Towards understanding the functional mechanism and synergistic effects of LiMn2O4 - LiNi0.5Mn0.3Co0.2O2 blended positive electrodes for Lithium-ion batteries
Chatzogiannakis, Dimitrios (Centro de Investigación Cooperativa de Energías Alternativas)
Fehse, Marcus (Centro de Investigación Cooperativa de Energías Alternativas)
Cabañero, Maria Angeles (FEV Iberia SL)
Romano, Natalia (Centro de Investigación Cooperativa de Energías Alternativas)
Black, Ashley (Institut de Ciència de Materials de Barcelona)
Saurel, Damien (Centro de Investigación Cooperativa de Energías Alternativas)
Palacín, M. Rosa (Institut de Ciència de Materials de Barcelona)
Casas-Cabanas, Montse (Ikerbasque)

Date:	2024
Abstract:	Blended positive electrodes consisting of mixtures of LiMnO spinel (LMO) and layered LiNiMnCoO (NMC) have been studied by coupling electrochemical testing to operando synchrotron based X-ray absorption and powder diffraction experiments to shed light on their redox mechanism. Blending NMC with LMO results in enhanced energy density at high rates, with the composition with 25% LMO exhibiting the best electrochemical performance. Tests with a special electrochemical setup detecting the contribution of each blend component indicate that the effective current load on each blend component can be significantly different from the nominal rate and also varies as function of SoC. Operando studies enabled to monitor the evolution of oxidation state and changes in the crystal structure, which are in agreement with the expected behaviour of the individual components considering the material specific electrochemical current loads. These findings should contribute to a deeper mechanistic understanding of blended electrodes to foster a rational driven approach for their design.
Grants:	European Commission 945357 Agencia Estatal de Investigación PID2020-113805GB-I00 Agencia Estatal de Investigación CEX2019-000917-S
Rights:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, i la comunicació pública de l'obra, sempre que no sigui amb finalitats comercials, i sempre que es reconegui l'autoria de l'obra original. No es permet la creació d'obres derivades.
Language:	Anglès
Document:	Article ; recerca ; Versió publicada
Subject:	Blend electrodes ; LMO-NMC ; Operando XAS ; Operando XRD
Published in:	Journal of power sources, Vol. 591 (January 2024) , art. 233804, ISSN 0378-7753

DOI: 10.1016/j.jpowsour.2023.233804

9 p, 2.4 MB

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