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Chinese Journal of Rare Metals. 2014, (06) Core

Synthesis and Electrochemical Performance of Isopropyl Alchol（ IPA） Assisted Al2O3 Coated LiMn2O4 at Elevated TemperatureChinese Full Text

Zhang Yannan;Zhang Yingjie;Dong Peng;Xia Shubiao;Yang Ruiming;Faculty of Materials Science and Engineering,Kunming University of Science and Technology;

Abstract: A series of spinel Li Mn2O4 coated with 2% Al2O3 were synthesized by Al2（ SO4）3and isopropyl alcohol（ IPA） assisted sol-gel process. The morphologies of the as-prepared materials were characterized by field emission scanning electron microscopy（ FESEM）. The results showed that Al2O3 particles uniformly distributed on the surface of the spinel Li Mn2O4 prepared by IPA assisted process. Galvanostatic charge-discharge test indicated that the IPA-assisted coating could significantly improve the cycle stability of spinel Li Mn2O4 at elevated temperature. The capacity retention of the Al2O3-IPA-coated Li Mn2O4 as cathode material was 87. 3% after100 cycles（ condition: 3. 0 4. 5 V,1C,55 ℃）,Which was considerably higher than the value of 82. 2% for the coated Li Mn2O4 prepared without IPA assisted process and 74. 1% for the uncoated one. Tests with different discharge rates showed that the Al2O3-IPA-coated Li Mn2O4 produced excellent rate capability: 102. 1 m Ah·g- 1at 5C and 91. 0 m Ah·g- 1at 10 C. After the storage at 55 ℃for 20 d,the Mn dissolution from the spinel samples was tested by inductive coupled plasma emission spectrometer（ ICP）. The solubility of Mn for Al2O3-IPA-coated Li Mn2O4 was only 58. 71 × 10- 6,which was much lower than that for the ones without IPA assisted process and uncoated.
Keywords：

isopropyl alcohol; spinel LiMn2O4; coating; capacity retention;

  • DOI：

    10.13373/j.cnki.cjrm.2014.06.015

  • Series：

  • Subject：

  • Classification Code：

    O611.4;O646

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