A High‐Rate and Ultrastable Re <sub>2</sub> Te <sub>5</sub> /MXene Anode for Potassium Storage Enabled by Amorphous/Crystalline Heterointerface Engineering
Bangjun Wu, Yelong Zhang, Zhongquan Wang, Zhonghua Wang, Zhen Dong, Qingguang Zeng, Kwun Nam Hui, Zheng Liu, Zhangquan Peng
Abstract
Abstract The pursuit of anode materials capable of rapid and reversible potassium storage performance is a challenging yet fascinating target. Herein, a heterointerface engineering strategy is proposed to prepare a novel superstructure composed of amorphous/crystalline Re 2 Te 5 anchored on MXene substrate (A/C‐Re 2 Te 5 /MXene) as an advanced anode for potassium‐ion batteries (KIBs). The A/C‐Re 2 Te 5 /MXene anode exhibits outstanding reversible capacity (350.4 mAh g −1 after 200 cycles at 0.2 A g −1 ), excellent rate capability (162.5 mAh g −1 at 20 A g −1 ), remarkable long‐term cycling capability (186.1 mAh g −1 at 5 A g −1 over 5000 cycles), and reliable operation in flexible full KIBs, outperforming state‐of‐the‐art metal chalcogenides‐based devices. Experimental and theoretical investigations attribute this high performance to the synergistic effect of the A/C‐Re 2 Te 5 with a built‐in electric field and the elastic MXene, enabling improved pseudocapacitive contribution, accelerated charge transfer behavior, and high K + ion adsorption/diffusion ability. Meanwhile, a combination of intercalation and conversion reactions mechanism is observed within A/C‐Re 2 Te 5 /MXene. This work offers a new approach for developing metal tellurides‐ and MXene‐based anodes for achieving stable cyclability and fast‐charging KIBs.