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Metaphosphoric acid (HPO3), aluminum salt

CAS No.: 13776-88-0

  • Molecular Formula: AlO₉P₃
  • Molecular Weight: 263.90 g/mol

Chemical type

  • Inorganic phosphate compound
  • Electrolyte additive for lithium-ion batteries

Key properties

  • Decomposes on cathode surface to form AlF₃ and Al₂O₃
  • Scavenges hydrofluoric acid (HF)
  • Contributes to formation of a dense, inorganic-rich cathode electrolyte interphase (CEI)
  • Cathode stabilizer in high-voltage lithium-ion batteries
  • HF scavenger to mitigate cathode corrosion

Classification by use

  • Electrolyte additives for battery performance enhancement
  • Chemicals used in high-energy-density battery systems

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  1. Aluminum metaphosphate-derived CEI suppresses interfacial degradation of NCM811 at 4.5 V and 60 °C, Electrochemistry Communications, Volume 184, March 2026, 108114