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

Abstract

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.