Abstract: The present invention relates to an electrolyte composition for lithium ion batteries which improves overcharge protection. In particular the present invention relates to an electrolyte composition comprising (a) a compound of general formula (I) and (b) at least two compounds of general formula (II) which are different from each other formula (II) with the definitions given in the description.

Abstract: The present invention relates to an electrolyte composition (A) containing (i) at least one aprotic organic solvent; (ii) at least one conducting salt; (iii) at least one compound of formula (I) and (iv) optionally at least one further additive.

Abstract: The present invention relates to an electrolyte composition with low flammability which can be used in batteries yielding high electrochemical performance. In particular, the present invention relates to an electrolyte composition comprising a) at least 3 wt.-% of the electrolyte composition of at least one compound of general structure (I) R1 and R2 are independent from each other methyl, ethyl, n-propyl or n-butyl and b) at least one anode film forming additive.

Abstract: An electrolyte composition (A) containing (i) at least one aprotic organic solvent; (ii) at least one conducting salt; (iii) at least one compound of formula (I) wherein X1 and X2 are independently from each other selected from N(R1), P(R1), O, and S, Y1 and Y2 are independently from each other selected from (O), (S), (PR2) and (NR2); and electrochemical cells containing electrolyte composition (A).

Abstract: The present invention relates to an electrolyte composition (A) containing (i) at least one aprotic organic solvent; (ii) at least one conducting salt; (iii) at least one compound of formula (I) and (iv) optionally at least one further additive.

Abstract: Provided are a process for producing an active cathode material comprising at least one oxide of a metal M and at least one sulfide of said metal M, an active cathode material obtained by said process, electrodes comprising said active cathode material and rechargeable electrochemical cells comprising said electrodes.

Abstract: An electrolyte composition (A) containing (i) at least one aprotic organic solvent; (ii) at least one conducting salt; (iii) at least one compound of formula (NC)(A1X1)C?C(X2A2)(CN) wherein X1 and X2 are independently from each other selected from N(R?), P(R1), O, and S, and A1 and A2 are selected from H or organic substituents; and electrochemical cells containing electrolyte composition (A).

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.

Abstract: The present invention relates to electrochemical cells comprising (A) at least one cathode comprising at least one lithium ion-containing transition metal compound, (B) at least one anode, and (C) at least one layer comprising (a) at least one sulfur-containing polymer (a) comprising sulfur atoms bound in the form of monovalent thiol groups —SH or thiolate groups —S? or bound as divalent disulfide or polysulfide bridges —(S)m— in which m is an integer from 2 to 8, and (b) optionally at least one binder. The present invention further relates to the use of inventive electrochemical cells, and to lithium ion batteries comprising at least one inventive electrochemical cell.