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Waterproof lithium metal anode enabled by cross-linking encapsulation
Science Bulletin ( IF 18.9 ) Pub Date : 2020-02-26 , DOI: 10.1016/j.scib.2020.02.022
Ye Xiao , Rui Xu , Chong Yan , Yeru Liang , Jun-Fan Ding , Jia-Qi Huang

Lithium (Li) metal is considered as the ultimate anode choice for developing next-generation high-energy batteries. However, the poor tolerance against moist air and the unstable solid electrolyte interphases (SEI) induced by the intrinsic high reactivity of lithium bring series of obstacles such as the rigorous operating condition, the poor electrochemical performance, and safety anxiety of the cell, which to a large extent hinder the commercial utilization of Li metal anode. Here, an effective encapsulation strategy was reported via a facile drop-casting and a following heat-assisted cross-linking process. Benefiting from the inherent hydrophobicity and the compact micro-structure of the cross-linked poly(vinylidene-co-hexafluoropropylene) (PVDF–HFP), the as-encapsulated Li metal exhibited prominent stability toward moisture, as well corroborated by the evaluations both under the humid air at 25 °C with 30% relative humidity (RH) and pure water. Moreover, the encapsulated Li metal anode exhibits a decent electrochemical performance without substantially increasing the cell polarization due to the uniform and unblocked ion channels, which originally comes from the superior affinity of the PVDF–HFP polymer toward non-aqueous electrolyte. This work demonstrates a novel and valid encapsulation strategy for humidity-sensitive alkali metal electrodes, aiming to pave the way for the large-scale and low-cost deployment of the alkali metal-based high-energy-density batteries.



中文翻译:

通过交联封装实现防水锂金属阳极

锂(Li)金属被认为是开发下一代高能电池的最终阳极选择。然而,由于锂固有的高反应性而导致的对潮湿空气的耐受性差以及不稳定的固体电解质中间相(SEI)带来了一系列障碍,例如严苛的操作条件,不良的电化学性能以及电池的安全性焦虑。在很大程度上阻碍了锂金属阳极的商业应用。在这里,通过简便的滴铸法和随后的热辅助交联过程,报告了一种有效的封装策略。得益于交联的聚偏二氟乙烯-共-六氟丙烯(PVDF-HFP)固有的疏水性和致密的微观结构,这种封装后的锂金属对水分表现出显着的稳定性,在25°C的潮湿空气中,相对湿度(RH)为30%的情况下,以及纯净水的评估结果也得到了证实。而且,由于锂离子通道的均匀和无阻塞,被封装的锂金属阳极表现出良好的电化学性能,而不会显着增加电池极化,这最初是由于PVDF-HFP聚合物对非水电解质的优越亲和力所致。这项工作展示了一种对湿气敏感的碱金属电极的新颖有效的封装策略,旨在为基于碱金属的高能量密度电池的大规模低成本部署铺平道路。封装的锂金属阳极表现出良好的电化学性能,并且由于均匀而不受阻碍的离子通道而不会显着增加电池极化,这最初来自于PVDF-HFP聚合物对非水电解质的优异亲和力。这项工作展示了一种对湿气敏感的碱金属电极的新颖有效的封装策略,旨在为基于碱金属的高能量密度电池的大规模低成本部署铺平道路。封装的锂金属阳极表现出良好的电化学性能,并且由于均匀而不受阻碍的离子通道而不会显着增加电池极化,这最初来自于PVDF-HFP聚合物对非水电解质的优异亲和力。这项工作展示了一种对湿气敏感的碱金属电极的新颖有效的封装策略,旨在为基于碱金属的高能量密度电池的大规模低成本部署铺平道路。

更新日期:2020-02-26
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