MDTD (4-Methyl-1,3,2-dioxathiolane 2,2-Dioxide, >99.0%) as Battery Electrolyte Additive, 5-25 g/bottle, CBEAMDTD
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4-Methyl-1,3,2-dioxathiolane 2,2-dioxide (MDTD)—commonly known as Propylene Sulfate (PGLT) or Methyl Ethylene Sulfate—is a cyclic sulfate functional additive used in non-aqueous electrolytes for high-voltage lithium-ion (LIBs), lithium-metal, and sodium-ion batteries. It is the methyl-substituted derivative of ethylene sulfate (DTD).
Sacrificial Reduction & Conductive Inorganic SEI: MDTD possesses a higher reduction potential (~ 1.3 V to 1.5 V vs. Li/Li+) than standard cyclic carbonates like ethylene carbonate (EC) or propylene carbonate (PC). It reduces preferentially on graphite, silicon-carbon, or lithium anodes via ring-opening cleavage of C–O and S–O bonds, forming an inorganic sulfur-rich Solid Electrolyte Interphase (SEI) composed of Li2SO4, Li2SO3, and alkyl sulfates.
Cathode Interphase Passivation at High Voltages (>4.5 V): MDTD participates in sacrificial oxidative decomposition at cathode surfaces, constructing a thin, highly protective Cathode Electrolyte Interphase (CEI). This CEI suppresses transition-metal leaching Mn^{3+}, Ni^{3+}/Ni^{4+} and lattice oxygen release in high-voltage cathodes like high-voltage spinels (LiNi0.5Mn1.5O4 / LNMO) and nickel-rich layered oxides (NCM811).
Advantages Over Ethylene Sulfate (DTD): (1) Enhanced Solubility & Liquid Range: The methyl group breaks molecular symmetry, lowering the melting point and increasing solubility in linear carbonate solvent mixtures compared to unsubstituted DTD. (2) Thinner, Uniform Interphase: MDTD forms a thinner, more uniform, and less resistive interphase film than DTD, leading to lower charge-transfer resistance (Rct) and superior fast-charging/high-rate performance.
| Part Number |
CBEAMDTD (C-BEA-MDTD) |
| CAS |
5689-83-8 |
| Chemical Formula |
C3H6O4S  |
| Appearance |
Colorless Liquid |
| Purity |
>99.0% |
| Molecular Weight | 138.14 g/mol |
| Package Size | 5 g, 10 g, and 25 g/bottle |
Notes: Please store the MDTD solution in a dry place (glovebox is the best).
References:
- J. Mu, et al. High-voltage performance of LiNi0.5Mn1.5O4-based lithium-ion batteries with 4-methyl-1,3,2-dioxathiolane-2,2-dioxide (MDTD) as an electrolyte additive, J. Mater. Chem. A (2024) 12 (33): 22151–22165.
- H. Zhao, et al. Significance of electrolyte additive molecule structure in stabilizing interphase in LiNi0.8Co0.1Mn0.1O2/artificial graphite pouch cells at high temperature, Energy Storage Materials, 2024, 65, 103151