Crystalline/amorphous heterostructure CoNi/MoO3-x as an bidirectional catalyst for polysulfide reaction to enable high‑sulfur-loading lithium‑sulfur battery

IF 8.6 2区工程技术 Q1 ENERGY & FUELS

Sustainable Materials and Technologies Pub Date : 2025-02-18 DOI:10.1016/j.susmat.2025.e01307

Yvjie Lv , Qingmei Su , Kai Zhang , Xingxing Zhang , Weihao Shi , Siyao Wang , Fang Zhang , Wenqi Zhao , Miao Zhang , Shukai Ding , Gaohui Du , Bingshe Xu

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引用次数: 0

Abstract

Lithium‑sulfur batteries (LSBs) are a very promising next-generation battery due to their high theoretical specific capacity and specific energy. However, the commercialization process is impeded by high‑sulfur-loading cathodes due to the low conductivity of sulfur, the slow redox kinetics and the shuttle effect of soluble polysulfides. Herein, an amorphous MoO_3-x floral nanosheet structure embedded with CoNi alloy particles on carbon cloth (CoNi/MoO_3-x@CC) was developed as a interlayer to achieve fast redox reaction kinetics in LSBs. The 3D-supported conductive network structure architecture of the carbon cloth provides channels for the rapid electron and ion transfer. It was confirmed that the strong chemisorption and catalytic conversion for LiPSs were produced by the the synergistic effect of CoNi alloy and amorphous MoO_3-x. The LSBs assembled with CoNi/MoO_3-x@CC interlayer exhibit improved rate performance (reversible specific capacity of 525 mAh g⁻¹ at 2C) and outstanding cycling stability (capacity decay rate of 0.071 % after 500 cycles at 1C). Furthermore, the CoNi/MoO_3-x@CC interlayer was created for LSBs with high sulfur loading. After 50 cycles at 0.2C, the LSBs with higher sulfur loadings of 8.07 and 8.92 mg cm⁻² provide high reversible capacity of 1060 and 980 mAh g⁻¹, respectively.

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锂硫电池（LSB）具有很高的理论比容量和比能量，是一种非常有前途的下一代电池。然而，由于硫的低电导率、缓慢的氧化还原动力学以及可溶性多硫化物的穿梭效应，高载硫阴极阻碍了其商业化进程。在此，我们开发了一种在碳布上嵌入 CoNi 合金颗粒的无定形 MoO3-x 花状纳米片结构（CoNi/MoO3-x@CC）作为中间层，以实现 LSBs 的快速氧化还原反应动力学。碳布的三维支撑导电网络结构为电子和离子的快速转移提供了通道。研究证实，钴硝合金和非晶态 MoO3-x 的协同作用产生了对锂离子电池的强化学吸附和催化转化。使用 CoNi/MoO3-x@CC 夹层组装的 LSBs 表现出更高的速率性能（2℃ 时的可逆比容量为 525 mAh g-1）和出色的循环稳定性（1℃ 循环 500 次后的容量衰减率为 0.071%）。此外，CoNi/MoO3-x@CC 中间膜还适用于高硫含量的 LSB。在 0.2C 下循环 50 次后，硫含量分别为 8.07 和 8.92 mg cm-2 的 LSB 可提供 1060 和 980 mAh g-1 的高可逆容量。

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来源期刊

Sustainable Materials and Technologies Energy-Renewable Energy, Sustainability and the Environment

CiteScore

13.40

自引率

4.20%

发文量

158

审稿时长

45 days

期刊介绍： Sustainable Materials and Technologies (SM&T), an international, cross-disciplinary, fully open access journal published by Elsevier, focuses on original full-length research articles and reviews. It covers applied or fundamental science of nano-, micro-, meso-, and macro-scale aspects of materials and technologies for sustainable development. SM&T gives special attention to contributions that bridge the knowledge gap between materials and system designs.