TCEP {1,2,3-Tris(2-cyanoethoxy)propane, TPPN, >99.0%} as Battery Electrolyte Additive, 10-50 g/bottle, CBEATCEP
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1,2,3-Tris(2-cyanoethoxy)propane (commonly designated as TCEP or TPPN) is a specialized multi-nitrile ether compound engineered as a high-performance electrolyte additive and interphase-stabilizing agent for advanced lithium-ion and high-voltage lithium-metal batteries. By featuring three polar cyanoethoxy branches attached to a central propane backbone, TCEP delivers exceptional coordination capability and interfacial passivation under high-voltage operating conditions.
The main functional roles of the TCEP are: (1) Robust Cathode-Electrolyte Interphase (CEI) Formation: Due to the oxidation activity of the electron-withdrawing nitrile groups, TCEP preferentially participates in sacrificial electrochemical oxidation at the surface of high-voltage cathodes during initial charging. This builds a uniform, protective CEI layer that suppresses continuous solvent breakdown and gas evolution. (2) Mitigation of Transition-Metal Dissolution: The nitrogen-rich molecular fragments coordinate strongly with exposed transition metal ions on high-nickel cathode surfaces, effectively passivating catalytic sites and preventing structural degradation (such as phase transitions from layered to rock-salt structures). (3) Anode Passivation Support (SEI Enhancement): Reduction products derived from the cyanoalkyl groups assist in forming a stable, nitrogen-containing inorganic-organic hybrid Solid Electrolyte Interphase (SEI) on graphite or silicon composite anodes, curbing ongoing electrolyte consumption. (4) Solvation Sheath & Viscosity Modification: While maintaining moderate fluidity, TCEP gently modulates the local lithium-ion coordination shell, encouraging beneficial anion participation in the inner solvation sphere.
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 extended cycle stability and capacity retention in cells operating at upper cut-off voltages exceeding 4.3 V to 4.5 V. (2) High-Nickel and Cobalt-Rich Chemistries: Deployed alongside nickel-rich layered oxide cathodes (such as NMC811) to mitigate high-temperature impedance growth and minimize capacity fade under aggressive cycling protocols.
| Part Number |
CBEATCEP (C-BEA-TCEP) |
| CAS |
2465-93-2 |
| Chemical Formula |
C12H17N3O3  |
| Appearance |
Colorless liquid |
| Purity |
>99.0% |
| Molecular Weight | 251.29 g/mol |
| Package Size | 10 g, 25 g, and 50 g/bottle |
Notes: Please store the TCEP liquid in the dry place (glovebox is the best).
References:
- J. Han, et al. In Situ Protective Interface Construction via a Cyano-Ether Additive for Durable Zinc Metal Anodes, Adv. Funct. Mater., 2026, DOI: 10.1002/adfm.78116
- W. Wang, et al. Bifunctional mechanism and electrochemical performance of self-healing nitrile ether electrolyte additives in 4.5 V LiCoO2/artificial graphite lithium-ion batteries, Journal of Power Sources, 2022, 542, 231799