Positive electrode for non-aqueous electrolyte battery, negative electrode for non-aqueous electrolyte battery, separator for non-aqueous electrolyte battery, and non-aqueous electrolyte battery using them

A non-aqueous electrolyte battery comprising:

• an electrode assembly comprising a positive electrode having a positive electrode active material layer, a negative electrode having a negative electrode active material layer, and a separator interposed between the electrodes;
• a non-aqueous electrolyte that is supplied to the electrode assembly;
• and a battery case for accommodating the electrode assembly and the non-aqueous electrolyte, wherein the separator has two directional properties, one of which being MD and the other one being TD having a less non-aqueous electrolyte permeability than that in the MD, and the non-aqueous electrolyte is supplied to the electrode assembly primarily along the TD, the non-aqueous electrolyte battery characterized in that:
• a porous layer is disposed between the separator and the positive electrode, the porous layer having a non-aqueous electrolyte permeability higher than at least that in the TD;
• an excess electrolyte is contained in at least a portion of the battery case internal space that is other than the electrode assembly;
• and the excess electrolyte and at least a portion of the porous layer are in contact with each other, and
• the positive electrode is charged to 4.40 V or higher versus the potential of a lithium reference electrode.