DTDL {2,2-Dimethoxy-4-(trifluoromethyl)-1,3-dioxolane, >99.0%} as Battery Electrolyte Co-Solvent and Additive, 5-25 g/bottle, CBESADTDL

2,2-Dimethoxy-4-(trifluoromethyl)-1,3-dioxolane (commonly designated as DTDL) is an advanced fluorinated cyclic ether solvent and electrolyte component. By incorporating a cyclic dioxolane backbone functionalized with an electron-withdrawing trifluoromethyl (-CF3) group and dual linear methoxy groups, DTDL bridges the gap between the high anodic stability of fluorinated media and the solvating performance required for high-energy lithium batteries.

The main functional roles of the DTDL are: (1) Solvation Structure & Sheath Tuning: DTDL actively modifies the primary lithium-ion coordination shell. Its specific molecular geometry encourages contact ion pairs (CIPs) and aggregates (AGGs), suppressing solvent-separated ion pairing even at moderate salt concentrations. (2) Anion-Derived Interphase (SEI/CEI) Passivation: When paired with salts like lithium bis(fluorosulfonyl)imide (LiFSI), DTDL promotes the preferential decomposition of counter-anions on the anode surface. This generates a robust, inorganic-rich Solid Electrolyte Interphase (SEI) heavily enriched with lithium fluoride (LiF) that suppresses dendrite proliferation. (3) High-Voltage Oxidative Resistance: The electron-withdrawing inductive effect of the -CF3 group lowers the Highest Occupied Molecular Orbital (HOMO) energy level, successfully preventing premature oxidative breakdown when operating against high-cutoff-voltage transition metal oxide cathodes.

Its primary electrochemical domains are: (1) High-Voltage Lithium-Metal Batteries (LMBs): Utilized as a primary or co-solvent system to enable stable, long-term lithium stripping and plating, achieving high average Coulombic efficiencies (exceeding 99.2% over hundreds of cycles). (2) Advanced Full-Cell Configurations: Integrated into high-energy cells paired with nickel-rich layered oxide cathodes (such as LiNi0.8Co0.1Mn0.1O2 or NMC811) to mitigate transition-metal dissolution and maintain high-capacity retention under demanding cycling protocols.

Part Number	CBESADTDL (C-BESA-DTDL)
CAS	2977166-74-6
Chemical Formula	C6H9F3O4
Appearance	Colorless liquid
Purity	>99.0%
Molecular Weight	202.13 g/mol
Package Size	5 g, 10 g, and 25 g/bottle

Notes: Please store the DTDL liquid in the dry place (glovebox is the best).

References: 

1. Y. Zhao, et al. Fluorinated ether electrolyte with controlled solvation structure for high voltage lithium metal batteries, Nature Communications, 2022, 13, 2575.
2. Q. He, et al. Electrolyte-Induced Interphase Programming for Aprotic High-Energy Lithium Metal Batteries, ACS Energy Lett. (2026) 11 (2): 1397–1422.