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We report the electrochemical intercalation–extraction of aluminum (Al) in the layered TiS 2 and spinel-based cubic Cu 0.31 Ti 2 S 4 as the potential cathode materials for rechargeable Al-ion batteries. The electrochemical characterizations demonstrate the feasibility of reversible Al intercalation in both titanium sulfides with layered TiS 2 showing better properties. The crystallographic study sheds light on the possible Al intercalation sites in the titanium sulfides, while the results from galvanostatic intermittent titration indicate that the low Al 3+ diffusion coefficients in the sulfide crystal structures are the primary obstacle to facile Al intercalation–extraction.
Geng et al. (Thu,) studied this question.