多硫化物
阳极
材料科学
化学工程
锂(药物)
溶解
阴极保护
纳米纤维
氧化还原
储能
多孔性
碳纤维
扩散
纳米技术
无机化学
电极
化学
电解质
复合材料
复合数
冶金
内分泌学
工程类
物理化学
功率(物理)
物理
热力学
医学
量子力学
作者
Gang Wang,Feng Yang,Junyan Chen,Jingge Ju,Shuping Zhang,Yue Zhao,Bowen Cheng,Jie Fan,Lei Li,Nanping Deng,Weimin Kang
标识
DOI:10.1016/j.jallcom.2021.160073
摘要
Lithium-sulfur (Li-S) battery as a promising energy storage technology has attracted extensive concern. However, their practical performance is seriously limited by the dissolution and diffusion of long-chain polysulfides. In this study, a multifunctional cathodic interlayer was constructed, which composed by Mg-Al layered double hydroxides (MALDHs) modified N-doped honeycomb-like porous carbon nanofibers (NPCNFs). The NPCNFs in the prepared interlayer can combine the physical confinement of the porous structure and the chemical role of the nitrogen atoms to suppress the dissolved lithium polysulfide (LiPS). Furthermore, highly conductive interlayer contains NPCNFs can be regarded as a second current collector, and the hierarchical pores is beneficial to adapt the volume change during the redox process. More importantly, the obtained polar MALDHs not only can strongly interact with LiPS by chemical combination, but also enhance the redox kinetics by forming cooperative interface. As a result, the Li-S cells with the cathodic interlayers obtains a high initial discharge capacity of 1452 mAh g−1 at 0.2 C, superior rate capability up to 2 C rate with a capacity of 952 mAh g−1 and excellent long-term cycling stability by maintaining a low average capacity fading (0.065% per cycle) during 500 cycles at 1 C. Therefore, the interlayer contains [email protected] has extraordinary potential to be used in high-performance Li-S batteries.
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