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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 efficiency is low, and provides a method that can obtain a lithium-ion secondary battery with a high capacity, A simple and easy-to-implement method for recycling positive electrode active materials from lithium-ion battery waste with high charge-discharge efficiency

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

Embodiment 1

[0030] Take 200g of waste lithium iron phosphate positive electrode, put it into a material tray, put it into a high-temperature resistance furnace under an Ar gas atmosphere, heat-treat it at a furnace temperature of 450°C for 2 hours, then cool with the furnace, and sieve to obtain the detached active powder material, and then put the detached active powder material into the material tray, put it into a high-temperature resistance furnace under the protection of Ar gas atmosphere, and sinter at a high temperature of 725 °C for 4 hours, and then cool with the furnace at a cooling rate of 2.0 °C / min, the lithium iron phosphate cathode active material sample S1 was obtained after jet milling.

[0031] The sample S1 was tested by an X-ray diffractometer of the Rigaku D / MAX2200PC type in Japan, and the obtained diffraction pattern was as follows image 3 As shown, it can be seen from the figure that the diffraction peak is sharp, its peak intensity is 13750CPS, and its half-peak...

Embodiment 2

[0033] Get 200g of dried waste lithium iron phosphate positive slurry, put it into a tray, put it into N 2 In the high-temperature resistance furnace under the gas atmosphere, heat treatment at the furnace temperature of 400 ° C for 6 hours, then cool with the furnace, and then put it in the N 2 In a high-temperature resistance furnace under the protection of an air atmosphere, sinter at a furnace temperature of 700°C for 2 hours, then cool with the furnace at a cooling rate of 5°C / min, and ball mill to obtain a lithium iron phosphate cathode active material sample S2.

[0034] The obtained sample S2 is tested using the same X-ray diffractometer and scanning electron microscope used in Example 1 respectively, and the obtained XRD diffraction pattern is the same as image 3 Basically similar, the obtained scanning electron microscope picture is as figure 1 Basically similar. The diffraction peaks of the tested XRD diffraction pattern are all lithium iron phosphate diffraction...

Embodiment 3

[0036] Take 200g waste lithium iron phosphate positive electrode, put it into the material tray, put it into H 2 and N 2 Mixed gas (by volume ratio H 2 / N 2 =5:95) in the high-temperature resistance furnace under the atmosphere, heat treatment at the furnace temperature of 425°C for 4 hours, then cool with the furnace, sieve the detached active powder material, and then put the detached active powder material into the tray , and then placed in a high-temperature resistance furnace under the protection of Ar gas atmosphere, sintered at a furnace temperature of 750°C for 6 hours, and then cooled with the furnace at a cooling rate of 0.5°C / min. S3.

[0037] The obtained sample S3 is tested using the same X-ray diffractometer and scanning electron microscope used in Example 1 respectively, and the obtained XRD diffraction pattern is the same as image 3 Basically similar, the obtained scanning electron microscope picture is as figure 1 Basically similar. The diffraction peak...

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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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