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Abstract

Process for making a cathode comprising the following steps (a) Providing a cathode active material selected from layered lithium transition metal oxides, lithiated spinels, lithium transition metal phosphate with olivine structure, and lithium nickel-cobalt aluminum oxides, (b) treating said cathode active material with an oligomer bearing units according to general formula (I a), wherein R¹ are the same or different and selected from hydrogen and C₁-C₄-alkyl, aryl, and C₄-C₇-cycloalkyl, R² and R³ are selected independently at each occurrence from phenyl and C₁-C₈-alkyl, C₄-C₇-cycloalkyl, C₁-C₈-haloalkyl, OPR¹(O)—*, and —(CR⁹₂)_p—Si(R²)₂—* wherein one or more non-vicinal CR⁹₂ groups may be replaced by oxygen, R⁹ is selected independently at each occurrence from H and C₁-C₄-alkyl, and p is a variable from zero to 6, and wherein the overall majority of R² and R³ is selected from C₁-C₈-alkyl, and, optionally, at least one of carbon in electrically conductive form and, optionally, a binder, c) applying a slurry of said treated cathode active material to a current collector, and d) at least partially removing solvent used in step (c).

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First Claim