US011011781B2 ( 12 ) United States Patent ( 10 ) Patent No .: US 11,011,781 B2 Yamada et al . ( 45 ) Date of Patent : May 18 , 2021 ( 54 ) NONAQUEOUS ELECTROLYTE ( 51 ) Int . Ci . SECONDARY BATTERY HOIM 10/0568 ( 2010.01 ) HOIM 10/0569 ( 2010.01 ) ( 71 ) Applicants : THE UNIVERSITY OF TOKYO , (Continued ) Tokyo ( JP ) ; KABUSHIKI KAISHA ( 52 ) U.S. CI . TOYOTA JIDOSHOKKI, Kariya ( JP ) CPC HOIM 10/0568 ( 2013.01 ) ; HOIM 4/587 ( 2013.01 ) ; HOIM 10/0525 ( 2013.01 ) ; ( 72 ) Inventors : Atsuo Yamada , Tokyo ( JP ) ; Yuki (Continued ) Yamada , Tokyo ( JP ) ; Yoshihiro ( 58 ) Field of Classification Search Nakagaki , Kariya ( JP ) ; Tomoyuki CPC HO1M 10/0568 ; HO1M 10/0525 ; HOLM Kawai, Kariya ( JP ) ; Yuki Hasegawa , 10/0569 ; HO1M 4/587 Kariya ( JP ) ; Kohei Mase , Kariya ( JP ) ; See application file for complete search history . 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Date : Apr. 2 , 2015 ( 74 ) Attorney, Agent, or Firm — Sughrue Mion , PLLC ( 65 ) Prior Publication Data ( 57 ) ABSTRACT US 2016/0226100 A1 Aug. 4 , 2016 An electrolytic solution of a nonaqueous electrolyte second ary battery contains a metal salt , and an organic solvent ( 30 ) Foreign Application Priority Data having a heteroatom and satisfies Is > Io , when an intensity of an original peak of the solvent is represented as lo and an Sep. 25 , 2013 ( JP ) JP2013-198282 intensity of a peak resulting from shifting of the original Sep. 25 , 2013 ( JP ) JP2013-198283 peak is represented as Is . 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