Patent ID: 6153338
Filing Date: 2000-11-28
Classification: H01M,Y02E

Abstract:
A method for providing an electrochemical cell, comprising the steps of:a) mixing dimethyl carbonate and diethyl carbonate together in the presence of a catalyst to thereby provide an equilibrated first solvent mixture of dimethyl carbonate, ethylmethyl carbonate and diethyl carbonate;b) mixing ethylene carbonate with the first solvent mixture to provide a second solvent mixture comprising dimethyl carbonate in the range of about 12% to about 75%, ethylmethyl carbonate in the range of about 5% to about 50%, diethyl carbonate in the range of about 3% to about 45% and ethylene carbonate in the range of about 10% to about 50%, by volume;c) dissolving a lithium salt in the second solvent mixture to provide an electrolyte; andd) activating a negative electrode which intercalates with lithium and an associate positive electrode which intercalates with lithium, and wherein the electrochemical cell is dischargeable at a temperature below -