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Due to the large volume change and poor conductivity, manganese oxide with high theoretical specific capacity is difficult to be widely used in the anode of lithium-ion battery. By the self-propagating sol–gel method, the nano-sized manganese oxide particles are embedded in the amorphous porous C in situ. Amorphous porous C and nano-manganese oxide particles can alleviate the volume effect of manganese oxide, and C can increase the conductivity and stability of Mn2O3/Mn3O4/C composites. Therefore, Mn2O3/Mn3O4/C composites have excellent cyclic properties: 902.9 mAh/g at 1.0 A/g after 1300 cycles; 290.5 mAh/g at 5.0 A/g after 10,000 cycles; 183.3 mAh/g at 10 A/g after 10,000 cycles. [ABSTRACT FROM AUTHOR]

In this study, a Prussian Blue-bismuth (PB-Bi) microcube composite anode material was designed and synthesized by introducing Bi ions into Prussian blue (PB). Through the morphology, structure and electrochemical performance test at different heat treatment temperatures, it is found that Bi2O3/Fe2O3 composites inherit the microcube structure of PB at the optimum annealing temperature of 500 ℃. When used as anode material for lithium-ion batteries, the composite has excellent electrochemical performance, and its discharge specific capacity can still maintain 576.6 mAh g−1 after 100 cycles at the current density of 100 mA g−1. The results show that by introducing Bi ions into PB to form Bi2O3/Fe2O3 microcubic composite anode material, the active site of Li ion diffusion and migration is greatly improved, thus improving the excellent electrochemical performance of the anode material. All in all, the composites provide a new direction for the research of Bi-based lithium-ion battery anode materials. [ABSTRACT FROM AUTHOR]

In this work, a spherical Sn-MOF precursor was synthesized through hydrothermal method using 1,3,5-benzenetricarboxylic acid (H3BTC) as the organic ligand. Sn-MOF-200, Sn-MOF-250, and Sn-MOF-300 were obtained at different annealing temperatures. Among them, the Sn-MOF-250 composite obtained by annealing at 250 ℃ was stable in structure, and the specific surface area is 118.8 m2 g−1. The specific capacity of Sn-MOF-250 can be maintained up to 846.6 mA h g−1 after 110 cycles at the current density of 100 mA g−1 when used as the anode material of lithium-ion battery. The excellent cycling performance of Sn-MOF-250 is due to the special framework structure of metal–organic frameworks (MOFs). After combining with Sn ion, the metal–organic coordination compound formed can greatly improve the diffusion and transport efficiency of lithium ion. This facile synthesis strategy has a certain application prospect in the development of high-performance lithium-ion battery anode materials. [ABSTRACT FROM AUTHOR]

The multi branched spherical MnCO3 was synthesized by solvothermal method with MnSO4 as manganese source and sodium citrate as surfactant. The morphology of the materials was characterized electron microscopy (SEM). The electrochemical properties of the materials were characterized by constant current charge discharge method. The electrochemical properties of the materials were characterized by constant current charge discharge method. The morphology of multi branched spherical MnCO3 is affected by CA(citric acid)/OH– molar ratio, reaction temperature and time, the type of solvent. The result shows, the multi branched spherical MnCO3 with a diameter of about 1–2 μm is obtained when CA/OH– is 1/2.5, reaction temperature and time is 180°C/18 h, added 30 mL deionized water. The sample synthesized at the optimized condition exhibited the first specific capacity of 2301.6 mA h g–1 at the current density of 100 mA g–1 and a good rate performance. The morphology of manganese carbonate is expected to be used as the precursor of anode materials. [ABSTRACT FROM AUTHOR]