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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Structural properties of alumina-doped lithium borovanadate glasses and glass-ceramics
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Structural properties of alumina-doped lithium borovanadate glasses and glass-ceramics

机译：氧化铝掺杂锂硼钒酸盐玻璃和玻璃陶瓷的结构性质

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摘要

This study elucidates the role of Al2O3 in the lithium borovanadate (LBV) system, Li2O-B2O3-V2O5, in improving the glass-forming region of LBV glass. This increased glass-forming tendency is likely due to formation of [AlO4](-) units. B-11, Al-27, and V-51 nuclear magnetic resonance measurements suggest an importance of V-O-Al linkages and distribution of Li for charge compensation of [AlO4](-) and [BO4](-) units. Intense V-51 NMR signals and resolved hyperfine coupling patterns in the electron paramagnetic resonance (EPR) spectra indicate that the majority of vanadium is pentavalent (V5+) and minor amounts of paramagnetic vanadium (V4+) are present. The EPR interaction parameters suggest that the vanadyl-like environments can be described as tetragonally compressed distorted octahedra. Based on V-2p(3/2) X-ray photoelectron spectroscopy, the V4+ concentration is estimated at < 3%. These vanadate glasses are attractive for energy storage applications, as they have higher specific capacities than commercial lithium-ion battery cathodes.
机译：该研究阐明了Al2O3在硼硼酸锂（LBV）系统，Li2O-B2O3-V2O5中的作用，改善了LBV玻璃的玻璃形成区域。这种增加的玻璃形成趋势可能是由于形成[ALO4]（ - ）单元的形成。 B-11，AL-27和V-51核磁共振测量表明V-O-Al连接和Li的重要性为[ALO4]（ - ）和[BO4]（ - ）单位的电荷补偿。在电子顺磁共振（EPR）光谱中的强烈V-51 NMR信号和分辨的高血清耦合图案表明大多数钒是五价（V5 +）和少量的顺磁钒（V4 +）。 EPR相互作用参数表明钒基环境可以被描述为四边形压缩扭曲的八面体。基于V-2P（3/2）X射线光电子能谱，V4 +浓度估计为<3％。这些钒玻璃对于储能应用具有吸引力，因为它们具有比商业锂离子电池阴极更高的比力。

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