METHOD FOR PRODUCING LITHIUM-IRON-PHOSPHORUS COMPOUND OXIDE-CARBON COMPOSITE AND METHOD FOR PRODUCING COPRECIPITATE CONTAINING LITHIUM, IRON AND PHOSPHORUS

摘要

PROBLEM TO BE SOLVED: To provide a method for producing a lithium-iron-phosphorus compound oxide-carbon composite by which composition adjustment of Li, Fe and P of the lithium-iron-phosphorus compound oxide is easy and single-phase LiFePO4is obtained in X-ray diffraction analysis, and excellent battery performance can be imparted to a lithium secondary battery.

SOLUTION: The method for producing the lithium-iron-phosphorus compound oxide-carbon composite includes: a first step of obtaining a coprecipitate containing lithium, iron and phosphorus by adding a solution (B) containing lithium ions to a solution (C) containing lithium ions and phosphoric ions while adding a solution (A) containing divalent iron ions; a second step of obtaining a firing material mixture by mixing the coprecipitate and a conductive carbon material; and a third step of obtaining a lithium-iron-phosphorus compound oxide-carbon composite by firing the firing material mixture in an inert gas atmosphere.

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