Method of preparing lithium ion battery cathode material lithium iron phosphate with lithium iron phosphate waste material

• Main Authors: JIA XIAOLIN, LIU XINBAO
• Format: Patent
• Language: Chinese; English
• Published: 26.10.2016
• Subjects: BASIC ELECTRIC ELEMENTS; CHEMISTRY; CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATERTREATMENT OR WASTE MANAGEMENT; COMPOUNDS THEREOF; ELECTRICITY; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; INORGANIC CHEMISTRY; METALLURGY; NON-METALLIC ELEMENTS; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE

The invention discloses a method of preparing a lithium ion battery cathode material lithium iron phosphate with lithium iron phosphate waste materials. The method includes the steps of: 1) mixing phosphoric acid, as a liquid raw material, with other solid raw materials, and adding pure water to form a paste mixture; 2) performing microwave-heating pre-treatment to the paste mixture to obtain a precursor; and 3) adding a water-soluble carbon source compound water solution to the precursor and mixing and ball-milling the components, and microwave-heating the mixture to obtain the material. In the method, the precursor and the water-soluble carbon source compound water solution are mixed and are ball-milled, so that the precursor is carbon-coated with the carbon source compound, thereby effectively improving product quality. During microwave heating, a CO reducing atmosphere is formed by water and carbon element in the carbon source compound water solution, so that inert gas protection is omitted and production