| 摘要 |
PROBLEM TO BE SOLVED: To prevent a capacitance from reducing when stored under the high temperature with a battery charged and to provide a battery with excellent storage characteristics under the high temperature by using lithium borate bonded with one kind of group selected from an alkoxy group, phenoxy group and their derivative group. SOLUTION: A solute of lithium borate bonded with an alkoxy group and phenoxy group is lithium tetraphenoxyborates or lithium tetraalkoxyborates such as lithium tetramethoxyborate and lithium tetraethoxyborate. When the solute that a part of hydrogen is substituted with fluorine is used, the solute is hardly reduced so that the reaction of the solute to a negative electrode in a charging condition is further suppressed. As the solute substituted with the fluorine, the solute in which the hydrogen of the alkoxy group or phenoxy group of lithium tetrakis (trifluoromethoxy) borate, etc., is substituted with the fluorine is named. |
