| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a lithium ion secondary battery achieving low internal resistance, ensuring the reaction area of an active material, and preventing the active material from peeling off. <P>SOLUTION: The lithium ion secondary battery comprises a positive electrode, a negative electrode, and a separator intervening therebetween, the positive electrode contains a positive electrode collector plate and a positive electrode mixture, the positive electrode mixture contains a positive electrode active material, a conductive assistant, and a binder, the positive electrode active material is composed of secondary particles 20 formed by agglomerating primary particles 21, and the secondary particles 20 comprise pores among the primary particles 21 and are impregnated with the conductive assistant 22 and the binder in the pores. <P>COPYRIGHT: (C)2012,JPO&INPIT |
