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A method for producing lithium iron phosphate precursor using decommissioned lithium iron phosphate battery as raw material

A lithium iron phosphate battery and lithium iron phosphate technology, applied in battery electrodes, secondary batteries, battery recycling, etc., can solve the problems of multiple aluminum foil separation processes, large environmental pollution, and high recycling costs, and achieve good cycle performance and capacity retention The effect of low harm to the efficiency, environment and operators, and low recycling cost

Active Publication Date: 2022-06-03
CONTEMPORARY AMPEREX TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, there are many aluminum foil separation processes, high impurity content in recycled lithium iron phosphate materials, high recycling costs, and large environmental pollution.

Method used

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  • A method for producing lithium iron phosphate precursor using decommissioned lithium iron phosphate battery as raw material
  • A method for producing lithium iron phosphate precursor using decommissioned lithium iron phosphate battery as raw material
  • A method for producing lithium iron phosphate precursor using decommissioned lithium iron phosphate battery as raw material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～4

[0039] Examples 1 to 4 adopt the following methods to produce lithium iron phosphate precursors from decommissioned lithium iron phosphate batteries as raw materials.

[0040] (1) Recycling and discharging of decommissioned batteries: A decommissioned lithium iron phosphate battery with a capacity of 100Ah decayed to 80% is immersed in water for discharge, and then disassembled to obtain a battery cell.

[0041] (2) Acid soaking of battery cells: break the battery cells, soak them in acid for dissolution, and keep stirring or heating up during the process of soaking acid to increase the reaction rate. During the soaking process, lithium iron phosphate, aluminum foil and a small amount of copper foil will be dissolved, and the separator, most of the copper foil, graphite, the binder and conductive agent of the positive electrode will not be dissolved. In the process of acid dissolution of the cell, the reaction of aluminum and hydrochloric acid will generate a large amount of h...

Embodiment 5～8

[0047] Steps (1) to (4) and (6) of Examples 5 to 8 are the same as those of Examples 1 to 4, and the difference is only in step (5). In step (5) of Examples 5-8, that is, in the step of precipitating iron phosphate, pH is not adjusted by adding alkali to the solution after the oxidation reaction, but electrolysis is used to adjust pH. Specifically: adding a carbon plate cathode and a carbon plate anode to the solution after the oxidation reaction, and performing electrolysis, the reaction of the cathode is 2H + +2e - →H 2 ↑, thus, the hydrogen ion concentration in the electrolyte gradually decreases, and the alkalinity gradually increases.

[0048] The specific reagents and parameters in Examples 1-8 are shown in Table 1 below.

[0049] Table 1 Specific reagents and parameters of Examples 1 to 8

[0050]

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PUM

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Abstract

A method for producing lithium iron phosphate precursors using decommissioned lithium iron phosphate batteries as raw materials, comprising the following steps: soaking acid in cells, recovering copper by electrolysis, oxidizing ferrous iron, precipitating iron phosphate, and precipitating lithium carbonate. After the precipitation is completed, one step The lithium iron phosphate precursor can be obtained by recycling.

Description

technical field [0001] The present application relates to the field of batteries, and in particular, to a method for producing a lithium iron phosphate precursor by using a retired lithium iron phosphate battery as a raw material. Background technique [0002] In recent years, the new energy vehicle industry is facing a situation of rapid development. With the explosive growth of the new energy vehicle industry, the consumption of power batteries, which are the "heart" of new energy vehicles, continues to increase. At the same time, more and more power batteries will reach retirement status. If these retired batteries are not properly disposed of, they will not only cause serious pollution to the environment, but also a waste of resources. [0003] At present, researchers at home and abroad have done some research on the recovery and regeneration of lithium iron phosphate batteries, but the existing methods still have various defects. For example, there are many problems ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/37C01D15/08H01M4/58H01M10/54
CPCC01B25/375C01D15/08H01M10/54H01M4/5825C01P2004/80C01P2006/80C01B25/45Y02W30/84C25C1/12H01M10/0525
Inventor 林永寿王国宝王珂刘江姚斌
Owner CONTEMPORARY AMPEREX TECH CO