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Keywords:

  • aluminum complex;
  • capacitors;
  • polymers;
  • phosphate;
  • ternary complexes
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A novel aluminum complex that inhibits hydration-related deterioration of the alumina electrode in electrolytic capacitors has been isolated. The complex forms ternary complexes with phosphate ions and protects the electrode surface by forming a phosphate-ion monolayer. The ternary complex is essential to maintain a constant phosphate-ion concentration in the capacitor electrolytic solution, to protect the electrode for >10 000 h at 105 °C.