2026-05-30T17:22:34Zhttps://riubu.ubu.es/oai/request

oai:riubu.ubu.es:10259/74062023-03-27T08:16:38Zcom_10259_5822com_10259_5086com_10259_2604col_10259_5823

00925njm 22002777a 4500 dc García-Quismondo, Enrique author Alvarez-Conde, Sandra author García, Guzmán author Medina-Santos, Jesús I. author Palma, Jesús author Ventosa Arbaizar, Edgar author 2022-09 The formation of a protecting nanolayer, so-called solid electrolyte interphase (SEI), on the negative electrode of Li-ion batteries (LIBs) from product precipitation of the cathodic decomposition of the electrolyte is a blessing since the electrically insulating nature of this nanolayer protects the electrode surface, preventing continuous electrolyte decomposition and enabling the large nominal cell voltage of LIBs, e.g., 3.3−3.8 V. Thus, the protection performance of the nanolayer SEI is essential for LIBs to achieve a long cycle life. Unfortunately, the evaluation of this critical property of the SEI is not trivial. Herein, a new, cheap, and easily implementable methodology, the redox-mediated enhanced coulometry, is presented to estimate the protecting quality of the SEI. The key element of the methodology is the addition of a redox mediator in the electrolyte during the degassing step (after the SEI formation cycle). The redox mediator leads to an internal self-discharge process that is inversely proportional to the protecting character of the SEI. Also, the self-discharge process results in an easily measurable decrease in Coulombic efficiency. The influence of vinylene carbonate as an electrolyte additive in the resulting SEI is used as a case study to showcase the potential of the proposed methodology. 1944-8244 http://hdl.handle.net/10259/7406 10.1021/acsami.2c11992 1944-8252 Cycle life Solid electrolyte interphase (SEI) Protecting character Coulometry method Redox mediator New Technique for Probing the Protecting Character of the Solid Electrolyte Interphase as a Critical but Elusive Property for Pursuing Long Cycle Life Lithium-Ion Batteries