Preparation of spherical spinel LiCr0.04Mn1.96O4 cathode materials based on the slurry spray drying method
来源期刊：Rare Metals2009年第6期
论文作者：JIANG Qinglai, HU Guorong, PENG Zhongdong, DU Ke, CAO Yanbing, and TANG Daichun School of Metallurgical Science and Engineering, Central South University, Changsha , China
文章页码：618 - 623
摘 要：Regular spherical chromium doped spinel lithium manganese oxides （LiCr0.04Mn1.96O4） with an average particle size of about 20 μm were prepared by the slurry spray drying process. The materials were compared with non-spherical LiCr0.04Mn1.96O4 materials prepared by the common drying process, and all materials were characterized by X-ray diffraction （XRD）, scanning electron microscopy （SEM）, laser particle analyzer and Brunauer-Emmett-Teller （BET） specific surface area test. Electrochemical performances of these cathode materials were studied by cyclic voltammetry （CV）, electrochemical impedance spectroscopy （EIS） and Li/LiCr0.04Mn1.96O4 battery test. The results show that the spherical active material is single spinel structure, compact, and with narrow particle size distribution and low BET specific surface area. Compared with the non-spherical material, the spherical material prepared by the spray drying process shows a lower electrochemical impedance, a fewer electrochemical polarization and a better charge/discharge rate capability and capacity retention at elevated temperatures.
JIANG Qinglai, HU Guorong, PENG Zhongdong, DU Ke, CAO Yanbing, and TANG Daichun School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China
摘 要：Regular spherical chromium doped spinel lithium manganese oxides （LiCr0.04Mn1.96O4） with an average particle size of about 20 μm were prepared by the slurry spray drying process. The materials were compared with non-spherical LiCr0.04Mn1.96O4 materials prepared by the common drying process, and all materials were characterized by X-ray diffraction （XRD）, scanning electron microscopy （SEM）, laser particle analyzer and Brunauer-Emmett-Teller （BET） specific surface area test. Electrochemical performances of these cathode materials were studied by cyclic voltammetry （CV）, electrochemical impedance spectroscopy （EIS） and Li/LiCr0.04Mn1.96O4 battery test. The results show that the spherical active material is single spinel structure, compact, and with narrow particle size distribution and low BET specific surface area. Compared with the non-spherical material, the spherical material prepared by the spray drying process shows a lower electrochemical impedance, a fewer electrochemical polarization and a better charge/discharge rate capability and capacity retention at elevated temperatures.
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