A record-high ion storage capacity of T-graphene as two-dimensional anode material for Li-ion and Na-ion batteries

• Published in: Applied surface science 2020-10, Vol.527, p.146849, Article 146849
• Main Authors: Zhang, Xiaoming, Jin, Lei, Dai, Xuefang, Chen, Guifeng, Liu, Guodong
• Format: Article
• Language: English
• Subjects: Anode materials; Li-ion batteries; Na-ion batteries; T-graphene; Ultrahigh storage capacity
• ISSN: 0169-4332; 1873-5584
• DOI: 10.1016/j.apsusc.2020.146849

T-graphene can reach a record-high storage capacity among known 2D anode materials for Li-ion and Na-ion batteries. [Display omitted] •The feasibility of T-graphene as battery electrodes is systematically studied.•T-graphene shows record-high Li/Na storage capacities among 2D anode materials identified so far.•The specific capacity for Li is 2233.2 mA h g−1 and for Na is 2357.2 mA h g−1.•T-graphene is a superior anode with good conductivity, high capacity and fast ion diffusion. 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.