Efficient optimization of the Li-ion conductivity of borovanadate glass materials for Li-ion batteries

The lithium-doped borovanadate glasses of high chemical purity are obtained via the traditional-melt quenching method. The obtained glasses are identified as having an amorphous character by XRD. DSC spectra reveal the glassy nature and good thermal stability of the prepared samples. FTIR spectroscopy reveals the structural groups of these glasses. The incorporation of Li+ ions into the glass modifies the boron coordination so that the boron coordination number changes from BO4 to BO3. The structural conversion of BO4 to BO3 boosts the number of NBOs. The increased number of NBOs indicates borate network depolymerization and a more open network structure, which leads to Li+ ions easily transferring in the glass network. This, in turn, optimizes the ionic conductivity of the present glassy system and can be of order 10-4 S.cm_ 1 at 300 K. This is the highest value of ionic conductivity reached by the borovanadate glasses at 300 K. Accordingly, borovanadate glasses containing lithium could pave the way for the use of glass materials as electrode material for Li-ion batteries.

Automated summary

Lithium-doped borovanadate glasses of high purity were obtained using the traditional melt-quenching method. The glasses were found to have an amorphous structure through XRD analysis and exhibited good thermal stability based on DSC spectra. FTIR spectroscopy revealed the structural groups present in the glasses. The introduction of Li+ ions modified the coordination of boron from BO4 to BO3, resulting in an increased number of NBOs and an improved ionic conductivity of the glassy system, making it a potential electrode material for Li-ion batteries.