Performance Evaluation and Analysis of Rolechem's New ARC-P06 and ARC-P07 Phosphite Ester Series
I. Performance Summary and Analysis
Rolechem has launched its new additives, ARC-P06 and ARC-P07. This series belongs to phosphite esters, offering advantages in improving high-temperature storage performance and high-temperature cycling stability, as well as enhancing rate capability.
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II. Evaluation Conditions
Cell Type: 1Ah pouch cell
Chemistry System: NCM622 / Artificial Graphite
Voltage Window: 2.75 V – 4.3 V
Electrolyte Baseline (Ref): EC : EMC : DEC = 1 : 1 : 1, 1 M LiPF6, with VC + FEC additives
Control Group: Electrolyte Baseline (Ref.)
Experimental Groups: 0.5% ARC-P06, 0.5% ARC-P07
III. Experimental Results
Both P06 and P07 additives can form a stable SEI film. During the formation stage, they form films earlier than the reference group additives, exhibiting higher film-forming efficiency. P06 and P07 demonstrate exceptional high-temperature storage performance: under 60°C storage conditions, both the capacity retention and recovery rates of the P06/P07 cell groups are comprehensively higher than those of the reference group. Meanwhile, they show a remarkable effect in suppressing impedance growth; after 7 days of storage at 60°C, the internal resistance change rates of P06 and P07 are significantly lower than those of the reference group. However, under low-temperature conditions, the discharge performance is less favorable.
Both P06 and P07 additives can improve the rate capability of cells, with significant enhancements in both fast-charging and fast-discharging performance. At the same time, they deliver outstanding high-temperature cycling performance, showing superior cycling life at 45°C compared to the reference group, slightly outperforming LiPO2F2, while effectively suppressing the growth of cycling impedance.
IV. Conclusion
In summary, as phosphite ester additives, ARC-P06 and ARC-P07 can improve high-temperature storage and high-temperature cycling performance while enhancing rate capability, although their low-temperature performance shows no advantage.
