改善高负载锂硫袋装电池的反应均匀性

IF 19.5 1区 材料科学 Q1 CHEMISTRY, PHYSICAL
Carbon Energy Pub Date : 2024-08-23 DOI:10.1002/cey2.578
Hun Kim, Jae-Min Kim, Ha-Neul Choi, Kyeong-Jun Min, Shivam Kansara, Jang-Yeon Hwang, Jung Ho Kim, Hun-Gi Jung, Yang-Kook Sun
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引用次数: 0

摘要

锂硫电池(LSBs)能够实现高能量密度(400 Wh kg-1),这在市售锂离子电池中很难实现,因此受到学术界和工业界的关注。作为实际利用 LSB 的准备步骤,存在一个问题,即随着硫阴极负载水平的提高和电极面积的扩大,电池循环寿命会迅速缩短。本研究将在聚乙烯两面涂覆波姆石的隔膜(以下简称波姆石隔膜)纳入高负载锂-S 袋式电池,以抑制容量骤降,延长循环寿命。我们探讨了在高容量锂-S 袋装电池放电和充电过程中,硫阴极发生电化学反应的区域产生不平等的现象。玻镁石隔板抑制了硫阴极表面硫相关物种的积累,从而诱导了整个阴极的均匀反应,并抑制了锂金属阳极的降解,使面积容量为 8 mAh cm-2 的袋式电池能够稳定运行 300 个循环。这些结果表明了定制隔膜对于 LSB 实际应用的重要性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Improving reaction uniformity of high-loading lithium-sulfur pouch batteries

Improving reaction uniformity of high-loading lithium-sulfur pouch batteries
Lithium-sulfur batteries (LSBs) have garnered attention from both academia and industry because they can achieve high energy densities (>400 Wh kg–1), which are difficult to achieve in commercially available lithium-ion batteries. As a preparation step for practically utilizing LSBs, there is a problem, wherein battery cycle life rapidly reduces as the loading level of the sulfur cathode increases and the electrode area expands. In this study, a separator coated with boehmite on both sides of polyethylene (hereinafter denoted as boehmite separator) is incorporated into a high-loading Li-S pouch battery to suppress sudden capacity drops and achieve a longer cycle life. We explore a phenomenon by which inequality is generated in regions where an electrochemical reaction occurs in the sulfur cathode during the discharging and charging of a high-capacity Li-S pouch battery. The boehmite separator inhibits the accumulation of sulfur-related species on the surface of the sulfur cathode to induce an even reaction across the entire cathode and suppresses the degradation of the Li metal anode, allowing the pouch battery with an areal capacity of 8 mAh cm–2 to operate stably for 300 cycles. These results demonstrate the importance of customizing separators for the practical use of LSBs.
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来源期刊
Carbon Energy
Carbon Energy Multiple-
CiteScore
25.70
自引率
10.70%
发文量
116
审稿时长
4 weeks
期刊介绍: Carbon Energy is an international journal that focuses on cutting-edge energy technology involving carbon utilization and carbon emission control. It provides a platform for researchers to communicate their findings and critical opinions and aims to bring together the communities of advanced material and energy. The journal covers a broad range of energy technologies, including energy storage, photocatalysis, electrocatalysis, photoelectrocatalysis, and thermocatalysis. It covers all forms of energy, from conventional electric and thermal energy to those that catalyze chemical and biological transformations. Additionally, Carbon Energy promotes new technologies for controlling carbon emissions and the green production of carbon materials. The journal welcomes innovative interdisciplinary research with wide impact. It is indexed in various databases, including Advanced Technologies & Aerospace Collection/Database, Biological Science Collection/Database, CAS, DOAJ, Environmental Science Collection/Database, Web of Science and Technology Collection.
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