Xiangxi Ores and New Materials Research and Service Center

Qianzhou, China

Xiangxi Ores and New Materials Research and Service Center

Qianzhou, China

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Wu X.,JiShou University | Wu X.,Xiangxi Ores and New Materials Research and Service Center | Xiao Z.,JiShou University | Ma M.,JiShou University | And 2 more authors.
Kuei Suan Jen Hsueh Pao/Journal of the Chinese Ceramic Society | Year: 2011

Li1.3Al0.3Ti1.7 (PO4)3 powder were synthesized by sol-gel method, and then Li1.3Al0.3Ti1.7 (PO4)3 pellets added with different mole fraction of LiBO2 flux were prepared via sintering at 900°C for 2 h. The phase composition, surface morphology of Li1.3Al0.3Ti1.7 (PO4)3 pellet were analyzed by X-ray diffraction, scanning electron microscopy, and the oxidation-reduction electric potential, ionic conductivity and activation energy of the pellets were investigated via cyclic voltammetry and electrochemical impedance spectroscopy. The results show that all the Li1.3Al0.3Ti1.7 (PO4)3 pellet samples sintered with different mole fractions of LiBO2 have similar phase structure. The sintered pellet becomes denser, and the boundary and corner of the particles become illegible with the increase of LiBO2. The addition of LiBO2 has little effect on the oxidation-reduction electric potential of Li1.3Al0.3Ti1.7 (PO3)4. Among the Li1.3Al0.3Ti1.7 (PO3)4 pellet samples sintered with different mole fractions of LiBO2, the one sample sintered with 1% LiBO2 shows the highest ionic conductivity of 3.95 × 10-4 S/cm and the lowest ctivation energy of 0.246 9 eV.


Wu X.M.,JiShou University | Wu X.M.,Xiangxi Ores and New Materials Research and Service Center | Liu J.L.,JiShou University | Chen S.,JiShou University | And 3 more authors.
Ionics | Year: 2010

Solid electrolyte Li1.3Al0.3Ti1.7(PO4)3 was prepared by sol-gel method under different sintering conditions. The structural identification, surface morphology, electrochemical window, ionic conductivity, and activation energy of the Li1.3Al0.3Ti1.7(PO4)3 sintered pellets were investigated by X-ray diffraction, scanning electron microscopy, cyclic voltammetry, and electrochemical impedance spectroscopy. It is found that the sintering temperature and time have considerable effect on the properties of the Li1.3Al0.3Ti1.7(PO4)3 sintered pellets. The Li1.3Al0.3Ti1.7(PO4)3 pellet sintered at 900 °C for 2 h is denser than the pellets sintered at other conditions. Different sintering conditions result in the sintered pellet with different porosity. However, the sintering conditions have little effect on the electrochemical window of Li1. 3Al0.3Ti1.7(PO4)3. Among the Li1.3Al0.3Ti1.7(PO4)3 pellets sintered at various conditions, the pellet sintered at 900 °C for 2 h shows the highest ionic conductivity of 3.46 × 10-4 S cm-1 and the lowest activation energy of 0.2821 eV. © 2010 Springer-Verlag.


Wu X.M.,JiShou University | Wu X.M.,Xiangxi Ores and New Materials Research and Service Center | Chen S.,JiShou University | Chen S.,Xiangxi Ores and New Materials Research and Service Center | And 2 more authors.
Ionics | Year: 2011

Co-coated LiMn2O4 was synthesized by electroless plating. The phase identification, surface morphology, and electrochemical properties of the synthesized powders were studied by X-ray diffraction, scanning electron microscopy, electrochemical impedance spectroscopy, and galvanostatic charge-discharge experiments, respectively. The result shows that Co-coated LiMn2O4 particle has a coarse surface with a lot of holes. The specific capacity of Co-coated LiMn2O4 is 118 mAhg-1, which is a bit less than 123 mAh g-1 for the uncoated LiMn2O4. The capacity retention of Co-coated LiMn2O4 is 11% higher than the uncoated LiMn2O4 when the electrode is cycled at room temperature for 20 times. When cycled at the temperature of 55 °C, the capacity retention of Co-coated LiMn2O4 becomes 15% higher than the uncoated one. © 2010 Springer-Verlag.


Wu X.M.,JiShou University | Wu X.M.,Xiangxi Ores and New Materials Research and Service Center | Liu J.L.,JiShou University | Li R.X.,JiShou University | And 3 more authors.
Russian Journal of Electrochemistry | Year: 2011

Solid-state thin-film lithium-ion battery of LiMn2O 4/Li1.3Al0.3Ti1.7(PO 4)3/LiMn2O4 is prepared by spray technique using Li1.3Al0.3Ti1.7(PO 4)3 sintered pellet as both electrolyte and substrate. The thin-film battery is heat-treated by rapid thermal annealing. Phase identification, morphology and electrochemical properties of the sintered pellets and thin-film battery are investigated by X-ray diffraction, scanning electron microscopy, electrochemical impedance spectroscopy, cyclic voltammetry, and galvanostatic charge-discharge experiments, respectively. The results show that LiMn2O4 films with some pores are well deposited on the surface of Li1.3Al0.3Ti1.7(PO 4)3 sintered pellet. The discharge current density and temperature have considerable effect on discharge capacity of the thin-film battery. LiMn2O4/Li1.3Al0.3Ti 1.7(PO4)3/LiMn2O4 thin-film battery can be easily cycled with a capacity loss of 0.213% per cycle when 50 cycles are carried out. © 2011 Pleiades Publishing, Ltd.

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