Patents by Inventor Zhengzheng Zhang

Zhengzheng Zhang 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).

  • Method for separating nickel and cobalt from a solution
    Patent number: 11008638
    Abstract: A method for separating nickel and cobalt from a solution includes the steps of: obtaining a solution containing nickel and cobalt by acid leaching of a cathode material of a waste lithium-ion battery, adjusting the pH of the solution containing nickel and cobalt to 3.5 to 4.5, adding extractants for extraction to separate the nickel and the cobalt. The cobalt enters the organic phase, the nickel remains in the aqueous phase, and the extractants contain an acidic extractant and an alkaline extractant. The method for efficiently separating nickel and cobalt through extraction adopts a non-saponification extraction method without using NaOH as a saponifier, thereby avoiding the discharge of saponification wastewater. Under acidic conditions, the cobalt in an acidic leaching solution is effectively extracted and separated into the organic phase through synergistic action of the acidic extractant and the alkaline extractant, thereby realizing the separation of nickel from cobalt.
    Type: Grant
    Filed: December 13, 2019
    Date of Patent: May 18, 2021
    Assignee: Beijing University of Technology
    Inventors: Xiaoli Xi, Zhengzheng Zhang, Liwen Ma, Zuoren Nie
  • METHOD FOR SEPARATING NICKEL AND COBALT FROM A SOLUTION
    Publication number: 20200115773
    Abstract: A method for separating nickel and cobalt from a solution includes the steps of: obtaining a solution containing nickel and cobalt by acid leaching of a cathode material of a waste lithium-ion battery, adjusting the pH of the solution containing nickel and cobalt to 3.5 to 4.5, adding extractants for extraction to separate the nickel and the cobalt. The cobalt enters the organic phase, the nickel remains in the aqueous phase, and the extractants contain an acidic extractant and an alkaline extractant. The method for efficiently separating nickel and cobalt through extraction adopts a non-saponification extraction method without using NaOH as a saponifier, thereby avoiding the discharge of saponification wastewater. Under acidic conditions, the cobalt in an acidic leaching solution is effectively extracted and separated into the organic phase through synergistic action of the acidic extractant and the alkaline extractant, thereby realizing the separation of nickel from cobalt.
    Type: Application
    Filed: December 13, 2019
    Publication date: April 16, 2020
    Applicant: Beijing University of Technology
    Inventors: Xiaoli XI, Zhengzheng ZHANG, Liwen MA, Zuoren NIE
  • Use of zwitterionic molecules for forming a hole or electron transport layer
    Patent number: 9349958
    Abstract: The invention relates to the use of zwitterionic molecules for forming a hole or electron transport layer. The preferred zwitterionic molecules of the invention are derivatives of p-benzoquinonemonoimines. The invention is useful in the field of electronic devices in particular.
    Type: Grant
    Filed: August 23, 2011
    Date of Patent: May 24, 2016
    Assignees: CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE, UNIVERSITE DE STRASBOURG, UNIVERSITY OF NEBRASKA LINCOLN
    Inventors: Bernard Doudin, Pierre Braunstein, Lucie Routaboul, Guillaume Dalmas, Zhengzheng Zhang, Peter Dowben
  • USE OF ZWITTERIONIC MOLECULES FOR FORMING A HOLE OR ELECTRON TRANSPORT LAYER
    Publication number: 20130193426
    Abstract: The invention relates to the use of zwitterionic molecules for forming a hole or electron transport layer. The preferred zwitterionic molecules of the invention are derivatives of p-benzoquinonemonoimines. The invention is useful in the field of electronic devices in particular.
    Type: Application
    Filed: August 23, 2011
    Publication date: August 1, 2013
    Applicants: CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE, UNIVERSITY OF NEBRASKA LINCOLN, UNIVERSITE DE STRASBOURG
    Inventors: Bernard Doudin, Pierre Braunstein, Lucie Routaboul, Guillaume Dalmas, Zhengzheng Zhang, Peter Dowben