| 摘要 |
PURPOSE:To provide a secondary battery having excellent safety and charging/ discharging cyclic characteristic by mixing carbon with powder of a neg. electrode material which can occlude and release Li electrochemically and on whose surface an oxide film is formed. CONSTITUTION:Through a heat treatment in a gas atmosphere including oxygen, an oxide film is formed on the surface of a neg. electrode material such as a fusible alloy which can occlude and release Li electrochemically and Al, and this is mixed with carbon. Even through this fusible alloy, Al, makes repetition of expansion and contraction associated with charging/discharging to cause change in the shape, slipping-off from the core 3 is prevented and electricity collection held practicable by pulverizing them, forming such an oxide film, and mixing with carbon. This prevents drop of the charging/discharging capacity with cycles and also generation of internal shortcircuiting and firing. |
