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首页> 外文期刊>Advanced energy materials >Efficient Li-Ion-Conductive Layer for the Realization of Highly Stable High-Voltage and High-Capacity Lithium Metal Batteries
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Efficient Li-Ion-Conductive Layer for the Realization of Highly Stable High-Voltage and High-Capacity Lithium Metal Batteries

机译：高效的锂离子导电层，实现高稳定的高压和高容量锂金属电池

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摘要

Recently, a consensus has been reached that using lithium metal as an anode in rechargeable Li-ion batteries is the best way to obtain the high energy density necessary to power electronic devices. Challenges remain, however, with respect to controlling dendritic Li growth on these electrodes, enhancing compatibility with carbonate-based electrolytes, and forming a stable solid-electrolyte interface layer. Herein, a groundbreaking solution to these challenges consisting in the preparation of a Li2TiO3 (LT) layer that can be used to cover Li electrodes via a simple and scalable fabrication method, is suggested. Not only does this LT layer impede direct contact between electrode and electrolyte, thus avoiding side reactions, but it assists and expedites Li-ion flux in batteries, thus suppressing Li dendrite growth. Other effects of the LT layer on electrochemical performance are investigated by scanning electron microscopy, electrochemical impedance spectroscopy, and galvanostatic intermittent titration technique analyses. Notably, LT layer-incorporating Li cells comprising high-capacity/voltage cathodes with reasonably high mass loading (LiNi0.8Co0.1Mn0.1O2, LiNi0.5Mn1.5O4, and LiMn2O4) show highly stable cycling performance in a carbonate-based electrolyte. Therefore, it is believed that the approach based on the LT layer can boost the realization of high energy density lithium metal batteries and next-generation batteries.
机译：最近，已经达到了一种使用锂金属作为可充电锂离子电池中的阳极使用锂金属是获得电力电子设备所必需的高能量密度的最佳方法。然而，对于控制这些电极的树突锂生长，挑战仍然存在，增强与基于碳酸盐的电解质的相容性，并形成稳定的固体电解质界面层。在此，提出了在制备中，该挑战的开创性解决方案包括通过简单且可伸缩的制造方法用于覆盖Li电极的Li 2 TiO3（LT）层。该LT层不仅妨碍电极和电解质之间的直接接触，从而避免副反应，但它有助于并加快电池中的锂离子通量，从而抑制Li枝晶生长。通过扫描电子显微镜，电化学阻抗光谱和电镀间歇性滴定技术分析研究LT层对电化学性能的其他影响。值得注意的是，掺入包含具有相当高质量负载（LiNi0.8Co0.1Mn0.1O2，LiNi0.5Mn1.5O4和LiMn2O4）的高容量/电压阴极的L1层，所述锂基于碳酸盐基电解质中的高度稳定的循环性能。因此，据信，基于LT层的方法可以提高高能量密度锂金属电池和下一代电池的实现。

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