| abstract |
The present invention provides a new and improved secondary battery separator layer capable of improving the cycle life of a secondary battery, and a secondary battery using the secondary battery separator layer. In order to solve the above-described problems, according to one aspect of the present invention, a base material disposed between a positive electrode and a negative electrode and having a plurality of first pores, and at least the base material and the negative electrode And a porous layer in which second pores having characteristics different from those of the first pores are formed, and the first pores and the second pores are impregnated, and at least some of the hydrogen atoms are impregnated. An electrolyte solution containing a fluorinated ether substituted with fluorine is provided. [Selection] Figure 1 |