材料科学
阳极
扩散
动力学
离子
扩散阻挡层
八面体
钾
涂层
化学工程
纳米技术
电极
物理化学
热力学
图层(电子)
冶金
有机化学
化学
物理
量子力学
工程类
作者
Xinyue Feng,Yanqin Shi,Aiguo Hu,Ruiping Feng,Zhubing Xiao
标识
DOI:10.1021/acsami.3c12421
摘要
Achieving fast and durable potassiation/depotassiation of anode materials for potassium ion batteries (PIB) still remains an elusive yet fascinating goal. Herein, we challenge the conventional wisdom in synthesizing the TiP2O7 superstructure and report a nanocarbon coating on TiP2O7 (TiP2O7/C) using layered MXene as a Ti source to realize an effective tuning in the TiO6 and PO4 building blocks for boosting the K+ diffusion kinetics in PIB. Experimental investigations coupled with systematic theoretical simulations indicate that the interface interaction between TiP2O7 and coated nanocarbon could induce internal adjustment in individual Ti-O bonding and relieve the local distortions of TiO6 octahedra, which endows the TiP2O7/C with favorable regulation in a K+ hopping manner and significantly reduces the K+ diffusion barrier via the diffusion propagation along PO4 blocks with dominant coordination between O/P and K+. Consequently, the TiP2O7/C anode could retain 230 mA h g-1 even after 2200 long-term cycles with an ultralow degradation rate of 0.005%.
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