Effect of Niobium Doping on Structural Stability and Electrochemical Properties of LiNiO2 Cathode for Li-Ion Batteries
| Autor: | Guo-Xin Huang, Ruo-Heng Wang, Xiao-Yan Lv, Jing Su, Yun-Fei Long, Zu-Zeng Qin, Yan-Xuan Wen |
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| Rok vydání: | 2022 |
| Předmět: | |
| Zdroj: | Journal of The Electrochemical Society. 169:040533 |
| ISSN: | 1945-7111 0013-4651 |
| DOI: | 10.1149/1945-7111/ac653e |
| Popis: | LiNiO2, a promising cobalt-free cathode, suffers from poor cyclic stability and inferior rate performance due to structural degradation. A strategy based on the synergistic effect of a strong Nb–O bond (753 kJ mol−1), high valence state (Nb5+), and larger ionic radius (0.64 Å) was developed to improve the properties of LiNiO2. The synergistic effects can effectively improve lattice stability, lower Li+/Ni2+ cation mixing, expand LiO6-slab spaces, enhance the conductivity and inhibit the H2–H3 phase transition, which can enhance the stability of the layered structure, accelerate Li+ diffusion and alleviate mechanical damage. Therefore, LiN0.99Nb0.01O2 exhibits higher capacity retention (91.4% after 100 cycles at 0.5C) and superior rate capability (143 mAh g−1 at 5C). As a comparison, the data of bare LiNiO2 is 69.2% and 127 mAh g−1 under the same conditions. These results further demonstrate the effectiveness of the proposed doping strategy. |
| Databáze: | OpenAIRE |
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