Abstract
A 5 V-class LiNi(0.5)Mn(1.5)O(4) (LNMO) positive electrode has excellent potential for increasing the energy density of solid-state Li batteries. In this study, we report the stable cycling of a solid thin-film Li battery using a densely packed LNMO crystal layer, which has a high packing density and a well-developed crystal plane. Annealing a battery reduces the resistance at the interface of a Li(3)PO(4) solid electrolyte and LNMO for an order of magnitude, from 5.3 × 10(2) to 5.7 × 10(1) Ωcm(2), enhancing the battery performance. This paper lays the groundwork for developing all-solid-state Li batteries using densely packed LNMO layers.