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Method for separating positive electrode, negative electrode and diaphragm of LiFePO4 battery

A diaphragm separation and battery technology, applied in battery recycling, recycling technology, recycling by waste collectors, etc., to achieve good separation effect and simplified recycling steps

Active Publication Date: 2013-12-25
STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In laboratory experiments, the positive and negative electrodes and the separator can be separated manually. For example, the Chinese patent application with the patent publication number CN102017276A (application number 200980100912.3) discloses a method for manually separating the positive electrode, the negative electrode, and the separator. However, in industrial production, There must be an easy and efficient way to do this

Method used

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  • Method for separating positive electrode, negative electrode and diaphragm of LiFePO4 battery
  • Method for separating positive electrode, negative electrode and diaphragm of LiFePO4 battery
  • Method for separating positive electrode, negative electrode and diaphragm of LiFePO4 battery

Examples

Experimental program
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Effect test

Embodiment 1

[0020] like figure 1 As shown, a LiFePO 4 The method for separating positive and negative poles and separators of batteries comprises the following steps:

[0021] a. LiFePO with shell removed 4 The core of the aluminum-plastic soft pack battery (including positive, negative and separator mixture), mechanically crushed into a size of 1cm 2 fragments of

[0022] b. If figure 1 As shown, place a large amount above 1cm 2 The fragments are uniformly fed to the conveyor belt 2 by the feeder 1, and the width of the conveyor belt 2 is 1m, so that the fragments are flattened on the conveyor belt 2 and advance at a constant speed. A circular magnet with a magnetic field strength of 15,000 gauss and a diameter of 1m is set above the conveyor belt. The suspended magnet 4 is 5cm away from the surface of the conveyor belt. During work, the positive electrode material is adsorbed by magnetic force. The conveyor belt advances to the end to be collected. When the feeding and transmis...

Embodiment 2

[0025] like figure 2 As shown, a LiFePO 4 The method for separating positive and negative poles and diaphragms of batteries comprises the following steps:

[0026] a. LiFePO with shell removed 4 The cell of the aluminum shell battery (including positive, negative and diaphragm mixture), mechanically crushed into a size of 100cm 2 fragments of

[0027] b. Put a large amount of the above 100cm 2 The fragments are evenly fed to the conveyor belt 2 by the feeder 1, and the width of the conveyor belt 2 is 1m. The fragments are spread on the conveyor belt and advance at a constant speed. At the end of the conveyor belt is a magnetic roller 3 with a magnetic field strength of 10,000 gauss. When the conveyor belt is driven by rotation, it absorbs the positive pole material. The negative pole and the diaphragm have no adsorption force and are separated from the conveyor belt by gravity. The positive pole rotates to the back with the magnetic roller and then detaches. conveyor bel...

Embodiment 3

[0030] like image 3 As shown, a LiFePO 4 The method for separating positive and negative poles and diaphragms of batteries comprises the following steps:

[0031] a. LiFePO with shell removed 4 The cell of the steel shell battery (including positive, negative and diaphragm mixture), mechanically crushed into a size of 50cm 2 fragments of

[0032] b. Put a large amount of the above 100cm 2 The fragments are evenly fed to the conveyor belt 2 by the feeder 1, and the width of the conveyor belt 2 is 1m. The fragments are spread on the conveyor belt and advance at a constant speed. At the end of the conveyor belt are two magnetic rollers 3 with a magnetic field strength of 5000 gauss. While the conveyor belt is driven by rotation, the positive electrode material is adsorbed. The negative electrode and the diaphragm have no adsorption force and are detached from the conveyor belt by gravity. The absorbed positive electrode material passes through a conveyor belt again. And the...

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Abstract

The invention relates to a method for separating a positive electrode, a negative electrode and a diaphragm of a LiFePO4 battery. The method comprises the following steps: a, mechanically crushing a core (comprising a mixture of the positive electrode, the negative electrode and the diaphragm) of a shelled LiFePO4 battery into fragments with the sizes of 1 cm<2> to 100 cm<2>; b, uniformly feeding the fragments to a conveying belt by using a feeding machine, wherein the fragments are flatly paved on the conveying belt and move forwards at a constant speed, and a magnet is arranged above the conveying belt or a magnetic roller is adopted to separate the magnetic positive electrode material from negative electrode material and the diaphragm; and c, soaking the negative electrode material and the diaphragm material, which are obtained after the positive electrode material is separated, into water, collecting the diaphragm material which floats on the upper layer, and refloating and collecting the negative positive electrode material which is settled at the bottom so as to separate the negative electrode from the diaphragm. With the method, the positive electrodes, the negative electrodes and the diaphragms of the LiFePO4 batteries can be separated conveniently, quickly and efficiently on a large scale, and possible environmental harm caused by organic solvents, high-temperature heating method and the like is avoided.

Description

technical field [0001] The content of the present invention belongs to the technical field of recycling and processing of waste batteries, and in particular relates to a LiFePO 4 A method for separating the positive electrode, the negative electrode and the diaphragm of the battery cell. Background technique [0002] The positive and negative electrode materials, electrolytes, and electrolyte solvents of lithium-ion batteries have certain impacts on the environment and human health. As the number of spent lithium-ion batteries increases, the cumulative effect of pollution increases. The United States has classified lithium-ion batteries as a battery with flammability, leaching toxicity, corrosion, reactivity and other toxic and harmful properties. It is the battery that contains the most toxic substances among all types of batteries. If batteries are discarded randomly in the environment, harmful substances will enter the soil and water bodies to cause pollution, and event...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/54
CPCY02W30/84
Inventor 李东梅唐国鹏王锋超何睦赵光金
Owner STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST
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