Stable Cycling of Lithium-Metal Batteries in Hydrofluoroether-Based Localized High-Concentration Electrolytes with 2-Fluoropyridine Additive,ACS Applied Energy Materials

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Stable Cycling of Lithium-Metal Batteries in Hydrofluoroether-Based Localized High-Concentration Electrolytes with 2-Fluoropyridine Additive
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2022-05-10 , DOI: 10.1021/acsaem.2c00037
Qian Wu _{1,

2} , Yan Qian ₁ , Xin Tang _{1,

2} , Jinhan Teng _{1,

2} , Haiyang Ding ₁ , Haomiao Zhao ₁ , Jing Li _{1,

2}

Affiliation

Li-metal has been regarded as one of the most ideal anode material candidates for next-generation lithium (Li) batteries. However, the deployment of high-energy-density Li-metal batteries (LMBs) is hindered by growth of dendrites, low coulomb efficiency, safety concerns, and limited cycle life. Herein, a 2-fluoropyridine (2-FP) additive is introduced into the fire-retardant lithium bis(flfluorosulfonyl)imide (LiFSI) triethyl phosphate (TEP)/hydrofluoroether (HFE)-based localized high-concentration electrolyte (LHCE), which significantly enhances the cycling stability of LMBs. The 2-FP additive successfully forms a high-quality LiF-rich interface on Li-metal anode to enhance the mechanical strength and the Li⁺ diffusion kinetics of the solid electrolyte interface (SEI), and it greatly optimizes the Li-metal deposition process to improve the compatibility of the electrolyte with Li-metal anode. Based on the electrolyte, the LMBs exhibit excellent cycling performance of 1000 cycles and realize 90.8% capacity retention rate at 1C. In addition, the Li||Li cells show long-term cycling stability for 2140 h and the Li||Cu cells achieve a high CE of 98.81%.

中文翻译：

含 2-氟吡啶添加剂的氢氟醚基局部高浓度电解质中锂金属电池的稳定循环

锂金属被认为是下一代锂（Li）电池最理想的负极材料候选者之一。然而，高能量密度锂金属电池（LMB）的部署受到枝晶生长、库仑效率低、安全问题和循环寿命有限的阻碍。在此，将 2-氟吡啶 (2-FP) 添加剂引入到阻燃的双（氟磺酰）亚胺锂 (LiFSI) 磷酸三乙酯 (TEP)/氢氟醚 (HFE) 基局部高浓度电解液 (LHCE) 中，显着提高了 LMB 的循环稳定性。2-FP 添加剂成功地在锂金属负极上形成了高质量的富 LiF 界面，以提高机械强度和 Li ⁺固体电解质界面（SEI）的扩散动力学，极大地优化了锂金属的沉积过程，提高了电解质与锂金属负极的相容性。基于该电解质，LMBs 表现出优异的 1000 次循环性能，并在 1C 下实现了 90.8% 的容量保持率。此外，Li||Li 电池表现出 2140 小时的长期循环稳定性，Li||Cu 电池实现了 98.81% 的高 CE。

更新日期：2022-05-10

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