多孔铁镍普鲁士蓝改性硫正极增强锂硫电池性能

doi:10.19799/j.cnki.2095-4239.2024.1173

摘要/Abstract

摘要：

本工作采用原位氨水刻蚀制备多孔铁镍普鲁士蓝(FeNiP-NH₃)，通过调节刻蚀条件控制铁镍普鲁士蓝的孔结构与孔性能。随着刻蚀时间的延长，孔洞逐渐变大。当氨水刻蚀时间为60 min时，多孔FeNiP-NH₃作为硫宿主材料能够有效增强锂硫电池的电化学性能，在0.1 C、0.2 C、0.5 C、1 C和2 C下的初始放电比容量分别为887.2 mAh/g、541.7 mAh/g、466.5 mAh/g、402.7 mAh/g、318.6 mAh/g。在0.2 C长循环中，初始放电比容量为632.7 mAh/g，循环至100圈时放电比容量维持在456.9 mAh/g，容量保持率为72.2%，表明其具有良好的循环稳定性和更快的氧化还原反应动力学。多孔铁镍普鲁士蓝改性硫正极增强锂硫电池性能得益于独特的结构特征，多孔结构增加了铁镍普鲁士蓝的比表面积，暴露大量铁镍金属活性位点能够与多硫化物相结合实现吸附作用，从而有效捕获多硫化锂，抑制穿梭效应；开放的多孔结构不仅能够缓解硫的嵌入和缓解循环过程产生的体积膨胀问题，从而延长电极的循环寿命和稳定性，而且有利于电解液的渗透，为锂离子的扩散提供了便捷的路径，有利于离子的扩散和传输。

关键词: 多孔铁镍普鲁士蓝, 硫宿主, 穿梭效应, 锂硫电池

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

中图分类号:

TM 912

卫丹, 张玉龙, 韩小娟, 陈立新. 多孔铁镍普鲁士蓝改性硫正极增强锂硫电池性能[J]. 储能科学与技术, 2025, 14(6): 2223-2231.

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.

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