Cen Tian, Zhang Yong, Tian Yanhong, Zhang Xuejun
Key Laboratory of Carbon Fiber and Functional Polymers, Ministry of Education, Beijing University of Chemical Technology, Beijing 100029, China.
Materials (Basel). 2020 Nov 16;13(22):5158. doi: 10.3390/ma13225158.
Natural halloysite nanotubes (HNTs) and reduced graphene oxide (RGO) were introduced into the S cathode material to form HNTs/S and RGO@HNTs/S composite electrode to improve the electrochemical performance of Li-S batteries. The effect of acid etching temperature on the morphology and pore structure of HNTs was explored and the morphological characteristics and electrochemical performance of composite electrodes formed by HNTs that after treatment with different acid etching temperatures and RGO were compared. The result shows that the cycling stability and the utilization rate of active substances of the Li-S battery were greatly improved because the pore structure and surface polarity functional groups of HNTs and the introduction of RGO provide a conductive network for insulating sulfur particles. The RGO@HNTs treated by acid treatment at 80 °C (RGO@HNTs-80/S) composite electrode at 0.1 C has an initial capacity of 1134 mAh g, the discharge capacity after 50 cycles retains 20.1% higher than the normal S electrode and maintains a specific discharge capacity of 556 mAh g at 1 C. Therefore, RGO and HNTs can effectively improve the initial discharge specific capacity, cycle performance and rate performance of Li-S batteries.
将天然埃洛石纳米管（HNTs）和还原氧化石墨烯（RGO）引入到硫（S）正极材料中，形成HNTs/S和RGO@HNTs/S复合电极，以提高锂硫电池的电化学性能。探究了酸蚀温度对HNTs形貌和孔结构的影响，并比较了经不同酸蚀温度处理后的HNTs与RGO形成的复合电极的形貌特征和电化学性能。结果表明，锂硫电池的循环稳定性和活性物质利用率得到了极大提高，这是因为HNTs的孔结构和表面极性官能团以及RGO的引入为绝缘硫颗粒提供了导电网络。在0.1 C下，经80 °C酸处理的RGO@HNTs（RGO@HNTs-80/S）复合电极的初始容量为1134 mAh g，50次循环后的放电容量比普通硫电极高20.1%，在1 C下保持556 mAh g的比放电容量。因此，RGO和HNTs可以有效提高锂硫电池的初始放电比容量、循环性能和倍率性能。
