Structurally Tailored Hierarchical Cu Current Collector with Selective Inward Growth of Lithium for High-Performance Lithium Metal Batteries,Advanced Energy Materials

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Structurally Tailored Hierarchical Cu Current Collector with Selective Inward Growth of Lithium for High-Performance Lithium Metal Batteries
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2022-11-23 , DOI: 10.1002/aenm.202202321
Inyeong Yang ₁ , Ji‐hun Jeong ₁ , Jae Young Seok ₂ , Sanha Kim ₁

Affiliation

Li-metal is gaining attention as a next generation anode active material, of which the primary attribute is its energy density. However, Li dendrite formation is the primary challenge. Herein, a design strategy with increased structural dimensions and hierarchy for Li-metal anode is investigated to stabilize the dendrite formation for extending the cycle life with high reversibility. For this, diverse structural current collectors (CCs) are fabricated by manipulating structural design in different length scales and characterized as a Li-metal anode. The hierarchy (i.e., nanostructures inside the microcavities) can not only reduce the current density on entire anode surface but also concentrate the local electrical field onto inner surfaces of the microstructures, inducing preferential Li nucleation inside microcavities and promoting confined growth of Li. It is confirmed that introduction of structural hierarchy can enhance the cycle life by 364% and the preservation of coulombic efficiency > 90% by 266%. The design strategy is extended by exploring a practical one-step fabrication of the hierarchical CC with even greater performance via the inward growth mechanism. This work elucidates the mechanism of inward Li growth using tailored surface geometries for Li dendrite suppression, which can be a guideline for designing structured anode CCs for Li-metal batteries.

中文翻译：

用于高性能锂金属电池的锂选择性向内生长的结构定制分层铜集电器

锂金属作为下一代负极活性材料正受到关注，其主要属性是其能量密度。然而，锂枝晶的形成是主要的挑战。在此，研究了一种增加锂金属负极结构尺寸和层次结构的设计策略，以稳定枝晶形成，从而以高可逆性延长循环寿命。为此，通过在不同长度尺度上操纵结构设计来制造不同结构的集电器 (CC)，并将其表征为锂金属负极。层次结构（即微腔内的纳米结构）不仅可以降低整个阳极表面的电流密度，还可以将局部电场集中到微结构的内表面，在微腔内诱导锂优先成核并促进锂的受限生长。经证实，引入结构层次可以将循环寿命提高 364%，并将库仑效率保持 > 90% 提高 266%。通过向内生长机制探索具有更高性能的分层 CC 的实用一步制造来扩展设计策略。这项工作阐明了使用定制的表面几何形状来抑制锂枝晶的锂向内生长的机制，这可以作为设计锂金属电池结构化阳极 CC 的指南。通过向内生长机制探索具有更高性能的分层 CC 的实用一步制造来扩展设计策略。这项工作阐明了使用定制的表面几何形状来抑制锂枝晶的锂向内生长的机制，这可以作为设计锂金属电池结构化阳极 CC 的指南。通过向内生长机制探索具有更高性能的分层 CC 的实用一步制造来扩展设计策略。这项工作阐明了使用定制的表面几何形状来抑制锂枝晶的锂向内生长的机制，这可以作为设计锂金属电池结构化阳极 CC 的指南。

更新日期：2022-11-23

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