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首页> 外文期刊>International Journal of Technology >Synthesis and Electrochemical Characterization of New Li2O-P2O5 Compounds for Solid Electrolytes
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Synthesis and Electrochemical Characterization of New Li2O-P2O5 Compounds for Solid Electrolytes

机译：用于固体电解质的新型Li2O-P2O5化合物的合成及电化学表征

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The solid electrolyte is of great interest owing to its potential to be applied in a wide variety of electrochemical devices. One of the most stable solid electrolytes is lithium phosphate (Li3PO4). However, this compound has low enough conductivity to be applied to a device such as an electrolyte. A previous study has reported that the mixture of xLi2O-P2O5, where x=2, has a greater conductivity than Li3PO4, while, when x=1, this yields an amorphous structure. In this study, new compositions of the xLi2O-P2O5 compounds, where 1?x?2, were prepared through solid-state reactions. The prepared compounds were characterized using X-ray Diffraction Spectrometry (XRD), Scanning Electron Microscopy (SEM), and Electrochemical Impedance Spectroscopy (EIS) measurements in order to investigate their structure, morphology, and electrochemical properties. The XRD characterization showed that both of the samples were composed mainly of Li4P2O7 crystals. Agglomeration of particles was observed in the samples. The conductivity of the compounds was of the order of 10?6 S/cm, which was higher by three orders of magnitude than that of Li3PO4. The evaluated power exponent of conductivity indicated that the long-range drift of ions may be one of the sources of ion conduction in both of the observed samples. The nature of the dielectric loss indicated that the conduction in the samples was more predominantly DC conduction.
机译：固体电解质由于其在各种电化学装置中的应用潜力而备受关注。最稳定的固体电解质之一是磷酸锂（Li3PO4）。然而，该化合物具有足够低的电导率以应用于诸如电解质的装置。先前的研究报道，xLi2O-P2O5的混合物（其中x = 2）比Li3PO4具有更大的电导率，而当x = 1时，这会产生非晶结构。在这项研究中，通过固态反应制备了新的xLi2O-P2O5化合物，其中1？x？2。使用X射线衍射谱（XRD），扫描电子显微镜（SEM）和电化学阻抗谱（EIS）测量对制备的化合物进行表征，以研究其结构，形态和电化学性质。 XRD表征表明，两个样品均主要由Li4P2O7晶体组成。在样品中观察到颗粒的团聚。化合物的电导率约为10-6 S / cm，比Li3PO4高出三个数量级。电导率的评估功率指数表明，离子的长距离漂移可能是两个观察到的样品中离子传导的来源之一。介电损耗的性质表明样品中的传导主要是直流传导。

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