C–F-rich oil drop as a non-expendable fluid interface modifier with low surface energy to stabilize a Li metal anode,Energy & Environmental Science

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C–F-rich oil drop as a non-expendable fluid interface modifier with low surface energy to stabilize a Li metal anode
Energy & Environmental Science ( IF 32.4 ) Pub Date : 2021-4-29 , DOI: 10.1039/d0ee03952g
Qifan Yang _{1,

2,

3,

4,

5} , Jiulin Hu _{1,

2,

3,

4,

5} , Junwei Meng _{1,

2,

3,

4,

5} , Chilin Li _{1,

2,

3,

4,

5}

Affiliation

Metallic Li is currently the most promising anode material for use in next-generation batteries in the pursuit of higher energy densities. However, its uncontrollable electro-deposition can result in unstable breakage of the solid electrolyte interphase (SEI) and severe dendrite growth, hindering the commercialization of Li metal batteries (LMBs). Here, a strategy for non-expendable fluid interface modification is proposed by interposing a C–F-rich oil drop (perfluoropolyether, PFPE) with a low surface energy to address the deformation of the Li anode. Different from usual additives, which disperse in the electrolyte and are sacrificed during cycling, this laminated oil drop can endurably protect the Li anode from a side reaction with the electrolyte and mitigate Li-salt consumption. Its high fluidity and inertness enable the ‘dynamic’ healing of ‘hot-spots’ without the compromise of Li⁺ permeability and Li nucleation kinetics. The PFPE moieties close to the Li skin trigger the interface enrichment of the C–F and Li–F components to reinforce the robustness of the SEI and the compactness of the Li plating (from mosaic-tile-like packing to a dense interconnected network). This strategy endows LiNi_0.8Mn_0.1Co_0.1O₂/Li full cells with an ultralong cycling life (over 700 cycles) and an ultrahigh rate endurance (up to 10C). This study provides a novel route to high-performance LMBs based on immiscible liquid interlayers as a permanent modulator.

中文翻译：

富CF的油滴作为一种非消耗性的流体界面改性剂，具有较低的表面能，可稳定锂金属阳极

为了追求更高的能量密度，金属锂目前是用于下一代电池的最有希望的负极材料。然而，其不可控的电沉积会导致固体电解质中间相（SEI）的不稳定破裂和严重的枝晶生长，从而阻碍了锂金属电池（LMB）的商业化。在这里，提出了一种非消耗性流体界面改性的策略，方法是通过插入具有低表面能的富含CF的油滴（全氟聚醚，PFPE）来解决Li阳极的变形。与分散在电解质中并在循环过程中牺牲的常规添加剂不同，该层压油滴可以持久地保护Li阳极免于与电解质发生副反应并减轻Li盐的消耗。⁺渗透率和Li成核动力学。接近锂皮的PFPE部分触发了CF和Li-F组分的界面富集，从而增强了SEI的坚固性和Li镀层的致密性（从类似马赛克的堆积到密集的互连网络）。这种策略赋予LiNi_0.8 Mn_0.1 Co_0.1 O₂ / Li充满电电池以超长的循环寿命（超过700个循环）和超高的倍率耐力（高达10C）。这项研究为基于不可混溶液体中间层作为永久性调节剂的高性能LMB提供了一条新颖的途径。

更新日期：2021-05-19

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