一种单离子聚合物复合电解质通过电解质单体原位聚合成用于锂金属电池的多孔 MOF 基纤维膜,ACS Applied Energy Materials

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一种单离子聚合物复合电解质通过电解质单体原位聚合成用于锂金属电池的多孔 MOF 基纤维膜
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2022-02-24 , DOI: 10.1021/acsaem.2c00282
Lining Chen ₁ , Ping Xue ₁ , Qian Liang ₁ , Xuezhi Liu ₁ , Junyan Tang ₁ , Jing Li ₁ , Junjie Liu ₁ , Mi Tang ₁ , Zhengbang Wang ₁

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单离子聚合物电解质由于锂离子迁移数高、与锂金属负极的界面相容性好、抑制锂枝晶等优点，在高安全性和高能量密度锂金属电池的开发中受到了广泛关注。阴离子的固定化。在这项工作中，我们通过将单离子聚合物单体原位光引发聚合成多孔金属有机框架（MOF）/聚合物电纺纤维膜，开发了一种新型的单离子聚合物复合电解质（SIPCE）。实验结果表明，接收到的 SIPCE-MOF 具有 0.80 的高锂离子迁移数、高达 5.68 V 的宽电化学稳定性窗口以及 1.14 × 10 ^–5和 2.23 × 10的显着离子电导率。^–5 S cm ^–1分别在 30 和 60 °C 时。此外，具有这种 SIPCE-MOF 的对称锂电池在 2 mA cm ^-2的电流密度下显示出 120 mV 的极化电压和超过 2200 小时的稳定循环时间，这意味着优异的长期锂电镀/剥离表现。因此，固态 LiFePO ₄ /SIPCE-MOF/Li 电池实现了无与伦比的倍率性能（2 C 时为 105 mAh g ^–1），并在 120 次循环后保持其初始容量的 98.3%，具有 99 的超高库仑效率% at 0.5 C. 这些优异的性能为单离子聚合物复合电解质在固态锂金属电池中的应用提供了巨大的潜力。

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A Single-Ion Polymer Composite Electrolyte Via In Situ Polymerization of Electrolyte Monomers into a Porous MOF-Based Fibrous Membrane for Lithium Metal Batteries

Single-ion polymer electrolytes have received considerable attention in the development of high-safety and high-energy-density lithium metal batteries due to their high lithium ion transference number, good interfacial compatibility with lithium metal anode, and suppression of lithium dendrite benefits from the immobilization of anions. In this work, we develop a novel single-ion polymer composite electrolyte (SIPCE) by an in situ photoinitiated polymerization of single-ion polymer monomers into porous metal–organic frameworks (MOF)/polymer electrospun fibrous membrane. Experimental results demonstrate that the received SIPCE-MOF exhibits a high lithium ion transference number of 0.80, a wide electrochemical stability window up to 5.68 V, and the remarkable ionic conductivity of 1.14 × 10^–5 and 2.23 × 10^–5 S cm^–1 at 30 and 60 °C, respectively. In addition, the lithium symmetrical battery with such SIPCE-MOF shows a polarization voltage of 120 mV at a current density of 2 mA cm^–2 and a stable cycling time of more than 2200 h, implying the excellent long-term lithium plating/stripping performance. As a result, the solid-state LiFePO₄/SIPCE-MOF/Li battery achieves an unparalleled rate performance (105 mAh g^–1 at 2 C) and maintains 98.3% of its initial capacity after 120 cycles with a superhigh Coulombic efficiency of 99% at 0.5 C. These excellent properties provide great potential for the application of single-ion polymer composite electrolytes in solid-state lithium metal batteries.

更新日期：2022-02-24

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