Abstract
In our effect to develop a lithium secondary battery with high energy density, aluminum sulfide (Al 2S 3) was studied for use as an active material. The measured initial discharge capacity of Al 2S 3 was ca. 1170 mAh g −1 at 100 mA g −1. This corresponds to 62% of the theoretical capacity for the sulfide. Al 2S 3 exhibited poor capacity retention in the potential range between 0.01 V and 2.0 V, mainly due to the structural irreversibility of the charge process or Li extraction. XRD and Al and S K-XANES analyses indicated that the surface of Al 2S 3 reacts reversibly during charge and discharge processes, while the core of Al 2S 3 showed structural irreversibility because LiAl and Li 2S were formed from Al 2S 3 at the initial discharge and remained as they were afterward.
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