标题：Enhanced electrochemical properties of LiMn2O4cathode material coated by 5 wt.% of nano-La2O3
作者：Feng, Lijun ;Wang, Shuping ;Han, Lu ;Qin, Xuyang ;Wei, Huiying ;Yang, Yanzhao
作者机构：[Feng, Lijun ;Wang, Shuping ;Han, Lu ;Qin, Xuyang ;Wei, Huiying ;Yang, Yanzhao ] Key Laboratory for Special Functional Aggregated Materials of Educati 更多
摘要：Spinel LiMn2O4was synthesized by solid state reaction. 5.0 wt.% of La2O3was coated on the surface of LiMn2O4via ball-milling method, followed by calcination at 650°C for 5 h in the air. The uncoated and La2O3-coated LiMn2O4materials were physically characterized using X-ray diffraction, scanning electron microscopy, transmission electron microscopy, Brunauer-Emmett-Teller surface area measurements. It was observed that Li/LiMn2O4electrode obtained the capacity retention of 76.7% after 205 cycles at 1 C rate at 25°C while that of the coated sample was 90.1%. At 55°C, the bare and coated LiMn2O4showed a capacity retention of 69.4% and 82.6% after 95 cycles, respectively. Rate capability was also improved. The capacity retention of uncoated and La2O3-coated materials reduced to 46.9% and 80.3% at 10 C-rate, respectively. © 2012 Elsevier B.V. All rights reserved.