| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a lithium ion secondary battery in which various substances which are other than lithium ion and become causes for increasing a deterioration of battery characteristics are prevented from moving between a positive electrode and a negative electrode and as a result, a charge and discharge efficiency can be improved when charge and discharge are repeated and moreover even if charge and discharge are repeated, a decrease in capacity is not caused and a deterioration of rate characteristics is limited. <P>SOLUTION: The nonaqueous lithium ion secondary battery is composed of a positive electrode, a nonaqueous electrolyte solution and a porous separator membrane, and a negative electrode which is electrically insulated from the positive electrode through the porous separator membrane. Between the positive electrode and the negative electrode, there is, on the porous separator membrane, preferably at least one layer of a substantially non-porous lithium ion conductive layer having an air permeability of 10,000 sec/100 cc or more. <P>COPYRIGHT: (C)2009,JPO&INPIT |
