Development of miniaturized SAF-LIBS with high repetition rate acousto-optic gating for quantitative analysis

The self-absorption effect in laser-induced breakdown spectroscopy(LIBS) reduces the accuracy of quantitative measurement results.The self-absorption-free LIBS(SAF-LIBS) has been proved to directly capture the optically thin plasma spectra by setting an appropriate exposure time.In this work,a novel SAF-LIBS technique with high repetition rate acousto-optic gating is developed,in which an acousto-optic modulator is used as the shutter to diffract the optically thin fluorescence,and a high repeti...     

rGO-S-CPEs复合正极的制备及其全固态锂硫电池的电化学性能

聚合物基复合电解质(CPE)应用于全基固态锂硫电池在保证高能量密度的同时，改善了电解质与电极之间的界面接触，具有更为广阔的应用前景。但硫正极固有的绝缘性会导致较低的电子/离子传输速率，通常选用高导电性的碳材料和高离子电导率的电解质材料来改善复合硫正极的电子/离子传输速率。制备了高离子电导率的聚合物基聚氧化乙烯(PEO)-双三氟甲磺酰亚胺锂(LiTFSI)-锆酸镧锂(LLZO)复合电解质，在20和60℃下离子电导率分别为1.16×10^-4和7.26×10^-4S/cm，同时将其与硫-还原氧化石墨烯制备rGO-S-CPEs复合硫正极，在改善了正极中离子传输速率的同时，取代了粘结剂的作用。探究了正极材料中不同含量的复合电解质对电池性能的影响。测试结果表明，当硫正极中复合电解质含量为40%(质量分数)时，全固态锂硫电池的电化学性能最佳，在0.2 C、45℃下，首次充放电比容量为923 mAh/g,50次循环后比容量为653 mAh/g。