Zhang, H; Song, Z; Yang, K; Zhou, Y; Ji, Y; Wang, L; Huang, Y; Xu, S; Fang, J; Zhao, W; Qian, G; Wu, S; Anguita, J V; Trindade, G F; Xue, S; Wang, H; Gilmore, I; Zhao, Y; Pan, F (2025) In Situ Aminolysis of Fluoroethylene Carbonate Induced Low-Resistance Interphase Facilitating Extreme Fast Charging of Graphite Anodes. Advanced Energy Materials, 15 (27). 2406104

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Abstract

It has been widely recognized that constructing an exceptional solid electrolyte interphase (SEI) layer on graphite anodes is a potential strategy for achieving power batteries' ultrafast charging. However, how to achieve an exceptional SEI layer remains a challenge. This study demonstrated proton-type additives to significantly enhance electrolytes' SEI-formation capability when used with traditional FEC additives. The proton-type additives intrigued the formation of an SEI layer under an elevated voltage of 2.0 V (vs. Li/Li+) during the first cycle, and the resulting SEI was enriched with abundance nanoscale inorganic particles, including lithium fluoride (LiF), lithium carbonate (Li2CO3), lithium oxide (Li2O) and lithium nitride (Li3N). An ion-seepage system has been established with inorganic particles uniformly and densely distributed throughout the SEI to construct Li+ transport networks. The ion-seepage system could facilitate the fast transport of Li+ and reduce the interfacial impedance of graphite anodes, thus the rate performance and low-temperature performance of the electrolyte were significantly enhanced. Furthermore, the prepared pouch cells, under 10C/10C extreme fast charging and discharging conditions, maintained 80.1% capacity retention after 650 cycles. More experiments suggested that this unique performance improvement may originate from the complex reactions between proton-type additive, FEC as well as the components of the electrolyte. Moreover, this strategy exhibits considerable universality, as various proton-type additives and electrolyte systems can achieve similar effects, providing a new approach for developing extremely fast charging power batteries and offering valuable insights.

Item Type:	Article
Subjects:	Advanced Materials > Surface Engineering
Divisions:	Chemical & Biological Sciences
Identification number/DOI:	10.1002/aenm.202406104
Last Modified:	30 Jul 2025 14:44
URI:	https://eprintspublications.npl.co.uk/id/eprint/10215