Fluorobenzene, A Low‐Density, Economical, and Bifunctional Hydrocarbon Cosolvent for Practical Lithium Metal Batteries,Advanced Functional Materials

当前位置： X-MOL 学术 › Adv. Funct. Mater. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Fluorobenzene, A Low‐Density, Economical, and Bifunctional Hydrocarbon Cosolvent for Practical Lithium Metal Batteries
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2020-09-30 , DOI: 10.1002/adfm.202005991
Zhipeng Jiang _{1,

2} , Ziqi Zeng ₁ , Xinmiao Liang ₃ , Li Yang ₃ , Wei Hu ₁ , Ce Zhang _{1,

2} , Zhilong Han ₁ , Jiwen Feng ₃ , Jia Xie ₁

Affiliation

Highly concentrated electrolytes (HCEs) significantly improve the stability of lithium metal anodes, but applications are often impeded by their limitation of density, viscosity, and cost. Here, fluorobenzene (FB), an economical hydrocarbon with low density and low viscosity, is demonstrated as a bifunctional cosolvent to obtain a novel FB diluted highly concentrated electrolyte (FB‐DHCE). First, the addition of FB suppresses the decomposition of dimethoxyethane (DME) on the Li metal by strengthening the interactions of DME and FSI⁻ around Li⁺. Second, FB efficiently elevates the content of LiF in the solid electrolyte interphase (SEI) based on its electrochemical reduction reaction. The unique solvation and interfacial chemistry of FB‐DHCE enable dendrite‐free deposition of lithium with high Coulombic efficiency (up to 99.3%) and prolong cycling life (over 500 cycles at 1 mA cm⁻²). The performance of FB‐DHCE is further demonstrated in full cells under practical conditions, including ambient to low temperature (–20 °C), high areal capacity (7.6 mAh cm⁻²), high current density (3 mA cm⁻²), limited excess Li (20 µm Li), and lean electrolyte (3 g Ah⁻¹). Employing FB as a cosolvent not only opens a novel pathway to stabilize Li metal anodes, but also could greatly advance the development of Li metal batteries.

中文翻译：

氟苯，一种用于实用锂金属电池的低密度，经济且双功能的烃类助溶剂

高浓度电解质（HCE）可以显着提高锂金属阳极的稳定性，但由于其密度，粘度和成本的限制，应用常常受到阻碍。在这里，氟苯（FB）是一种低密度，低粘度的经济型烃，被证明是一种双功能助溶剂，可以得到新型的FB稀释高浓缩电解质（FB-DHCE）。首先，除了FB，通过加强二甲醚和FSI的交互抑制的锂金属二甲醚（DME）的分解^-围绕李⁺。其次，基于其电化学还原反应，FB有效提高了固态电解质相（SEI）中LiF的含量。FB‐DHCE独特的溶剂化和界面化学特性使锂的无树突状沉积具有高库仑效率（高达99.3％），并延长了循环寿命（在1 mA cm ^-2时超过500个循环）。FB‐DHCE的性能在实际条件下的全电池中得到了进一步证明，包括环境温度至低温（–20°C），高面容量（7.6 mAh cm ^-2），高电流密度（3 mA cm ^-2），有限的过量Li（20 µm Li）和稀薄的电解质（3 g Ah ^-1）。将FB用作助溶剂不仅为稳定锂金属阳极开辟了一条新途径，而且可以大大促进锂金属电池的发展。

更新日期：2020-09-30

点击分享查看原文

点击收藏

阅读更多本刊新发论文本刊介绍/投稿指南