Performance Evaluation and Analysis of Rolechem's ARC-S31 (DTD Derivative Series)

Rolechem has launched its new additive, ARC-S31, as a derivative of DTD. Its core advantages and differentiated performances include: ARC-S31 is highly equivalent to DTD in basic electrochemical performance (such as initial Coulombic efficiency, interfacial impedance, and high-temperature storage), but exhibits superior performance in high-rate charge-discharge scenarios, showing distinct rate capability advantages especially under 4C conditions. Meanwhile, its low-temperature performance and long-term cycling stability are on par with those of DTD. We welcome industry partners to engage with us for further discussions.

Cell Type: 1Ah pouch cell Chemistry System: NCM / Artificial Graphite Voltage Window: 2.75 V – 4.3 V Electrolyte Baseline (Common Components): EC : EMC : DEC = 3 : 5 : 2 , 1.1M LiPF6， with VC + LiFSI + LiODFB additives Scheme A: Common Components + 1% DTD Scheme B: Common Components + 1% ARC-S31

01 Acidity Trend: Judging from the acidity change curve over time (Day 1 to Day 7), the acidity growth rate of the DTD group is higher than that of the S31 group, indicating that S31 performs slightly better in side reactions within the electrolyte and possesses excellent chemical structural stability.

There is almost no difference in discharge capacity and ICE between ARC-S31 and DTD (82.53% vs. 82.39% for DTD), indicating that the solid electrolyte interphase (SEI) films formed by both at the electrode/electrolyte interface have comparable performance. The dQ/dV curves show that ARC-S31 is superior to DTD in film formation, and both can form a stable SEI film in the NCM/artificial graphite system, suppress the decomposition of the electrolyte solvent, protect the electrode material, and achieve comparable control over irreversible capacity loss during the initial charge and discharge.

01 High-Temperature Storage: The capacity retention and recovery rates of the S31 group and the DTD group are basically consistent. The internal resistance change rates (27.63% vs. 27.61%) are almost identical, indicating that both possess comparable high-temperature structural stability. 02 Wide-Temperature Discharge Capacity: In the temperature range from -20°C to 55°C, the capacity retention curves of S31 and DTD highly overlap. Only at low temperatures (-20°C) is the capacity retention rate of S31 (59.6%) slightly higher than that of DTD (58.6%), reflecting slightly better ion conduction capability at extreme low temperatures, which may be attributed to the additive's fine-tuning of the solvation structure in the electrolyte.

01 High-Temperature Cycling: There is little difference in performance between the two, and both can maintain stable capacity retention, indicating consistent electrolyte structural compatibility under thermal cycling. 02 High-Rate Charge and Discharge: Under 4C fast charging, the capacity retention rate of the S31 group (77.2%) is significantly superior to that of the DTD group (74.7%), showing an advantage of 2.5%. Under 5C fast discharging, the difference narrows (91.0% vs. 90.4%), demonstrating that S31 exhibits lower polarization and higher charge transport efficiency under high current densities.

In summary, as a DTD derivative, ARC-S31 maintains interfacial stability, high-temperature storage performance, and wide-temperature adaptability equivalent to DTD, while significantly enhancing high-rate charge-discharge capability through molecular structure optimization. Its core advantages stem from the improvement of SEI film ion conductivity and the suppression of polarization. This additive is suitable for power lithium battery systems that demand higher fast-charging performance (such as 4C and higher rate scenarios), while it can directly replace DTD in conventional cycling and high-temperature environments, combining performance equivalence with superiority in specific scenarios.