Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7705771 | International Journal of Hydrogen Energy | 2018 | 11 Pages |
Abstract
In order to improve the rate capability and mitigate the voltage decay of lithium rich layered oxides, chromium doped cathode materials Li1.2[Mn0.54Ni0.13Co0.13]1âxCrxO2 (x = 0,0.003,0.005,0.007) is synthesized via co-precipitation method followed by calcination. As a result, Cr-doped samples present shortened voltage platform at 4.5 V, indicating that the escape of lattice oxygen is suppressed by Cr doping. Among all samples, Li1.2[Mn0.54Ni0.13Co0.13]1âxCrxO2 (x = 0.005) sample shows the greatest rate capability (119.3 mAh gâ1 at 10 C) and the minimum voltage drop (0.6167 V) after 200 cycles at 1.0 C. The reasons for the improved electrochemical performance are the enhanced structural stability, the stronger CrO bond than MnO band and the decreased metal-oxygen covalency induced by Cr doping.
Related Topics
Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
Huimian Li, Huajun Guo, Zhixing Wang, Jiexi Wang, Xinhai Li, Ning Chen, Weihua Gui,