Lithium fluoroalkylphosphates: a new class of conducting salts for electrolytes for high energy lithium-ion batteries

The effort to develop improved electrolytes that satisfy the requirements o f lithium rechargeable batteries has intensified the search for new conduct ing salts having an improved chemical and electrochemical stability. With L ithium fluoroalkylphosphates, we introduce a new class of conducting salts for electrolytes for high energy lithium-ion batteries. The results of elec trochemical studies of Li[(C2F5)(3)PF3] in organic carbonates in comparison to LiPF6 including electrochemical stability and charge-discharge efficien cy are reported. In addition, the influence of perfluorinated alkyl groups on stability towards hydrolysis is demonstrated. (C) 2001 Elsevier Science B.V. All rights reserved.