POLYVINYLPYRIDINE ADDITIVES FOR NONAQUEOUS ELECTROLYTES ACTIVATING LITHIUM RECHARGEABLE ELECTROCHEMICAL CELLS

摘要

An electrolyte comprising an organic solvent, a lithium salt, and a polymer additive comprised of repeating vinyl units joined to one or more heterocyclic amine moieties is described. The heterocyclic amine contains five to ten ring atoms, inclusive. An electrochemical cell is also disclosed. The preferred cell comprises a negative electrode which intercalates with lithium, a positive electrode comprising an electrode active material which intercalates with lithium, and the electrolyte of the present invention activating the negative and the positive electrodes.

主权项

1. An electrolyte for an electrochemical cell, the electrolyte comprising:
a) a linear carbonate mixture of dimethyl carbonate (DMC), diethyl carbonate (DEC), and ethylmethyl carbonate (EMC), wherein by volume percent, DMC is in the range of from about 5% to about 75%; EMC is in the range of from about 5% to about 50%; and DEC is in the range of from about 3% to about 45%; b) ethylene carbonate (EC) as a cyclic carbonate, wherein the EC is in the range of from about 10% to about 50% by volume percent; c) a lithium salt; and d) poly(2-vinylpyridine-co-styrene) at a concentration of from about 0.05 to less than 1.0 weight percent.