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Thermionic energy conversion is a process by which thermal energy is transformed into electrical energy directly without the intermediate steps. Microstructure of Chemical Vapor Transport Deposited (CVTD) single crystal tungsten coating working at 1600°C for 1000 h was investigated using optical microscopy and electron backscatter diffraction (EBSD) technique. The experimental results showed that the etching morphology of single crystal tungsten coating was not clear compared to the etching morphology before working. The electro-etched surface of single crystal tungsten coating mainly consist of {110} crystal planes and {112} crystal planes before working at 1600°C. The surface of the single crystal tungsten coating mainly consists of near {110} crystal planes and near {112} crystal planes instead after working at 1600°C.

A safe lithium-ion battery system of Li4Ti5O12/LiFePO4 was prepared, the solid electrolyte interface on the surface of Li4Ti5O12 electrode and the electrochemical performances of this lithium-ion battery system were studied. XRD、SEM and EIS texts were used to analyses the solid electrolyte interface on the surface of anode electrode. The result of XRD indicates that new material does generate at the surface of Li4Ti5O12 anode electrode. The result of EIS indicates that the SEI film increased the resistance of the battery, and the resistance will decrease as the cycle time increasing.

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