Porous FeNi Prussian-blue sulfur hosts enhance the electrochemical performance of lithium-sulfur batteries

doi:10.19799/j.cnki.2095-4239.2024.1173

Abstract

Abstract:

In this article, porous FeNiP-NH₃ was prepared by in situ ammonia etching, and its pore structure and pore properties were controlled by adjusting the etching conditions. The pores gradually become larger as the etching time is increase4d. Utilizing porous FeNiP-NH₃ with an ammonia etching time of 60 minutes as the sulfur host material can effectively enhance the electrochemical performance of lithium-sulfur batteries. The initial-discharge specific capacities are 887.2 mAh/g, 541.7 mAh/g, 466.5 mAh/g, 402.7 mAh/g, and 318.6 mAh/g, respectively, at 0.1 C, 0.2 C, 0.5 C, 1 C, and 2 C. The specific capacity of first-cycle discharge at 0.2 ℃ can reach 632.7 mAh/g and it can still be maintained at 456.9 mAh/g after 100 cycles. This is a capacity-retention rate of 72.2%, which provides excellent cycling stability and faster REDOX reaction kinetics. The unique structural features of a porous FeNi Prussian-blue-modified sulfur anode enhances the performance of lithium-sulfur batteries. The porous structure increases the specific surface area of FeNi Prussian blue and exposes a large number of active FeNi metal sites, which can effectively capture lithium polysulfide and inhibit the shuttle effect. The open porous structure not only alleviates the volume expansion of sulfur but also facilitates the penetration by the electrolyte, which provides a convenient path for the diffusion of lithium ions and improves their diffusion rate.

Key words: porous FeNi Prussian blue, sulfur host, shuttle effect, lithium-sulfur batteries

CLC Number:

TM 912

Dan WEI, Yulong ZHANG, Xiaojuan HAN, Lixin CHEN. Porous FeNi Prussian-blue sulfur hosts enhance the electrochemical performance of lithium-sulfur batteries[J]. Energy Storage Science and Technology, 2025, 14(6): 2223-2231.

Figures/Tables 10

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