Affiliation:
1. School of Applied Physics and Materials Wuyi University Jiangmen Guangdong 529020 China
2. Laboratory of Advanced Spectro‐Electrochemistry and Lithium‐Ion Batteries Dalian National Laboratory for Clean Energy Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian Liaoning 116023 China
3. Joint Key Laboratory of the Ministry of Education Institute of Applied Physics and Materials Engineering University of Macau Avenida da Universidade Taipa Macau SAR 999078 China
Abstract
AbstractThe 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 Re2Te5 anchored on MXene substrate (A/C‐Re2Te5/MXene) as an advanced anode for potassium‐ion batteries (KIBs). The A/C‐Re2Te5/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‐Re2Te5 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‐Re2Te5/MXene. This work offers a new approach for developing metal tellurides‐ and MXene‐based anodes for achieving stable cyclability and fast‐charging KIBs.
Funder
National Natural Science Foundation of China
Natural Science Foundation of Guangdong Province