Novel lithium-lanthanide (Ln:c erium and praseodymium) bimetallic coordination polymers with formulas C 10 H 2 LnLiO 8 (Ln:C e( CeLipma) and Pr (PrLipma)) and C 10 H 3 CeO 8 (Cepma) were prepared through as imple hydrothermal method.T he three compounds were characterized by means of FTIR spectroscopy,X -ray diffraction, single-crystal X-ray diffraction, SEM, TEM, and X-ray photoelectron spectroscopy.T he results of structuralr efinement show that they belong to triclinic symmetry and P1 space group with cerium (or praseodymium) and lithiumc ations, forming co-ordination bonds to oxygen atoms from different pyromellitic acid molecules, and leading to the constructiono f3 D structures.I ti si nterestingt on ote that the frameworks exclude any coordination water and lattice water.A sa ne lectrode material for lithium-ionb atteries, CeLipma exhibits a maximumc apacity of 800.5 mAh g À1 and ar etention of 91.4 %a fter 50 cycles at ac urrent density of 100 mA g À1 .T he favorable electrochemical properties of the lanthanide coordination polymers show potential application prospects in the field of electrode materials.
The use of single-atom catalysts is a promising approach to solve the issues of polysulfide shuttle and sluggish conversion chemistry in lithium−sulfur (Li−S) batteries. However, a single-atom catalyst usually contains a low content of active centers because more metal ions lead to generation of aggregation or the formation of nonatomic catalysts. Herein, a 2D conductive metal−organic framework [Co 3 (HITP) 2 ] with abundant and periodic Co−N 4 centers was decorated on carbon fiber paper as a functional interlayer for advanced Li−S batteries. The Co 3 (HITP) 2 -decorated interlayer exhibits a chemical anchoring effect and facilitates conversion kinetics, thus effectively restraining the polysulfide shuttle effect. Density functional theory calculations demonstrate that the Co−N 4 centers in Co 3 (HITP) 2 feature more intense electron density and more negative electrostatic potential distribution than those in the carbon matrix as the singleatom catalyst, thereby promoting the electrochemical performance due to the lower reaction Gibbs free energies and decomposition energy barriers. As a result, the optimized batteries deliver a high rate capacity of over 400 mA h g −1 at 4 C current and a satisfying capacity decay rate of 0.028% per cycle over 1000 cycles at 1 C. The designed Co 3 (HITP) 2 -decorated interlayer was used to prepare one of the most advanced Li−S batteries with excellent performance (reversible capacity of 762 mA h g −1 and 79.6% capacity retention over 500 cycles) under high-temperature conditions, implying its great potential for practical applications.
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