Lithium Dihydrogen Phosphate
Lithium dihydrogen phosphate has the chemical formula LiH2PO4, consists of colorless, transparent crystals, and is slightly soluble in water. CAS No.: 13453-80-0
LiH₂PO₄ exhibits good application prospects in Lithium batteries:
Electrolyte additive — it helps to form a stable cathode electrolyte interphase (CEI) rich in phosphate compounds, protecting high-voltage cathodes and suppressing electrolyte oxidation.
Transition-metal dissolution inhibitor — Phosphate groups coordinate with dissolved Mn²⁺, Fe²⁺, and other transition-metal ions, mitigating active-material loss.
High-voltage enabler — it helps to extend the electrochemical stability window of the electrolyte, improving cycle life for high-nickel NCM, Li-rich Mn-based, and spinel LiNi₀.₅Mn₁.₅O₄ cathodes.
Flame retardant / safety improver — Inherent phosphate-based flame-retardant properties reduce electrolyte flammability and enhance thermal safety.
Low-temperature performance — it contributes to a more ion-conductive SEI, helping maintain capacity at sub-zero temperatures.
Supplementary Li/P source for LFP — it can serve as an auxiliary lithium and phosphorus source in LiFePO₄ synthesis and electrolyte design.
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