Polyoxovanadate-polymer hybrid electrolyte in solid state batteries

Abstract

All-solid-state batteries are emerging as the new generation devices for safe and stable energy storage. However, insufficient ion conductivity of solid electrolyte impairs their practical applications. Herein, a series of fast alkali-ion conductor, polymer/polyoxovanadate hybrid nanowires were fabricated as solid electrolyte by a facile and scalable polyoxovanadate-induced self-assembly method. Combining abundant mobile alkali-ions and terminal oxygen atoms (Lewis base sites) of polyoxovanadates with the ion-migration favoured nanowire assemblage, ultrahigh ion conductivities of universal alkali-ions (25 ​°C, 3.30 ​× ​10−3, 2.00 ​× ​10−3, and 4.55 ​× ​10−3 ​S ​cm−1 for Li+, Na+ and K+ respectively) with low active energies are achieved. Remarkably, the hybrid solid-state electrolytes were applied in solid-state lithium and potassium batteries, exhibiting remarkable rate capability and comparable cycling stability. The chemical and structural design of polyoxometalate/polymer hybrid solid-state electrolyte shed light on the material design and chemical investigation of next-generation all-solid-state batteries.