Facile Generation of Polymer-Alloy Hybrid Layers for Dendrite-Free Lithium-Metal Anodes with Improved Moisture Stability
Facile Generation of Polymer-Alloy Hybrid Layers for Dendrite-Free Lithium-Metal Anodes with Improved Moisture Stability
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DOI：
10.1002/anie.201905712
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发表时间：
2019-08-12
影响因子：
16.6
通讯作者：
Xie, Jia
中科院分区：
文献类型：
--
作者：
Jiang, Zhipeng;Jin, Liu;Xie, Jia
锂金属阳极被认为是最有前途的下一代高储能电池阳极。然而，锂枝晶会导致锂-金属电池(LMB)不可逆的容量衰减。此外，LMBs严格的装配环境条件也是实际应用的一个挑战。本研究通过一种简单的化学改性策略，设计并制备了一种具有人工杂化层的锂金属负极，该负极由聚合物和合金组成。经处理的锂阳极在Li-Li对称电池中保持了1000h以上的无枝晶状态，并在高面积负载的Li-S和Li-LiFePO_4充满电池中表现出优异的循环性能。此外，由于聚合物的疏水性，处理后的锂表现出更好的湿气稳定性，从而在潮湿的空气中保持良好的电化学性能。
Lithium-metal anodes are recognized as the most promising next-generation anodes for high-energy-storage batteries. However, lithium dendrites lead to irreversible capacity decay in lithium-metal batteries (LMBs). Besides, the strict assembly-environment conditions of LMBs are regarded as a challenge for practical applications. In this study, a workable lithium-metal anode with an artificial hybrid layer composed of a polymer and an alloy was designed and prepared by a simple chemical-modification strategy. Treated lithium anodes remained dendrite-free for over 1000 h in a Li-Li symmetric cell and exhibited outstanding cycle performance in high-areal-loading Li-S and Li-LiFePO4 full cells. Moreover, the treated lithium showed improved moisture stability that benefits from the hydrophobicity of the polymer, thus retaining good electrochemical performance after exposure to humid air.