Surface-Based Li+ Complex Enables Uniform Lithium Deposition for Stable Lithium Metal Anodes,ACS Applied Energy Materials

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Surface-Based Li+ Complex Enables Uniform Lithium Deposition for Stable Lithium Metal Anodes
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2019-07-03 00:00:00 , DOI: 10.1021/acsaem.9b00929
Qian Wang ₁ , Chengkai Yang ₁ , Yufei Zhang ₁ , JiJin Yang ₂ , Kai Wu ₁ , Cejun Hu ₂ , Jing Lu ₃ , Wen Liu ₂ , Henghui Zhou _{1,

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Affiliation

Uncontrollable Li dendrites growth and low Coulombic efficiency (CE) have severely prevented the practical applications of Li metal anode. Here, we propose to use poly(ethylene glycol) (PEG) as an electrolyte additive for suppressing dendritic growth and improving the cycling stability of Li metal anode. The PEG molecule can be absorbed on the surface of Li metal and complex with the Li⁺ ions effectively, which ensures a homogeneous diffusion of Li⁺ near the electrode surface and fundamentally avoids dendrite formation. Thus, full cells with LiFePO₄|Li configuration can even maintain ∼100% capacity with CE > 99.5% after 250 cycles at 5.0 C.

中文翻译：

基于表面的Li ^+配合物可实现稳定锂金属阳极的均匀锂沉积

不可控的锂枝晶生长和低库仑效率（CE）严重阻碍了锂金属阳极的实际应用。在此，我们建议使用聚乙二醇（PEG）作为电解质添加剂来抑制树枝状晶体的生长并改善锂金属阳极的循环稳定性。PEG分子可以被吸收在Li金属表面并有效地与Li ⁺离子络合，从而确保Li ⁺在电极表面附近的均匀扩散，从根本上避免了枝晶的形成。因此，在5.0 C下经过250次循环后，具有LiFePO ₄ | Li构型的完整电池甚至可以维持〜100％的容量，CE> 99.5％。

更新日期：2019-07-03

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