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Method for recycling waste lithium iron phosphate batteries

A technology of lithium iron phosphate battery and recycling method, which is applied in the direction of battery recycling, waste collector recycling, recycling technology, etc., can solve the problems of high price, poor safety, unfriendly environment, etc., and achieve low production cost, quick effect, The effect of good electrochemical performance

Inactive Publication Date: 2012-09-12
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In commercial lithium-ion batteries, the most widely used cathode material is LiCoO 2 , but LiCoO 2 Expensive, not environmentally friendly, and poor safety, so researchers from all over the world have never stopped researching and developing new cathode materials

Method used

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  • Method for recycling waste lithium iron phosphate batteries
  • Method for recycling waste lithium iron phosphate batteries
  • Method for recycling waste lithium iron phosphate batteries

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0022] Specific implementation mode one: the recycling method of waste lithium iron phosphate battery in this implementation mode is as follows:

[0023] 1. Remove the residual power of the waste lithium iron phosphate battery, take out the battery cell and crush it into cell fragments, soak the cell fragments in sodium hydroxide solution and stir them, and perform ultrasonic oscillation while stirring, then filter, wash and dry And vibrating sieving, the pure aluminum, pure copper and diaphragm obtained on the sieve, among which the aluminum and copper are recovered through smelting, and the mixed powder is obtained under the sieve;

[0024] 2. Wash the mixed powder with acid solution for 1 to 3 minutes, and then dry;

[0025] 3. Heat-treat the mixed powder processed in step 2 at a temperature of 150°C to 450°C for 2h to 8h;

[0026] 4. Detect the mixed powder treated in step 3. According to the content of lithium, iron, phosphorus and carbon, adjust the lithium, iron, lithi...

specific Embodiment approach 2

[0035] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that the inert gas described in step 5 is argon or argon-hydrogen mixed gas, and the hydrogen in the argon-hydrogen mixed gas accounts for 5% to 50% of the total volume of the argon-hydrogen mixed gas. %. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0036] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the concentration of the sodium hydroxide solution in step 1 is 0.4 mol / L. Others are the same as in the first or second embodiment.

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Abstract

A method for recycling waste lithium iron phosphate batteries relates to a battery recycling method. The method provided by the invention aims to provide a battery recycling method which is simple in process and low in cost. The method comprises the following steps of: removing residual electric quantity of a waste lithium iron phosphate battery, taking out the cell of the battery and crashing the cell into fragments, soaking the cell fragments in sodium hydroxide solution and stirring; and then performing filtering, washing, drying and vibratory screening so as to obtain pure alumium, pure copper and a diaphragm on a screen, recycling alumium and copper through smelting so as to obtain mixed powder under the screen, cleaning the mixed powder by using acidic solution, performing drying and thermal treatment, adjusting the mol ratio of lithium to iron to phosphorus to carbon, and then performing ball milling, drying and roasting, thereby obtaining a lithium iron phosphate anode material. The method for efficiently recycling the waste lithium iron phosphate batteries provided by the invention is simple in process, low in production cost and quick in taking effect.

Description

technical field [0001] The invention relates to a battery recycling method. Background technique [0002] Lithium-ion batteries are widely used in modern electronic devices due to their high energy density, light weight, long life and no memory effect. With the rapid development of the economy and the trend of miniaturization of electrical appliances, its development prospects are broad. Energy depletion and environmental pollution have become problems that the current society has to face and urgently need to solve. Therefore, more and more countries pay attention to electric vehicles and hybrid electric vehicles. [0003] As a power source, there is no battery that can be compared with petroleum, and the power battery has become a bottleneck restricting the development of electric vehicles and hybrid electric vehicles. At present, due to the low specific energy of VRLA batteries and Ni-MH batteries, it is too early for proton exchange membrane fuel cells to be commerciali...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/54
CPCY02W30/84
Inventor 戴长松潘英俊刘元龙王洪彩郑茹娟贾铮赵力熊岳平路密黄兵
Owner HARBIN INST OF TECH
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