DEF (N,N-Diethylformamide, >99.5%) as Battery Electrolyte Co-Solvent, 100-500 g/bottle, CBECSDEF

DEF (N,N-Diethylformamide, C5H11N) is a polar, high-boiling-point organic compound occasionally evaluated in specialized electrochemical research and polymer electrolyte processing (such as dissolving polyacrylonitrile or preparing specialized gel/solid polymer matrices and polyMOFs).  When considered as a co-solvent or processing medium in advanced battery configurations, it exhibits distinct solvent and electrochemical behaviors: (1) High Dielectric Constant & Solvation Power: As a dialkylformamide, DEF is strongly polar with a high donor number, making it exceptionally effective at dissolving various lithium/sodium salts, coordination polymers, and binder systems (such as polyvinylidene fluoride or polyacrylonitrile derivatives). (2) High Boiling Point & Thermal Stability: With a boiling point significantly higher than standard linear or cyclic carbonate solvents (like DEC or DMC), it possesses low volatility under ambient pressure conditions.

Part Number	CBECSDEF (C-BECS-DEF)
CAS	617-84-5
Chemical Formula	HCON(C2H5)2
Appearance	Colorless Liquid
Purity	>99.5% (Battery Grade)
Molecular Weight	101.15 g/mol
Density	0.908 g/mL at 25 °C (lit.)
Boiling Point	176-177 °C (lit.)
Package Size	100 g, 200 g, and 500 g/bottle

Notes: Please store the DEF solvent in a dry place (glovebox or dryroom is the best option)

References: 

1. P. Hei, et al. Cosolvent Electrolyte Design for High-Voltage Aqueous Zinc–Sulfur Batteries, Journal American Chemical Society (2025) 147 (31): 27802–27811.
2. A. Y. Sun, et al. Revolutionary horizons in nonaqueous and aqueous-nonaqueous electrolyte design for safer high-performance zinc-ion batteries, iScience, 2026, 29, 115778