Air-Stable Lithium Spheres Produced by Electrochemical Plating.
Air-Stable Lithium Spheres Produced by Electrochemical Plating.
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DOI：
10.1002/anie.201807355
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发表时间：
2018-08
影响因子：
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通讯作者：
Ting-ting Yang;P. Jia;Qiunan Liu;Liqiang Zhang;C. Du;Jingzhao Chen;Hongjun Ye;Xiaomei Li;
中科院分区：
文献类型：
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作者：
Ting-ting Yang;P. Jia;Qiunan Liu;Liqiang Zhang;C. Du;Jingzhao Chen;Hongjun Ye;Xiaomei Li;
锂金属是下一代锂电池的理想阳极，因为其具有3860 mAh g-1的非常高的理论比容量，但在暴露于环境空气时具有非常高的反应性，使其难以处理和运输。在先进的像差校正环境透射电子显微镜中，在CO2气氛下通过电化学电镀制备了空气稳定的锂球（ASLS）。ASLS具有Li核和Li 2CO 3壳的核-壳结构。在环境空气中，ASLS不与水分反应，并保持其核壳结构。此外，ASLS可用作锂离子电池的阳极，它们表现出与金属Li类似的电化学行为，表明表面Li 2CO 3层是良好的Li+离子导体。ASLS的空气稳定性归因于表面Li 2CO 3层，其几乎不溶于水，并且在室温下不与空气中的氧和氮反应，从而钝化Li芯。
Lithium metal is an ideal anode for next-generation lithium batteries owing to its very high theoretical specific capacity of 3860 mAh g-1 but very reactive upon exposure to ambient air, rendering it difficult to handle and transport. Air-stable lithium spheres (ASLSs) were produced by electrochemical plating under CO2 atmosphere inside an advanced aberration-corrected environmental transmission electron microscope. The ASLSs exhibit a core-shell structure with a Li core and a Li2 CO3 shell. In ambient air, the ASLSs do not react with moisture and maintain their core-shell structures. Furthermore, the ASLSs can be used as anodes in lithium-ion batteries, and they exhibit similar electrochemical behavior to metallic Li, indicating that the surface Li2 CO3 layer is a good Li+ ion conductor. The air stability of the ASLSs is attributed to the surface Li2 CO3 layer, which is barely soluble in water and does not react with oxygen and nitrogen in air at room temperature, thus passivating the Li core.