Method for recovering and repairing 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: 2017-10-20
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 r

Method used

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  • Method for recovering and repairing lithium iron phosphate material
  • Method for recovering and repairing lithium iron phosphate material
  • Method for recovering and repairing lithium iron phosphate material

Examples

Experimental program
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Effect test

Embodiment 1

[0038] Collect the positive leftover material in the coating and cutting process, and heat it step by step 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. After holding for 1 hour, the temperature changes from 100°C is increased to 400°C at a rate of 5°C / min, heating and holding for 1.5h, 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 . After separating the aluminum foil and the electrode material on the heated positive electrode scrap, the electrode material containing acetylene black can be obtained directly.

Embodiment 2

[0040] Using the defective batteries in the formation stage during the battery production process as raw materials, after dismantling the discharge, cut the positive electrode pieces of the disassembled lithium-ion battery after the discharge treatment, and put the inert gas in a heating furnace with a gas collection device Step by step heating under protection. First, the temperature is raised from room temperature to 90°C at a rate of 5°C / min, and after holding for 1.5 hours, the temperature is raised from 90°C to 450°C at a rate of 5°C / min, heating and holding for 1 hour, heating and holding The gas released during the process is collected and absorbed by a gas collection device, and 1.5 mol / L of 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, an electrode material containing acetylene black can be obtained directly.

Embodiment 3

[0042] Recycling used waste batteries as raw materials, after dismantling the discharge, cut the positive electrode pieces of the disassembled lithium-ion battery after discharge treatment, and heat step by step in a heating furnace with a gas collection device under the protection of inert gas First, the temperature is increased from room temperature to 90°C at a rate of 5°C / min. After holding for 1 hour, the temperature is increased from 90°C to 400°C at a rate of 5°C / min. Heating and holding for 1.5 hours. The gas released during the heating and holding process passes through 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), and the corresponding element source in the recovered material ...

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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 present invention belongs to the technical field of lithium ion battery materials. More specifically, the present 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 leftovers from electrode coating and cutting processes will appear. At present, the leftovers from the factory can only be processed in the form of general waste, resulting in a great waste of resources. At the same time, 3% of defective products appear in the battery formation process, and effective recycling is often not carried out. [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 a...

Claims

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Application Information

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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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