| 摘要 |
The lithium-ion battery provided by the present invention has an electrode assembly (30) obtained by superposing and winding together a long continuous positive electrode sheet (32) and negative electrode sheet (34) with a separator (35) interposed therebetween. An active material layer (344) is formed on the negative electrode sheet (34), with a band-shaped margin being left on one edge thereof along the lengthwise direction of the collector (342). The above band-shaped portion (342a) sticks out beyond the edge of the positive electrode sheet (32). On the exterior surface of the negative active material layer (344), a porous inorganic layer (346) is formed starting at the flat part (344a) of the active material layer, wrapping around the edge (344b) thereof, and extending to the surface of the collector (342). The porosity Pa at the edge (344b) of the inorganic layer (346) is less than the porosity Pb at the flat part (344a) thereof. |
