Functionality of 1-Butyl-2,3-Dimethylimidazolium Bromide (BMI-Br) as a Solid Plasticizer in PEO-Based Polymer Electrolyte for Highly Reliable Lithium Metal Batteries,Advanced Energy Materials

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Functionality of 1-Butyl-2,3-Dimethylimidazolium Bromide (BMI-Br) as a Solid Plasticizer in PEO-Based Polymer Electrolyte for Highly Reliable Lithium Metal Batteries
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2023-11-02 , DOI: 10.1002/aenm.202301674
Eunhui Kim _{1,

2} , Hasan Jamal ₁ , Injun Jeon ₁ , Firoz Khan ₃ , Sang‐Eun Chun ₂ , Jae Hyun Kim ₁

Affiliation

To address the challenges associated with solid polymer electrolytes, flame-retardant organic ionic plastic crystals (OIPCs) have been utilized as a solid plasticizer in composite polymer electrolytes (CPEs). In this study, 1-butyl-2,3-dimethylimidazolium bromide (BMI-Br) is used as an OIPC material. BMI-Br and LiTFSI are initially mixed in an acetonitrile (ACN) organic solvent for a certain time. Anion exchange takes place in this mixing, replacing the Br⁻ in BMI-Br with TFSI⁻. As a result, BMI-TFSI and Li-Br are formed. Here, BMI-TFSI acts as an ionic liquid, while Li-Br serves as a salt. The 10% BMI-Br content (BMI-Br-10 CPE) exhibits significant ionic conductivity (σ = 2.34 × 10⁻³ S cm⁻¹ at 30 °C), wide window (up to 4.57 V), and flame retardancy. Furthermore, the BMI-Br-10 CPE demonstrates galvanostatic lithium plating stripping cycling stability at 100 and 300 µA cm⁻² for 800 and 500 h against Li-metal, respectively, without a significant overpotential shooting. Furthermore, at 60 °C, the BMI-Br-10 CPE in [LiFePO₄/BMI-Br-10/Li] batteries demonstrates an initial capacity of 146.9 mAh g⁻¹, capacity retention of 99.7% and high coulombic efficiency (99.5%) after 300 cycles at 1C.

中文翻译：

1-丁基-2,3-二甲基溴化咪唑 (BMI-Br) 作为固体增塑剂在 PEO 基聚合物电解质中用于高可靠性锂金属电池的功能

为了解决与固体聚合物电解质相关的挑战，阻燃有机离子塑料晶体（OIPC）已被用作复合聚合物电解质（CPE）中的固体增塑剂。在本研究中，使用 1-丁基-2,3-二甲基溴化咪唑鎓 (BMI-Br) 作为 OIPC 材料。 BMI-Br 和 LiTFSI 首先在乙腈 (ACN) 有机溶剂中混合一定时间。在此混合中发生阴离子交换，用 TFSI ⁻ 替换 BMI-Br 中的 Br ⁻ 。结果，形成BMI-TFSI和Li-Br。在此，BMI-TFSI充当离子液体，而Li-Br充当盐。 10% BMI-Br 含量 (BMI-Br-10 CPE) 表现出显着的离子电导率（30 °C 时 σ = 2.34 × 10 ⁻³ S cm ⁻¹ ）、宽窗口（高达 4.57 V）和阻燃性。此外，BMI-Br-10 CPE 在 100 和 300 µA cm ⁻² 下对锂金属表现出恒电流镀锂剥离循环稳定性，分别持续 800 和 500 小时，且没有明显的过电位射击。此外，在 60 °C 时，[LiFePO ₄ /BMI-Br-10/Li] 电池中的 BMI-Br-10 CPE 表现出 146.9 mAh g ⁻¹ 的初始容量， 1C 下循环 300 次后，容量保持率为 99.7%，库仑效率高 (99.5%)。

更新日期：2023-11-02

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