Improvement of Interfacial Properties of Sulfide Based All-Solid-State Lithium Secondary Batteries with Li-Si Alloy Anode

Wednesday, 27 May 2015
Salon C (Hilton Chicago)
J. S. Jin (Changwon National University), H. W. Park (RIST), and H. T. Lim (Changwon National University)
Li22Si5 alloy powder was synthesized by mechanical alloying and its electrochemical performance was investigated for use in solid-state battery anodes. Using these anode materials, all-solid-state lithium batteries were assembled with Li4Ti5O12 (LTO) or titanium disulfide (TiS2) as cathode and Li2S-P2S5 as electrolyte. Galvanostatic charge/discharge tests were also performed, and capacity was increased about two times by the additional powder milling process with gradient sturucure, which is consistent with the impedance results. Thus, the results from the present work indicate that using the secondary milling process to refine the electrode powder and gradient structure to reduce interfacial resistance are effective ways to increase the kinetics of alloying and de-alloying with higher utilization of anode active material in all-solid-state lithium secondary batteries.