Positive-electrode materials: methods for their preparation and use in lithium secondary batteries

A method of preparing a positive-electrode material for a lithium secondary battery, comprising:

• (a) providing a complex oxide compound as reactive substance;
• (b) coating the reactive substance particles surface with a carbon material;
• and
• (c) mixing the coated reactive substance with carbon black, a mixture of at least two types of fibrous carbon material different in fiber diameter and/or fiber length, and optionally a binder, wherein step (c) is performed by compression shear impact-type particle-compositing technique, wherein the complex oxide compound is a complex oxide of general formula AaMmZzOoNnFf, and
• wherein:
• A represents an alkaline metal;
• M represents a transition metal, and optionally at least one non-transition metal, or a mixture thereof;
• Z represents a non-metallic element;
• N is a nitrogen atom;
• F is a fluorine atom;
• and
• a≥0, m≥0, z≥0, o>0, n≥0 and f≥0, a, m, o, n, f and z being selected to ensure electro neutrality of the complex oxide.