Improvement in rate capability of lithium-rich cathode material Li[Li0.2Ni0.13Co0.13Mn0.54]O2 by Mo substitution

• Published in: Ionics 2016-08, Vol.22 (8), p.1369-1376
• Main Authors: Jin, Xue, Xu, Qunjie, Liu, Xinnuan, Yuan, Xiaolei, Liu, Haimei
• Format: Article
• Language: English
• Subjects: Chemistry; Chemistry and Materials Science; Condensed Matter Physics; Electrochemistry; Energy Storage; Optical and Electronic Materials; Original Paper; Renewable and Green Energy
• ISSN: 0947-7047; 1862-0760
• DOI: 10.1007/s11581-016-1675-4

Lithium-rich cathode material Li[Li 0.2 Ni 0.13 Co 0.13 Mn 0.54 ]O 2 doped with trace Mo is successfully synthesized by a sol-gel method. The X-ray diffraction patterns show that trace Mo substitution increases the inter-layer space of the material, of which is benefiting to lithium ion insertion/extraction among the electrode materials. The (CV) tests demonstrate the decrease of polarization, and on the other hand, the lithium ion diffusion coefficient ( D Li ) of the modified material turns out to be larger, which indicates a faster electrochemical process. As a result, the Mo doped material possesses high rate performance and good cycling stability, and the initial discharge capacity reaches 149.3 mAh g −1 at a current density of 5.0 °C, and the residual capacity is 144.0 mAh g −1 after 50 cycles with capacity retention of 96.5 % in the potential range of 2.0–4.8 V at room temperature.