Li3-2xB1-xNxO3(x=0.1,0.2,0.3)锂离子固体电解质的制备和性能研究

Preparation and characterization of Li3-2xB1-xNxO3(x=0.1,0.2,0.3)solid electrolytes

摘要:

首次以硝酸锂、碳酸锂、氧化硼为原料,采用固相法制备得到了Li_3-2xB_1-xN_xO₃(x=0.1,0.2,0.3)锂离子固体电解质,通过无压烧结制备得到固体电解质片,并通过x射线衍射(XRD),扫描电子显微镜(SEM),电化学交流阻抗(EIS)对Li_3-2xB_1-xN_xO₃(x=0.1,0.2,0.3)固态电解质进行了表征。结果表明：当x=0.2时,采用无压烧结在600℃烧结10 h制备得到的固体电解质片致密度最高,达到理论密度的90.07%,室温锂离子总电导率也最大,为6.37×10_-6 S/cm,此时激活能值最小,为0.48eV。

Abstract:

Samples of Li_3-2xB_1-xN_xO₃(x=0.1,0.2,0.3)compound with pure phase were obtained by coprecipitation method at the first time.Lithium nitrate, lithium carbonate and boron oxide were as the raw materials.The Li_3-2xB_1-xN_xO₃(x=0.1,0.2,0.3)precursor powders were sintered via pressureless sintering.And Li_3-2xB_1-xN_xO₃(x=0.1,0.2,0.3)solid electrolytes were characterized by x-ray diffraction (XRD), scanning electron microscopy (SEM) and electrochemical impedance spectroscopy (EIS). The results show that samples Li_2.6B_0.8N_0.2O₃ sintered at 600℃ by the non pressure sintering showed the highest total conductivity of 6.37×10_-6S/cm.The activation energy is 0.48 eV at 250~390K. And its density is the reaching 90.07% of theoretical density.