Nano silica aerogel-induced formation of an organic/alloy biphasic interfacial layer enables construction of stable high-energy lithium metal batteries
Chengwei Ma , Xinyu Zhang , Chengcai Liu , Yuanxing Zhang , Yuanshen Wang , Ling Liu , Zhikun Zhao , Borong Wu , Daobin Mu
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引用次数: 2
Abstract
Lithium metal batteries represent promising candidates for high-energy-density batteries, however, many challenges must still be overcome, e.g., interface instability and dendrite growth. In this work, nano silica aerogel was employed to generate a hybrid film with high lithium ion conductivity (0.6 mS cm−1 at room temperature) via an in situ crosslinking reaction. TOF-SIMS profile analysis has revealed conversion mechanism of hybrid film to Li–Si alloy/LiF biphasic interface layer, suggesting that the Li–Si alloy and LiF-rich interface layer promoted rapid Li+ transport and shielded the Li anodes from corrosive reactions with electrolyte-derived products. When coupled with nickel-cobalt-manganese-based cathodes, the batteries achieve outstanding capacity retention over 1000 cycles at 1 C. Additionally the developed film coated on Li enabled high coulombic efficiency (99.5%) after long-term cycling when coupled with S cathodes. Overall, the results presented herein confirm an effective strategy for the development of high-energy batteries.
锂金属电池是高能量密度电池的有前途的候选者,然而,许多挑战仍然必须克服,例如界面不稳定性和枝晶生长。在这项工作中,纳米二氧化硅气凝胶通过原位交联反应制备了具有高锂离子电导率(室温下0.6 mS cm−1)的杂化膜。TOF-SIMS剖面分析揭示了杂化膜向Li–Si合金/LiF双相界面层的转化机制,表明Li–硅合金和富LiF界面层促进了Li+的快速传输,并保护了Li阳极免受电解质衍生产物的腐蚀反应。当与镍-钴-锰基阴极耦合时,电池在1℃下1000次循环中实现了出色的容量保持。此外,在与S阴极耦合时的长期循环后,涂覆在Li上的显影膜能够实现高库仑效率(99.5%)。总的来说,本文的结果证实了开发高能电池的有效策略。
期刊介绍:
Green Energy & Environment (GEE) is an internationally recognized journal that undergoes a rigorous peer-review process. It focuses on interdisciplinary research related to green energy and the environment, covering a wide range of topics including biofuel and bioenergy, energy storage and networks, catalysis for sustainable processes, and materials for energy and the environment. GEE has a broad scope and encourages the submission of original and innovative research in both fundamental and engineering fields. Additionally, GEE serves as a platform for discussions, summaries, reviews, and previews of the impact of green energy on the eco-environment.