One-stone-for-two-birds strategy to construct robust 2D conjugated metal-organic framework-based quasi-solid-state lithium-organic batteries

Quasi-solid-state lithium batteries (QSSLBs) are emerging as attractive candidates for overcoming the disadvantages of liquid and solid batteries. However, they face challenges in terms of enhancing the poor interfacial stability and promoting selective Li⁺ conduction. Herein, one-stone-for-two-birds strategy is proposed that involves using a two-directional conjugated metal organic framework (2D-cMOF, Fe-TABQ) as both the cathode material and a polymer–electrolyte filler to construct high-performance quasi-solid-state lithium–organic batteries (QSSLOBs). Additionally, Fe-TABQ promotes the cleavage of C–F bonds, thus facilitating the formation of a LiF-rich solid electrolyte interface (SEI). Therefore, the composite polymer electrolyte presents a high Li⁺ transference number of 0.93 and a high ionic conductivity of 6.22 × 10⁻³ mS cm⁻¹. Meanwhile, Li/Li symmetric cells deliver stable cyclability for 1,500 h at 25 ℃ and a current density of 0.05 mA cm⁻². Even the assembled QSSLOBs exhibit a high initial discharge specific capacity of 248.39 mAh/g at 25 ℃, and 50 mA g⁻¹ and long cycle stability with 70 % capacity retention after 200 cycles at 25 ℃ and 1,000 mA g⁻¹. The present findings reveal the multiple functional potentials of 2D-cMOFs in constructing robust QSSLOBs