High energy storage of Li-ions on keggin-type polyoxometalate as electrodes for rechargeable lithium batteries

In the result of increasing energy demand, rechargeable Li-ion batteries with high energy density are suitable sustainable power sources for the energy storage generations. Keggin-type polyoxometalates (POM) are being regarded as an electrode material for energy storage devices, though advanced improvement is adaptable for futuristic applications. Consequently, we demonstrate [PMo10V2O40]−5 POM with hydrogen and lithium as counter cations for anode and cathode synthesize by simple and cost-effective method, with the average energy densities of 230 Wh g−1 and 329.4 Wh g−1. The material with lithium cation deliver high initial specific capacity 1414 mAh g−1 for anode and 332 mAh g−1 for cathode at 0.1C than the material with the hydrogen cation. Among which, the cathode seems favorable with long and stable cycle life. The structural, compositional, morphological and electrochemical studies are explored from the various physical and electrochemical techniques. Also the geometry optimization of POM with hydrogen and lithium clusters is studied from the computational studies. In these cluster with lithium cation acts as a promising electrodes for Li-ion rechargeable batteries. In the present article, we investigated keggin type POM with hydrogen and lithium as counter cation with their physical, structural, morphological, compositional and electrochemical attributes for the cathode and anode materials for rechargeable lithium batteries. POM with the lithium as counter cation exhibits better capacity and long cycling stability as an electrode material. The 22 electron insertion in the cluster facilitates the better capacity with improved energy density. [Display omitted] •Keggin-type POM synthesis is simple; required temperature below 200 °C.•Li4HPMo10V2O40 clusters is not used anywhere in battery applications.•The 22 electron insertion in the POM ease stable cycling at higher current rates.•POM with lithium as counter cation exhibits better capacity and energy density.•It can lay the groundwork for future electrodes in various applications as well.