Two-Dimensional GaN: An Excellent Electrode Material Providing Fast Ion Diffusion and High Storage Capacity for Li-Ion and Na-Ion Batteries

TL;DR

This paper proposes 2D GaN as a promising anode material for Li- and Na-ion batteries, offering high storage capacity and fast ion diffusion, which could enhance battery performance.

Contribution

The study introduces 2D GaN monolayer as a novel anode material with exceptional storage capacity and rapid ion diffusion, outperforming existing 2D materials.

Findings

GaN monolayer exhibits stable Li/Na adsorption.

High storage capacities of 938 mA h g-1 for Li and 625 mA h g-1 for Na.

Extremely low diffusion barriers of 80 meV for Li and 22 meV for Na.

Abstract

Identifying applicable anode materials is a significant task for Li- and Na-ion battery (LIB and NIB) technologies. We propose the GaN monolayer (2D GaN) can be a good anode candidate. The GaN monolayer manifests stable Li/Na adsorption and inherently low theoretical voltages. Most excitingly, both high storage capacity and extremely fast Li/Na diffusion can be simultaneously realized in the GaN monolayer. For Li, the storage capacity and diffusion barrier is 938 mA h g-1 and 80 meV , respectively. And the values for Na are 625 mA h g-1 and 22 meV. Comparing with known 2D anode materials with similar scale of ion diffusion barriers, the GaN monolayer almost possesses the highest Li/Na storage capacity discovered to date. Our work suggests that the 2D GaN is a prospective anode material offering fast ion diffusion and high storage capacity.