Patent ID: 7785740

Claim:
An electrochemical cell comprising a negative electrode, a positive electrode, and an electrolyte, said electrolyte comprising at least one aprotic organic carrier and at least one salt wherein at least one salt provides overcharge protection, wherein said salt that provides overcharge protection comprises: i) at least one lithium fluoroborate selected from the group consisting of the compounds represented by the formula: Li 2 B 10 F x Z 10−x wherein x is at least 3 and Z represents H, CI, Br, or OR, where R=H, C 1-8 alkyl, fluoroalkyl or aryl, ii) has a reversible oxidation potential from about 0.1 to about 2 volts above the voltage of the cell, and iii) comprises from about 3 to about 70% by weight of the total weight of the salt.