the third anhydrous organic solvent to obtain the purified LiFSI product. Also disclosed are purified LiFSI products and electrochemical devices utilizing purified LiFSI products, among other things.
    Type: Grant
    Filed: September 13, 2019
    Date of Patent: February 23, 2021
    Assignee: SES Holdings Pte. Ltd.
    Inventors: Rajendra P. Singh, Qichao Hu
  • Patent number: 10840553
    Abstract: Free-solvent-free lithium sulfonimide salt compositions that are liquid at room temperature, and methods of making free-solvent-free liquid lithium sulfonimide salt compositions. In an embodiment, the methods include mixing one or more lithium sulfonimide salts with one or more ether-based solvents and then removing the free solvent(s) under suitable vacuum, temperature, and time conditions so as to obtain a free-solvent-free liquid lithium sulfonimide salt composition that is liquid at room temperature. In an embodiment, the only solvent molecules that remain in the liquid lithium sulfonimide salt composition are adducted with lithium sulfonimide salt molecules. An example automated processing system for making free-solvent-free liquid lithium sulfonimide salts is also disclosed.
    Type: Grant
    Filed: August 2, 2019
    Date of Patent: November 17, 2020
    Assignee: SES Holdings Pte. Ltd.
    Inventors: Rajendra P. Singh, Shubha Nageswaran, Qichao Hu
  • Publication number: 20200280098
    Abstract: Free-solvent-free lithium sulfonimide salt compositions that are liquid at room temperature, and methods of making free-solvent-free liquid lithium sulfonimide salt compositions. In an embodiment, the methods include mixing one or more lithium sulfonimide salts with one or more ether-based solvents and then removing the free solvent(s) under suitable vacuum, temperature, and time conditions so as to obtain a free-solvent-free liquid lithium sulfonimide salt composition that is liquid at room temperature. In an embodiment, the only solvent molecules that remain in the liquid lithium sulfonimide salt composition are adducted with lithium sulfonimide salt molecules. An example automated processing system for making free-solvent-free liquid lithium sulfonimide salts is also disclosed.
    Type: Application
    Filed: August 2, 2019
    Publication date: September 3, 2020
    Inventors: Rajendra P. Singh, Shubha Nageswaran, Qichao Hu
  • Patent number: 10756390
    Abstract: The present invention provides a single-phase or homogeneous solution comprising a high concentration of a salt, in particular a lithium salt, in an organic solvent. Such a high salt content in organic solvent is useful in a variety of applications including, but not limited to, in electrical energy storage devices as well as other devices that can benefit from a low-volatility liquid electrolyte.
    Type: Grant
    Filed: November 17, 2015
    Date of Patent: August 25, 2020
    Assignee: SES Holdings Pte. Ltd.
    Inventors: Rajendra P. Singh, Jerry Lynn Martin
  • Patent number: 10734664
    Abstract: A method of removing one or more target impurities from crude hydrogen bis(fluorosulfonyl)imide (HFSI) using a crystallization technique. In some embodiments, the method includes contacting the crude HFSI with at least one anhydrous solvent to create a solution. The solution is caused to have a temperature sufficient to cause HFSI in the solution to crystalize while the one or more impurities remain dissolved in the mother liquor of the solution. The crystalized HFSI and the mother liquor containing the one or more impurities are separated to obtained a purified HFSI product. Purified HFSI products are also disclosed, as are systems, such as secondary batteries, incorporating purified HFSI products.
    Type: Grant
    Filed: September 13, 2019
    Date of Patent: August 4, 2020
    Assignee: SES Holdings Pte. Ltd.
    Inventors: Rajendra P. Singh, Qichao Hu
  • Publication number: 20200155964
    Abstract: Methods for making high-purity LiFSI salts and intermediate products using one, the other, or both of a reactive-solvent removal/replacement method and an LiFSI purification method. In some embodiments, the reactive-solvent removal/replacement method includes using non-reactive anhydrous organic solvents to remove and/or replace one or more reactive solvents in a crude LiFSI. In some embodiments, the LiFSI purification method includes using anhydrous organic solvents to remove impurities, such as synthesis impurities, from a crude LiFSI. In some embodiments, crude LiFSI can be made using an aqueous-based neutralization process. LiFSI salts and products made using methods of the disclosure are also described, as are uses of such salts and products and electrochemical devices that include such salts and products.
