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Method for producing lithium iron phosphate precursor by using retired lithium iron phosphate battery as raw material

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

Active Publication Date: 2021-06-11
CONTEMPORARY AMPEREX TECH CO
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  • 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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  • Method for producing lithium iron phosphate precursor by using retired lithium iron phosphate battery as raw material
  • Method for producing lithium iron phosphate precursor by using retired lithium iron phosphate battery as raw material
  • Method for producing lithium iron phosphate precursor by using retired lithium iron phosphate battery as raw material

Examples

Experimental program
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Effect test

Embodiment 1～4

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

[0040] (1) Recycling and discharging of decommissioned batteries: Soak a 100Ah decommissioned lithium iron phosphate battery whose capacity has declined to 80% in water for discharge, and then disassemble to obtain the battery cell.

[0041] (2) Soaking the battery in acid: Break the battery and soak it in acid to dissolve it. During the process of soaking in acid, keep stirring or raise the temperature to increase the reaction rate. During the soaking process, lithium iron phosphate, aluminum foil and a small amount of copper foil will be dissolved, but the separator, most of the copper foil, graphite, positive electrode binder and conductive agent will not be dissolved. In the process of cell acid dissolution, the reaction between aluminum and hydrochloric acid will produce a large amount of hydrogen. It is n...

Embodiment 5～8

[0047] Steps (1)-(4) and (6) of Embodiments 5-8 are the same as Embodiments 1-4, the difference is only in step (5). In the step (5) of Examples 5-8, that is, in the step of precipitating iron phosphate, the pH is not adjusted by adding alkali to the solution after the oxidation reaction, but the pH is adjusted by electrolysis. Specifically: add a carbon plate cathode and a carbon plate anode to the solution after the oxidation reaction for electrolysis, and the reaction that occurs at the cathode is 2H + +2e - →H 2 ↑, thus, the concentration of hydrogen ions 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] Concrete reagent and parameter of table 1 embodiment 1~8

[0050]

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Abstract

A method for producing a lithium iron phosphate precursor by using a retired lithium iron phosphate battery as a raw material, comprising the following steps: immersing a battery cell in an acid solution; performing electrolyzation to recover copper; oxidizing ferrous ions; precipitating iron phosphate; precipitating lithium carbonate; and after precipitation is completed, performing one-step recovery to obtain the lithium iron phosphate precursor.

Description

technical field [0001] The present application relates to the field of batteries, in particular to a method for producing lithium iron phosphate precursors from decommissioned lithium iron phosphate batteries. Background technique [0002] In recent years, the new energy vehicle industry is facing rapid development. With the explosive growth of the new energy vehicle industry, the use 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 decommissioned batteries are not properly disposed of, it will not only cause serious pollution to the environment, but also be a waste of resources. [0003] At present, researchers at home and abroad have done some research on lithium iron phosphate battery recycling and regeneration of lithium iron phosphate materials, but the existing methods still have various defects. For example, there are many aluminum foil sep...

Claims

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Application Information

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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
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