Revisiting the relevance of using a constant voltage step to improve electrochemical performances of Li-rich lamellar oxides
| Autor: | Pierre-Emmanuel Petit, Erik Elkaïm, Maria Theresa Caldes, Alexandre Pradon, Guy Ouvrard, Erwan Dumont, C. La Fontaine, Cécile Tessier |
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| Přispěvatelé: | Synchrotron SOLEIL (SSOLEIL), Centre National de la Recherche Scientifique (CNRS), Division Métaux, Armatures et Câbles pour Ouvrages d'art (LCPC/MACOA), Laboratoire Central des Ponts et Chaussées (LCPC)-PRES Université Nantes Angers Le Mans (UNAM), Institut des Matériaux Jean Rouxel (IMN), Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST), Université de Nantes (UN)-Université de Nantes (UN)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Ecole Polytechnique de l'Université de Nantes (EPUN), Université de Nantes (UN)-Université de Nantes (UN), Centre d'Etudes et d'Expertise sur les Risques, l'Environnement, la Mobilité et l'Aménagement - Direction Ile-de-France (Cerema Direction Ile-de-France), Centre d'Etudes et d'Expertise sur les Risques, l'Environnement, la Mobilité et l'Aménagement (Cerema) |
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Materials science
Renewable Energy Sustainability and the Environment Analytical chemistry Oxide Energy Engineering and Power Technology chemistry.chemical_element 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry 01 natural sciences Lithium battery 0104 chemical sciences chemistry.chemical_compound chemistry Electrode [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci] Lamellar structure Lithium Electrical and Electronic Engineering Physical and Theoretical Chemistry 0210 nano-technology High-resolution transmission electron microscopy ComputingMilieux_MISCELLANEOUS Voltage |
| Zdroj: | Journal of Power Sources Journal of Power Sources, Elsevier, 2018, 380, pp.158-163. ⟨10.1016/j.jpowsour.2017.12.084⟩ |
| ISSN: | 0378-7753 1873-2755 |
| Popis: | A Li-rich lamellar oxide was cycled at high potential and the relevance of using a constant voltage step (CVS) at the end of the charge, needed for industrial application, was investigated by electrochemical performance, X-ray diffraction (XRD) and high resolution transmission electron microscopy (HRTEM). Electrochemical studies at 4.7 and 4.5 V with and without CVS showed that capacity and voltage fading occurred mostly when cells operated at high potential. After cycling, 3D-type defects involving transition metals trapped in lithium layer were observed by HRTEM into the electrode bulk. These defects are responsible for the voltage fading. XRD microstrain parameter was used to evaluate defects rate in aged materials subjected to a CVS, showing more 3D-type defects when cycled at 4.7 V than at 4.5 V. The time spent at high potential at the end of the charge as well as the value of the upper potential limit, are both relevant parameters to voltage decay. The use of a CVS at the end of the charge needs at the same time, a reduced upper potential window in order to minimize 3D-type defects occurrence. Unfortunately, this approach is still not sufficient to prevent voltage fading. |
| Databáze: | OpenAIRE |
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