A Two-Dimensional Metal-Organic Polymer Enabled by Robust Nickel-Nitrogen and Hydrogen Bonds for Exceptional Sodium-Ion Storage

Liubin Wang; Youxuan Ni; Xuesen Hou; Li Chen; Fujun Li; Jun Chen

doi:10.1002/anie.202008726

A Two-Dimensional Metal-Organic Polymer Enabled by Robust Nickel-Nitrogen and Hydrogen Bonds for Exceptional Sodium-Ion Storage

Angew Chem Int Ed Engl. 2020 Dec 1;59(49):22126-22131. doi: 10.1002/anie.202008726. Epub 2020 Sep 23.

Authors

Liubin Wang¹, Youxuan Ni¹, Xuesen Hou¹, Li Chen², Fujun Li¹, Jun Chen¹

Affiliations

¹ Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Renewable Energy Conversion and Storage Center (RECAST), College of Chemistry, Nankai University, Tianjin, 300071, China.
² College of Electronic Information and Optical Engineering, Nankai University, Tianjin, 300071, China.

PMID: 32812334
DOI: 10.1002/anie.202008726

Abstract

Organic electrode materials suffer from low electronic conductivity and poor structure stability. Herein, a metal-organic polymer, Ni-coordinated tetramino-benzoquinone (Ni-TABQ), is synthesized via d-π hybridization. The polymer chains are stitched by hydrogen bonds to feature as a robust two-dimensional (2D) layered structure. It offers both electron conduction and Na⁺ diffusion pathways along the directions of the polymer chains and the hydrogen bonds. With both the conjugated benzoid carbonyls and imines as the redox centers for the insertion and extraction of Na⁺ , the Ni-TABQ delivers high capacities of about 469.5 mAh g^-1 at 100 mA g^-1 and 345.4 mAh g^-1 at 8 A g^-1 . The large capacities are sustained for 100 cycles with almost 100 % coulombic efficiencies. The exceptional electrochemical performance is attributed to the unique 2D electron conduction and Na⁺ diffusion pathways enabled by the robust Ni-N and hydrogen bonds.

Keywords: hydrogen bonds; metal-organic polymers; redox centers; sodium-ion batteries; specific capacity.