Search

Tin-based materials have a high theoretical capacity as a negative electrode material for lithium-ion batteries. However, the problem of volume expansion during lithium-ion insertion and extraction has severely limited its development. In this work, sodium–tin metal–organic framework (Na–Sn-MOF) compounds were successfully synthesized by simple reflux method. And we studied the reaction mechanism of the compound as anode materials for lithium-ion batteries. The special stable structure constructed by the 1,4-benzenedicarboxylic acid ligands and larger Na+ ions will limit volume expansion of the tin effectively during the process of lithium–delithium. Therefore, the sodium–tin metal–organic framework anode material exhibits a high lithium storage capacity of 523 mAh g−1 with good cycling stability and rate capability. In addition, the Coulombic efficiency of the anode material for lithium-ion batteries is closed to 100% when the lithium ions are constantly embedded and released. This work for solving the problem of volume expansion of tin-based materials is quiet meaningful. [ABSTRACT FROM AUTHOR]

Sn-based materials have great potential as anode materials for lithium-ion batteries. However, large volume expansion hinders the development of Sn-based materials. With the special structure of the metal-organic frameworks (MOFs), the electrode materials can maintain structural stability during the Li+ reversible insertion/exsertion process. Here, Sn-based MOFs anode materials with different morphologies are prepared by two different flexible and controllable methods, reflux method (named as reflux Sn-MOF), and hydrothermal method (named as hydrothermal Sn-MOF). The structures and electrochemical properties of the as-prepared samples are estimated by scanning electron microscopy, powder X-ray diffraction, thermogravimetric analysis, X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, cyclic voltammetry, charge-discharge characterizations, etc. The reflux Sn-MOF materials exhibit better electrochemical properties than the hydrothermal one for anode materials. The results reveal that the reflux Sn-MOF anode material shows a higher lithium storage capacity of 613 mAh g−1 with the Coulombic efficiency close to 99%. [ABSTRACT FROM AUTHOR]

Abstract: By locating elemental Sn in an open anionic framework, the particle cracking arising from huge volume expansion of Sn‐based anode materials during lithiation/delithiation is alleviated, and the cycling stability is greatly improved. The Sn‐based metal–organic framework anode material shows superior cyclic stability, with a capacity retention >92 % (after 200 cycles) and high lithium storage capacity (610 mAh g−1). [ABSTRACT FROM AUTHOR]

A new coordination polymer of [Mn(SO)( L)·(HO)] was synthesized by the interaction of a big π-conjugated rigid ligand 1,4-bis([1,10]phenanthroline-[5,6-d]imidazol-2-yl)benzene( L) and manganese sulfate, exhibiting a eightfold interpenetrated diamondoid network. In addition, the thermal stability and luminescence property of the complex have been studied in this work. [ABSTRACT FROM AUTHOR]

Two novel coordination polymers of [Cd(NIPH)(imH)HO]·nHO (1) and [Cd(NIPH)(imH)(CHCHO)] (2) (HNIPH = 5-nitroisophthalic, imH = 1H-imidazole) were successfully synthesized by controlling the ratio of reaction solvents and characterized by element analysis, FT-IR, TG analysis, single crystal X-ray diffraction. Complex 1 exhibits a zigzag-like chain pattern containing mononuclear cadmium building blocks, while complex 2 shows a ladder-like double chain pattern with binuclear cadmium building blocks. Both of the two complexes show high thermal stability. In addition, the photoluminescence properties of the two complexes have been studied in this work. [ABSTRACT FROM AUTHOR]

A new metal-organic architectures, [Cu(NA)(DMF)] ( 1), where NA stands for nicotinic acid, has been successfully synthesized and characterized by elemental analysis, IR, TG analysis and single crystal X-ray diffraction. Single-crystal X-ray diffraction reveals that the Cu centers adopt a distorted square pyramidal geometry, and nicotinic acid acts as a bidentate ligand connected with the adjacent two Cu atoms by the pyridyl and carboxylate groups to form a 3D framework structure. The framework exhibits open chiral channels with coordinated DMF molecules inside it. In addition, the magnetic properties have also been studied. [ABSTRACT FROM AUTHOR]