Smart functional binders empowering lithium-sulfur cathodes with enhanced atmospheric stability and catalytic kinetics.

IF 12.2 2区 材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY
Shengrui Cui, Ning Wang, Yanyun Zhang, Minghui Zhang, Youjun Xing, Tiancheng Wang, Weiya Li, Wei Liu, Seung-Taek Myung, Yongcheng Jin
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Abstract

Although lithium-sulfur (Li-S) batteries have attracted considerable research attention, several critical barriers must be overcome to bridge the gap between laboratory-scale achievements and practical commercial applications. For example, the notorious polysulfide shuttle effect, severe electrode volume changes, and challenging solid-liquid-solid conversion reactions. In this study, we have developed a multifunctional binder by incorporating cobalt(II) phthalocyanine (CoPc) into conventional poly(vinylidene fluoride) (PVDF) at a relatively lower processing temperature, which induces the phase transformation of α-PVDF to β-PVDF, thereby constructing an enhanced localized electric field with three advantages: (1) superior adsorption capabilities and catalytic activity, (2) robust mechanical properties that accommodate substantial volume fluctuations during cycling, and (3) excellent hydrophobic properties allowing for long-term storage in air. As a result, the batteries composed of an optimized PC-10 binder (CoPc added at 10%) maintain a specific capacity of 706 mA h g-1 after 500 cycles at 0.5C, 399 mA h g-1 at 2C after 1000 cycles with a decay rate of only 0.049% per cycle, and 80.5% capacity retention even under high sulfur loading (5 mg cm-2). Moreover, the batteries maintained excellent discharge capacity with 1024 and 845 mA h g-1 discharge specific capacities at 0.5C and 1C, respectively, even when the cathode with the PC-10 binder has been exposed to air for 20 days. This strategy has successfully established a multifunctional binder through a simple and feasible approach, offering new insights into addressing the inherent challenges of Li-S batteries.

智能功能粘合剂使锂硫阴极具有增强的大气稳定性和催化动力学。
虽然锂硫(li -硫)电池已经引起了相当多的研究关注,但要弥合实验室规模的成就和实际商业应用之间的差距,还必须克服几个关键的障碍。例如,臭名昭著的多硫化物穿梭效应,严重的电极体积变化,以及具有挑战性的固-液-固转化反应。在本研究中,我们在较低的加工温度下将钴(II)酞菁(CoPc)加入到传统的聚偏氟乙烯(PVDF)中,开发了一种多功能粘合剂,诱导α-PVDF向β-PVDF相变,从而构建了一个增强的局域电场,具有三个优点:(1)优越的吸附能力和催化活性;(2)坚固的机械性能,可适应循环过程中大量的体积波动;(3)优异的疏水性,可在空气中长期储存。结果表明,经优化的PC-10粘结剂(CoPc添加量为10%)组成的电池在0.5℃下循环500次后的比容量为706 mA h g-1,在2C下循环1000次后的比容量为399 mA h g-1,每循环衰减率仅为0.049%,即使在高硫负载(5 mg cm-2)下的容量保持率为80.5%。此外,即使PC-10粘合剂的阴极暴露在空气中20天,电池在0.5C和1C下的放电比容量分别为1024和845 mA h g-1,仍然保持优异的放电容量。该策略通过简单可行的方法成功建立了多功能粘结剂,为解决Li-S电池的固有挑战提供了新的见解。
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
Materials Horizons
Materials Horizons CHEMISTRY, MULTIDISCIPLINARY-MATERIALS SCIENCE, MULTIDISCIPLINARY
CiteScore
18.90
自引率
2.30%
发文量
306
审稿时长
1.3 months
期刊介绍: Materials Horizons is a leading journal in materials science that focuses on publishing exceptionally high-quality and innovative research. The journal prioritizes original research that introduces new concepts or ways of thinking, rather than solely reporting technological advancements. However, groundbreaking articles featuring record-breaking material performance may also be published. To be considered for publication, the work must be of significant interest to our community-spanning readership. Starting from 2021, all articles published in Materials Horizons will be indexed in MEDLINE©. The journal publishes various types of articles, including Communications, Reviews, Opinion pieces, Focus articles, and Comments. It serves as a core journal for researchers from academia, government, and industry across all areas of materials research. Materials Horizons is a Transformative Journal and compliant with Plan S. It has an impact factor of 13.3 and is indexed in MEDLINE.
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