Oligolayered Ti₃C₂T_x MXene towards high performance lithium/ sodium storage

2D MXenes are highly attractive for achieving ultrafast and stable lithium/sodium storage due to their good electric conductivity and abundant redox active sites. While, effective strategies for scalable preparation of oligolayered MXenes are still under exploration. Herein, oligolayered Ti₃C₂T_x MXene is successfully obtained after conventional synthesis of multilayered Ti₃C₂ and subsequent delamination process via an organic solvent of tetramethyl-ammonium hydroxide (TMAOH). Comprehensive electrochemical study reveals that surface-controlled redox reaction dominated the charge storage behavior of oligolayered Ti₃C₂T_x with fast reaction kinetics. Impressively, the obtained oligolayered Ti₃C₂T_x exhibits excellent lithium/sodium storage performance, featured for a high specific capacity of 330 mAh·g^-1 at 1.0 A·g^-1 after 800 cycles for lithium storage and 280 mAh·g^-1 at 0.5 A·g^-1 after 500 cycles for sodium storage. Such impressive performance will advance the development of oligolayered Ti₃C₂T_x based materials for lithium/sodium storage and even broaden their application into energy storage.