Current-Density Regulating Lithium Metal Directional Deposition for Long Cycle-Life Li Metal Batteries,Angewandte Chemie International Edition

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Current-Density Regulating Lithium Metal Directional Deposition for Long Cycle-Life Li Metal Batteries
Angewandte Chemie International Edition ( IF 16.1 ) Pub Date : 2021-06-06 , DOI: 10.1002/anie.202105831
Heng Mao ₁ , Wei Yu ₁ , Zhuanyun Cai ₂ , Guixian Liu ₃ , Limin Liu ₁ , Rui Wen ₃ , Yaqiong Su _{1,

2} , Huari Kou ₁ , Kai Xi ₁ , Benqiang Li ₄ , Hongyang Zhao ₁ , Xinyu Da ₁ , Hu Wu ₁ , Wei Yan ₅ , Shujiang Ding ₁

Affiliation

Uncontrolled dendrite formation in the high energy density of lithium (Li) metal batteries (LMBs) may pose serious safety risks. While numerous studies have attempted to protect separators, these proposed methods fail to effectively inhibit upward dendrite growth that punctures through the separator. Here, we introduce a novel “orientated-growth” strategy that transfers the main depositional interface to the anode/current collector interface from the anode/separator interface. We placed a layer of cellulose/graphene carbon composite aerogel (CCA) between the current collector and the anode (LCL-bottom). This layer works as a charge organizer that induces a high current density and encourages Li to deposit at the anode/current collector interface. Both in situ and ex situ images of the electrode demonstrate that the anode part of the cell has been flipped; with the newly deposited particles facing the current collector and the smooth surface facing the separator. The electrode in half and full cells showed outstanding cyclic stability and rate capability, with the LCL-bottom/LFP full cell capable of maintaining 94 % of its initial capacity after 1000 cycles.

中文翻译：

用于长循环寿命锂金属电池的电流密度调节锂金属定向沉积

锂 (Li) 金属电池 (LMB) 的高能量密度中不受控制的枝晶形成可能会带来严重的安全风险。虽然许多研究试图保护隔板，但这些提出的方法未能有效抑制刺穿隔板的向上枝晶生长。在这里，我们引入了一种新的“定向生长”策略，将主要沉积界面从阳极/隔膜界面转移到阳极/集电器界面。我们在集电器和阳极（LCL 底部）之间放置了一层纤维素/石墨烯碳复合气凝胶（CCA）。该层作为电荷组织者，产生高电流密度并促使锂沉积在阳极/集电器界面。电极的原位和非原位图像都表明电池的阳极部分已经翻转；新沉积的颗粒面向集电器，光滑的表面面向隔板。半电池和全电池中的电极显示出出色的循环稳定性和倍率性能，LCL-bottom/LFP 全电池在 1000 次循环后能够保持其初始容量的 94%。

更新日期：2021-06-06

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