Large-scale energy storage systems are urgently needed to enable the success of renewable but intermittent energy sources such as solar and wind power. Sodium ion batteries (SIBs) are a promising technology to address the need for large-scale energy storage systems, but their performance needs improvement to be competitive for this application. Multiphase layered transition metal oxides (LTMOs) for SIB positive electrodes with phase interfaces across multiple length scales are a promising avenue toward practical, high-performance SIBs. Combinations of phases can complement each other’s strengths and mitigate their weaknesses if their interfaces are carefully controlled. Intra- and inter-particle phase interactions from nanoscale to macroscale must be carefully tuned to generate distinct effects on properties and performance. An informed design strategy must be paired with relevant synthesis techniques and complemented by spatially resolved characterization tools in order to manipulate different length scales and interfaces. In this talk, we will discuss the design, synthesis, and characterization strategies that have been demonstrated for the preparation of heterogeneous, multiphasic LTMOs.

Multiphase layered transition metal oxide positive electrodes for sodium ion batteries

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