A kind of method that utilizes lithium iron phosphate waste material to prepare lithium iron phosphate lithium ion battery cathode material

Abstract

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 cost is further reduced. Through the lithium iron phosphate waste materials for producing the lithium ion battery cathode material lithium iron phosphate, more than 50% of production cost is reduced and high economic and social benefit are achieved.

Description

technical field [0001] The invention relates to a method for regenerating waste lithium iron phosphate, a positive electrode material of a lithium ion battery, in particular to a method for preparing lithium iron phosphate, a positive electrode material for a lithium ion battery, by utilizing lithium iron phosphate waste. Background technique [0002] Currently, LiFePO 4 Lithium-ion secondary batteries as cathode materials are more and more widely used in technical fields such as electric tools and electric vehicles because of their low cost and good safety performance. With LiFePO 4 A large number of applications for lithium-ion secondary batteries as cathode materials, LiFePO 4 The production of materials is growing rapidly. But in LiFePO phosphate 4 During the production process of materials, some unqualified products will inevitably be produced, such as the electrical properties of the materials are not up to standard or the particle size distribution does not meet t...

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Problems solved by technology

But in LiFePO phosphate 4 During the production process of materials, some unqualified products will inevitably be produced, such as the electrical properties of the materials are not up to standard or the particle size distribution does not meet the requirements.

At the same time, there are still a large number of waste lithium-ion batteries that cannot be recycled reasonably. The accumulation of these waste lithium-ion batteries not only causes a waste of resources, but also causes serious pollution to the environment.

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