Functional Design of Metal-Organic Framework Based Solid-State Electrolytes as Superionic Conductors and Their Application in Lithium Metal Batteries
Compared to traditional lithium-ion batteries and liquid batteries,solid-state batteries hold greater potential for enhancing energy density and safety.However,existing solid-state electrolytes face numerous challenges in improving electrical conductivity and overcoming the issue of lithium dendrite formation.To solve this problem,MIL-101(Cr)Metal-organic framework(MOF)was selected as the main material,and the organic monomer 1,3-dioxane(DOL)with high conductivity was loaded on MIL-101(Cr)to design and prepare a new solid electrolyte.This method not only solves the problem of poor electrochemical stability of DOL,but also makes full use of the characteristics of MIL-101(Cr)rich in unsaturated metal sites,which limits the free movement of anions,accelerates the dissociation process of lithium ions,and thus increases the migration number of lithium ions.The results show that MIL-101(Cr)@DOL exhibits excellent ionic conductivity(0.92 mS∙cm-1),stable electrochemical window(4.65 V)and high lithium ion migration number(0.57).In addition,the Li//LiFePO4 battery assembled with MIL-101(Cr)@DOL also showed excellent rate and cycle performance,maintaining the specific discharge capacity of 128.9 mAh∙g-1 after 140 cycles at 0.2 C,and the capacity retention rate reached 82.9%.The new solid electrolyte synthesized by loading organic monomer DOL on MIL-101(Cr)is proposed in this study,which plays an inspiring role in the development of new solid electrolyte materials and the search for new ion conduction mechanism,and provides a new way and possibility for improving the performance of lithium metal batteries.
metal-organic framework1,3-dioxopentylenefunctional designin situ polymerizationsuperionic conductorsolid-state electrolytesolid-state batterylithium metal battery
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