Facilitation polysulfides adsorption/catalysis by nitrogen/phosphorous co-doped carbon nanofibers networks for advanced lithium/polysulfides batteries

Yao, Shanshan; Zhang, Xiaoning; Zhang, Cuijuan; Liu, Hongtao; Zhang, Tianjie; Shang, Junpeng; Zhang, Wenwen; Ma, Chao; Wang, Yiqiong; Wang, Rongrong; Deng, Yuge; Xiang, Jun; Shen, Xiangqian

doi:10.1016/j.diamond.2023.110730

Cited by 9 publications

(1 citation statement)

References 60 publications

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“…Figure b shows the high-resolution N 1s XPS spectrum, and it can be found that the peak intensity of the pyrrolic-N group decreases significantly due to the adsorption of polysulfides. , In the high-resolution S 2p XPS spectrum (Figure c), there are typically several peaks at 169.1, 167.5, 164.5, and 162.3 eV, corresponding to polysulfide oxidation, Li 2 SO 3 produced by the electrolyte, sulfur, and lithium sulfide (Li 2 S), respectively. − Figure d,e shows the high-resolution XPS spectra of Co 2p and Fe 2p, and the characteristic peaks correspond to the CoFe alloy, respectively. However, the binding energies of multivalence states of Co and Fe shift to a lower binding energy after cycling, which is attributed to the chemisorption of polysulfide species by the CoFe nanoalloy particles. − …”

Section: Results and Discussionmentioning

confidence: 99%

Separator Modified by Carbon-Encapsulated CoFe Alloy Nanoparticles Supported on Carbon Nanotubes for Advanced Lithium–Sulfur Batteries

Shang,

Ma,

Zhang

et al. 2024

ACS Appl. Nano Mater.

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The commercialization of lithium−sulfur (Li−S) batteries still confronts great challenges due to the sluggish redox kinetics of sulfur and the shuttle effect of lithium polysulfides. Designing a highly active electrocatalyst is an effective strategy to address the problems caused by complex multistep reactions. Herein, a hybrid composite composed of nitrogen-doped carbonwrapped bimetallic cobalt−iron alloy nanoparticles (NC@CoFe) is derived from a Prussian blue analogue and multiwalled carbon nanotubes (CNTs), which is used as a functional coating on a separator for Li−S batteries. The cross-linked CNTs provide a robust and conductive network for quick charge transfer and sufficient active-site exposure, and the NC@CoFe nanoparticles demonstrate a strong ability for anchoring and catalytic conversion of lithium polysulfides. The specific discharge capacity of the cell with the NC@CoFe/CNT-modified separator can reach 865.4 mA h/g at 3.18 mA/cm 2 (0.5 C) and is 576.3 mA h/g after 300 cycles with a Coulombic efficiency of approximately 98.2%. The cells with a 7.4 mg/cm 2 sulfur loading display a remarkable capacity retention of 77.8% after 100 cycles. The electrocatalyst with functionalized carbonaceous adsorption and alloy nanoparticle catalysis holds substantial promise for advancing the commercialization of durable Li−S batteries.

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