Capacity Fading of Ni-Rich NCA Cathodes: Effect of Microcracking Extent
By G. Nam, Nam-Yung Park, Kang‐Joon Park, Jihui Yang, Jun Liu, Chong Seung Yoon, Yang‐Kook Sun. ACS Energy Letters, 2019
410 citations recorded by the source corpus.
Ni-rich Li[Ni1–x–yCoxAly]O2 (NCA) cathodes (1 – x – y = 0.8, 0.88, and 0.95) are synthesized to investigate the capacity fading mechanism of Ni-rich NCA cathodes. The capacity retention and thermal property of the cathodes deteriorate as their discharge capacity increases when the Ni fraction is increased. The capacity fading correlates well with the anisotropic volume variations caused by the H2–H3 phase transition and the resulting extent of microcracking. Although all three cathodes start to develop microcracks after being charged to 3.9 V, the potential at which microcracks propagated to the outer surface of the particle decreases with increasing Ni content. These microcracks undermine the mechanical integrity of the cathode and facilitate electrolyte penetration into the particle core, which accelerates surface degradation of the internal primary particles. Therefore, mitigating or delaying the H2–H3 phase transition is key to improving the cycling performance of Ni-rich NCA cathodes.
Subfields: Electrical and Electronic Engineering, Electronic, Optical and Magnetic Materials
View Paper: https://www.semanticscholar.org/paper/a6ddfff4062635254cf2d18dafffd3d2eaa8bad0
How researchers see this paper
The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.
In Electrical and Electronic Engineering
Citations in the corpus
- A review of the degradation mechanisms of NCM cathodes and corresponding mitigation strategies (2023, background): “Whereas the material with the highest amount of Ni (NCA95) shows complete particle degradation after 1000 cycles and capacity retention of 17.5%.”