Method for recycling waste lithium iron phosphate cathode materials in iron-nickel batteries

Abstract

The invention discloses a method for recycling a waste lithium iron phosphate positive electrode material and applying the recycled waste lithium iron phosphate positive electrode material to a nickel-iron battery, belonging to the field of recovery technologies for lithium iron phosphate positive electrode materials in waste lithium ion batteries and the field of alkaline secondary batteries. According to a technical scheme in the invention, the waste lithium iron phosphate positive electrode material is used as a raw material; a saturated ferric salt solution is added into and uniformly mixed with the waste lithium iron phosphate positive electrode material; then the obtained mixture is subjected to calcining in an inert atmosphere so as to prepare a lithium iron phosphate-based composite material; and the lithium iron phosphate-based composite material is used for preparation of the negative electrode of the nickel-iron battery. The method provided by the invention can efficiently recycle the waste lithium iron phosphate positive electrode material and apply the recycled waste lithium iron phosphate positive electrode material to the negative electrode of the nickel-iron battery, so cyclic regeneration and utilization of the waste lithium iron phosphate positive electrode material are realized.

Description

technical field [0001] The invention belongs to the field of recovery technology of lithium iron phosphate positive electrode materials of waste lithium ion batteries and alkaline secondary batteries, and specifically relates to a method for resource recycling of waste lithium iron phosphate positive electrode materials in iron-nickel batteries. Background technique [0002] In recent years, thanks to the continuous policy support of the Chinese government, the gradual strengthening of the public's awareness of environmental protection, and the continuous efforts of a number of domestic universities, research institutes and enterprises in the research and development of power batteries, battery management systems, etc., my country's The electric vehicle market has developed rapidly. With the rapid industrialization of new energy vehicles, their sales will increase by leaps and bounds, and the amount of lithium-ion power batteries will also increase exponentially. At the same...

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Problems solved by technology

The inventor has studied the methods of solid phase repair and hydrothermal repair, and found that it is difficult to completely restore the electrochemical activity of the positive electrode material in this method. Including the number of cycles and whether there is indiscriminate use, etc.), the properties of recycled materials will vary greatly (including particle size, processing performance, specific surface area, carbon content, etc.)

As we all know, lithium iron phosphate power batteries usually have high requirements for various technical indicators of positive electrode materials, and the inventor believes that it is difficult to realize its simple repair and regeneration for power batteries