Lithium (Li) metal is a promising anode for high-performance secondary lithium batteries with high energy density due to its highest theoretical specific capacity and lowest electrochemical potential among anode materials. However, the dendritic growth and detrimental reactions with electrolyte during Li plating raise safety concerns and lead to premature failure. Herein, we report that a homogeneous nanocomposite protective layer, prepared by uniformly dispersing AlPO4 nanoparticles into the vinylidene fluoride-co-hexafluoropropylene matrix, can effectively prevent dendrite growth and lead to superior cycling performance due to synergistic influence of homogeneous Li plating and electronic insulation of polymeric layer. The results reveal that the protected Li anode is able to sustain repeated Li plating/stripping for > 750 cycles under a high current density of 3 mA cm−2 and a renders a practical specific capacity of 2 mAh cm−2. Moreover, full-cell Li-ion battery is constructed by using LiFePO4 and protected Li as a cathode and anode, respectively, rendering a stable capacity after 400 charge/discharge cycles. The current work presents a promising approach to stabilize Li metal anodes for next-generation Li secondary batteries.

中文翻译：

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用于稳定锂金属阳极的聚合物复合保护层。

锂（Li）金属由于其最高的理论比容量和最低的电化学势能而成为具有高能量密度的高性能二次锂电池的有希望的阳极。然而，锂电镀过程中的树枝状生长和与电解质的有害反应引起了安全隐患，并导致过早失效。本文中，我们报道了通过均匀分散AlPO4纳米颗粒到偏二氟乙烯-共-六氟丙烯基体中而制得的均匀纳米复合保护层，由于均匀的Li镀层和电子绝缘层的协同作用，可以有效地防止枝晶生长并导致优异的循环性能。聚合物层。结果表明，受保护的Li阳极能够在> 在3 mA cm-2的高电流密度下进行750次循环，实际比容量为2 mAh cm-2。此外，通过使用LiFePO4和受保护的Li分别作为正极和负极来构造全电池锂离子电池，经过400次充电/放电循环后可提供稳定的容量。当前的工作提出了一种稳定下一代锂二次电池锂金属阳极的方法。