Recovery method of positive active material in lithium ion battery waste material

A positive electrode active material and lithium-ion battery technology, applied in the field of lithium-ion batteries, can solve the problems of unsatisfactory capacity and low charge-discharge efficiency of lithium-ion secondary batteries

Inactive Publication Date: 2014-05-14
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to overcome the defects that the positive electrode active material obtained in the recycling method of the prior art makes the capacity of the lithium-ion secondary battery unsatisfactory and the charging and discharging effici

Method used

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  • Recovery method of positive active material in lithium ion battery waste material
  • Recovery method of positive active material in lithium ion battery waste material
  • Recovery method of positive active material in lithium ion battery waste material

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0029] Example 1

[0030] Take 200g of waste lithium iron phosphate positive electrode sheet, put it into the tray, put it into the high temperature resistance furnace under Ar atmosphere, heat treatment at 450℃ for 2h, then cool it with the furnace, and sieve to obtain the separated active powder Then put the separated active powder material into the tray, put it into the high-temperature resistance furnace under the protection of Ar atmosphere, sinter at the furnace temperature of 725℃ for 4h, and then cool with the furnace at a rate of 2.0℃ / min, the lithium iron phosphate positive electrode active material sample S1 is obtained after air jet pulverization.

[0031] The sample S1 was tested with a Rigaku D / MAX2200PC X-ray diffractometer, and the diffraction pattern obtained was as follows image 3 As shown in the figure, it can be seen that the diffraction peak is sharp, the peak intensity is 13750CPS, and the half-value width is 0.234 o , Which shows that the crystal is very co...

Example Embodiment

[0032] Example 2

[0033] Take 200g of dried waste lithium iron phosphate positive slurry, put it into the tray, and put N 2 In a high-temperature resistance furnace in a gas atmosphere, heat treatment at a furnace temperature of 400℃ for 6h, then cool down with the furnace, and then put it in N 2 In a high-temperature resistance furnace protected by a gas atmosphere, the furnace was sintered at a high temperature of 700°C for 2h, and then cooled with the furnace at a temperature drop rate of 5°C / min. After ball milling, the anode active material sample S2 of lithium iron phosphate was obtained.

[0034] The obtained sample S2 was tested with the same X-ray diffractometer and scanning electron microscope as used in Example 1, and the obtained XRD diffractogram and image 3 Basically similar, the obtained scanning electron microscope image is similar to that figure 1 Basically similar. The diffraction peaks of the tested XRD diffraction patterns are all lithium iron phosphate diffrac...

Example Embodiment

[0035] Example 3

[0036] Take 200g of waste lithium iron phosphate positive electrode sheet, put it into the tray, and put H 2 And N 2 Mixed gas (by volume ratio H 2 / N 2 =5:95) In a high-temperature resistance furnace under an atmosphere, heat treatment for 4h at a furnace temperature of 425℃, then cool with the furnace and sieve to obtain the separated active powder material, and then load the separated active powder material into the tray , Then put it in a high temperature resistance furnace under the protection of Ar gas atmosphere, sinter at a high temperature of 750℃ for 6h, and then cool with the furnace at a cooling rate of 0.5℃ / min. After airflow pulverization, a sample of lithium iron phosphate cathode active material is obtained S3.

[0037] The obtained sample S3 was tested with the same X-ray diffractometer and scanning electron microscope as used in Example 1, and the obtained XRD diffraction pattern and image 3 Basically similar, the obtained scanning electron mic...

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Abstract

The invention provides a recovery method of a positive active material in a lithium ion battery waste material. The method includes the following steps: S1, heat treatment of the waste material is performed at 350-500DEG C in inert gas or reducing gas atmosphere; S2, powder product obtained in the step S1 is sintered at 600-800DEG C in the inert gas or reducing gas atmosphere; and the positive active material is obtained by recovery; the positive active material is one or multiple substance selected from lithium phosphate, lithium silicate or a vanadium material of lithium. The positive active material obtained by recovery is high in charge and discharge capacity, and high in charge and discharge efficiency, the obtained positive active material is even in particle size distribution, and complete in crystal structure, the technical process of the recovery method is simple, the requirement on equipment is low, the process is easy to control, at the same time, the recovery process may not cause a negative impact on the active material, physical and chemical properties and electrochemical activity of the active material may not be affected, the recovery and reuse of the positive active material raw material can be realized, the cost can be saved, and the recovery method has environmental-friendly benefits.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a method for recovering positive electrode active materials in waste materials of lithium ion batteries. Background technique [0002] Lithium-ion batteries are currently widely used secondary batteries, which have the advantages of high specific energy, high working voltage, low self-discharge rate, long cycle life, and no pollution. Widely used in electric tools, electric vehicles and other fields, due to its wide application fields, the battery consumption is huge, and a large number of scrapped batteries will be generated every year, resulting in a large amount of positive electrode waste. The waste slurry and waste electrode sheets in the battery production process will also produce a large amount of positive electrode waste. Therefore, in order to protect the environment, recycle and reuse materials, and save costs, it is very necessary to recycle...

Claims

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Application Information

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IPC IPC(8): H01M10/54
CPCY02W30/84H01M10/54
Inventor 徐茶清肖峰
Owner BYD CO LTD
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