Non-aqueous electrolytic solution and lithium secondary battery
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Abstract
A non-aqueous electrolytic solution favorably employable for a lithium secondary battery employs a non-aqueous electrolytic solution which comprises a non-aqueous solvent and an electrolyte which further contains 0.001 to 0.8 weight % of a biphenyl derivative having the formula:
in which each of Y1 and Y2 represents hydroxyl, alkoxy, hydrocarbyl, hydrogen, acyloxy, alkoxycarbonyloxy, alkylsulfonyloxy, or halogen, and each of p and q is an integer of 1 to 3.
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14 Claims
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- 11. A method of operating a lithium secondary battery in a voltage range having a maximum operating voltage exceeding 4.2 V, the lithium secondary battery comprising a positive electrode, a negative electrode, and a non-aqueous electrolytic solution comprising a cyclic cargonate, a linear chain carbonate and an electrolyte which further contains 0.001 to 0.8 weight % of a biphenyl derivative selected from the group consisting of biphenyl, 4-methoxybiphenyl, 4-hydroxybiphenyl, o-terphenyl, 4-biphenylyl acetate, 4-biphenylyl methylcarbonate, and 4-methanesulfonyloxybiphenyl.
Specification