Negative electrode for power storage device and power storage device

A power storage device comprising:

• a positive electrode;
• a negative electrode;
• and
• an electrolyte,
• wherein the negative electrode comprises:
• a current collector;
• an active material layer over the current collector, the active material layer comprising a first particle of an active material, a second particle of the active material, and a first film comprising an inner surface on a first region of the first particle;
• a second film on the first film at the first region of the first particle;
• and
• a graphene,
• wherein the first film comprises a metal oxide,
• wherein the second film comprises an organic material and an inorganic material,
• wherein the second film is in contact with a second region of the first particle,
• wherein the graphene partly surrounds the second particle, and
• wherein the first particle comprises silicon.

A power storage device comprising:

• a positive electrode;
• a negative electrode;
• and
• an electrolyte,
• wherein the negative electrode comprises:
• a current collector;
• an active material layer over the current collector, the active material layer comprising a first particle of an active material, a second particle of the active material, and a first film comprising an inner surface on a first region of the first particle;
• a second film on the first film at the first region of the first particle;
• and
• a graphene,
• wherein the first film comprises a metal oxide,
• wherein the second film comprises an organic material and an inorganic material,
• wherein the second film is in contact with a second region of the first particle,
• wherein the graphene covers the first particle and the second particle, and
• wherein the first particle comprises silicon.