Shan, W., Zhang, H., Hu, C., Zhou, Y., Lam, K.-h. , Wang, S. and Hou, X. (2021) The cycle performance of high nickel cathode materials significantly enhanced by the LiAlO2@Al2O3 dual-modified coating. Electrochimica Acta, 367, 137216. (doi: 10.1016/j.electacta.2020.137216)
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Abstract
The degradation of interface and crystal structure during the cycle seriously hinders the further development and application of high-nickel cathode materials. In order to solve this problem, we synthesize a Al2O3 modified coating on LiNi0.88Co0.09Al0.03O2 (NCA) cathode material particles. However, further research discovers that the coating is not composed of a single Al2O3 as previously reported. On the contrary, a part of Al2O3 in the inner layer of the coating near the host material may be induced to form a thin layer of LiAlO2 on the surface of the NCA, while the outer layer of the coating is still composed of Al2O3. This LiAlO2@Al2O3 dual-modified coating reveals a new surface coating structure. And the results show that the NCA material coated with the appropriate thickness of the coating has a first charge/discharge capacity of 242.1/210.3 mAh g−1 at a current density of 0.1 C (20 mA g−1). When the current density is increased to 1.0 C (200 mA g−1), the capacity retention rate is still 82.8% (62.6% of the pristine material) after 100 cycles. Even at a current density of 2.0 C, the discharge capacity is still 189.2 mAh g−1, which shows its better rate performance. The cycle performance and the capacity retention of materials at high currents are significantly improved. The study finds that LiAlO2@Al2O3 dual-modified coating has a positive effect on stabilizing the particle surface, resisting attacks from the electrolyte and improving the diffusion performance of Li+, which may be the reasons for the enhanced cycle stability and capacity retention of the material.
| Item Type: | Articles |
|---|---|
| Status: | Published |
| Refereed: | Yes |
| Glasgow Author(s) Enlighten ID: | Lam, Dr Koko |
| Creator Roles: | |
| Authors: | Shan, W., Zhang, H., Hu, C., Zhou, Y., Lam, K.-h., Wang, S., and Hou, X. |
| College/School: | College of Science and Engineering > School of Engineering > Systems Power and Energy |
| Journal Name: | Electrochimica Acta |
| Publisher: | Elsevier |
| ISSN: | 0013-4686 |
| ISSN (Online): | 1873-3859 |
| Published Online: | 15 October 2020 |
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