| 摘要 |
PROBLEM TO BE SOLVED: To provide an electrochemical device which is superior in cyclic properties, high in capacitance, and of high-energy density type. SOLUTION: An electrode contains oxy iron hydroxide-coated high-electron conductivity particulates that are each composed of a high-electron conductivity particulate, having a specific surface area of 5 m<2> /g to 100 m<2> /g and an average grain diameter of 50 nm or below as a primary particle and oxy iron hydroxide covering the high-electron conductivity particulate. A lithium intercalation electrode contains lithium ions and functions as the counter electrode of the former electrode. These two electrodes are arranged through the intermediary of an electrolyte so as to compose an electrochemical device. The oxy iron hydroxide can be substituted by crystalline β-FeOOH or amorphous material containing, at least, one out of Ti, V, and Cu. It is preferable that acetylene black is used as the high-electron conductivity particulates. |
