Han Chunhua

Chemical Lithiation and Electroactivity of Nanomaterials

High capacity and good cycling stability of the electrode materials are the key points to develop high-performance lithium ion battery. Based on the latest research over the world, especilly from our group, in this paper we summarized the progress in chemical lithiation and electroactivity of nanomaterials. Firstly, we introduced the preparation of high capacity nanomaterials (molybdenum oxide, vanadium oxides, selenium hydrates, etc) and the chemical problems in lithiation process. Then we summed up the progress in assembly, chemical lithiation and electroactivity of single nanowire devices and nanowire lithium ion battery. Finally, we pointed out that assembly of single nanowire (nanobelts, nanotubes, etc.) device, in situ probe of lithium ion transport, design and construction of ordered array and complex structure, investigation of lithiation mechanism, electrostatic coupling, interface interaction, etc. are effective methods to deeper exploration of the relationship between chemical lithiation and electroactivity of nanomaterials and main directions of nanoscale lithium ion battery research field.

Effect of additive on sulfur-fixation process of sulfur-fixation agent

The crystallization behavior of desulfurization product is directly related to its high-temperature-resistant ability. Effects of the additive on the sulfur-fixation efficiency of the Ba-sulfur-fixation agent and also on the crystallization behavior of the sulfur-fixation product were studied when CaCO3 and BaCO3 were used as the desulfurization agent and MgO and SrCO3 used as the assistant sulfur-fixation agent. The result shows that increase of sulfur-fixation capability for the additive is not owe to their directly react to form sulfate or interact with CaCO3 and BaCO3 to form composite mineral heat-resistant in high temperature, but owe to their activation to sulfur-fixation reaction of the sulfur-fixation agent.

Self-assembling synthesis of vanadium oxide nanotubes and simple determination of the content of V(IV)

High-yielding low-cost vanadium oxide nanotubes were prepared by the hydrothermal self-assembling process from vanadium pentoxide and organic molecules as structure-directing templates. Moreover, a new method was discovered for determining the content of V (IV) in vanadium oxide nanotubes by thermogravimetric analysis (TGA). This method is simple, precise and feasible and can be extended to determine the content of low oxidation state in the other transition metal oxide nanomaterials.