Negative electrode for rechargeable battery

摘要

A negative electrode for a rechargeable battery including: a current collector (1a), a first layer (2a) containing a conductive material to occlude and release lithium ion, the first layer (2a) formed on the current collector (1a), a second layer (3a) containing a metal selected from lithium and lithium alloy, the second layer (3a) formed on the first layer (2a), and a third layer (4a) containing a lithium ion conductive material, the third layer (4a) formed on the second layer (3a). The third layer (4a) prevents the lithium and/or the lithium alloy in the second layer (3a) from being in contact with the electrolyte and smoothly feeds the lithium to the second layer (3a) to improve the efficiency of the negative electrode. The first layer (2a) can occlude and release the part of the lithium to be occluded and released, thereby reducing the volume change of the second layer (3a). Such a structure of the negative electrode enables us to enhance cycling efficiency, and to attain long cycle life and good safety.