高离子传导纳米多孔β-Li3PS4固态电解质的湿化学法制备

Preparation of nanoporous β-Li3PS4 solid electrolyte with high ionic conductivity by wet chemical method

利用湿化学法,并采取逐步加热脱除沉淀中四氢呋喃分子的方式,制备具有高离子电导率和低活化能的纳米多孔β-Li 3PS 4固态电解质。利用同步热分析、X射线衍射、扫描电镜、拉曼光谱、氮气吸脱附和交流阻抗测试等手段研究不同处理阶段产物的形貌、结构和物相组成,并测试分析β-Li 3PS 4固态电解质的电化学性能。结果表明:采用该方法制备的纳米多孔β-Li 3PS 4固态电解质比表面积为 28.3m 2·g -1 ,平均孔径约23nm,电化学测试表明该电解质在20℃下的离子电导率为1.84×10 -4 S·cm -1 ,活化能为0.343eV,电子电导率为1.3×10 -8 S·cm -1 ,具有优异的电化学稳定性,与金属锂负极也具有良好的兼容性。

The β-Li 3PS 4 solid electrolyte with high ionic conductivity and low activation energy was prepared by wet chemical method and stepwise heated to remove tetrahydrofuran molecules from the precipitate. The morphology, structure and phase composition of the products at different treatment stages were studied by means of simultaneous thermal analysis, X-ray diffraction, scanning electron microscopy, Raman spectroscopy, N 2 adsorption/desorption and AC impedance spectroscopy, and the electrochemical performance of β-Li 3PS 4 solid electrolyte were analyzed. The results show that the specific surface area of the nanoporous β-Li 3PS 4 solid electrolyte prepared by this method is 28.3m 2·g -1 and its average pore diameter is about 23nm. Electrochemical characterization shows that the ionic conductivity of the electrolyte at 20℃ is 1.84×10 -4 S·cm -1 , the activation energy is 0.343eV, and the electronic conductivity is 1.3×10 -8 S·cm -1 . In addition, the electrolyte has excellent electrochemical stability and good compatibility with the lithium anode.