Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5461392 | Journal of Alloys and Compounds | 2017 | 6 Pages |
Abstract
LiNi0.5Mn1.5O4 spinel samples are synthesized through a citric acid method using either microwave heating or oven heating to prepare the precursor gel. Contrast to the oven heating, the microwave heating is a fast way to obtain a homogenous precursor gel and remove all the crystal water with a higher heating temperature. The product synthesized with this method is of different fine structure and higher purity of LiNi0.5Mn1.5O4. As a result, the LiNi0.5Mn1.5O4 obtained from microwave heating shows better rate performance with a high capacity of about 122Â mAh gâ1 at 10C, which is 92% of the capacity at 1C (131Â mAh gâ1). The cycling performance of this product at the rate of 1C is also impressive with about 95% of its initial capacity retained after 200 cycles (125Â mAh gâ1). When the current increases to 10C rate, the cycling performance becomes worse due to the increase in impedance during cycling. At the same time, part of the sample is over-discharged and transformed to a tetragonal phase at a high discharge current of 10C and become electrochemical irreversible, resulting to the capacity loss. The energy density (521Â Wh/kg) of the microwave assist sample is also pretty high at high rate of 10C, due to the good rate performance.
Keywords
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Xu-Yong Feng, Chen Shen, Hong-Fa Xiang, Han-Kang Liu, Yu-Cheng Wu, Chun-Hua Chen,