Zhang Fenglong, Wang Hui, Ji Shan, Linkov Vladimir, Wang Xuyun, Wang Rongfang
State Key Laboratory Base for Eco-Chemical Engineering, College of Chemical Engineering, Qingdao University of Science and Technology, 266042, Qingdao, China.
College of Biological, Chemical Science and Chemical Engineering, Jiaxing University, 314001, Jiaxing, China.
Chemphyschem. 2022 Apr 5;23(7):e202100811. doi: 10.1002/cphc.202100811. Epub 2022 Feb 23.
Lithium-sulfur batteries are promising secondary energy storage devices that are mainly limited by its unsatisfactory cyclability owing to inefficient reversible conversion of sulfur and lithium sulfide on the cathode during the discharge/charging process. In this study, nitrogen-doped three-dimensional porous carbon material loaded with CoSe nanoparticles (CoSe -PNC) is developed as a cathode for lithium-sulfur battery. A combination of CoSe and nitrogen-doped porous carbon can efficiently improve the cathode activity and its conductivity, resulting in enhanced redox kinetics of the charge/discharge process. The obtained electrode exhibits a high discharge specific capacity of 1139.6 mAh g at a current density of 0.2 C. After 100 cycles, its capacity remained at 865.7 mAh g thus corresponding to a capacity retention of 75.97 %. In a long-term cycling test, discharge specific capacity of 546.7 mAh g was observed after 300 cycles performed at a current density of 1 C.
锂硫电池是很有前景的二次储能装置，但其主要受限于充放电过程中阴极上硫和硫化锂的可逆转化效率低下，导致其循环性能不尽人意。在本研究中，负载有硒化钴纳米颗粒的氮掺杂三维多孔碳材料（CoSe -PNC）被开发用作锂硫电池的阴极。硒化钴和氮掺杂多孔碳的结合可以有效提高阴极活性及其导电性，从而增强充放电过程的氧化还原动力学。所制备的电极在0.2 C的电流密度下表现出1139.6 mAh g的高放电比容量。经过100次循环后，其容量保持在865.7 mAh g，因此容量保持率为75.97%。在长期循环测试中，在1 C的电流密度下进行300次循环后，观察到放电比容量为546.7 mAh g。
