Lithium-ion battery electrolytes with improved thermal stability
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United States of America Patent
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Issued Date -
May 13, 2004
app pub date -
Jun 20, 2003
filing date -
Jun 20, 2002
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Abstract
Thermally stable electrolytes for Li-ion batteries obtained with the use of Lewis base additives to the electrolytes are disclosed. The Lewis bases stabilize electrolytes composed of solutions of LiPF.sub.6 in organic carbonates against decomposition at temperatures as high as 85.degree. C. Additives suitable for stabilizing LiPF.sub.6-containing electrolytes include amines, for example, triethylenediamine (TEDA) and 2,2'-bipyridine (BIPY), phosphines, for example, triphenylphosphine (TPP) and tributylphosphine (TBP), and nitrogen-phosphorus bonded compounds such as hexamethoxycyclotriphosphazene ([N.dbd.P(OCH.sub.3).sub.2].sub.3) (HMOPA), hexamethyl phosphoramide (HMPA), and N-phenyl-P,P,P-trimethylpho-sphorimidate (PhTMI). These additives are also capable of stabilizing electrolytes in solvents other than carbonates including ethers, esters and sulfones.
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