POSITIVE ELECTRODE MATERIAL COMPOSITION, POSITIVE ELECTRODE SHEET AND PREPARATION METHOD THEREFOR, BATTERY, AND ELECTRICAL DEVICE

The present application provides a positive electrode material composition, a positive electrode plate and a preparation method therefor, a battery, and an electrical device. The positive electrode material composition includes a positive electrode active material and optionally, an optional positive electrode conductive agent, the positive electrode active material includes a core and a shell on at least a portion of a surface of the core, the core includes lithium phosphate, the shell includes a carbon material, a graphitization degree of the positive electrode active material is denoted as g1, a mass percentage of the positive electrode conductive agent in the positive electrode material composition is denoted as wi, 10% ≤ gi ≤ 50%, and 0% ≤ wi ≤ 1%. The battery can have both high energy density and good rate performance.