In:
ECS Meeting Abstracts, The Electrochemical Society, Vol. MA2019-01, No. 2 ( 2019-05-01), p. 306-306
Kurzfassung:
Ni-rich lithium nickel manganese cobalt oxides (LiNi x Mn y Co 1-x-y O 2 , x≥ 0.5, NMCs) are low cost and high capacity cathode materials for Li-ion batteries. However, various issues (i.e. transition metal dissolution, structural disordering, particle cracking, surface film thickening, etc.) hinder their cycling stability under high cut-off potentials. The mechanisms of these performance degradations have already been investigated in the battery research community. Interestingly, these phenomena were primarily observed at the surface layer of the cathode material, implying that they may also be facilitated by some interfacial parasitic reactions between the delithiated NMC electrode and the non-aqueous electrolyte [1] . In this study, LiNi 0.6 Mn 0.2 Co 0.2 O 2 (NMC 622) electrodes modified with TiO 2 via atomic layer deposition (ALD) were used as a model system to demonstrate the criticalness of the interfacial parasitic reactions. The suppression of the interfacial parasitic reactions effectively reduced the resistance of cathodic surface films, inhibited the dissolution of transition metals, lowered the particle fragmentation, and mitigated the cation mixing of NMC 622. All these results demonstrated that minimizing the interfacial parasitic reactions is a key approach to improve the durability and stability of Ni-rich NMCs under high-voltage cycling. Zeng, X.; Xu, G.-L.; Li, Y.; Luo, X.; Maglia, F.; Bauer, C.; Lux, S. F.; Paschos, O.; Kim, S.-J.; Lamp, P.; Lu, J.; Amine, K.; Chen, Z., Kinetic Study of Parasitic Reactions in Lithium-Ion Batteries: A Case Study on LiNi0.6Mn0.2Co0.2O2. ACS Appl. Mater. Interfaces 2016, 8 (5), 3446-3451. Figure 1
Materialart:
Online-Ressource
ISSN:
2151-2043
DOI:
10.1149/MA2019-01/2/306
Sprache:
Unbekannt
Verlag:
The Electrochemical Society
Publikationsdatum:
2019
ZDB Id:
2438749-6
Permalink