As is apparent from Table 1, in the secondary batteries according to Examples 1 to 4 and 6 to 10 using the separator having a concentration of the polymeric material contained in the solid electrolyte layer of 5 mass % or more, the charge-and-discharge efficiency in the charge-and-discharge cycle was more excellent than the charge-and-discharge efficiency of the secondary battery according to Example 5 using the separator having a concentration of the polymeric material contained in the solid electrolyte layer of less than 5 mass %.
Additionally, as is apparent from Table 1, in the secondary battery according to Example 1 using the separator including the solid electrolyte layer containing an electrolyte salt, the charge-and-discharge efficiency in the charge-and-discharge cycle is more excellent than the charge-and-discharge efficiency of the secondary battery according to Example 3 using the separator including the solid electrolyte layer containing no electrolyte salt.
As can be seen from the results of Examples 1, 6, and 7, excellent performances can be obtained even if the type of the polymeric material contained in the solid electrolyte layer is changed. As can be seen from the results of Examples 1 and 9, excellent performances can be obtained even if the type of the electrolyte salt contained in the solid electrolyte layer is changed. As can be seen from the results of Examples 1 and 8, excellent performances can be obtained even if the type of the positive electrode active material is changed. As can be seen from the results of Examples 1 and 10, excellent performances can be obtained even if the type of the negative electrode active material is changed.