Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5438036 | Ceramics International | 2017 | 22 Pages |
Abstract
In this work, Sn is used to dope the Li-rich cathode material to improve the electrochemical performance of Li ion battery. After Sn treatment, the lattice parameters a, c and lattice volume V become larger. Compared with the pristine sample, the Sn-contained samples show longer plateaux at about 4.5Â V in the first charging process, which means that Sn can activate the Li2MnO3 component. Meanwhile, with appropriate content of Sn doping, the sample exhibits enhanced rate capability and cycling stability. Especially, the sample S10 shows the best electrochemical performance, with a capacity retention of 88.66% after 100 cycles at 1Â C (1Â C=250Â mAÂ gâ1). The mechanisms of Sn doping have also been investigated. The increased activation of Li2MnO3 is due to the improved conductivity of Li2MnO3 phase by Sn doping, and the enhanced electrochemical performance is mainly ascribed to the increased ability of Li ion diffusing into bulk phase and the improved structure stability during the prolonged charge-discharge cycles. It is suggested that Sn doping is an effective way to improve the electrochemical performance of Li-rich cathode material.
Keywords
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Hao Chen, Qiyang Hu, Wenjie Peng, Huajun Guo, Guochun Yan, Xianwen Wu,