Controllable and Homogeneous Lithium Electrodeposition via Lithiophilic Anchor Points,The Journal of Physical Chemistry Letters

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Controllable and Homogeneous Lithium Electrodeposition via Lithiophilic Anchor Points
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2022-06-23 , DOI: 10.1021/acs.jpclett.2c01340
Litong Wang ₁ , Zhenjiang Yu ₂ , Yunlei Zhong _{1,

3} , Zhaorui Wen ₁ , Yuxin Tang ₄ , Guo Hong _{1,

5}

Affiliation

Uncontrollable growth of lithium (Li) dendrites and low Coulombic efficiency induce security hazards and a short cycling lifespan of Li metal batteries. In this study, well-aligned ZnO nanorods on a periodic three-dimensional (3D) copper mesh (CM) are modified as lithiophilic anchor points to regulate the electrodeposition behavior of Li metal anodes. The in situ generated LiZn/Li₂O arrays can efficiently guide the homogeneous Li electrodeposition along the nanorods. The porous structure of CM provides void space for the well-controlled lateral growth of Li starting from nanorod arrays. Moreover, the high surface area generated by both CM and the ZnO nanorods favors the charge transfer with low local current densities along the anode. Compared with bare Li anodes, Li-ZnO@CM anodes exhibited prolonged cycling stability for symmetric cells and superior capacity retention within Li/LiFePO₄ full cells, demonstrating the effective design principles of ZnO@CM for stabilizing Li metal batteries.

中文翻译：

通过亲锂锚点实现可控且均匀的锂电沉积

锂（Li）枝晶的不可控生长和低库仑效率会导致锂金属电池的安全隐患和短循环寿命。在这项研究中，周期性三维 (3D) 铜网 (CM) 上排列良好的 ZnO 纳米棒被修饰为亲锂锚点，以调节锂金属负极的电沉积行为。原位生成的LiZn/Li ₂O 阵列可以有效地引导沿纳米棒的均匀锂电沉积。CM 的多孔结构为从纳米棒阵列开始的锂的可控横向生长提供了空隙空间。此外，CM 和 ZnO 纳米棒产生的高表面积有利于沿阳极的低局部电流密度的电荷转移。与裸锂负极相比，Li-ZnO@CM 负极在对称电池中表现出更长的循环稳定性，并且在 Li/LiFePO ₄全电池中表现出优异的容量保持率，证明了 ZnO@CM 用于稳定锂金属电池的有效设计原理。

更新日期：2022-06-23

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