Low-energy-consumption and low-Al-content recovery method for lithium iron phosphate positive plate

A technology for lithium iron phosphate and recovery methods, which is applied in the direction of chemical instruments and methods, positive electrodes, battery recovery, etc., can solve the problems of unfavorable industrial application, high calcination temperature, and high recovery energy consumption, so as to shorten calcination time and reduce calcination The effect of temperature and low energy consumption

Active Publication Date: 2021-01-15
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method has high calcination temperature and long calcination time, so the recovery energy consumption is high, which is not conducive to industrial application

Method used

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  • Low-energy-consumption and low-Al-content recovery method for lithium iron phosphate positive plate
  • Low-energy-consumption and low-Al-content recovery method for lithium iron phosphate positive plate
  • Low-energy-consumption and low-Al-content recovery method for lithium iron phosphate positive plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] A method for recovering lithium iron phosphate cathode sheet with low energy consumption and low Al content, comprising the following steps:

[0049] S1. Use a crusher to crush the lithium iron phosphate cathode sheet to be recovered into coarse particles, and control the particle size to about 5-10 mm to obtain a crushed material;

[0050] S2. Use a roller furnace to put a broken material in N 2 Calcining under the atmosphere, set the temperature of the holding zone to 450°C, the heating time is 2h, the holding time is 1h, and after cooling to below 95°C, it is released from the furnace to obtain the calcined material;

[0051] S3. Grinding the calcined material with a pulverizer into a powder with a particle size D50 between 50 and 80 μm to obtain a secondary crushed material;

[0052] S4. Classify the secondary crushed material with an airflow classifier, screen out the Al element therein, and obtain a lithium iron phosphate positive electrode material with a low Al...

Embodiment 2～6 and comparative example 1～7

[0055] Compared with Example 1, the recovery method of lithium iron phosphate positive electrode sheet provided by Examples 2-6 and Comparative Examples 1-7 with low energy consumption and low Al content is different in that the calcination temperature and time in step S2 are as shown in the table 1, and Comparative Examples 1 to 4 and Comparative Example 6 cancel the S3 step, and the others are substantially the same as in Embodiment 1, and will not be repeated here.

[0056] Preparation conditions and Al content of Table 1 Examples 1-6 and Comparative Examples 1-7

[0057]

[0058]

[0059] Table 2 Comparison of internal resistance of batteries with different Al impurity contents

[0060]

[0061] From Table 1 and Figure 3-4 It can be seen that when the calcination temperature of S2 is higher than 500°C, or the holding time of S2 exceeds 2h, the Al content of the product exceeds 200ppm, and with the increase of temperature, the Al content tends to increase. In ad...

Embodiment 7～9 and comparative example 8

[0064] Compared with Example 1, the recovery method of low energy consumption and low Al content of the lithium iron phosphate positive electrode sheet provided in Examples 7-9 and Comparative Example 8 is different in that the particle size of the first crush and the D50 of the second crush are shown in Table 3 , and others are substantially the same as those in Embodiment 1, and will not be repeated here.

[0065] Table 3 Preparation conditions and Al content of Examples 7-9 and Comparative Example 8

[0066] sample Particle size(mm) Secondary crushed material D50(μm) Al content / ppm Example 7 1～5 50～80 196 Example 8 10～15 50～80 174 Example 9 5～10 80～100 207 Comparative example 8 5～10 30～50 234

[0067] It can be seen from Table 3 that when the particle size of step S1 is between 1-15 mm, if the D50 of S3 exceeds 80 μm or is lower than 50 μm, the Al content of the obtained product will exceed 200 ppm. Only when the particle...

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Abstract

The invention provides a low-energy-consumption and low-Al-content recovery method for a lithium iron phosphate positive plate. The method comprises the following steps of firstly, crushing a to-be-recycled positive plate into coarse particles by using a crusher to obtain a crushed material with the particle size of 1-15mm; heating the primary crushed material to 350-500 DEG C in an inert atmosphere, keeping the temperature for 0.5-2 hours, cooling and discharging to obtain a calcined material; crushing the calcined material into powder by using a crusher to obtain a secondary crushed materialof which the D50 is 50-80 microns; and finally, grading the secondary crushed material by using an airflow grading machine to obtain the positive electrode material of which the Al content is less than 200ppm. Through primary crushing, calcining, secondary crushing and airflow grading, the positive electrode material can be separated and recycled from the aluminum foil; and in the process, low-energy-consumption and low-Al-content recovery of the positive electrode material can be realized by controlling process parameters such as the size of the primary crushed particles, the calcining temperature and time and the particle size of the secondary crushed particles.

Description

technical field [0001] The invention relates to the technical field of recycling lithium-ion waste batteries, in particular to a method for recycling lithium iron phosphate cathode sheets with low energy consumption and low Al content. Background technique [0002] In recent years, lithium-ion batteries have been widely used in automotive power batteries, energy storage power systems, and power tools, electric bicycles, electric motorcycles, military equipment, aerospace, 3C and other fields, and the number is very large. However, as the service life of lithium-ion batteries approaches, a large number of decommissioned and scrapped batteries will be produced. For the recovery of these decommissioned and scrapped lithium-ion batteries, fire or wet processes were mainly used to recover precious metals, such as Li and Co. However, this method not only has a low utilization rate of various materials in lithium-ion batteries, but also causes great pollution to the environment, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/54H01M4/58C01B25/45C01B25/37
CPCH01M10/54H01M4/5825C01B25/45C01B25/375Y02W30/84Y02E60/10H01M2004/028H01M4/1397H01M4/136H01M4/62H01M10/0525
Inventor 曹元成赵玉振肖益帆
Owner HUAZHONG UNIV OF SCI & TECH
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