Electrochemical characteristics of aluminum sulfide for use in lithium secondary batteries |
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| Authors: | Hiroshi Senoh Tomonari Takeuchi Hikari Sakaebe Koji Nakanishi Tetsuo Sakai |
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| Affiliation: | a Research Institute for Ubiquitous Energy Devices (UBIQEN), National Institute of Advanced Industrial Science and Technology (AIST), 1-8-31 Midorigaoka, Ikeda, Osaka 563-8577, Japan
b Synchrotron Radiation Center (The SR Center), Ritsumeikan University, 1-1-1 Noji-Higashi, Kusatsu, Shiga 525-8577, Japan |
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| Abstract: | In our effect to develop a lithium secondary battery with high energy density, aluminum sulfide (Al2S3) was studied for use as an active material. The measured initial discharge capacity of Al2S3 was ca. 1170 mAh g−1 at 100 mA g−1. This corresponds to 62% of the theoretical capacity for the sulfide. Al2S3 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 Al2S3 reacts reversibly during charge and discharge processes, while the core of Al2S3 showed structural irreversibility because LiAl and Li2S were formed from Al2S3 at the initial discharge and remained as they were afterward. |
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| Keywords: | Lithium secondary battery Aluminum sulfide Charge-discharge curve Capacity retention X-ray diffraction X-ray absorption near edge structure |
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