METHOD FOR SELECTIVE OXIDATION-REDUCTION REGENERATION FROM WASTE LITHIUM IRON PHOSPHATE, REGENERATED LITHIUM IRON PHOSPHATE, AND LITHIUM ION BATTERY

摘要

Disclosed are a method for selective oxidation-reduction regeneration from waste lithium iron phosphate, regenerated lithium iron phosphate, and a lithium ion battery. The method comprises: performing primary sintering on waste lithium iron phosphate under the condition of introducing a mild oxidizing gas; separating lithium iron phosphate powder; using a lithium source and a carbon source to perform lithium and carbon supplementing and composition adjustment on the lithium iron phosphate powder by means of secondary sintering to obtain regenerated lithium iron phosphate, wherein the mild oxidizing gas is water vapor, CO ₂ gas, or a mixed gas of both. By means of the method of the present application, lithium iron phosphate with excellent performance can be prepared. The material has the electrochemical characteristics of excellent cycle performance under normal temperature and high temperature as well as high compaction density, and also has the advantage of low cost.