BDTD {[4, 4′-bi(1,3,2-dioxathiolane)] 2,2′-dioxide, >99.0%} as Battery Electrolyte Additive, 5-25 g/bottle, CBEABDTD

BDTD ([4,4'-bi(1,3,2-dioxathiolane)] 2,2'-dioxide or more precisely 4,4'-bi(1,3,2-dioxathiolane) 2,2,2',2'-tetraoxide) is an advanced, multi-functional dimeric cyclic sulfate compound engineered as a high-performance electrolyte additive for advanced lithium-ion and high-voltage lithium-metal batteries. By linking two cyclic sulfate rings into a rigid dimeric architecture, BDTD provides exceptional interfacial stabilization and radical scavenging capabilities under high-voltage and high-temperature stress.

The main functional roles of the BDTD are: (1) Sacrificial Cathode-Electrolyte Interphase (CEI) Formation: BDTD preferentially oxidizes at the surface of high-voltage transition metal oxide cathodes during early-stage charging. This sacrificial oxidation yields a uniform, passivating CEI layer that suppresses continuous electrolyte oxidation, transition-metal dissolution, and parasitic gas generation. (2) Robust Anode Passivation (SEI Enhancement): Beyond its primary role at the positive electrode, reduction products derived from the multi-functional cyclic sulfate moieties participate in forming an inorganic-rich, highly stable Solid Electrolyte Interphase (SEI) on graphite, silicon-composite, or lithium metal anodes. (3) Impedance Mitigation & Structural Protection: By establishing a thin, electronically insulating yet ionically conductive dual-interphase film, BDTD prevents the progressive impedance growth typically associated with repeated solvent breakdown and surface phase transitions on high-nickel cathodes. (4) Thermal and Overcharge Stability: The rigid dimeric sulfate structure enhances thermal resistance, helping mitigate exothermic runaway reactions during abusive thermal or overcharge testing.

Its primary electrochemical domains are: (1) High-Voltage Lithium-Ion Full Cells: Integrated into standard carbonate master electrolytes (e.g., LiPF6 in EC/EMC) to support cells cycled at upper cut-off voltages exceeding 4.5 V to 4.6 V (such as with high-nickel NMC811 or high-voltage cobalt systems). (2) Silicon-Anode and High-Energy Integrations: Deployed to stabilize the highly reactive surfaces of silicon-containing anodes, accommodating volumetric shifts while curbing continuous electrolyte consumption.

Part Number	CBEABDTD (C-BEA-BDTD)
CAS	1914148-67-6
Chemical Formula	C4H6O6S2
Appearance	Colorless liquid
Purity	>99.0%
Molecular Weight	214.22 g/mol
Package Size	5 g, 10 g, and 25 g/bottle

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

References: 

1. S. H. Lee, et al. [4,4′-bi(1,3,2-dioxathiolane)] 2,2′-dioxide: A novel cathode additive for high-voltage performance in lithium ion batteries, Journal of Power Sources, 2018, 378, 112-118
2. J. Im, et al. A dual-function sulfite-type additive for long cycle life in high-voltage lithium metal batteries, Journal of Alloys and Compounds, 2021, 872, 159662