NiMoO4/Reduced graphene oxide (NiMoO4/rGO) composites material was prepared by a hydrothermal method. When used as a anode material for lithium-ion batteries, the NiMoO4/rGO composites show superior rate capability and excellent cycling stability. A reversible capacity of approximately 808 mAh g–1 is retained even after 100 cycles at 100 mA g–1. It is believed that the surface modification by graphene nanosheets contribute to the improved kinetics of lithium-ion diffusion, excellent structural stability and superior electrochemical performance.
Abstract. The precursors of Mn2O3 was synthesized through co-precipitation method using MnAc2· 4H2O, NaHCO3 as raw materials. The precursors were heat-treated at 400℃, 500℃, and 600℃, respectively. The samples were characterized by X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. The electrochemical properties of the samples were investigated also. The test results showed that the Mn2O3 (heat-treated at and 600℃) featured higher reversible capacity and better cycling performance than that of other samples. The specific capacity of the Mn2O3 samples (heat-treated at and 600℃) was 745 mAh/g respectively after 100 cycles at a constant current of 100 mA/g in the voltage range of 0.01-3 V. The preparation principle for the formation of the Mn2O3 samples and its electrochemical process of Mn2O3 were discussed also.
Hexagonal Mn 2 O 3 nanoplates were synthesized by a hydrothermal method and then a annealing process. The Hexagonal Mn 2 O 3 nanoplates prepared at hydrothermal temperature 200 o C exhibited the best electrochemical properties with a high reversible capability and cycling stability, It still retains a high capacity of 565 mAh g-1 , even after 100 cycles, as anode materials for lithium-ion batteries. The good electrochemical performance for the porous Mn 2 O 3 microspheres can be attributed to its high surface area and mesoporous structure.
LiNi 1/3 Co 1/3 Mn 1/3 O 2 /C composite material was prepared by a rheological phase reaction method and successive annealing procedure. In the synthesis procedure, citric acid was selected as carbon source. The electrochemical tests showed that the LiNi 1/3 Co 1/3 Mn 1/3 O 2 /C could greatly improve the discharge capacity, rate capability and cycling stability due to the improved electric conductivity. The LiNi 1/3 Co 1/3 Mn 1/3 O 2 /C shows good electrochemical performance (the discharge capacity of 175 mAh g-1 at 50 mA/g, after 50 cycles). These results indicate that the samples could be a promising cathode material for lithium ion batteries.
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