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Anion‐Immobilized and Fiber‐Reinforced Hybrid Polymer Electrolyte for Advanced Lithium‐Metal Batteries
ChemElectroChem ( IF 3.5 ) Pub Date : 2020-06-07 , DOI: 10.1002/celc.202000591
Zhitao Wang 1 , Hu Zhou 2 , Chunfeng Meng 2 , Lu Zhang 1 , Yueji Cai 2 , Aihua Yuan 1
Affiliation  

3D‐skeleton‐reinforced hybrid polymer electrolytes (HPEs) are conducive to improving the electrochemical performance and mechanical strength, but their preparation methods are usually tedious and inappropriate for practical application. The simplification of the preparation process and the further optimization of 3D skeletons are urgent to develop high‐performance solid‐state batteries. In this work, glass fiber (GF) decorated with ZIF‐67 (GF@ZIF‐67) was originally selected as 3D skeleton to construct an anion‐immobilized and fiber‐reinforced polyethylene oxide (PEO)‐based HPE (GF@ZIF@PEO). The presence of GF@ZIF‐67 3D skeleton can enhance the mechanical strength, whereas Lewis‐acidic metal sites of ZIF‐67 can immobilize free anions of the polymer matrix, accelerating ion migration and facilitating long‐term cycling stability. Consequently, the assembled LiFePO4/Li solid‐state batteries delivered a reversible capacity of 132 mAh g−1 with the capacity retention of 92 % at 1 C after 200 cycles. Our universal approach paves the way for advanced solid‐state electrolytes.

中文翻译:

用于高级锂金属电池的阴离子固定和纤维增强混合聚合物电解质

3D骨架增强杂化聚合物电解质(HPE)有助于改善电化学性能和机械强度,但是其制备方法通常很繁琐,不适合实际应用。开发高性能固态电池迫切需要简化制备过程并进一步优化3D骨架。在这项工作中,最初选择用ZIF-67(GF @ ZIF-67)装饰的玻璃纤维(GF)作为3D骨架,以构建基于阴离子固定和纤维增强的聚环氧乙烷(PEO)的HPE(GF @ ZIF @)。 PEO)。GF @ ZIF‐67 3D骨架的存在可以增强机械强度,而ZIF‐67的路易斯酸性金属位点可以固定聚合物基体的游离阴离子,从而加速离子迁移并促进长期循环稳定性。所以,4个/ Li固态电池在200个循环后于1 C时可逆容量为132 mAh g -1,容量保持率为92%。我们的通用方法为高级固态电解质铺平了道路。
更新日期:2020-06-25
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