Preparation of Lithium Sulfide-Based Cathode Materials and Application to All-Solid-State Batteries

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  • MATSUDA Atsunori
    Department of Electrical and Electronic Information Engineering, Toyohashi University of Technology
  • HIKIMA Kazuhiro
    Department of Electrical and Electronic Information Engineering, Toyohashi University of Technology

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<p>All-solid-state Li–S batteries with Li2S cathode active materials have attracted considerable attention owing to their high theoretical energy densities; however, the improvement of electron, ion conductivity and the activation of the redox reaction of Li2S is challenging owing to its insulating behavior. The addition of multivalent cations (such as Mg2+, Ca2+, Al3+, and Y3+) to Li2S results in a higher discharge capacity, thereby improving the ionic conductivity and reactivity of Li2S. These cations can form solid solutions or nanocomposites, and may also exhibit catalytic activity. The ionic radii of Mg2+ (0.57 Å) and Al3+ (0.35 Å) are similar to that of Li+ (0.59 Å); therefore, these additives are expected to form solid solutions. The ionic radius of Ca2+ (1.0 Å) is larger than that of Li+ (0.59 Å), resulting in the formation of CaS–Li2S nanocomposites. Y3+ tends to segregate at the grain boundaries, while Y3+ on the surface of Li2S particles exhibits catalytic effects. This review summarizes the effects of multivalent cation doping on the activation of Li2S-based cathode materials.</p>

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