Design towards recyclable micron-sized Na₂S cathode with self-refinement mechanism.

IF 14.7 1区综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES

Nature Communications Pub Date : 2024-11-19 DOI:10.1038/s41467-024-54316-9

Suwan Lu, Yang Liu, Jingjing Xu, Shixiao Weng, Jiangyan Xue, Lingwang Liu, Zhicheng Wang, Can Qian, Guochao Sun, Yiwen Gao, Qingyu Dong, Hong Li, Xiaodong Wu

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Abstract

Sodium sulfide (Na₂S) as an initial cathode material in room-temperature sodium-sulfur batteries is conducive to get rid of the dependence on Na-metal anode. However, the micron-sized Na₂S that accords with the practical requirements is obstructed due to poor kinetics and severe shuttle effect. Herein, a subtle strategy is proposed via regulating Na₂S redeposition behaviours. By the synergistic effect from both conductive structure and cuprous sulfide (Cu₂S) catalysis, the micron-sized Na₂S particles are broken down and redeposited to nano-size during the initial cycle which can be fully utilized in subsequent cycles. Consequently, the Na₂S/CPVP@Cu₂S||Na cell delivers excellent cyclability (670 mAh g_S^-1 after 500 cycles) with a remarkable average Coulombic efficiency over 99.7% and rate capability (480 mAh g_S^-1 at 4 A g_S^-1). Besides, the Na-free anodes are used to prove the application prospects. This work provides an innovative idea for utilizing micron-sized Na₂S and offers insights into its conversion pathway.

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设计具有自精炼机制的可回收微米级 Na2S 阴极。

硫化钠（Na2S）作为常温钠硫电池的初始阴极材料，有利于摆脱对钠金属阳极的依赖。然而，符合实际要求的微米级 Na2S 却因动力学性能差和严重的穿梭效应而受阻。在此，我们提出了一种通过调节 Na2S 再沉积行为的微妙策略。在导电结构和硫化亚铜（Cu2S）催化作用的协同作用下，微米级的 Na2S 颗粒在初始循环中被分解并重新沉积为纳米级，并在后续循环中得到充分利用。因此，Na2S/CPVP@Cu2S||Na 电池具有出色的循环能力（500 次循环后为 670 mAh gS-1），平均库仑效率超过 99.7%，速率能力（4 A gS-1 时为 480 mAh gS-1）也十分突出。此外，还使用了不含 Na 的阳极来证明其应用前景。这项工作为利用微米级 Na2S 提供了一个创新思路，并为其转化途径提供了深入见解。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Nature Communications Biological Science Disciplines-

CiteScore

24.90

自引率

2.40%

发文量

6928

审稿时长

3.7 months

期刊介绍： Nature Communications, an open-access journal, publishes high-quality research spanning all areas of the natural sciences. Papers featured in the journal showcase significant advances relevant to specialists in each respective field. With a 2-year impact factor of 16.6 (2022) and a median time of 8 days from submission to the first editorial decision, Nature Communications is committed to rapid dissemination of research findings. As a multidisciplinary journal, it welcomes contributions from biological, health, physical, chemical, Earth, social, mathematical, applied, and engineering sciences, aiming to highlight important breakthroughs within each domain.