Lixue Yang
(, ), Zhiyuan Han
(, ), Chen Zhang
(, ), Yun Cao
(, ), Wei Lv
(, )
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引用次数: 0
Abstract
Lithium-sulfur (Li-S) batteries face significant challenges due to the environmental sensitivity, dendrite growth and polysulfide-induced side reactions of lithium metal anodes (LMAs), which compromise their safety and cycle life. To address these issues, we develop a composite protective layer comprising layer-by-layer assembled graphene oxide (GO) films coated with 1H,1H,2H,2H-perfluorodecyl trichlorosilane (FDTS). The lithium-reduced GO framework establishes uniform ion-conducting channels that homogenize Li-ion flux, enabling uniform deposition and suppressing dendrite formation. At the same time, the hydrophobic organic coating serves as a robust barrier against water, air and lithium polysulfides (LiPSs), enabling the environmental and electrochemical stability of LMAs. As a result, the protected LMAs maintain exceptional stability upon direct contact with water and exposure in humid air (relative humidity 35%). When integrated into Li-S batteries with high sulfur loadings (4.5 mg cm−2), the protected LMAs enable a capacity retention of 61.1% over 300 cycles, showing improved cycling performance. This work provides a scalable approach to stabilizing LMAs for practical Li-S batteries.
锂硫电池由于环境敏感性、枝晶生长和锂金属阳极(lma)的多硫化物引起的副反应而面临重大挑战,影响了其安全性和循环寿命。为了解决这些问题,我们开发了一种复合保护层,由一层一层组装的氧化石墨烯(GO)薄膜组成,涂有1H,1H,2H,2H-全氟癸基三氯硅烷(FDTS)。锂还原氧化石墨烯框架建立了均匀的离子传导通道,使锂离子通量均匀,从而实现均匀沉积并抑制枝晶的形成。同时,疏水有机涂层可作为水、空气和多硫化锂(LiPSs)的坚固屏障,使LMAs具有环境和电化学稳定性。因此,受保护的lma在与水直接接触和暴露在潮湿空气中(相对湿度35%)时保持卓越的稳定性。当集成到高硫负载(4.5 mg cm - 2)的Li-S电池中时,受保护的lma在300次循环中能够保持61.1%的容量,显示出更好的循环性能。这项工作提供了一种可扩展的方法来稳定实用锂电池的lma。
期刊介绍:
Science China Materials (SCM) is a globally peer-reviewed journal that covers all facets of materials science. It is supervised by the Chinese Academy of Sciences and co-sponsored by the Chinese Academy of Sciences and the National Natural Science Foundation of China. The journal is jointly published monthly in both printed and electronic forms by Science China Press and Springer. The aim of SCM is to encourage communication of high-quality, innovative research results at the cutting-edge interface of materials science with chemistry, physics, biology, and engineering. It focuses on breakthroughs from around the world and aims to become a world-leading academic journal for materials science.