Journal
JOURNAL OF ENERGY CHEMISTRY
Volume 63, Issue -, Pages 312-319Publisher
ELSEVIER
DOI: 10.1016/j.jechem.2021.07.029
Keywords
Lithium-ion battery; Concentration gradient; Nickel-rich cathode; Surface coating; Yttrium oxide
Funding
- National Key R&D Program of China [2016YFA0202503]
- SINOPEC Project [129015-1]
- National Natural Science Foundation of China [21835004, 21925503]
- 111 Project from the Ministry of Education of China [B12015]
- Fundamental Research Funds for the Central Universities
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Rationally designed LiNiO2 with concentration-gradient yttrium modification shows alleviative side reactions and improved electrochemical performance, forming a protective cathode electrolyte interface, indicating a promising approach to stabilize nickel-rich cathode materials.
Lithium nickel oxide (LiNiO2) cathode materials are featured with high capacity and low cost for rechargeable lithium-ion batteries but suffer from severe interface and structure instability. Here we report that rationally designed LiNiO2 via concentration-gradient yttrium modification exhibits alleviative side reactions and improved electrochemical performance. The LiNiO2 cathode with LiYO2-Y2O3 coating layer delivers a discharge capacity of 225 mAh g(-1) with a high initial Coulombic efficiency of 93.4%. These improvements can be attributed to the formation of in-situ modified hybrid LiYO2-Y2O3 coating layer, which suppresses phase transformation, electrolyte oxidation and salt dissociation due to the formation of protective cathode electrolyte interface. The results indicate promising application of concentration-gradient yttrium coating as a facile approach to stabilize nickel-rich cathode materials. (C) 2021 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by ELSEVIER B.V. and Science Press. All rights reserved.
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