Dendrite-free Li Anode Enabled by a Metal–Organic Framework-Modified Solid Polymer Electrolyte for High-Performance Lithium Metal Batteries,ACS Applied Energy Materials

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Dendrite-free Li Anode Enabled by a Metal–Organic Framework-Modified Solid Polymer Electrolyte for High-Performance Lithium Metal Batteries
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2020-11-24 , DOI: 10.1021/acsaem.0c02369
Wenyan Shang ₁ , Yubing Chen ₁ , Jialun Han ₁ , Ping Ouyang ₁ , Chenxin Fang ₁ , Jie Du ₁

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Uncontrollable dendrite formation following the uneven deposition of lithium significantly affects the safety and service life of lithium metal batteries (LMBs). Therefore, a metal–organic framework solid polymer electrolyte (MSPE) with immobilized anions was prepared by the copolymerization of diallyl dicarbonate and a modified metal–organic framework material (MOFs). This not only avoids the agglomeration phenomenon caused by direct physical introduction of MOFs but also fixes the anion (TFSI^–) by the numerous coordinated unsaturated cation sites exposed on the MSPE. Based on space charge theory, anion coordination is an effective lithium dendrite elimination method that results in protection of the lithium anode within LMBs. As a result, the assembled Li/LiFePO₄ (LFP) cell exhibits a discharge specific capacity of 154.6 mA h g^–1 and a capacity retention rate of 95.75% after 200 charge–discharge cycles at 0.2 C (1 C = 180 mA h g^–1) at room temperature. More importantly, the assembled Li/Li symmetric cell with an MSPE exhibits a stable and low-potential cycle for 300 h at a current density of 0.5 mA cm^–2 and achieves dendrite-free lithium deposition. This study provides a promising MOF-based solid polymer electrolyte for safe and high-performance LMBs.

中文翻译：

高性能锂金属电池用金属有机骨架改性的固体聚合物电解质实现的无枝晶锂阳极

锂不均匀沉积后无法控制的枝晶形成会严重影响锂金属电池（LMB）的安全性和使用寿命。因此，通过使二碳酸二烯丙基酯与改性的金属有机骨架材料（MOFs）共聚，制备了具有固定阴离子的金属有机骨架固体聚合物电解质（MSPE）。这不仅避免了直接的物理介绍MOFs材料的集聚现象，但还修复了阴离子（TFSI ^-）通过暴露在MSPE众多的协调不饱和阳离子位。基于空间电荷理论，阴离子配位是一种有效的锂枝晶消除方法，可保护LMB中的锂阳极。结果，组装的Li / LiFePO ₄（LFP）电池在室温下于0.2 C（1 C = 180 mA hg ^–1）进行200个充放电循环后，其放电比容量为154.6 mA hg ^–1，容量保持率为95.75％。更重要的是，组装好的具有MSPE的Li / Li对称电池在0.5 mA cm ^–2的电流密度下表现出300小时的稳定且低电势循环，并实现了无枝晶状的锂沉积。这项研究为安全和高性能LMB提供了一种有前途的基于MOF的固体聚合物电解质。

更新日期：2020-12-28

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