Ye Wenkai, Wang Ke, Yin Weihao, Chai Wenwen, Rui Yichuan, Tang Bohejin
College of Chemistry and Chemical Engineering, Shanghai University of Engineering Science, Shanghai 201620, PR China.
Dalton Trans. 2019 Jul 21;48(27):10191-10198. doi: 10.1039/c9dt01961h. Epub 2019 Jun 13.
In this work, we synthesized a novel UIO-67@Se@PANI composite cathode material for Li-Se battery applications. Zr-MOFs (metal organic frameworks) were used as a support and a PANI (polyaniline) layer was employed as the coating. UIO-67@Se@PANI was expected to be one of the candidates for Li-Se batteries, with a high specific capacity of 248.3 mA h g at 1C (1C = 675 mA g) after 100 cycles. In particular, stable capacities of 203.1 and 167.6 mA h g were received after 100 cycles at high rates of 2C and 5C, respectively. To explain such a good electrochemistry performance of the composite cathode material, multiple characterization methods were carried out. And that can be attributed to the sandwich-like structure of the UIO-67@Se@PANI composite and the fact that UIO-67 can provide unsaturated sites to tether the selenium effectively and the PANI layer can improve the electronic conductivity of the whole electrode significantly.
在这项工作中，我们合成了一种用于锂硒电池的新型UIO-67@Se@PANI复合正极材料。以锆基金属有机框架（Zr-MOFs）为载体，并采用聚苯胺（PANI）层作为涂层。UIO-67@Se@PANI有望成为锂硒电池的候选材料之一，在1C（1C = 675 mA g）下经过100次循环后，其比容量高达248.3 mA h g。特别是，在2C和5C的高倍率下经过100次循环后，分别获得了203.1和167.6 mA h g的稳定容量。为了解释这种复合正极材料良好的电化学性能，我们采用了多种表征方法。这可以归因于UIO-67@Se@PANI复合材料的三明治结构，以及UIO-67能够提供不饱和位点来有效束缚硒，且聚苯胺层能够显著提高整个电极的电子导电性这一事实。
