COLD MELTING SALT, AND LITHIUM SECONDARY CELL USING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a cold melting salt having excellent reduction stability and excellent property as electrolyte for a secondary cell, and to provide a lithium secondary cell with high safety and reliability using the cold melting salt as electrolytic solution.

SOLUTION: The cold melting salt is composed of at least one kind of cation selected from among the group formed of N-methyl-N-ethylpyrrolidinium, N- methyl-N-propylprrolidinium, N-methyl-N-ethylpiperidinium, and N-methyl-N- propylpiperidinium; and at least one kind of anion chosen from N(CF3SO2)2-, CF3SO3-, N(C2F5SO2)2-, BF4-, and PF6-. The lithium secondary cell uses the above cold molten salt as the solvent of the electrolyte.

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