Wang Liubin, Ni Youxuan, Hou Xuesen, Chen Li, Li Fujun, Chen Jun
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.
College of Electronic Information and Optical Engineering, Nankai University, Tianjin, 300071, China.
Angew Chem Int Ed Engl. 2020 Dec 1;59(49):22126-22131. doi: 10.1002/anie.202008726. Epub 2020 Sep 23.
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 at 100 mA g and 345.4 mAh g at 8 A g . 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.
有机电极材料存在电子电导率低和结构稳定性差的问题。在此，通过d-π杂化合成了一种金属有机聚合物，镍配位四氨基苯醌（Ni-TABQ）。聚合物链通过氢键连接，形成了坚固的二维（2D）层状结构。它沿聚合物链和氢键方向提供电子传导和钠扩散途径。以共轭苯甲酰羰基和亚胺作为钠嵌入和脱出的氧化还原中心，Ni-TABQ在100 mA g时提供约469.5 mAh g的高容量，在8 A g时提供345.4 mAh g的高容量。大的容量在100次循环中得以保持，库仑效率几乎为100%。这种优异的电化学性能归因于由坚固的Ni-N键和氢键实现的独特二维电子传导和钠扩散途径。
