| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a separator for a battery having high oxidation resistance, and a lithium ion secondary battery having high oxidation resistance, and suppressing deterioration of the battery capacity even after storage in a high temperature and a charged state for a long time. <P>SOLUTION: The separator 13 for the battery includes a porous film 12 which is a substrate and a crosslinked polymer layer 11. The crosslinked polymer layer 11 contains a crosslinked polymer obtained by reacting a reactive polymer having a functional group in a molecule with a polyfunctional compound having reactivity to the functional group and crosslinking at least a part of the reactive polymer, and inorganic particles, and is non-porous. The inorganic particles are unevenly distributed in the surface layer part of the crosslinked polymer layer 11. The lithium ion secondary battery includes a positive electrode 14, a negative electrode 15, a separator 13 for the battery arranged between the positive electrode 14 and the negative electrode 15, and a nonaqueous electrolyte. The separator 13 for the battery is arranged so that a porous film 12 locates on the negative electrode 15 side and the crosslinked polymer layer 11 is located on the positive electrode 14 side. <P>COPYRIGHT: (C)2010,JPO&INPIT |
