▎ 摘　　要

NOVELTY - Aggregate comprises lithium silicon oxide particles comprising core particles comprising silicon, oxygen and lithium, where the molar ratio of each element in the core particles are lithium element/silicon element is X is 0.1-2 and oxygen element/silicon element is Y is 0.5-1.5, a silicon carbide shell layer covering the core particles and a carbon layer bonding and coating a multiple of the lithium silicon oxide particles. USE - Used as aggregate. ADVANTAGE - The aggregate has good water resistance, low expansion rate and high circulation retention rate. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: (1) preparing aggregate, comprising (i) treating surface of silica particles, (ii) forming aggregates, a carbon layer, and a silicon carbide layer, mixing, granulating, and heat-treating the silicon-oxygen particles with the carbon precursor material and (iii) performing lithium insertion treatment on the silicon-oxygen particle aggregates with silicon carbide layer and carbon layer; (2) cathode material comprises aggregate; and (3) a pole piece comprises cathode material. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic representation of the aggregate.