分离器(采油)
电化学
材料科学
化学工程
涂层
电催化剂
碳纳米管
密度泛函理论
动力学
化学吸附
电化学动力学
电极
纳米技术
吸附
化学
有机化学
物理化学
计算化学
工程类
物理
热力学
量子力学
作者
Yinze Zuo,Yuejin Zhu,Ruchao Wan,Weiming Su,Yining Fan,Ruiping Liu,Yuefeng Tang,Yanfeng Chen
标识
DOI:10.1016/j.cej.2021.129053
摘要
The preparation of functional separator has become an effective strategy to enhance the electrochemical performance of lithium-sulfur batteries (LSBs). Therefore, a functional separator suitable for LSBs has aroused great interest. In this work, we report a novel functional separator using LiVPO4F together with carbon nanotube (LVPF/CNT) as functional coating. The LVPF/CNT modified separator not only acts as a conductive layer to facilitate electron and lithium ion (Li+) transport, but also provides chemisorption for lithium polysulfides (LiPSs) and improves the electrochemical kinetics of LSBs. Thus, the cell with LVPF/CNT modified separator delivers an excellent cycle life with the capacity of 578.5 mAh g−1 after 1000 cycles at 1.5C. An ultra-long cycle life (551 mAh g−1 after 350 cycles at 0.5C) and a high areal capacity of 5.58 mAh cm−2 are obtained at a high sulfur loading of 7 mg cm−2. Moreover, the visualized transformation of the LiPSs in the tailor-made cell is also revealed by in situ XRD, while the density functional theory (DFT) simulated the principle of the interaction between the LVPF and LiPSs. This work provides a promising and insightful research to develop the progressive LSBs with functional separator.
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