X射线光电子能谱
材料科学
阴极
晶体结构
离子
氧化物
兴奋剂
化学工程
钾
纳米技术
结晶学
光电子学
化学
物理化学
冶金
工程类
有机化学
作者
Ruling Huang,Qilong Xue,Jiao Lin,XiXue Zhang,Jiahui Zhou,Feng Wu,Li Li,Renjie Chen
出处
期刊:Nano Research
[Springer Nature]
日期:2021-10-18
卷期号:15 (4): 3143-3149
被引量:10
标识
DOI:10.1007/s12274-021-3863-4
摘要
Layered Mn-based oxides are one of the promising cathode materials for potassium-ion batteries (KIBs) owing to their high theoretical capacities, abundant material supply, and simple synthesis method. However, the structural deterioration resulting from the Jahn-Teller effect of Mn ions hinders their further development in KIBs. Herein, a novel Mn-based layered oxide, K0.54Mn0.78Mg0.22O2, is successfully designed and fabricated as KIBs cathode for the first time. It delivers smooth charging/discharging curves with high specific capacity of 132.4 mA·g-1 at 20 mA·g-1 and good high-rate cycling stability with a capacity retention of 84% over 100 cycles at 200 mA·g-1. Combining in-situ X-ray diffraction (XRD) and ex-situ X-ray photoelectron spectroscopy (XPS) analysis, the storage of K-ions by K0.54Mn0.78Mg0.22O2 is revealed to be a solid-solution processes with reversible slip of the crystal lattice. The studies suggest that the rational doping of inactive Mg2+ can effectively suppress the Jahn-Teller effect and provide outstanding structure stability. This work deepens the understanding of the structural evolution of Mn-based layered materials doped with inactive materials during de/potassiation processes.
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