Wang Zhongquan, Wu Bangjun, Qiu Zhenping, Zeng Qingguang, Bayaguud Aruuhan, Wang Huirong, Liu Zheng, Li Yiju, Zhang Yelong
School of Renewable Energy, Inner Mongolia University of Technology, Ordos, 017010, China.
School of Applied Physics and Materials, Wuyi University, Jiangmen, Guangdong, 529020, China.
Adv Sci (Weinh). 2025 Jul;12(28):e2503332. doi: 10.1002/advs.202503332. Epub 2025 May 8.
Metal chalcogenides (MCs) have emerged as promising candidates for potassium ion battery (KIB) anode materials, yet the sluggish redox kinetics and notorious shuttle effect inescapability lead to inferior rate performance and poor cyclability. Herein, a P-doped PbTe/MXene (P-PbTe/MXene) superstructure is rationally constructed by decorating PbTe on MXene via a hydrothermal reaction and followed by bifunctional P-doping, where P heteroatoms enter both PbTe and MXene lattice. The P-PbTe/MXene anode shows enhanced reaction kinetics and suppressed shuttle effect of polytellurides due to the enhanced chemical adsorption stemming from the low energy gaps between the d-band center and the p-band center of P-MXene. As a result, the P-PbTe/MXene superstructure shows superior potassium storage properties, including high reversible capacity (289.1 mAh g at 0.2 A g after 200 cycles), outstanding rate performance (151.3 mAh g at 20 A g), and ultrastable cyclability (180.1 mA h g at 2.0 A g after 2000 cycles) in half battery. Also, the P-PbTe/MXene anode exhibits high energy density (186.0 Wh kg at 0.1 A g) and excellent bending stability in soft-package full cells.
金属硫族化合物（MCs）已成为钾离子电池（KIB）负极材料的有前景的候选者，然而缓慢的氧化还原动力学和不可避免的严重穿梭效应导致倍率性能较差和循环稳定性不佳。在此，通过水热反应在MXene上修饰PbTe并随后进行双功能P掺杂，合理构建了一种P掺杂的PbTe/MXene（P-PbTe/MXene）超结构，其中P杂原子同时进入PbTe和MXene晶格。由于P-MXene的d带中心与p带中心之间的低能隙导致化学吸附增强，P-PbTe/MXene负极表现出增强的反应动力学和对多碲化物穿梭效应的抑制。结果，P-PbTe/MXene超结构在半电池中表现出优异的钾存储性能，包括高可逆容量（200次循环后在0.2 A g下为289.1 mAh g）、出色的倍率性能（在20 A g下为151.3 mAh g）和超稳定的循环稳定性（2000次循环后在2.0 A g下为180.1 mA h g）。此外，P-PbTe/MXene负极在软包全电池中表现出高能量密度（在0.1 A g下为186.0 Wh kg）和出色的弯曲稳定性。
