A Record-High Ion Storage Capacity of T-Graphene as Two-Dimensional Anode Material for Li-ion and Na-ion Batteries

TL;DR

This paper reports that T-graphene, a new 2D carbon material, exhibits record-high lithium and sodium ion storage capacities, significantly surpassing commercial graphite, due to its unique lattice structure and low atomic mass, making it highly promising for advanced batteries.

Contribution

The study introduces T-graphene as a novel 2D anode material with unprecedented ion storage capacity, supported by first-principles calculations.

Findings

T-graphene has a Li storage capacity of 2233.2 mA h g-1.

Na storage capacity of T-graphene reaches 2357.2 mA h g-1.

T-graphene exhibits stable ion adsorption and good electrical conductivity.

Abstract

Developing applicable two-dimensional (2D) electrode materials with high performance, especially with high ion storage capacity, has become an ever more obsessive quest in recent years. Based on first-principles calculations, we report that T-graphene, a new carbon-based 2D material, has a record-high Li/Na storage capacity. The capacity of T-graphene is as high as 2233.2 mA h g-1 for Li, and can reach 2357.2 mA h g-1 for Na, which are 6 times as much as that of the commercial graphite and are the highest among 2D anode materials identified so far. We demonstrate that the ultrahigh storage capacity of T-graphene mostly benefits from its low atomic mass and special periodic lattice structure. T-graphene has not only the ultrahigh storage capacity but also hosts the stable ion adsorption, good electric conductivity, fast ion diffusion speed, and low open-circuit voltage, which are merits required as a superior anode material for Li-ion and Na-ion batteries with ultrahigh storage capacity.