A straightforward approach to improve NCM523/graphite pouch battery performance in a wide temperature range at 4.35 V using film-forming additive N-phenylimidodisulfuryl fluoride (PhFSI)†
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Abstract
Increasing the specific capacity through higher nickel content and extending the cut-off voltage beyond 4.2 V are promising strategies for augmenting the energy density in future lithium-ion battery designs. However, these modifications often destabilize the electrolyte/electrode. In this work, a novel multi-functional film-forming additive, N-phenylimidodisulfuryl fluoride (PhFSI), is introduced to improve the electrochemical performance of lithium-ion batteries. PhFSI successfully establishes a robust solid electrolyte interphase (SEI) on both the cathode and anode, remarkably enriched with LiF, N and S-containing species. This advancement results in a significant reduction of impedance growth, suppresses the dissolution of transition metal (TM) ions, and alleviates electrode degradation. Notably, the NCM523/graphite batteries incorporating 1 wt% PhFSI exhibit markedly improved cycling stability across a wide temperature range, ranging from −10 to 45 °C. Thus, PhFSI emerges as a superior performance additive, presenting a groundbreaking electrolyte solution for high-voltage lithium-ion batteries under varied thermal conditions.
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