The quest for higher energy density in lithium-ion batteries (LIBs) necessitates innovative approaches to electrolyte formulation. While traditional electrolytes provide the necessary ionic conductivity, achieving superior performance, especially with advanced anode materials like silicon, requires sophisticated additive strategies. This article explores the synergistic effects observed when Vinylene Carbonate (VC) is combined with novel additives such as DMVC-OCF3 and DMVC-OTMS, highlighting their collective impact on battery performance, stability, and longevity.

Silicon anodes, with their exceptionally high theoretical capacity, are poised to revolutionize energy storage. However, their practical implementation is hindered by severe volume expansion during cycling, which degrades the Solid Electrolyte Interphase (SEI). Vinylene Carbonate has been a standard additive for improving SEI formation on silicon anodes, offering a degree of protection against this degradation. Yet, to truly unlock the potential of high-energy LIBs, a more comprehensive approach is needed. This is where the synergistic combination of VC with DMVC-OCF3 and DMVC-OTMS comes into play.

DMVC-OCF3 contributes to the formation of a more flexible and robust SEI layer. Its structure allows for better accommodation of the silicon anode's volume fluctuations, preventing cracking and maintaining electrical contact. Simultaneously, DMVC-OTMS plays a critical role as a hydrofluoric acid (HF) scavenger. HF, a byproduct of LiPF6 salt decomposition, can severely compromise the integrity of both the SEI and the Cathode Electrolyte Interphase (CEI). By effectively neutralizing HF, DMVC-OTMS protects these vital interfaces from chemical attack, significantly enhancing the battery's overall stability and cycle life.

The combined effect of these additives results in a more stable and protective SEI layer that not only withstands the mechanical stresses of silicon cycling but also provides superior chemical protection. This leads to improved lithium-ion battery performance enhancement, including better capacity retention over extended cycling periods. Furthermore, this synergistic approach has shown promise in improving fast charging capabilities. By optimizing the ion transport pathways within the electrolyte and at the electrode-electrolyte interfaces, batteries can be charged more rapidly without the rapid capacity fade typically associated with high charge rates.

The development of such advanced electrolyte additive systems is crucial for meeting the growing demands for high-performance energy storage. The combined strengths of Vinylene Carbonate, DMVC-OCF3, and DMVC-OTMS offer a compelling solution for creating next-generation LIBs that are more durable, faster charging, and capable of higher energy densities. This integrated additive strategy represents a significant step forward in addressing the critical challenges associated with silicon anodes and pushing the boundaries of battery technology.