| 摘要 |
PURPOSE:To prevent the decomposition of an electrolyte and the generation of gas when the charging voltage is increased and obtain a secondary battery with a long cycle life by containing 3-acetyl-tetrahydrofuran in the nonaqueous electrolyte. CONSTITUTION:The electron density on C atom is sharply decreased by the high electron suction property of the acetyl group in 3-Ace-THF, electrons are not deprived of from 3-Ace-THF when the potential of a positive electrode is increased in the charging process, and oxidation deposition rarely occurs. C atoms have positive charges, the electron density on adjacent O atoms is increased to stabilize them, and they have negative charges. The electron distribution on O atoms is expanded, the mutual action with alkaline metal ions such as Li is weak, an electrochemically active deposition state is obtained in the charging process, and the negative electrode charge-discharge efficiency is high. When this nonaqueous electrolyte is used for a battery with a positive electrode 3 and a negative electrode 6 made of alkaline metal or alloy, the decomposition of the electrolyte and the occurrence of gas are prevented, and the secondary battery with a long cycle life and high reliability is obtained. |
