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Additive Screening of LFP/Graphite Pouch Cell for High Temperature Cycling at 70 oC Mechanism reflection: Lithium loss is driven by growth of the SEI on the negative electrode, which is catalyzed by Fe dissolution from the positive electrode, forming a well–passivated SEI and mitigating Fe dissolution throughout lifetime decrease lithium loss. Lifetime improvement: 25 electrolyte combinations were evaluated to address inferior cycling performances of LFP/Graphite cell compared to the NCM operated at high temperatures, indicating the increase of VC concentration can result in longer lifetimes POST LONG-TERM CYCLE METRICS (70 OC)
HIGH TEMPERATURE CYCLING (70 OC)
It is evident that the VC-series has the best lifetime, followed by the PES-Series, and then the FEC-Series A significant improvement in the lifetime of LFP/graphite pouch cell cycled at high temperature (70 °C) achieved by doubling the VC concentration to 4%
Gassing
Charge transfer resistance
Fe dissolution
Vinylene carbonate (VC) at 4–5% (w/w) was found as the most effective additive for improving the lifetime of LFP graphite pouch cells during cycling and storage at high temperatures Source: Journal of The Electrochemical Society, 2025, 172, 020536
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