    Type: Application
    Filed: November 15, 2019
    Publication date: May 21, 2020
    Inventors: Rajendra P. Singh, Qichao Hu
  • Publication number: 20200155963
    Abstract: Methods of removing target impurities from a crude lithium bis(fluorosulfonyl)imide (LiFSI) to make a purified LiFSI product. In some embodiments, a purification method includes contacting crude LiFSI with a first anhydrous organic solvent to create a solution containing LiFSI and the target impurity(ies), wherein the LiFSI is soluble and the impurity(ies) is/are substantially insoluble. In some embodiments, a second anhydrous organic solvent is added to the solution to precipitate the target impurity(ies), which is then filtered to obtain a filtrate. In some embodiments, solvent is removed from the filtrate to obtain a solid mass containing LiFSI, which may then be contacted with a third anhydrous organic solvent in which the LiFSI is insoluble. The LiFSI may then be isolated from the third anhydrous organic solvent to obtain the purified LiFSI product. Also disclosed are purified LiFSI products and electrochemical devices utilizing purified LiFSI products, among other things.
    Type: Application
    Filed: September 13, 2019
    Publication date: May 21, 2020
    Inventors: Rajendra P. Singh, Qichao Hu
  • Patent number: 10566659
    Abstract: Binary and ternary eutectic mixtures and corresponding electrolytes are disclosed. In some embodiments, binary eutectic mixtures and electrolytes each include a first salt, X1+Y1?, and a second salt, X2+Y2?, wherein each of X1+ and X2+ is an alkali metal cation and X1+ is different from X2+; and each of Y1? and Y2? is a sulfonimide anion and Y1? is different from Y2?. In ternary eutectic mixtures and electrolytes further include a third salt, X3+Y3?, wherein X3+ is different from each of X1+ and X2+. In some embodiments, the eutectic mixtures and electrolytes have melting points in a range of about 5° C. to about 70° C. Electrochemical devices containing such eutectic-mixture electrolytes are also disclosed.
    Type: Grant
    Filed: August 2, 2019
    Date of Patent: February 18, 2020
    Assignee: SES Holdings Pte. Ltd.
    Inventors: Rajendra P. Singh, Shubha Nageswaran, Qichao Hu
  • Patent number: 9643907
    Abstract: The present invention provides methods and processes for producing ?-fluoroalkyl ketones from non-fluoro ?-haloalkyl ketones using a fluorohydrogenate compound. In some embodiments, the fluorohydrogenate compound is an ionic liquid. One particular method of the invention utilizes a fluorohydrogenate ionic liquid compound of the formula: Q+[F.(HF)n], wherein Q30 is an onium cation and n is a number from 0 to 3.
    Type: Grant
    Filed: June 19, 2015
    Date of Patent: May 9, 2017
    Assignee: COORSTEK FLUOROCHEMICALS, INC.
    Inventors: Rajendra P. Singh, Jerry Lynn Martin
  • Publication number: 20160289169
    Abstract: The present invention provides N-substituted glycinium bis(fluorosulfonyl)imide compounds and methods for producing and using the same. In particular, the N-substituted glycinium bis(fluorosulfonyl)imide compound is of the formula: wherein each of R1, R2 and R3 is independently selected from the group consisting of alkyl, aryl, aralkyl, cycloalkyl, (cycloalkyl)alkyl, heteroaryl, (heteroaryl)alkyl, heterocyclyl, and (heterocyclyl)alkyl; or R1 and R2 together with the nitrogen atom to which they are attached to form a nitrogen-heterocyclyl, or a nitrogen-heteroaryl.
    Type: Application
    Filed: March 29, 2016
    Publication date: October 6, 2016
    Applicant: CoorsTek Fluorochemicals, Inc.
    Inventors: Rajendra P. Singh, Jerry Lynn Martin
  • Publication number: 20160289170
    Abstract: The present invention provides an N-substituted glycinium (fluorosulfonyl)(trifluoromethylsulfonyl)imide compounds and methods for producing and using the same. In particular, the N-substituted glycinium (fluorosulfonyl)(trifluoromethylsulfonyl)imide compound is of the formula: wherein each of R1, R2 and R3 is independently selected from the group consisting of alkyl, aryl, aralkyl, cycloalkyl, (cycloalkyl)alkyl, heteroaryl, (heteroaryl)alkyl, heterocyclyl, and (heterocyclyl)alkyl; or R1 and R2 together with the nitrogen atom to which they are attached to form a nitrogen-heterocyclyl, or a nitrogen-heteroaryl.
    Type: Application
    Filed: March 29, 2016
    Publication date: October 6, 2016
    Applicant: CoorsTek Fluorochemicals, Inc.
    Inventors: Rajendra P. Singh, Jerry Lynn Martin
  • Publication number: 20160149262
    Abstract: The present invention provides a single-phase or homogeneous solution comprising a high concentration of a salt, in particular a lithium salt, in an organic solvent. Such a high salt content in organic solvent is useful in a variety of applications including, but not limited to, in electrical energy storage devices as well as other devices that can benefit from a low-volatility liquid electrolyte.
