Method for preparing carbon-coated LiFePO4 by microwaves and carbon-coated LiFePO4 material

• Main Authors: DENG FEI, HUANG JIANFENG, ZENG XIERONG, ZOU JIZHAO, SHENG HONGCHAO
• Format: Patent
• Language: Chinese; English
• Published: 26.05.2010
• Subjects: BASIC ELECTRIC ELEMENTS; CHEMISTRY; COMPOUNDS THEREOF; ELECTRICITY; INORGANIC CHEMISTRY; METALLURGY; NON-METALLIC ELEMENTS; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

The invention provides a method for preparing carbon-coated LiFePO4 by microwaves, which comprises the following steps: respectively obtaining a lithium source compound, a ferrous iron source compound and a phosphorous source compound in a stoichiometric ratio of the LiFePO4 required to be prepared, and adding a microwave absorber, an organic carbon source and a liquid dispersant; performing ball milling on the obtained raw material and drying treatment; putting the dried product in a microwave heating reaction cavity, and introducing protective gas into the reaction cavity; and heating to the temperature of between 550 and 850DEG C with the microwaves, introducing carbon source gas, and performing pyrolysis on the carbon source gas at the temperature of between 550 and 850DEG C to prepare the carbon-coated LiFePO4. The invention also provides a carbon-coated LiFePO4 material prepared by the method. The preparation method adopts microwave heating, and the carbon source gas is subjected to pyrolysis, so that t