Patent ID: 6245464
Filing Date: 2001-06-12
Classification: H01M,Y02E

Abstract:
A secondary electrochemical cell, which comprises:a) a casing;b) a negative electrode comprising a negative electrode active material which intercalates with an alkali metal;c) a positive electrode comprising a positive electrode active material which intercalates with the alkali metal, wherein the negative electrode and the positive electrode are electrochemically associated with each other housed in the casing, and wherein a periphery of the positive electrode is completely bounded by a periphery of the negative electrode to prevent alkali metal from plating as the cell is repeatedly cycled between a charged and a discharged condition; andd) an electrolyte solution activating the negative and positive electrodes, wherein the electrolyte comprises about 45% ethylene carbonate, about 22% dimethyl carbonate, about 24.8% ethylmethyl carbonate and about 8.2% diethyl carbonate, by volume.