Engineering Oxygen‐Terminated Hexagonal MBene for Accelerated Lithium Migration and Exceptional Lithium‐Ion Battery Performance

作者：Qing Shen, Leyang Wang, Pengjie Jiang, Jinming Wang, Jinming Wang, Yaxin Di, Hui Mei, Junjie Wang, Junjie Wang, Laifei Cheng · 发表于：Advanced Science · 年份：2025 · DOI：10.1002/advs.202513674 · 被引用次数：8 · 研究领域：MXene and MAX Phase Materials、2D Materials and Applications、Graphene research and applications

Abstract Ultrathin 2D hexagonal transition metal borides ( h ‐MBenes) hold significant promise for advancing energy storage technologies. Herein, with cost‐effective methods and earth‐abundant metals, the experimental feasibility of atomically thin Ti‐based 2D h ‐MBenes (TiBT x ) for lithium‐ion battery application is reported for the first time. These thin‐layer nanosheets are synthesized by using ZnCl 2 molten salt as Ti 2 InB 2 etchant, followed with a delaminated intercalation of tetrabutylammonium hydroxide (denoted as d‐TiBT x ). The formation of disorderly low‐boiling‐point Zn‐In intermediate phase is revealed to significantly reduce the In migration energy barrier and accelerate the lattice‐In release from parent Ti 2 InB 2 under low‐temperature. Moreover, in‐depth analyses reveal that the formation of O‐termination on the atomic d‐TiBT x surface endows d‐TiBT x h ‐MBene with exceptional lithium‐ion migration, achieving an impressive specific capacity of 530 mAh g −1 at 0.1 A g −1 and an exceptional rate capability of 120 mAh g −1 at 10 A g −1 . Notably, a lithium full‐cell paired with a LiFePO 4 cathode achieves an impressive energy density of 425 Wh kg −1 and retains 94.3% of its capacity after 100 cycles, sufficient to power a toy car under normal operation. This work confirms the usefulness of ultrathin Ti‐based 2D MBenes, paving the way for innovatively harnessing the potential application of h ‐MBenes.