Retraction notice to “Optimal variable estimation of a Li-ion battery model by fractional calculus and bio-inspired algorithms” [J. Energy Storage 54 (2022) 105323] (Journal of Energy Storage (2022) 54, (S2352152X22013202), (10.1016/j.est.2022.105323))

This article has been retracted: please see Elsevier Policy on Article Withdrawal (https://www.elsevier.com/locate/withdrawalpolicy). This article has been retracted at the request of the Editor-in-Chief. In investigating concerns regarding authorship for sale in this article, the Editor reached out to the authors for an explanation but they failed to respond. Post-publication, the Editor also discovered suspicious email addresses used by the author during the submission process that was associated with multiple researcher accounts. The Editor has determined that the authorship of the paper cannot be relied upon, and the article needs to be retracted.