Lithium-Ion

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 LONGTERM CYCLE METRICS 70 OC

HIGH TEMPERATURE CYCLING 70 OC

It is evident that the VC-series has the best lifetime, followed by the PESSeries, and then the FECSeries 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 45% (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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