Sekundärbatterie mit nichtwässerigen Elektrolyten und Verfahren zu ihrer Herstellung

摘要

A novel non-aqueous electrolyte secondary battery having a high voltage and a high energy density in which the charge and discharge characteristics are excellent, the cycle life is long and the reliability is high, and its production method. For a non-aqueous electrolyte secondary battery comprising at least a negative electrode, a positive electrode and a lithium ion-conductive non-aqueous electrolyte, a silicon oxide or a silicate containing lithium is used as a negative electrode active material. Especially, a silicon lower oxide containing lithium represented by a composition formula LixSiOy (wherein x>/=0, 2>y>0) is used. The potential of the negative electrode active material is low and base, the charge and discharge capacity in a base potential region of 0-1 V with respect to metallic lithium is large, and the polarization (internal resistance) during charge and discharge is small, so that a secondary battery having a high voltage and a high energy density is obtained in which charge and discharge characteristics with a large current are excellent, the deterioration due to excessive charge and excessive discharge is small, the cycle life is long and the reliability is high.