Stabilizing high temperature operation and calendar life of LiNi0.5Mn1.5O4
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Le résumé fourni par la source
Severe capacity degradation at high operating voltages and poor interphase stability at elevated temperature have thus far precluded the practical application of LiNi0.5Mn1.5O4 (LNMO) as a cathode material for lithium-ion batteries. Addressing these challenges through a combination of experimental and theoretical methods in this work, we demonstrate how a fluorinated carbonate electrolyte enables both high-voltage and high temperature operation by mitigating the traditional interfacial reactions observed in electrolytes with conventional carbonate solvents. Computational studies confirm the exceptional oxidation stability of fluorinated carbonate electrolyte which reduces deprotonation at high voltage. The mitigated deprotonation will then minimize the formation of HF acid which corrodes the LNMO surface and leads to phase transformation and poor interphases. With fluorinated carbonate electrolyte at elevated temperature, it was found on LNMO’s subsurface a reduced amount of Mn3O4 phase which can block Li+ transfer and result in drastic cell failure. Leveraging this approach, LNMO/graphite full cells with a high loading of 3.0 mAh/cm2 achieve excellent cycling stability, retaining ∼84 % of their initial capacity at room temperature (25 °C) after 200 cycles and ∼68 % after 100 cycles at 55 °C. This advanced electrolyte also shows promise for improving calendar life, retaining >30 % more capacity than the carbonate baseline after high temperature storage. These results indicate that electrolytes based on fluorinated carbonates are a promising strategy for overcoming the remaining challenges toward practical commercial application of LNMO.
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Le contrôle bibliographique ouvert
DOI retrouvé dans Crossref DOI retrouvé ; titre concordant.
- Titre Crossref
- Stabilizing high temperature operation and calendar life of LiNi0.5Mn1.5O4
- Date Crossref
- 01/07/2024
- Éditeur
- Elsevier BV
- Type
- journal-article
Ce recoupement confirme des métadonnées liées au DOI. Il ne confirme ni la méthode ni les conclusions de l’étude, et il ne compte pas comme une seconde source scientifique indépendante.
Où se fait cette recherche
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University of California San Diego Materials Science and Engineering pays non établi dans la noticeUniversité ou école supérieure
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University of Southern California Center for Advanced Research and Computing pays non établi dans la noticeUniversité ou école supérieure
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DEVCOM Army Research Laboratory Army Research Directorate pays non établi dans la noticeOrganisme public
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United States Army Combat Capabilities Development Command pays non établi dans la noticeInstitution
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University of Chicago pays non établi dans la noticeUniversité ou école supérieure
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Pritzker School of Molecular Engineering pays non établi dans la noticeUniversité ou école supérieure
Materials Science and Engineering — University of California San Diego, Center for Advanced Research and Computing — University of Southern California et Army Research Directorate — DEVCOM Army Research Laboratory, avec 3 autres affiliations.
Une affiliation ne permet pas de déduire la nationalité d’un auteur.