Abstract
High voltage LiNi0·5Mn1·5O4 and Li1·1Ni0·5Mn1·4O4 spinels are prepared by a novel solution combustion method at 600°C for 4 h. Although the phase composition, ordered structure, micromorphology and the amount of Mn3+ of the products with or without Li+ doping are similar, Li1·1Ni0·5Mn1·4O4 with Li+ doping shows superior rate capability. The capacity retention ratio of Li1·1Ni0·5Mn1·4O4 with Li+ doping takes 46 times as much as that without Li+ doping at 5 C rate, and the polarisation of Li1·1Ni0·5Mn1·4O4 shows smaller number as well. It suggests that doping Li+ is more effective and promising for improving the rate capability of LiNi0·5Mn1·5O4 by solution combustion method.
Acknowledgements
The present work was supported by the National Natural Science Foundation of China (grant nos. 51362011 and 51362012), Natural Science Foundation of Yunnan Province (grant no. 2012FB173), the Chemistry Discipline Master's Site Construction Open Foundation of Honghe University of Yunnan Province (grant no. HXZ1309) and Innovation and Entrepreneurship Training Program (grant no. DCXL1319).