Vinylene carbonate (VC), with the CAS number 872-36-6, is a colorless to pale yellow liquid organic compound. It is a cyclic carbonate ester characterized by a five-membered ring containing a carbon-carbon double bond (C=C) and a carbonate group (O-CO-O). This specific structure makes it a crucial functional additive in the field of advanced lithium-ion batteries. Its primary and most significant application is as an electrolyte additive in lithium-ion batteries. VC decomposes preferentially on the surface of the graphite anode during the initial charging cycles. This decomposition forms a stable, flexible, and ion-conductive solid electrolyte interphase (SEI) layer. This high-quality SEI effectively suppresses further electrolyte decomposition, minimizes gas generation, and significantly improves the cycling performance, capacity retention, and thermal stability of the battery, especially under high-voltage or high-temperature conditions. Due to these exceptional properties, vinylene carbonate is considered an indispensable component in electrolytes for high-performance lithium-ion batteries used in electric vehicles, consumer electronics, and energy storage systems. It is a key enabler for enhancing battery life and safety.