A recovery method for lithium iron phosphate material

A technology of lithium iron phosphate and a repair method, which is applied in battery recycling, recycling technology, recycling by waste collectors, etc., can solve problems such as long recycling process, and achieve the effect of avoiding waste of resources

Active Publication Date: 2020-03-24
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to: overcome the defects such as the long recycling process existing in the recycling of existing electrode materials, and provide a method for recycling and repairing lithium iron phosphate materials

Method used

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  • A recovery method for lithium iron phosphate material
  • A recovery method for lithium iron phosphate material
  • A recovery method for lithium iron phosphate material

Examples

Experimental program
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Effect test

Embodiment 1

[0038] Collect positive scraps from the coating and cutting process, and heat them step by step with an inert gas in a heating furnace with a gas collection device. The temperature is first raised from room temperature to 100°C at a rate of 5°C / min, and after holding for 1 hour, the temperature is changed from 100°C to 400°C at a rate of 5°C / min, heating and holding for 1.5 hours, the gas released during heating and holding is collected and absorbed by the gas collection device, and 1.0mol / L gas collection liquid sodium hydroxide solution is used to eliminate gas toxicity . The electrode material containing acetylene black that can be directly used is obtained after the aluminum foil on the heated positive electrode scrap is separated from the electrode material.

Embodiment 2

[0040] In the battery production process, the defective batteries in the formation stage are used as raw materials. After discharge and disassembly, the positive electrode pieces of the disassembled lithium-ion batteries after discharge treatment are cut into pieces, and the inert gas is placed in a heating furnace with a gas collection device. Heating step by step under protection, first the temperature is raised from room temperature to 90°C at a rate of 5°C / min, and after 1.5 hours of heat preservation, the temperature is raised from 90°C to 450°C at a speed of 5°C / min, heated and kept for 1 hour, and heated and kept The gas released during the process is collected and absorbed by the gas collection device, and 1.5mol / L gas collection liquid sodium hydroxide solution is used to eliminate gas toxicity. After the aluminum foil on the heated electrode sheet is separated from the electrode material, the electrode material containing acetylene black that can be used directly is o...

Embodiment 3

[0042]Recycled used waste batteries are used as raw materials. After discharge and disassembly, the positive electrode pieces of the disassembled lithium-ion batteries after discharge treatment are cut into pieces, and heated step by step in a heating furnace with a gas collection device under the protection of an inert gas. , firstly, the temperature is raised from room temperature to 90°C at a rate of 5°C / min, and after holding for 1 hour, the temperature is raised from 90°C to 400°C at a rate of 5°C / min, and kept for 1.5 hours. The gas collection device collects and absorbs, and uses 1.5mol / L gas collection liquid sodium hydroxide solution to eliminate gas toxicity. After the aluminum foil on the heated electrode sheet is separated from the electrode material, the content of each element in the material is tested by an inductively coupled plasma spectrometer (ICP). : The molar ratio of phosphorus is 1.05:1:1, calculate the molar mass of the recycled material after supplemen...

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Abstract

The invention discloses a method for recovering and repairing a lithium iron phosphate material. The method disclosed by the invention comprises the following steps: by taking positive leftover materials in a battery production process, positive plates obtained after dismantling defective batteries and / or positive plates obtained by recovering and dismantling waste batteries as raw materials, heating, maintaining the temperature, and separating current collector aluminum foils so as to obtain the recovered lithium iron phosphate material; and repairing the lithium iron phosphate material in a manner of adding an element source. According to the method disclosed by the invention, more elements are added according to a stoichiometric ratio, the re-synthetic repair reaction is fully carried out, the recovered and repaired lithium iron phosphate material is a pure phase lithium iron phosphate material, and the ordinary commercial lithium iron phosphate material level can be reached. The method uses lithium iron phosphate in the battery production process and the recovery phase and has the advantage of capacity of realizing closed cycle.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery materials, and more specifically, the invention relates to a method for recovering and repairing lithium iron phosphate materials in lithium ion batteries. Background technique [0002] In the battery production process, about 1% of the electrode coating and cutting process scraps will appear. At present, the scraps of the factory can only be disposed of in the form of general waste, resulting in a huge waste of resources. At the same time, there are 3% defective products in the battery formation process, which are often not recycled effectively. [0003] According to statistics from the Battery Professional Committee of the China Electronics Energy Conservation Technology Association and the China Battery Alliance, the global demand for power batteries in 2016 was 41.6GWh, and the demand for the four main types of power lithium-ion batteries, LFP, NCA, NCM and LMO, was 23.9GWh respect...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/54
CPCH01M10/54Y02W30/84
Inventor 陈永珍宋文吉冯自平秦坤韩颖
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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