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Method for regenerating lithium iron phosphate by leaching, spray drying and solid phase method

A technology of lithium iron phosphate and solid-phase method, which is applied in recycling technology, recycling by waste collectors, electrical components, etc., can solve problems such as poor chemical properties and complicated process of regenerating lithium iron phosphate, and achieve good dispersion and good circulation Stability and reversibility, good effect of crystallinity

Inactive Publication Date: 2019-08-06
KUNMING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the poor electrochemical performance of regenerated lithium iron phosphate and the complex process of regenerating lithium iron phosphate by leaching-precipitation-solid-phase method in the prior art, the present invention provides a method for regenerating lithium iron phosphate by leaching-spray drying-solid-phase method , the lithium iron phosphate regenerated in the present invention is a fine particle of solid spheres and hollow spheres, with uniform particle size distribution, good dispersion, fluidity, and excellent electrochemical performance

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  • Method for regenerating lithium iron phosphate by leaching, spray drying and solid phase method
  • Method for regenerating lithium iron phosphate by leaching, spray drying and solid phase method
  • Method for regenerating lithium iron phosphate by leaching, spray drying and solid phase method

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Embodiment 1

[0030] Embodiment 1: A method for regenerating lithium iron phosphate by leaching-spray drying-solid phase method, the specific steps are as follows:

[0031] (1) Put the waste lithium iron phosphate battery in the salt solution (Na 2 SO 4 solution), where the salt solution (Na 2 SO 4 solution) with a mass concentration of 3%; then manually disassemble and separate the positive electrode sheet;

[0032] (2) Heat and calcinate the positive electrode sheet in step (1) to obtain aluminum foil and waste lithium iron phosphate positive electrode; the temperature of calcination is 500°C, and the time is 2h;

[0033] (3) Washing, drying, and pulverizing the waste lithium iron phosphate in step (2) to obtain waste lithium iron phosphate cathode powder;

[0034] (4) Add the waste lithium iron phosphate positive electrode powder in step (3) into the acid solution (hydrochloric acid) for leaching to obtain a leaching solution; the concentration of the acid solution (hydrochloric acid...

Embodiment 2

[0044] Example 2: The method of regenerating lithium iron phosphate by leaching-spray drying-solid-phase method in this example is basically the same as the method of regenerating lithium iron phosphate by leaching-spray drying-solid-phase method in Example 1, except that: The salt solution in (1) is sodium nitrate, and the mass concentration of the salt solution (sodium nitrate) is 5%; the temperature of calcination in step (2) is 400°C, and the time is 5h; the acid solution (hydrochloric acid) in step (4) The concentration is 0.5mol / L; In step (5), the lithium source is lithium hydroxide, the iron source is ferric chloride, and the phosphorus source is diammonium hydrogen phosphate;

[0045] The lithium iron phosphate regenerated in this embodiment is assembled into a 2025 button battery according to the conventional method, and its electrochemical performance is tested: the first charge and discharge curve of the regenerated lithium iron phosphate in this embodiment shows th...

Embodiment 3

[0048] Example 3: The method of regenerating lithium iron phosphate by leaching-spray drying-solid-phase method in this example is basically the same as the method of regenerating lithium iron phosphate by leaching-spray drying-solid-phase method in Example 1, except that: The salt solution in (1) is potassium nitrate, and the mass concentration of the salt solution (potassium nitrate) is 1%; the temperature of calcination in step (2) is 600°C, and the time is 0.5h; the acid solution (sulfuric acid) in step (4) ) concentration is 1.0 mol / L; in step (5), the lithium source and the phosphorus source are lithium phosphate, and the iron source is iron powder;

[0049] The lithium iron phosphate regenerated in this embodiment is assembled into a 2025 button battery according to the conventional method, and its electrochemical performance is tested: the first charge and discharge curve of the regenerated lithium iron phosphate in this embodiment shows that the regenerated lithium iro...

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Abstract

The invention discloses a method for regenerating lithium iron phosphate by a leaching, spray drying and solid phase method, and belongs to the field of waste battery recycling. The method comprises the steps of discharging a waste lithium iron phosphate battery in a salt solution, then disassembling to separate a positive pole piece; separating the positive pole piece obtained in the previous step to obtain an aluminum foil and a waste lithium iron phosphate positive electrode, adding the waste lithium iron phosphate positive electrode powder into an acid solution to leach so as to obtain a leachate; additionally adding a lithium source, an iron source and a phosphorus source to the leachate, and adding a carbon source and a metal cation doped compound to prepare a precursor solution; carrying out spray drying on the precursor solution to obtain precursor powder; and carrying out two-stage calcining on the precursor powder in the atmosphere of argon or argon-hydrogen mixture to obtainmetal cation doped regenerated lithium iron phosphate. The regenerated lithium iron phosphate prepared according to the method of the invention has the advantages of stable structure, high specific capacity and excellent cycle performance and rate performance.

Description

technical field [0001] The invention relates to a method for regenerating lithium iron phosphate by leaching-spray drying-solid-phase method, and belongs to the technical field of recovery and regeneration of waste lithium ion batteries. Background technique [0002] Lithium-ion batteries have the advantages of high discharge voltage, large specific energy, small self-discharge, long cycle life, and no memory effect. They have gradually replaced traditional secondary power supplies and are widely used in portable electronic devices, electric vehicles, space technology, and defense industries. and other fields. In recent years, my country has accelerated the development and utilization of renewable energy, vigorously developed wind power generation, solar power generation, etc., and the amount of lithium-ion batteries in the field of energy storage materials has increased year by year. Because lithium iron phosphate batteries have good safety, good high temperature performan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/54H01M4/36H01M4/58H01M4/62
CPCH01M10/54H01M4/366H01M4/5825H01M4/62Y02W30/84Y02E60/10
Inventor 张英杰段建国许斌董鹏
Owner KUNMING UNIV OF SCI & TECH
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