Showa Denko Materials Co., Ltd.

Hitachi Chemical Company, Ltd.

Ryuichiro Fukuta

Kumpei Yamada

Kaoru Konno

Katsunori Kojima

One aspect of the present invention provides an electrolytic solution comprising a compound represented by the following formula (1), wherein a content of the compound is 10% by mass or less based on the total amount of the electrolytic solution, wherein Rto Reach independently represent an alkyl group or a fluorine atom, Rrepresents an alkylene group, and Rrepresents an organic group containing a nitrogen atom.

Electrolytic solution and electrochemical device

One aspect of the present invention provides an electrolytic solution comprising a compound represented by the following formula (1): wherein Rto Reach independently represent an alkyl group or a fluorine atom, Rrepresents an alkylene group, and Rrepresents an organic group containing a sulfur atom.

The present invention provides, as one aspect, an electrolytic solution comprising a compound represented by the following formula (1) and a compound represented by the following formula (2): wherein Rto Reach independently represent an alkyl group or a fluorine atom, Rrepresents an alkylene group, and Rrepresents an organic group comprising a sulfur atom and not comprising a nitrogen atom; and wherein Rto Reach independently represent an alkyl group or a fluorine atom, Rrepresents an alkylene group, and Rrepresents an organic group comprising a nitrogen atom and not comprising a sulfur atom.

A lithium-ion battery system includes: a lithium-ion battery including a cathode and an anode, the cathode containing a lithium manganese-nickel complex oxide as a cathode active material, and the anode containing a lithium-titanium complex oxide as an anode active material; and a charge regulation means which regulates an end-of-charge voltage Vf within a range of 3.6 V&#x2264;Vf&#x2264;4.0 V.

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Tokyo, Japan

Ryuichiro Fukuta