ZnMnO3 has attracted enormous attention as a novel anode material for rechargeable lithium-ion batteries due to its high theoretical capacity.

Two redox active azo-based metal–organic frameworks (Cu-MOF 1 and Ni-MOF 2) exhibit high specific capacities, good rate performances and cycling stabilities when directly used as anode materials for lithium-ion batteries (LIBs).

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A copper-based redox-active metal-organic framework (Cu-MOF) is solvothermally synthesized from Cu(NO 3 ) 2 with the ligand 5,5-(1,3,6,8-tetraoxobenzo[Imn] [3,8]phenanthroline-2-7diyl)-bis-1,3-benzenedicarboxylic acid. The as-prepared Cu-MOF is characterized by X-ray diffraction, automatic sphere surface analyzer, field emission scanning electron microscopy, and X-ray photoelectron spectroscopy. The electrochemical properties of Cu-MOF as an anode are investigated for lithium-ion batteries. The Cu-MOF exhibits superior performance including high reversible capacity and excellent cyclic stability. The Cu-MOF shows high initial charge capacity of 753.7 mAh g À 1 , and still remains approximately 53% of its capacity after 500 cycles. In addition, it is revealed that the oxidation/reduction of copper ion in Cu-MOF occurred during charge and discharge process. Figure 8. EIS spectra of Li-ion cells using Cu-MOF electrodes before cycle and after 50 cycles, respectively, and the corresponding equivalent circuit model. ChemistrySelectFull Papers

composite was prepared by the combination of mechanical ball milling and heat treatment. The as-prepared LiCoO 2 /LiNi 0.8 Co 0.1 Mn 0.1 O 2 composite was characterized by X-ray diffraction, scanning electron microscopy, and energy-dispersive X-ray Spectroscopy. The LiCoO 2 /LiNi 0.8 Co 0.1 Mn 0.1 O 2 composite was utilized as cathode material for lithium-ion batteries. Compared with the milled LiCoO 2 /LiNi 0.8 Co 0.1 Mn 0.1 O 2 composite, the LiCoO 2 /LiNi 0.8 Co 0.1 Mn 0.1 O 2 composite after heat treatment exhibited superior performance, including in an increased coulombic efficiency, better capacity retention and enhanced rate capability. The present work demonstrated that Ni and Mn from LiNi 0.8 Co 0.1 Mn 0.1 O 2 were co-doped for the LiCoO 2 during high temperature, resulting in improving the electrochemical properties of the LiCoO 2 /LiNi 0.8 Co 0.1 Mn 0.1 O 2 composite.