Properties of LiMnBO3 glasses and nanostructured glass-ceramics

TL;DR

This study explores the thermal, structural, and electrical properties of LiMnBO3 glasses and nanostructured glass-ceramics, revealing significant conductivity enhancement through nanocrystallization, which benefits lithium-ion battery cathodes.

Contribution

It demonstrates that nanocrystallization of LiMnBO3 glass significantly increases electrical conductivity, offering new insights for battery material development.

Findings

Electrical conductivity of glass increased by 6 orders of magnitude after nanocrystallization.

Nanostructured glass-ceramics exhibit higher conductivity than previously reported manganese borate glasses.

The glass contains two distinct phases, influencing its ionic and electronic transport properties.

Abstract

Polycrystalline LiMnBO3 is a promising cathode material for Li-ion batteries. In this work, we investigated the thermal, structural and electrical properties of glassy and nanocrystallized materials having the same chemical composition. The original glass was obtained via a standard meltquenching method. SEM and 7Li solid-state NMR indicate that it contains a mixture of two distinct glassy phases. The results suggest that the electrical conductivity of the glass is dominated by the ionic one. The dc conductivity of initial glass was estimated to be in the order of 10-18 S.cm-1 at room temperature. The thermal nanocrystallization of the glass produces a nanostructured glass-ceramics containing MnBO3 and LiMnBO3 phases. The electric conductivity of this glass-ceramics is increased by 6 orders of magnitude, compared to the starting material at room temperature. Compared to other manganese and borate containing glasses reported in the literature, the conductivity of the nanostructured glass ceramics is higher than that of the previously reported glassy materials. Such improved conductivity stems from the facilitated electronic transport along the grain boundaries.