Enrich properties of Li+-based battery anode: Li_4Ti_5O_12

TL;DR

This paper uses first-principles calculations to analyze the complex electronic structure and bonding characteristics of Li_4Ti_5O_12, a promising anode material for lithium-ion batteries, revealing its unique lattice symmetry and electronic properties.

Contribution

It provides a detailed theoretical analysis of Li_4Ti_5O_12's electronic structure, bonding, and lattice symmetry, enhancing understanding of its properties as a battery anode.

Findings

Li_4Ti_5O_12 is a large direct-gap semiconductor with E_g^d~ 2.98 eV.

The material exhibits complex multi-orbital hybridizations in Li-O and Ti-O bonds.

The study introduces a theoretical framework applicable to oxide cathodes and electrolytes.

Abstract

The 3D ternary Li_4Ti_5O_12, the Li+-based battery anode, presents the unusual lattice symmetry (a triclinic crystal), band structure, charge density, and density of states, under the first-principles calculations. It belongs to a large direct-gap semiconductor of E_g^d~ 2,98 eV. The atom-dominated valence and conduction bands, the spatial charge distribution and the atom- and orbital-decomposed van Hove singularities are available in the delicate identifications of multi-orbital hybridizations in Li-O and Ti-O bonds. The extremely non-uniform chemical environment, which induce the very complicated hopping integrals, directly arise from the large bonding fluctuations and the highly anisotropic configurations. Also, the developed theoretical framework is very useful for fully understanding the cathodes and electrolytes of oxide compounds.