Additives for electrolyte and cathode material in Li-ion batteries comprising metal-based cathode material which produces M
Method of improving the performance of a Li-ion battery comprising metal-based cathode material which produces M 2+ metal ions. The method comprises using a small organic compound in association with the electrolyte of the battery or using a polymer compound in association with the cathode active material of the battery. The small organic compound and the polymer compound comprise at least one chemical group suitable for forming complexes with the M 2+ metal ions thereby preventing dissolution thereof.
1 . A method for preventing metal ions dissolution in a Li-ion battery comprising metal-based cathode material which produces M 2+ metal ions, the method comprising:
adding an organic compound to an electrolyte of the Li-ion battery, wherein the organic compound comprises at least one chemical group suitable for forming complexes with the M 2+ metal ions, and wherein the organic compound has a general formula V
wherein:
R′ is a cyano alkene;
R 3 and R 4 are each independently H or a C 1-6 alkyl; and
X 1 and X 2 are each O.
2 . The method according to claim 1 , wherein the M 2+ metal ions are selected from the group consisting of: Mn 2+ , Fe 2+ , Ca 2+ and other divalent metal ions.
3 . The method according to claim 1 , wherein the metal-based cathode material is an Mn-based cathode material.
4 . The method according to claim 1 , wherein the organic compound is Compound A
5 . An electrolyte comprising the organic compound as defined in claim 1 .
6 . A Li-ion battery comprising the electrolyte as defined in claim 5 .