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A kind of recycling method of waste lithium iron phosphate-lithium titanate battery

A technology of lithium titanate battery and lithium iron phosphate, which is used in battery recycling, waste collector recycling, battery electrodes, etc., can solve the problems of waste of non-ferrous metals in positive electrode materials, cumbersome purification process, consumption of large inorganic acid, etc., to improve the purity. , Simplify the recycling process and achieve the effect of recycling

Active Publication Date: 2021-01-01
合肥德锂新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the recycling of waste lithium titanate batteries, the positive electrode material and the negative electrode material are often bonded and mixed together, making it difficult to separate. Therefore, when the recovered powder is only regenerated according to the recovery method of lithium titanate material, the obtained The lithium titanate material will contain corresponding impurities, and cause waste of Li and non-ferrous metals in the positive electrode material
When a lithium titanate battery uses lithium iron phosphate as the positive electrode material, a large amount of inorganic acid will be consumed during recycling, and the solution will contain a large amount of phosphate and iron ion impurities, resulting in cumbersome subsequent purification processes and impure materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A method for recycling waste lithium iron phosphate-lithium titanate batteries, specifically comprising the following steps:

[0024] (1) Put the waste lithium iron phosphate-lithium titanate battery into the discharge cabinet to discharge below 1.0V. After the discharge is completed, the battery is crushed and separated by magnetic force to obtain the shell, copper foil, aluminum foil and positive and negative electrodes respectively. Mixing materials, collecting and processing the casing, copper foil and aluminum foil respectively;

[0025] (2) The mixture of positive and negative electrodes is subjected to high-temperature heat treatment at 300°C in the air, and the treatment time is 6 hours;

[0026] (3) Mix the high-temperature heat-treated positive and negative electrode mixture with water at a mass ratio of 1:4 and perform beating treatment for 30 minutes to obtain a beating liquid, then add hydrochloric acid with a concentration of 3mol / L, and heat at 90°C Afte...

Embodiment 2

[0030] A method for recycling waste lithium iron phosphate-lithium titanate batteries, specifically comprising the following steps:

[0031] (1) Put the waste lithium iron phosphate-lithium titanate battery into the resistance and discharge it below 1.0V. After the discharge is completed, the battery is crushed and sorted by wind to obtain the casing, copper foil, aluminum foil and positive and negative electrode mixtures respectively. , respectively collect and process the shell, copper foil and aluminum foil;

[0032] (2) The mixture of positive and negative electrodes is subjected to high-temperature heat treatment at 900°C in the air, and the treatment time is 1 hour;

[0033] (3) Mix the high-temperature heat-treated positive and negative electrode mixture and water at a mass ratio of 1:10, and then perform a beating treatment for 30 minutes to obtain a beating liquid, then add sulfuric acid with a concentration of 3mol / L, and heat at 60°C After stirring the reaction, th...

Embodiment 3

[0037] A method for recycling waste lithium iron phosphate-lithium titanate batteries, specifically comprising the following steps:

[0038] (1) Put the waste lithium iron phosphate-lithium titanate battery into the salt water pool and discharge it for 12 hours. After the discharge is completed, the battery is crushed and separated by gravity to obtain the shell, copper foil, aluminum foil and positive and negative electrode mixtures respectively. , respectively collect and process the shell, copper foil and aluminum foil;

[0039] (2) The mixture of positive and negative electrodes is subjected to high-temperature heat treatment at 500°C in the air, and the treatment time is 3 hours;

[0040] (3) Mix the high-temperature heat-treated positive and negative electrode mixture and water at a mass ratio of 1:6, and then perform beating treatment for 30 minutes to obtain a beating liquid, then add sulfuric acid with a concentration of 1.5mol / L, and heat at 80°C After the reaction ...

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Abstract

The invention discloses a recycling method for waste lithium iron phosphate-lithium titanate batteries. The recycling method comprises the steps of carrying out discharging, breakage and separation onthe waste lithium iron phosphate-lithium titanate battery, and carrying out high-temperature oxidation, pulping, filtration, concentration, hydrolysis and precipitating on anode and cathode mixtures,so as to obtain metatitanic acid and a lithium sulfate solution. According to the recycling method, the anode powder and the cathode powder in the waste lithium iron phosphate-lithium titanate batteries are simultaneously recycled, the separation difficulty of the anode and cathode mixtures in the breaking and sorting processes of the batteries is reduced, the consumption of inorganic acid in thesimultaneous recycling process of the anode powder and the cathode powder is reduced, the recycling process is simplified, the concentration of Li ions in the solution ions are increased, valuable metals in the anode powder and the cathode powder in the lithium iron phosphate-lithium titanate batteries are recycled, and the purity of the product is increased.

Description

technical field [0001] The invention relates to the field of battery recycling, in particular to a method for recycling waste lithium iron phosphate-lithium titanate batteries. Background technique [0002] Lithium titanate has a three-dimensional lithium ion diffusion channel unique to the spinel structure, and has the advantages of excellent power characteristics and good high and low temperature performance. Lithium titanate battery is a kind of lithium titanate, which is used as the negative electrode material of lithium ion battery, and can be combined with positive electrode materials such as lithium manganate, ternary materials or lithium iron phosphate to form a 2.4V or 1.9V lithium ion secondary battery. In addition, it can also be used as a positive electrode to form a 1.5V lithium secondary battery with a metal lithium or lithium alloy negative electrode. The lithium titanate negative electrode lithium ion battery has good reversibility in the charge and discharg...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/54H01M4/485H01M4/58
CPCH01M4/485H01M4/5825H01M10/54Y02E60/10Y02W30/84
Inventor 王德钊徐懋郑浩
Owner 合肥德锂新材料科技有限公司
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