二维蒙脱土-碳纳米管交联多孔网络中间层对多硫化物穿梭的抑制作用

ZHOU Ming-xia; ZHOU Wen-hua; LONG Xiang; ZHU Shao-kuan; Xu Peng; OUYANG Quan-sheng; SHI Bin; SHAO Jiao-jing

doi:10.1016/S1872-5805(23)60783-8

二维蒙脱土-碳纳米管交联多孔网络中间层对多硫化物穿梭的抑制作用

doi: 10.1016/S1872-5805(23)60783-8

1.
贵州大学材料与冶金学院，贵州贵阳 550025
2.
贵州省轻工职业技术学院先进电池与材料工程研究中心，贵州贵阳 550025
3.
特种化学电源国家重点实验室，贵州遵义 563003

基金项目: 国家自然科学基金（51972070、52372185和52062004）；贵州省高层次创新型人才（黔科合平台人才-GCC[2022]013-1）；贵州省教育厅高校科技创新团队（黔教技[2023]054号）；贵州省科技计划项目（黔科合基础[2020]1Z042；黔科合支撑[2021]一般317）和贵州大学培育项目（贵大培育[2019]01号）

详细信息

通讯作者:
邵姣婧，博士，教授. E-mail：xjshao@gzu.edu.cn

中图分类号: TB332；TM53
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- 被引次数: 0
出版历程
- 收稿日期: 2023-05-21
- 修回日期: 2023-09-23
- 网络出版日期: 2023-10-20
- 刊出日期: 2023-11-23

A 2D montmorillonite-carbon nanotube interconnected porous network that prevents polysulfide shuttling

1.
School of Materials and Metallurgy, Guizhou University, Guiyang 550025, China
2.
Advanced Batteries and Materials Engineering Research Center, Guizhou Light Industry Technical College, Guiyang 550025, China
3.
State Key Laboratory of Advanced Chemical Power Sources, Zunyi 563003, China

Funds: This work was supported by National Natural Science Foundation of China (51972070, 52372185 and 52062004), Guizhou Provincial High Level Innovative Talents Project (QKHPTRC-GCC[2022]013-1), Innovation Team for Advanced Electrochemical Energy Storage Devices and Key Materials of Guizhou Provincial Higher Education Institutions (QianJiaoJi[2023]054), Guizhou Provincial Science and Technology Projects (QKHJC[2020]1Z042, QKHZC[2021]YB317) and Cultivation Project of Guizhou University (GDPY[2019]01)

More Information

Author Bio:
^†周明霞与^†周文华为共同第一作者

Corresponding author: SHAO Jiao-jing, Ph.D, Professor. E-mail：xjshao@gzu.edu.cn

摘要

摘要: 将一维碳纳米管（CNT）和二维蒙脱土（MMT）纳米片复合并用于修饰商用聚丙烯（PP）隔膜。得益于碳纳米管的高电子导电性，以及MMT对多硫化物（LiPS）的强吸附能力和低的锂离子传输势垒，所得的交联多孔CNT-MMT复合阻挡层具有优异的结构稳定性和高的锂离子传输能力，表现出抑制LiPS穿梭的性能，因此实现了高硫利用率。结果表明，该复合阻挡层修饰的PP隔膜有效提升了锂硫电池的锂离子扩散系数、放电比容量和循环稳定性。所组装锂硫电池的0.1 C初始放电比容量为1373 mAh g⁻¹，且具有良好的循环稳定性，在1 C下经500次循环后其每圈容量衰减率仅为0.062%。
- 锂硫电池 /
- 多硫穿梭 /
- 二维蒙脱土 /
- 碳纳米管 /
- 阻挡层
Abstract: A commercial polypropylene (PP) separator was modified by a one-dimensional carbon nanotube (CNT) and two-dimensional montmorillonite (MMT) hybrid material (CNT-MMT). Because of the high electron conductivity of the CNTs, and the strong polysulfide (LiPS) adsorption ability and easy lithium ion transport through MMT, the interconnected porous CNT-MMT interlayer with excellent structural integrity strongly suppresses LiPS shuttling while maintaining high lithium-ion transport, producing a high utilization of the active sulfur. Lithium-sulfur batteries assembled with this interlayer have a high lithium-ion diffusion coefficient, a high discharge capacity and stable cycling performance. They had an initial specific capacity of 1373 mAh g⁻¹ at 0.1 C, and a stable cycling performance with a low decay rate of 0.062% per cycle at 1 C after 500 cycles.
- Lithium-sulfur batteries /
- Polysulfide shuttling /
- Two-dimensional montmorillonite /
- Carbon nanotube /
- Interlayer introduction

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FIG. 2779. FIG. 2779.

FIG. 2779.. FIG. 2779.

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Figure 1. Characterization of 2D MMT. (a) AFM image and the corresponding height profile (inset), (b) SEM image and (c) SAED pattern of the MMT nanosheets. (d) XRD patterns and (e) FTIR spectra of the 2D MMT nanosheets and MMT lamellar crystals. (f) Zeta potential plot of the aqueous suspensions containing 2D MMT

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Figure 2. (a) Photos of different samples soaked in a Li₂S₆/DOL/DME solution with different time, (b) O 1s spectra and (c) Li 1s XPS spectra of MMT before and after absorbing Li₂S₆. (d-f) Nucleation of the Li₂S measurements of the cells based on various electrodes. (g) Potentiostatic charge profiles of the cells with MMT, CNT and CNT-MMT electrode. (h) Cross-section SEM image and (i) EDS mapping of the MMT-CNT

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Figure 3. (a-d) SEM images of PP, PP-MMT, PP-CNT and PP-CNT-MMT. (e-h) The electrolyte contact angles on various separators. (i) High magnification SEM image of PP-CNT-MMT. (j) Digital photos of PP-CNT and PP-CNT-MMT before and after folding

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Figure 4. (a-d) CV curves of the batteries with different separators at the scan rates of 0.1, 0.2, 0.3 and 0.4 mV s⁻¹. (e) Lithium ion diffusion coefficient (D_Li+) of the cells with PP, PP-MMT, PP-CNT and PP-CNT-MMT

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Figure 5. (a) Nyquist plots, (b) galvanostatic charge/discharge profiles at 0.1 C and (c) rate performance of the Li-S battery with PP-CNT-MMT, PP-CNT, PP-MMT and PP, respectively. (d) CV curves for the 1^st, 2^nd and 3^rd cycles of the cell with PP-CNT- MMT at a sweep rate of 0.1 mV s⁻¹

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Figure 6. The cycle performance of the batteries with PP-CNT-MMT, PP-MMT, PP-CNT and PP at (a) 0.2 C and (b) 0.5 C with sulfur loading of 1.0 mg cm⁻². (c) The long-term cycling performance of these batteries at 1 C

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