Method for directly repairing and regenerating positive electrode material of waste lithium iron phosphate battery

A lithium iron phosphate battery, repair and regeneration technology, applied in battery electrodes, secondary batteries, battery recycling and other directions, can solve the problems of high energy consumption, use of positive electrode materials, etc., to reduce pollution and energy consumption, improve recycling efficiency, The effect of high economic driving force

Active Publication Date: 2020-06-02
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method still requires high energy consumption, and the recovered material needs secondary treatment, so it cannot be directly used as anode material

Method used

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  • Method for directly repairing and regenerating positive electrode material of waste lithium iron phosphate battery
  • Method for directly repairing and regenerating positive electrode material of waste lithium iron phosphate battery
  • Method for directly repairing and regenerating positive electrode material of waste lithium iron phosphate battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Dismantling of waste lithium-ion batteries and recycling of cathode materials

[0033] After the waste lithium-ion battery is dismantled step by step, the positive electrode, negative electrode, and diaphragm are separated; 1g of the positive electrode piece is separated, and the recovered positive electrode material is obtained after washing with 20mL of dimethyl carbonate;

[0034] (2) Use ICP-MS to test the lack of lithium ions in the waste electrode sheet, use an analytical balance to weigh the loading capacity and surface capacity per unit area of ​​the electrode sheet; then weigh the quality of the positive electrode material obtained, and calculate the loading capacity per unit area and Positive electrode theoretical capacity per unit area; use an analytical balance to weigh the loading capacity and surface capacity per unit area of ​​the electrode sheet.

[0035] (3) Preparation of pre-lithiated graphite negative electrode

[0036] Mix graphite powder, conduc...

Embodiment 2

[0042] Other steps are identical with embodiment 1, and difference is that the step of preparing pre-lithiated graphite negative electrode in step (3) is as follows:

[0043] 3-a) Put metal lithium powder into a sealed tank filled with an inert atmosphere, heat it to 180-200°C to make metal lithium into molten lithium, and use sputtering equipment to cool rapidly to obtain uncoated metal Lithium powder;

[0044] 3-b) Will (NH 4 ) 2 HPO 4 , Li 2 C 2 o 4 , Al(NO 3 ).9H 2 Add O into the propanol solvent and stir at room temperature. After the drug is completely dissolved, add tetrabutyl titanate and continue stirring to obtain a sol. The spherical lithium aluminum titanium phosphate (LATP) precursor is obtained by spray drying. , and then calcined at 900 °C for 1 h in an air atmosphere to obtain spherical LATP powder; polyacrylonitrile (PAN) and LiClO 4 Add it into dimethylformamide (DMF), add LATP powder after it is completely dissolved, and stir at 80°C for 6 hours to ...

Embodiment 3

[0048] Other steps are identical with embodiment 1, and difference is that the step of preparing pre-lithiated graphite negative electrode in step (3) is as follows:

[0049] In a dry environment, use a roller press to press the lithium foil to a thickness of 3-5 μm, then gently press the pressed lithium foil on the graphite negative electrode sheet, and the preparation of the pre-lithiated graphite negative electrode is completed. The deficient amount of lithium in the waste lithium iron phosphate positive electrode is in excess of 5wt%.

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Abstract

The invention provides a method for directly repairing and regenerating a positive electrode material of a waste lithium iron phosphate battery. The method comprises the following steps: 1) performingdisassembling; 2) calculating the capacity; 3) carrying out pre-lithiation operation of the negative plate; 4) assembling the whole battery, and performing discharge treatment under a low current tocomplete lithium supplement to obtain the lithium battery. According to the method, after the recycled waste lithium iron phosphate positive electrode material is obtained through a simple method, thesecondary treatment is not needed, the recycled waste lithium iron phosphate positive electrode material and the pre-lithiated negative electrode are directly assembled into the battery; the discharging is conducted at low current, and performance repairing of the waste lithium iron phosphate positive electrode is completed. The direct regeneration method disclosed by the invention is capable ofrealizing continuous production, free of secondary pollution, simple and convenient, low in cost and beneficial to industrial production.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a method for recycling and regenerating waste lithium iron phosphate battery positive electrode materials, and a lithium ion battery obtained by obtaining positive electrode materials based on the method. Background technique [0002] In today's energy shortage and environmental pollution, lithium-ion batteries play an irreplaceable role as a clean energy source. It is widely used in consumer electronics and new energy vehicles. Among them, the batteries of new energy vehicles generally use NCM ternary batteries and lithium iron phosphate batteries. Under normal circumstances, the working life of NCM ternary batteries and lithium iron phosphate batteries is 5-10 years, and they will inevitably be decommissioned or scrapped after reaching the service life. Since 2014, new energy vehicles have gradually become popular, so around 2018 ushered in the first wave of bat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/54H01M10/42H01M10/058H01M10/0525H01M4/58
CPCH01M4/5825H01M10/0525H01M10/058H01M10/4242H01M10/54Y02E60/10Y02W30/84Y02P70/50
Inventor 郭玉国王涛孟庆海殷雅侠
Owner INST OF CHEM CHINESE ACAD OF SCI
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