Preparation of spherical spinel LiCr_(0.04)Mn_(1.96)O_4 cathode materials based on the slurry spray drying method

稀有金属（英文版）, 2009, 25(6): 618-623. doi: 10.1007/s12598-009-0118-z

^1, , ^2, , ^3, , ^4, , ^5, , ^6,

1.School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China

2.School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China

3.School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China

4.School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China

5.School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China

6.School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China

基金项目: the National High-Tech Research and Development Program of China(2006AA11A160)

Preparation of spherical spinel LiCr_(0.04)Mn_(1.96)O_4 cathode materials based on the slurry spray drying method

JIANG Qinglai ^1, , HU Guorong ^2, , PENG Zhongdong ^3, , DU Ke ^4, , CAO Yanbing ^5, , TANG Daichun ^6,

1.School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China

2.School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China

3.School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China

4.School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China

5.School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China

6.School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China

Keywords： lithium-ion battery

Regular spherical chromium doped spinel lithium manganese oxides (LiCr_(0.04)Mn_(1.96)O_4) with an average particle size of about 20 μm were prepared by the slurry spray drying process. The materials were compared with non-spherical LiCr_(0.04)Mn_(1.96)O_4 materials prepared by the common drying process, and all materials were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), laser parti-cle 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/LiCr_(0.04)Mn_(1.96)O_4 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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Preparation of spherical spinel LiCr_(0.04)Mn_(1.96)O_4 cathode materials based on the slurry spray drying method

参考文献