Inventors:
William M. Lamanna - Stillwater MN, US
Ang Xiao - Woodbury MN, US
Matthew J. Triemert - White Bear Lake MN, US
Phat T. Pham - Little Canada MN, US
Assignee:
3M Innovative Properties Company - St Paul MN
International Classification:
H01M 10/0564
H01M 10/0565
H01M 10/0525
H01M 10/0567
Abstract:
Lithium-ion electrochemical cells are provided that include a positive electrode that includes a lithium metal oxide or a lithium metal phosphate, a negative electrode capable of intercalating or alloying with lithium, and an electrolyte that includes an additive. The additive includes a multifunctional anion that has the formula, X—SO—R—SO—Y, wherein X and Y are, independently, either O— or RSON—, Ris a straight or branched fluoroalkyl moiety having from 1 to 6 carbon atoms, and can, optionally, contain one or more in-chain heteroatoms, wherein R is a straight or branched chain or cyclic fluoroalkylene having from 1 to 10 carbon atoms and can, optionally, contain one or more in-chain heteroatoms, and wherein both Rand R have a maximum of 20% non-fluorine substituents. The provided additives can improve the performance, hydrolytic stability, and thermal stability of the provided electrochemical cells.