ELECTROCHEMICAL CELLS
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United States of America Patent
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Issued Date -
Jul 9, 2015
app pub date -
Jul 17, 2013
filing date -
Jul 20, 2012
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Abstract
A lithium ion battery comprising (i) at least one anode, (ii) at least one cathode containing a cathode active material selected from lithium ion containing transition metal compounds having a content of Manganese of from 50 to 100% wt. based on the total weight of transition metal in the lithium ion containing transition metal compound, and (iii) at least one electrolyte composition containing •(A) at least one aprotic organic solvent, •(B) 0.01 up to less than 5% wt. based on the total weight of the electrolyte composition of at least one compound selected from the group consisting of lithium bis(oxalato)borate, lithium difluoro(oxalato)borate, lithium tetrafluoro(oxalato)phosphate, lithium oxalate, lithium (malonato oxalato)borate, lithium (salicylato oxalato)borate, lithium tris(oxalato)phosphate and vinylene carbonate compounds of formula (I), •(C) 0.01 up to less than 5% wt. based on the total weight of the electrolyte composition of at least one organic phosphonate or phosphate of general formula (IIa) or (IIb), respectively, •(D) at least one lithium salt different from compound (B), and •(E) optionally at least one further additive.
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