ELECTRODE FOR SECONDARY BATTERY, SECONDARY BATTERY, BATTERY PACK, ELECTRIC VEHICLE, POWER STORAGE SYSTEM, ELECTRIC POWER TOOL, AND ELECTRONIC APPARATUS

摘要

PROBLEM TO BE SOLVED: To provide a secondary battery capable of obtaining excellent battery characteristics.SOLUTION: The secondary battery includes: a positive electrode; a negative electrode; an electrolyte; and an intermediate layer, disposed between the positive electrode and the negative electrode, containing at least one kind of polyphosphate, melamine salt, melamine derivative, metalhydroxide, and metal hydrate. A part of the intermediate layer penetrates into at least one of the positive electrode and the negative electrode.