FINE PARTICLE MIXTURE, ACTIVE MATERIAL AGGREGATE, POSITIVE ELECTRODE ACTIVE MATERIAL, POSITIVE ELECTRODE, SECONDARY BATTERY AND METHOD FOR PRODUCING THESE

摘要

PROBLEM TO BE SOLVED: To provide a fine particle mixture which can be converted to a precursor of a lithium transition metal silicate-based compound with a small particle size and low crystallinity, and to provide a positive electrode active material containing a lithium transition metal silicate-based compound and performing charge and discharge reactions in a room-temperature environment.

SOLUTION: The fine particle mixture is a mixture of silicon oxide fine particles, transition metal oxide fine particles and lithium transition metal silicate fine particles, and has diffraction peaks near 2θ=33.1° and near 2θ=35.7° in a powder X-ray diffraction measurement, wherein the silicon oxide fine particles and the transition metal oxide fine particles are amorphous and the lithium transition metal silicate fine particles are microcrystalline or amorphous. The positive electrode active material is obtained by pulverizing an active material aggregate obtained by heat treating the fine particle mixture.

COPYRIGHT: (C)2011,JPO&INPIT