Patent ID: 8000084

Claim:
A method for reducing pressure build-up in an electrochemical cell comprising: providing an anhydrous nonaqueous electrolyte solution comprising at least one quaternary ammonium salt and at least one anhydrous nonaqueous solvent; contacting said electrolyte solution with at least one acid scavenger selected from the group consisting of bis(trimethylsilyl)carbodiimide, low molecular weight polycarbodiimide, 2-tert-butylimino-2-diethylamino-1,3-dimethyl-perhydro-1,3,2-diazaphosphorine, 1-tert-octyl-4,4,4-tris(dimethylamino)-2,2-bis[tris(dimethylamino)phosphoranylidenamino]-2 5 ,4 5 -catenadi(phosphazene), and derivatives and precursors thereof, wherein the contacting comprises dissolving or suspending the at least one acid scavenger in said electrolyte solution; and loading said nonaqueous electrolyte solution into said electrochemical cell.