Performance Evaluation and Analysis of Rolechem's ARC-S27 (DTD Derivative Series)

Rolechem has launched its new additive, ARC-S27. As a fluorinated sulfur-based compound, its advantages include: Outstanding Interface Optimization Capability: Priority film formation and low charge transfer impedance enhance initial Coulombic efficiency (ICE) and initial cycling performance, making it suitable for scenarios sensitive to initial capacity and fast charging (such as consumer electronics batteries). Strong Low-Temperature Adaptability: Performance at extreme low temperatures such as -20°C is significantly superior to that of DTD, expanding its application to low-temperature environments like winters in northern regions. Good High-Rate Compatibility: The improved rate performance indicates its suitability for power battery scenarios requiring frequent fast charging or high power output. We welcome industry partners to engage with us for further discussions.

Cell Type: 1Ah pouch cell Chemistry System: NCM523 / Artificial Graphite Voltage Window: 2.75 V – 4.4 V Electrolyte Baseline (Common Components): EMC : EC : DEC = 5 : 3 : 2 , 1.1M LiPF6, with VC + PS + LiFSI additives Scheme A: Common Components + 1% DTD Scheme B: Common Components + 1% ARC-S27

01 ICE: The ICE of the ARC-S27 group is 84.99%, higher than that of the baseline group (84.31%), with an improvement of 0.68%. 02 Initial Discharge Capacity: The initial discharge capacity of ARC-S27 is 1.149 Ah, which is 15 mAh higher than that of the baseline group (1.134 Ah). This indicates that the ARC-S27 cells experience less active lithium loss during the initial charge-discharge process and exhibit higher electrolyte film-forming efficiency.

The charge transfer impedance of the ARC-S27 group cells is lower than that of the DTD group, resulting in higher ion conduction efficiency, which is more favorable for enhancing SEI film interfacial stability and fast-charging capability. Additionally, analysis of the dQ/dV curves shows that its film-forming potential is superior to that of DTD.

01 Low-Temperature Discharge Performance: Under low-temperature environments such as -20°C, the capacity retention rate of ARC-S27 (55.7%) is superior to that of DTD (50.8%), indicating stronger ion conduction capability at low temperatures and suitability for low-temperature application scenarios. 02 High-Temperature Discharge Performance: There is little difference between the two groups in high-temperature discharge performance, demonstrating that ARC-S27 can maintain baseline high-temperature performance.

Overall, both the fast-charging and fast-discharging performance of ARC-S27 are superior to those of DTD. Especially under 4C fast charging and 5C fast discharging, the fast-charging performance improves by about 2%, and the fast-discharging performance improves by about 3%. This indicates its ability to better adapt to high-power charge-discharge demands, making it suitable for high-rate scenarios such as power batteries.

The high-temperature retention rate, recovery rate, and high-temperature cycling performance of the ARC-S27 group show no significant degradation compared to DTD.

In summary, as a DTD derivative, ARC-S27 demonstrates significant advantages in initial Coulombic efficiency, low-temperature performance, and rate capability, holding the potential to replace DTD. It is particularly well-suited for application scenarios requiring low-temperature performance and fast charging. However, there is still room for optimization in terms of high-temperature storage stability and self-discharge control. It is recommended to conduct further formulation adaptation research to balance full-temperature-range performance and expand its application scope.