This solvent DEC (diethyl carbonate, CAS: 105-58-8) is developed for use as a high-purity electrolyte solvent in lithium-ion battery research and advanced energy storage applications. As a key component in electrolyte formulations, it offers good solubility for lithium salts and contributes to stable cycling performance and low-temperature operation. The product is available in multiple packaging sizes, from 20 g to 1000 g, accommodating both small-scale lab screening and larger experimental setups. Its consistent quality supports reproducible results in studies examining electrolyte decomposition, solid-electrolyte interphase formation, and solvent co-solvent interactions. Canrd’s DEC is suitable for researchers working on next-generation battery materials, including high-voltage cathodes and silicon anodes, where solvent purity and stability are critical.