| abstract |
Provided is an electrode structure having a high power density and being superior in repetitive charge/discharge efficiency and an electric energy storage device using the electrode structure. The electrode structure includes an electrode material layer including an electrode material including active material particles containing at least one of silicon, tin and alloys containing at least one of them, and a binder binding the active material particles, the binder has the following characteristics: tensile modulus: 2000 MPa or more, breaking strength: 100 MPa or more, break elongation: 20% to 120% and the ratio of breaking strength/break elongation > 1.4 (MPa/%), and an average particle size of the particles is 0.5 μ m or less, the electrode structure has a maximum thermal history temperature less than 350 DEG C. and lower than the glass transition temperature of the binder. The electric energy storage device uses, as its negative electrode, the electrode structure. |