Honeywell International Inc.

Sonja Demel

Alfred Siggel

Thirumalai G Palanisamy

Frank Nerenz

Andrew Joseph Poss

Michael Fooken

Andreas Kanschik-Conradsen

Jeremy Diringer

Michael Theissen

Brian O'Leary

Alfred Sieggel

A method for preparing a spiro quaternary ammonium system and electrolytes containing spiro quaternary ammonium cations, comprising a synthesizing step wherein a spiro ammonium system is formed in a medium that can serve as both the reaction solvent and as an electrolyte solvent. A one-solution method of making a non-aqueous electrolyte composition that comprises at least one of a spiro quaternary ammonium compound of the following formula: 

Method for synthesizing quaternary ammonium systems

A method for preparing a spiro quaternary ammonium system and electrolytes containing spiro quaternary ammonium cations, comprising a synthesizing step wherein a spiro ammonium system having a structure of: wherein n is independently an integer from about 0 to about 6;

A method for reducing pressure build-up in an electrochemical cell is provided comprising: providing an anhydrous nonaqueous electrolyte solution comprising at least one quaternary ammonium salt and at least one anhydrous nonaqueous solvent; contacting the electrolyte solution with at least one acid scavenger; and loading the nonaqueous electrolyte solution into the electrochemical cell. Also, provided is an electric double-layer capacitor (supercapacitor) comprising a free acid scavenger.

High voltage electrolytes

Provided are methods of purifying quaternary onium salts having the steps of (a) providing an quaternary onium salt solution having a first ionic impurity concentration; (b) providing an ion exchange material charged with electrochemically stable anions; and (c) contacting the salt solution with the ion exchange material to produce an quaternary onium salt solution having a second halide concentration is less than the first ionic impurity concentration.

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Wunstorf, Germany

Sonja Demel