Qiufen Wang

Li2SiO3@Li4Ti5O12 nanocomposites as anode material for lithium-ion batteries

Li2SiO3@Li4Ti5O12 nanocomposites have been synthesized via a hydrothermal route and sintering. The structure, morphology and electrochemical properties of the composites were studied by means of X-ray diffraction, scanning electron microscope, transmission electron microscopy, X-ray photoelectron spectrometer and electrochemical measurements. The Li2SiO3@Li4Ti5O12 nanospheres with an average diameter of 50 nm are connected to each other to form the irregular and particulate matter shape. When 300 mg of silicon is doped, Li2SiO3@Li4Ti5O12 nanocomposites exhibit a high initial discharge capacities (709.5 mA h g−1) and reversible capacity (225 mA h g−1 after 50 cycles) at the current density of 100 mA g−1 due to the synergy effect between LTO nanosphere and Li2SiO3.

Synthesis and electrochemical performances of cotton ball-like SnS2 compound as anode material for lithium ion batteries

The cotton ball-like SnS2 compound has been synthesised by a hydrothermal method. The structure, morphology and electrochemical performances of the as prepared materials are characterised by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, energy dispersive spectroscopy and electrochemical measurements. Results show that the SnS2 compound exhibits three-dimensional cotton ball-like structures. The particle size of every petal displays the ranges from 100 to 200 nm. When the cell potential window is set between 0.01 and 2.0 V versus Li+/Li at the rate of 0.1 C, the initial discharge and charge capacities of SnS2 are much higher than those of commercial graphite.