| 摘要 |
<P>PROBLEM TO BE SOLVED: To make high safety and high battery characteristics compatible in a nonaqueous electrolyte battery used by a charging voltage over 4.20 V. <P>SOLUTION: A separator used for the nonaqueous electrolyte secondary battery in which a positive electrode and a negative electrode are opposedly arranged via the separator, and in which an open circuit voltage in a full charged state per a pair of the positive electrode and the negative electrode is in a range of 4.25 V to 6.00 V, has a constitution that the separator has a base material layer made of a polyolefin based resin material, and a surface layer which is formed at least at a positive electrode side face of the base material layer and made of at least one kind of a group consisting of polyvinylidene fluoride, polytetrafluoro ethylene and polypropylene, and that by forming a coating layer in which at least one kind of a group consisting of all aromatic polyamide resin, polyimide and ceramics is contained in, for example, at least one of surfaces of the separator, at least one kind of the group consisting of the all aromatic polyamide resin, polyimide and ceramics exists on the outermost surface of the separator. <P>COPYRIGHT: (C)2009,JPO&INPIT |
