Play with perovskite transformation and solve the problem of solid-state battery interface-Part 1
Lithium is most often contained in an oxide octahedron with a perovskite structure. However, there is a class of widely studied compounds in which lithium is introduced into a larger site, such as (La, Li)TiO3. These materials have attracted great interest due to fast ion conduction, such as Li0.34La0.5TiO2.94. This is due to the displacement of lithium from the center of the perovskite cube to occupy a four-coordinate twisted azimuthal plane. Although perovskite materials have diverse applications, their use in lithium-ion batteries is limited to a few reports, namely lithium lanthanum titanate as a fast lithium ion conductor and lithium lanthanum niobate as an intercalation electrode. As shown in Figure 1, the introduction of a second cation at the B-position will cause these cations to have different chemical sequences at different crystal points in the so-called double perovskite structure, which brings additional complexity.
Figure 1 Li1.5La1.5MO6 double perovskite crystal structure.
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