FeP Nanocrystal Catalyzed Activation of Li2S for Establishment of Ultra-Stable Li-S Batteries

doi:10.19894/j.issn.1000-0518.240303

Chinese Journal of Applied Chemistry ›› 2025, Vol. 42 ›› Issue (5): 668-674.DOI: 10.19894/j.issn.1000-0518.240303

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FeP Nanocrystal Catalyzed Activation of Li₂S for Establishment of Ultra-Stable Li-S Batteries

Fei CHEN(), Fei-Fei ZHAI, Hao-Xin SONG, Pan LYU

CHN Energy I&C Interconnection Technology Co. ，Ltd. ，Beijing 102200，China

Received:2024-09-24 Accepted:2025-02-08 Published:2025-05-01 Online:2025-06-05
Contact: Fei CHEN
About author:cfm6889@163.com

Abstract

Abstract:

Through a simple and easily scalable high-temperature in-situ pyrolysis of polymers， a self-supported core-shell structured flexible porous catalytic carrier is prepared for high-loading of active sulfur components. Introducing FeP nanocrystals within the shell layer accelerates the ion transport within the sulfur electrode structure and efficiently catalyzes the activation conversion of Li₂S， accelerating the conversion reaction of Li₂S?S₈ in Li-S batteries， ensuring high reversibility and long-term cycling stability of Li-S batteries. The prepared high-sulfur-loaded cathode exhibits high discharge specific capacity （1306.2 mA·h/g） and excellent long-term cycling stability （2 C→0.1 C， 95.8% of capacity recovery rate）. Battery disassembly analysis after cycling confirms the performance degradation mechanism of the assembled lithium-sulfur batteries under the experimental conditions.

Key words: Li-S batteries, FeP nanocrystal, Core-shell structure, Li₂S activation, Porous matrix

CLC Number:

O646

Fei CHEN, Fei-Fei ZHAI, Hao-Xin SONG, Pan LYU. FeP Nanocrystal Catalyzed Activation of Li₂S for Establishment of Ultra-Stable Li-S Batteries[J]. Chinese Journal of Applied Chemistry, 2025, 42(5): 668-674.

Figures/Tables 4

Fig.1 （A， B） TEM images of FeP@PCC core-shell composite materials at different magnifications； SEM images of （C） FeP@PCC and （D） S/FeP@PCC；（E） HAADF and Mapping elemental images of FeP@PCC loaded with sulfur

Fig.2 XRD pattern （A） and high-resolution XPS spectra of Fe2p （B） and P2p （C） for FeP@PCC composite material；（D） TGA curve of S/FeP@PCC composite material；（E） BET surface area and pore distribution curves of as-prepared samples；（F） XRD patterns of FeP@PCC and FeP@PCC mixed with Sulfur Powder

Fig.3 （A， B） Charge-discharge curves，（C） cyclic voltammetry profile of sulfur cathode and （D） rate performance of different composite materials at 0.1 C

Fig.4 Long-term cycling performance degradation mechanism of lithium-sulfur batteries

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FeP Nanocrystal Catalyzed Activation of Li₂S for Establishment of Ultra-Stable Li-S Batteries

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