| abstract |
The opening portion in which the positive electrode, the negative electrode, and the non-aqueous electrolyte external member are housed is temporarily sealed to obtain a temporarily sealed battery, and the temporarily sealed battery is charged for the first time so that the potential of the negative electrode is higher than 0.8 V and 1.4 V or less ( After storing in an environment of 50 ° C or more and less than 80 ° C with respect to Li/Li+), the internal gas is discharged and formally sealed, and a nonaqueous electrolyte secondary battery is manufactured. As the titanium composite oxide, lithium titanate having a spinel structure, lithium titanate having a stellite structure, Li4+xTi5O12, Li2+xTi3O7, a titanic acid compound represented by the general formula H2TinO2n+1, a bronze-type titanium oxide, or the like can be used. Monoclinic titanium composite oxide. |