An ultimately safe bulk-type all-solid-state lithium battery (ASSLB) where highly conductive sulphide solid electrolyte (SE) powders and active materials are mixed in the electrode layer attracts much attention as large-scale rechargeable batteries for electric vehicles and smart grids emerge.Applying the conventional LixMO2 (M = Co, Ni, Mn) cathode materials to ASSLBs using the sulfide SEs, however, resulted in poor performances, which originates from the instability of the sulfide SEs under ~3 V (vs. Li/Li+) and incompatibility between LixMO2 and the sulfides. In this regard, transition metal sulfides can be attractive candidates due to their mild operating voltage (< ~3 V) and possibly favorable sulfide-sulfide interface. The low operating voltages of the transition metal sulfides, however, should be offset by increasing the capacity.In this regard, Ti-based sulfide cathode materials that exhibit high capacity in ASSLB using sulfide SE are investigated. First, LiTi2(PS4)3 (LTPS) cathode material was tested. The XRD pattern of the as-prepared 75Li2S-25P2S5 glassc-eramic SE with 1.0 � 10-3 S cm-1 at 30 oC in Fig. 1a corresponds with a thio-LISICON III analogue. In Fig. 1b, the LTPS exhibits a high first discharge capacity over 400 mA h g-1 with good cycling retention between 1.5 and 3.5 V. In sharp contrast, LTPS with a liquid electrolyte (LE) shows fast capacity fading. Second, TiS2-based nanostructured electrode for ASSLB is presented.

All-solid-state lithium batteries using Ti-based cathode materials and sulfide solid electrolyte

248th National Meeting (2014)

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