    Type: Application
    Filed: November 17, 2015
    Publication date: May 26, 2016
    Applicant: CoorsTek Fluorochemicals, Inc.
    Inventors: Rajendra P. Singh, Jerry Lynn Martin
  • Patent number: 9284268
    Abstract: The invention provides a method for producing fluorotrifluoromethylsulfonyl imide (FTFSI) by reacting non-fluorohalogenated trihalomethylsulfonyl imide (XTXSI) with hydrogen fluoride, where each X is independently a nonfluoro-halide, such as Cl, Br, or I.
    Type: Grant
    Filed: November 4, 2013
    Date of Patent: March 15, 2016
    Assignee: CoorsTek Fluorochemicals, Inc.
    Inventors: Joseph Carl Poshusta, Jerry Lynn Martin, Rajendra P. Singh
  • Patent number: 9272995
    Abstract: The present invention provides a method for producing ionic liquids without the use of a volatile solvent and/or water. In some embodiments, methods of the invention allow a continuous process for producing ionic liquids.
    Type: Grant
    Filed: February 19, 2013
    Date of Patent: March 1, 2016
    Assignee: CoorsTek Fluorochemicals, Inc.
    Inventors: Rajendra P. Singh, Jerry Lynn Martin, Joseph Carl Poshusta
  • Publication number: 20160002135
    Abstract: The present invention provides methods and processes for producing ?-fluoroalkyl ketones from non-fluoro ?-haloalkyl ketones using a fluorohydrogenate compound. In some embodiments, the fluorohydrogenate compound is an ionic liquid. One particular method of the invention utilizes a fluorohydrogenate ionic liquid compound of the formula: Q+[F•(HF)n], wherein Q is an onium cation and n is a number from 0 to 3.
    Type: Application
    Filed: June 19, 2015
    Publication date: January 7, 2016
    Inventors: Rajendra P. Singh, Jerry Lynn Martin
  • Patent number: 9156758
    Abstract: The present invention provides a process for producing a compound comprising a perfluorinated alkyl group moiety from a carbonyl compound. Typically, the process includes contacting a carbonyl compound with a silane compound in the presence of a fluorohydrogenate ionic liquid under conditions sufficient to produce a compound comprising a perfluorinated alkyl group. The silane compound includes a perfluoroalkyl group.
    Type: Grant
    Filed: December 20, 2013
    Date of Patent: October 13, 2015
    Assignee: CoorsTek Fluorochemicals, Inc.
    Inventor: Rajendra P. Singh
  • Publication number: 20150218068
    Abstract: The present invention provides a process for producing a compound comprising a perfluorinated alkyl group moiety from a carbonyl compound. Typically, the process includes contacting a carbonyl compound with a silane compound in the presence of a fluorohydrogenate ionic liquid under conditions sufficient to produce a compound comprising a perfluorinated alkyl group. The silane compound includes a perfluoroalkyl group.
    Type: Application
    Filed: December 20, 2013
    Publication date: August 6, 2015
    Applicant: BOULDER IONICS CORPORATION
    Inventor: Rajendra P. Singh
  • Patent number: 9090546
    Abstract: The present invention provides methods and processes for producing ?-fluoroalkyl ketones from non-fluoro ?-haloalkyl ketones using a fluorohydrogenate compound. In some embodiments, the fluorohydrogenate compound is an ionic liquid. One particular method of the invention utilizes a fluorohydrogenate ionic liquid compound of the formula: Q+[F.(HF)n], wherein Q+ is an onium cation and n is a number from 0 to 3.
    Type: Grant
    Filed: July 3, 2014
    Date of Patent: July 28, 2015
    Assignee: CoorsTek FluoroChemicals, Inc.
    Inventors: Rajendra P. Singh, Jerry Lynn Martin
  • Publication number: 20150126778
    Abstract: The invention provides a method for producing fluorotrifluoromethylsulfonyl imide (FTFSI) by reacting non-fluorohalogenated trihalomethylsulfonyl imide (XTXSI) with hydrogen fluoride, where each X is independently a nonfluoro-halide, such as Cl, Br, or I.
    Type: Application
    Filed: November 4, 2013
    Publication date: May 7, 2015
    Applicant: Boulder Ionics Corporation
    Inventors: Joseph Carl Poshusta, Jerry Lynn Martin, Rajendra P. Singh
  • Publication number: 20140235873
    Abstract: The present invention provides a method for producing ionic liquids without the use of a volatile solvent and/or water. In some embodiments, methods of the invention allow a continuous process for producing ionic liquids.
    Type: Application
    Filed: February 19, 2013
    Publication date: August 21, 2014
    Applicant: BOULDER IONICS
    Inventors: Rajendra P. Singh, Jerry Lynn Martin, Joseph Carl Poshusta