Nonaqueous organic electrolytes for low temperature discharge of rechargeable electrochemical cells
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United States of America Patent
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Jun 8, 2004
Grant Date -
Jul 3, 2003
app pub date -
Aug 30, 2002
filing date -
May 13, 1998
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Abstract
An alkali metal secondary electrochemical cell, and preferably a lithium ion cell, activated with an equilibrated quaternary solvent system, is described. The solvent system comprises a mixture of dialkyl carbonates and cyclic carbonates, and preferably a quaternary mixture of dimethyl carbonate, diethyl carbonate, ethylmethyl carbonate and ethylene carbonate with dimethyl carbonate, diethyl carbonate and ethylmethyl carbonate in an equilibrated molar mixture. Lithium ion cells activated with this electrolyte have good room temperature cycling characteristics and excellent low temperature discharge behavior.
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