US009853326B2 (12 ) United States Patent ( 10 ) Patent No. : US 9 ,853 , 326 B2 Tokuda et al. ( 45 ) Date of Patent: Dec. 26 , 2017 ( 54 ) NONAQUEOUS ELECTROLYTE FOR (58 ) Field of Classification Search SECONDARY BATTERY AND CPC .. .. HO1M 10 /0569 ; HOTM 10 /0567 ; HOLM NONAQUEOUS - ELECTROLYTE 10 /0525 ; HOTM 4 /587 ; HOTM 4 / 134 ; SECONDARY BATTERY EMPLOYING THE HO1M 2300 /0025 ; YO2E 60 / 122 SAME See application file for complete search history . References Cited ( 71 ) Applicant: MITSUBISHI CHEMICAL (56 ) CORPORATION , Chiyoda- ku ( JP ) U . S . PATENT DOCUMENTS 5 ,580 ,684 A 12 / 1996 Yokoyama et al . (72 ) Inventors : Hiroyuki Tokuda, Ibaraki ( JP ) ; 5 , 754 , 393 A 5 / 1998 Hiratsuka et al. Minoru Kotato , Ibaraki ( JP ) ; Masahiro 6 ,001 , 325 A 12 / 1999 Salmon et al. Takehara , Ibaraki ( JP ) ; Shinichi 6 ,033 , 808 A 3 / 2000 Salmon et al. 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HOIM 4 / 134 ( 2010 .01 ) HOIM 4 /587 ( 2010 .01 ) (57 ) ABSTRACT HOIM 10 / 0525 ( 2010 . 01 ) An object is to provide a nonaqueous electrolyte and a HOIM 10 / 0569 ( 2010 .01 ) nonaqueous - electrolyte secondary battery which have excel HOIM 10 /052 ( 2010 .01 ) lent discharge load characteristics and are excellent in high HOIM 10 /056 (2010 . 01) temperature storability , cycle characteristics , high capacity , (52 ) U . S . CI. continuous - charge characteristics , storability, gas evolution CPC . .. .. HOIM 10 /0567 ( 2013 .01 ) ; HOIM 4 / 133 inhibition during continuous charge , high -current - density ( 2013 .01 ) ; HOTM 4 / 134 ( 2013. 01 ) ; HOIM charge / discharge characteristics , discharge load characteris 4 / 587 ( 2013 . 01 ) ; HOIM 10 /052 ( 2013 .01 ) ; tics , etc. The object has been accomplished with a nonaque HOIM 10 / 056 ( 2013 . 01 ) ; HOIM 10 /0525 ous electrolyte which comprises: a monofluorophosphate ( 2013 .01 ) ; HOIM 10 /0569 ( 2013 . 01 ) ; HOIM and / or a difluorophosphate ; and further a compound having 2300 /004 (2013 . 01 ) ; HOIM 2300 / 0025 a specific chemical structure or specific properties . ( 2013. 01 ) ; YO2E 60 /122 ( 2013 .01 ) 5 Claims, No Drawings US 9 ,853 , 326 B2 Page 2 ( 56 ) References Cited KR 10 - 2006 - 0035767 A 4 / 2006 KR 10 - 2006 -0075966 A 7 / 2006 U . S . PATENT DOCUMENTS KR 10 - 2007 -0031807 A 3 / 2007 WO WO 99 / 18625 A2 4 / 1999 2006 / 0134527 A16 / 2006 Amine et al . 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