Power storage device and method for manufacturing electrode

A power storage device comprising:

• a negative electrode comprising:
• a current collector;
• a first active material layer over the current collector;
• and
• a second active material layer that is over the first active material layer and includes a particle containing niobium oxide and a granular active material;
• an electrolyte in contact with the negative electrode;
• and
• a positive electrode facing the negative electrode with the electrolyte interposed therebetween.

A method for manufacturing an electrode, comprising the steps of:

• forming a first active material layer over a current collector;
• applying, to the first active material layer, a slurry including a binder, a conductive additive, a particle containing niobium oxide, and a granular active material;
• and
• performing baking the slurry to form a second active material layer including the particle containing niobium oxide and the granular active material over the first active material layer,
• wherein the particle containing niobium oxide is formed by a sol-gel method.