Structure and ionic conductivity in lithium garnets

Cussen, Edmund J. (2010) Structure and ionic conductivity in lithium garnets. Journal of Materials Chemistry, 20 (25). pp. 5167-5173. ISSN 0959-9428

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    Abstract

    Garnets are capable of accommodating an excess of lithium cations beyond that normally found in this prototypical structure. This excess lithium is found in a mixture of coordination environments with considerable positional and occupational disorder and leads to ionic conductivity of up to 4×10-4 S cm-1 at room temperature. This high value for total conductivity, combined with excellent thermal and (electro)chemical resistance makes these candidate materials for operation in all solid-state batteries. This review looks at garnets with a wide range of stoichiometries and lithium concentrations and the impact of complex lithium distributions and crystallographic order/disorder transitions on the transport properties of these materials.

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