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Non-aqueous electrolytic solution for lithium secondary battery or lithium ion capacitor, and lithium secondary battery or lithium ion capacitor using the same

專利號(hào)
US10868336B2
公開日期
2020-12-15
申請(qǐng)人
UBE INDUSTRIES, LTD.（JP Ube）
發(fā)明人
Koji Abe; Makoto Babazono; Masahide Kondo; Hiroshi Yanagi; Kei Shimamoto
IPC分類
H01M10/0569; H01G11/60; H01M10/052; H01G11/06; H01G11/62; H01M4/36; H01M4/505; H01M4/525; H01M10/0525; H01M10/0568; H01M10/0567; H01M4/38; H01M4/58; H01M4/485; H01G11/32; H01G11/50; H01M4/587
技術(shù)領(lǐng)域
aqueous,lithium,lipf6,carbonate,1.1m,non,electrode,in,battery,or
地域： Ube-shi

摘要

The present invention provides a non-aqueous electrolytic solution for a lithium secondary battery or a lithium ion capacitor, wherein the non-aqueous electrolytic solution includes a lithium salt as dissolved in a non-aqueous solvent in a concentration of 0.8 to 1.5 M (mol/L), the non-aqueous solvent includes, in relation to the whole of the non-aqueous solvent, 5 to 25% by volume of ethylene carbonate, 5 to 25% by volume of propylene carbonate, 20 to 30% by volume of dimethyl carbonate, 20 to 40% by volume of methyl ethyl carbonate, and 10 to 20% by volume of a fluorinated chain ester; the total content of ethylene carbonate and propylene carbonate in the non-aqueous solvent is 20 to 30% by volume, the total content of dimethyl carbonate and the fluorinated chain ester in the non-aqueous solvent is 30 to 40% by volume; and the flash point of the non-aqueous electrolytic solution is 20° C. or higher, and the present invention also provides an energy storage device.

說明書

Further, Patent Document 4 discloses that in a lithium secondary battery using a non-aqueous electrolytic solution including a mixed solvent containing 20 to 35% by volume of ethylene carbonate, 35 to 45% by volume of ethyl methyl carbonate, 15 to 35% by volume of dimethyl carbonate and 3 to 15% by volume of diethyl carbonate or propylene carbonate, the cycle characteristics at room temperature and ?30° C. are improved.

In addition, Patent Document 5 discloses that the output characteristics at ?30° C. is improved in a lithium secondary battery using a non-aqueous electrolytic solution in which in a solvent prepared by mixing ethylene carbonate, dimethyl carbonate, ethyl methyl carbonate and methyl propionate in a volume ratio of 3:3:3:1, LiPF6 is dissolved so as to have a concentration of 1 M, and 2% by mass of vinylene carbonate is added.

PRIOR ART DOCUMENTS Patent Documents

Patent Document 1: Japanese Patent Publication No. 11-40195

Patent Document 2: WO 2008/102493

Patent Document 3: WO 2013/033579

Patent Document 4: Japanese Patent Publication No. 2005-353579

Patent Document 5: Japanese Patent Publication No. 2006-172775

SUMMARY OF THE INVENTION Problem to be Solved by the Invention

權(quán)利要求

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