Back to Search
Start Over
Revealing the origin of high-thermal-stability of single-crystal Ni-rich cathodes toward higher-safety batteries.
- Source :
- Nano Energy; Nov2023, Vol. 116, pN.PAG-N.PAG, 1p
- Publication Year :
- 2023
-
Abstract
- The poor thermal stability of Ni-rich cathode materials, resulting in thermal runaway of the battery, is a major safety threat to the development of lithium-ion batteries. However, the thermal degradation mechanism that determines thermal stability, especially for the promising single-crystal (SC) Ni-rich cathode material, has not been elucidated. More importantly, this is indeed a fundamental issue. Herein, via a series of in-situ/ex-situ probing technologies, the thermal degradation of SC Ni-rich material is elaborately diagnosed from surface to bulk phase and compared with polycrystalline (PC) Ni-rich material. A comprehensive oxygen release kinetic model including oxygen diffusion distance, mechanical stress and temperature is presented. This model reveals that the SC Ni-rich material exhibits a stable depth-dependent gradient oxygen release kinetics, while the PC Ni-rich material exhibits an accelerated oxygen release kinetics by grain boundaries, which reveals the origin of the high-thermal-stability of SC Ni-rich cathodes. This work highlights the importance of suppressing oxygen release kinetics (e.g., increase oxygen diffusion distance, increase mechanical stress) to improve thermal stability, facilitating the development of safer lithium-ion batteries based on Ni-rich cathodes. [Display omitted] • Precise probing the thermal degradation process from surface to bulk phase. • A comprehensive kinetic model of oxygen release is proposed. • Single-crystal cathodes exhibit a stable depth-dependent gradient oxygen release kinetics. • Increasing oxygen diffusion distance and mechanical stress can stabilize lattice oxygen. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 22112855
- Volume :
- 116
- Database :
- Supplemental Index
- Journal :
- Nano Energy
- Publication Type :
- Academic Journal
- Accession number :
- 172427874
- Full Text :
- https://doi.org/10.1016/j.nanoen.2023.108846