Although MXenes is highly attractive as anode materials of lithium ion batteries, it sets a bottleneck for higher capacity of the V₂CT_x MXene due to the limited interlayer space and the derived surface terminations. Herein, the cation intercalation and ion-exchange were well employed to achieve a K⁺ and Ca²⁺ intercalated V₂CT_x MXene. A larger interlayer distance and low F surface terminations were thereof obtained, which accelerates the ion transport and promotes the delicate surface of V₂CT_x MXene. As a result, a package of enhanced capacity, rate performance and cyclability can be achieved. Furthermore, the ion exchange approach can be extended to other 2D layered materials, and both the interlayer control and the surface modification will be achieved.

尽管MXenes作为锂离子电池的负极材料极具吸引力，但由于有限的层间空间和派生的表面终端，它为V ₂ CT _x MXene的更高容量设置了瓶颈。在本文中，阳离子嵌入和离子交换被很好地用来获得K ⁺和Ca ²⁺嵌入的V ₂ CT _x MXene。获得较大的层间距离和低F表面终止，这加速了离子传输并促进了V ₂ CT _x的精细表面MXene。结果，可以获得增强的容量，速率性能和可循环性的包装。此外，离子交换方法可以扩展到其他2D分层材料，并且可以实现层间控制和表面修饰。