Significantly promoting the lithium-ion transport performances of MOFs-based electrolytes via a strategy of introducing fluoro groups in the crystal frameworks

Jia Guo; Xin Wang; Lu Shi; Zhiliang Liu

doi:10.1039/d4cc06006g

Significantly promoting the lithium-ion transport performances of MOFs-based electrolytes via a strategy of introducing fluoro groups in the crystal frameworks

Chem Commun (Camb). 2025 Jan 13. doi: 10.1039/d4cc06006g. Online ahead of print.

Authors

Jia Guo¹, Xin Wang¹, Lu Shi¹, Zhiliang Liu¹

Affiliation

¹ Inner Mongolia Key Laboratory of Chemistry and Physics of Rare Earth Materials, School of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot 010021, P. R. China. cezlliu@imu.edu.cn.

PMID: 39801298
DOI: 10.1039/d4cc06006g

Abstract

Metal-organic frameworks (MOFs) with well-ordered channels are considered ideal solid-state electrolytes (SSEs) for lithium ionic conductors and are expected to be utilized in all-solid-state Li-ion batteries. However, the outstanding Li⁺ conductivity of MOFs, especially the properties at low temperatures, has become a crucial problem to overcome. Herein, a breakthrough is first realized to cope with this challenge via a strategy of introducing fluoro-substituted bridging ligands in MOFs. Benefiting from the fluorinated strategy in MOFs (Cu-MOF-F₄), an outstanding Li⁺ conductivity of 1.16 × 10^-3 S cm^-1 at room temperature, a low activation energy of 0.15 eV, and a high transference number of 0.84 are achieved. In particular, Cu-MOF-F₄ shows high conductivities of (0.15-2.99) × 10^-3 S cm^-1 in the temperature range of -40 to 110 °C. The proposed novel fluoro-substituted strategy of bridging ligands in MOFs is of great significance for developing high-performance SSEs for solid-state lithium batteries.