Kill two birds with one stone: MOFs with carboxyl functionalized channels are used in lithium battery negative terminals and zinc-ion batteries

Tin-based materials are expected to be a research hotspot for large-scale energy storage, owing to their unique advantages such as abundant storage capacity and high theoretical capacity. However, the low efficiency of the first coulomb and the poor cycle stability seriously restrict the further development. Herein, we put forward to successfully prepared a uniform Sn-PMA-(COOH)2 with carboxy-functionalized pore channels and the derived Sn-PMA-(COOLi)2 as multifunctional ion transport channels for lithium anode, and Sn-PMA-(COOH)2 is also used as a multifunctional ion conduction interface for aqueous zinc batteries (AZIBs). Compared with the original Tin-based metal-organic framework (MOF, Sn-PMA), better cycle performance and magnification performance are achieved. The reason for this is the electrostatic interaction between carboxyl functional groups and lithium ions enhances the reversible storage of multiple lithium ions on the surface of the material. Zinc anodes can be stabilized by inhibiting water-induced side reactions and dendrite growth as multifunctional ionic conductive interface. Our work provides a novel approach to achieve carboxyl precise grafting of Sn-PMA modification into bi-functional materials, which is of great significance for revealing the role of oxygen-containing carbonyl functional groups in storage and transportation and to develop high-performance lithium/zinc ion battery negative electrode.