National Institute of Advanced Industrial Science and Technology

Tokuyama Corporation

Takeo Kawahara

Hajime Matsumoto

Tomonori Matsunaga

There are provided a novel onium salt and a method for optimizing the interface of a negative electrode by the use of the novel onium salt and/or a conventional onium salt. Such a method is characterized in that an electrolyte comprising novel 2,2,2-trifluoro-N-(trifluoromethanesulfonyl)acetamide&#x2022;tetraethyl ammonium salt is made to intervene between a negative electrode and a positive electrode in an electrochemical device having the constitution: a negative electrode|an electrolyte|a positive electrode, thereby constructing an electrode structure in the electrochemical device, and applying a voltage between the negative electrode and the positive electrode so as for the negative electrode to have a potential of &#x2212;1 V to &#x2212;5 V in terms of the potential relative to a reference electrode of I/I, thereby forming a passive-state layer comprising a decomposition product of the above electrolyte or salt on the surface of the above negative electrode.

Onium salt, electrolyte for nonaqueous cell containing the novel onium salt for nonaqueous cell and method for optimizing negative electrode using electrolyte containing onium salt

There are provided a novel onium salt and a method for optimizing the interface of a negative electrode by the use of the novel onium salt and/or a conventional onium salt. Such a method is characterized in that an electrolyte comprising novel 2,2,2-trifluoro-N-(trifluoromethanesulfonyl)acetamide.tetraethyl ammonium salt is made to intervene between a negative electrode and a positive electrode in an electrochemical device having the constitution: a negative electrode| an electrolyte| a positive electrode, thereby constructing an electrode structure in the electrochemical device, and applying a voltage between the negative electrode and the positive electrode so as for the negative electrode to have a potential of &#x2212;1 V to &#x2212;5 V in terms of the potential relative to a reference electrode of I/I, thereby forming a passive-state layer comprising a decomposition product of the above electrolyte or salt on the surface of the above negative electrode.

Onium salt, electrolyte for non-aqueous cell containing the novel onium salt for nonaqueous cell, and method for optimizing negative electrode using elecrolyte containing onium salt

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Funabashi, Japan

Takeo Kawahara