阴极
插层(化学)
正交晶系
材料科学
扫描透射电子显微镜
透射电子显微镜
阳极
分析化学(期刊)
电化学
扫描电子显微镜
电子能量损失谱
相(物质)
化学
电极
无机化学
结晶学
纳米技术
物理化学
晶体结构
有机化学
复合材料
色谱法
作者
Arijita Mukherjee,Niya Sa,Patrick J. Phillips,Anthony K. Burrell,John T. Vaughey,Robert F. Klie
标识
DOI:10.1021/acs.chemmater.6b05089
摘要
Batteries based on Mg metal anode can promise much higher specific volumetric capacity and energy density compared to Li-ion systems and are, at the same time, safer and more cost-effective. While previous experimental reports have claimed reversible Mg intercalation into beyond Chevrel phase cathodes, they provide limited evidence of true Mg intercalation other than electrochemical data. Transmission electron microscopy techniques provide unique capabilities to directly image Mg intercalation and quantify the redox reaction within the cathode material. Here, we present a systematic study of Mg insertion into orthorhombic V2O5, combining aberration-corrected scanning transmission electron microscopy (STEM) imaging, electron energy-loss spectroscopy (EELS), and energy-dispersive X-ray spectroscopy (EDX) analysis. We compare the results from an electrochemically cycled V2O5 cathode in a prospective full cell with Mg metal anode with a chemically synthesized MgV2O5 sample. Results suggest that the electrochemically cycled orthorhombic V2O5 cathode shows a local formation of the theoretically predicted ϵ-Mg0.5V2O5 phase; however, the intercalation levels of Mg are lower than predicted. This phase is different from the chemically synthesized sample, which is found to represent the δ-MgV2O5 phase.
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