Patent ID: 9719954
Date: 2017-08-01
CPC Classifications: G01G,G01N,H01M,Y02E

Claim:
1. A process for detecting and assaying hydrofluoric acid in an electrolyte based on lithium hexafluorophosphate LiPF 6 , comprising: (i) bringing the electrolyte into contact with a first layer comprising a material M that reacts at a surface with hydrofluoric acid HF, the hydrofluoric acid originating from the reaction between lithium hexafluorophosphate and water; (ii) measuring variation in weight of the first layer by bringing the first layer into contact with an electrode of a quartz crystal microbalance, the variation in weight of the first layer being due to the reaction between the material M of the first layer and the hydrofluoric acid HF to form, at a surface, a second layer comprising a fluorinated compound having the structure MF (iii) calculating the content by weight of hydrofluoric acid from the variation in weight of the first layer determined in (ii).