Recycling method of power lithium-ion batteries

A lithium-ion battery and power technology, which is applied in the field of lithium battery recycling and new energy, and can solve the problems of improper recycling method and harmful exhaust gas.

Inactive Publication Date: 2017-02-22
MEIZHOU LIANGNENG NEW ENERGY SCI & TECHCO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the problem of improper recycling of lithium-ion batteries in the prior art, resulting in a large amount of harmful waste gas and waste liquid, the present invention provides a method for recycling power lithium-ion batteries, which includes the following steps:

Method used

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  • Recycling method of power lithium-ion batteries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] With the battery in the comparative example (1C discharge capacity is the battery of 650mAh), discharge to 3.0V with 650mA electric current first, under the environment that relative humidity is lower than 2%, the liquid injection port of battery is opened, injects 0.98g lithium hexafluorophosphate electrolyte ( 1.5g per ampere hour), the injection of the electrolyte is carried out twice, each injection of 0.49g of electrolyte, each time after the electrolyte is injected, it needs to be vacuumed, and each vacuum is completed through the following three steps in sequence: -30KPa vacuuming for 60s; -60KPa vacuuming for 60s; -90KPa vacuuming for 60s;

[0034] After the electrolyte is completely infiltrated, charge and form with a predetermined current of 0.05~0.2C. The charge and form are completed in the following three steps: charge with a current of 0.05 for 120 minutes and rest for 5 minutes; then charge with 0.1C for 240 minutes and rest for 5 minutes; C charge for 60...

Embodiment 2

[0037] The amount of electrolyte added in Example 1 was changed from 0.98g to 1.56g (2.4g per ampere hour), and the other production methods were the same as in Example 1, and then tested. The results are shown in the following test instructions.

Embodiment 3

[0039] The amount of electrolyte added in Example 1 was changed from 0.98g to 1.95g (3.0g per ampere hour), and the other production methods were the same as in Example 1, and then the test was carried out. The results are shown in the following test description.

[0040] test introduction:

[0041] 1. Capacity test

[0042]Test method: at 25°C, fully charge to 4.2V with 650mA current, leave it for 5 minutes, and then discharge to 3.0V with 650mA current.

[0043] For each group of embodiments, all removed batteries with a 1C discharge capacity of 650mA are used to make batteries according to the implementation methods of each group. After the battery is manufactured, the capacity is tested according to the above test method, and the results show that:

[0044] In the comparative example, the battery 1C discharge capacity is 650mAh, the battery 1C discharge capacity of Example 1 is 716mAh, the implementation 2 battery 1C discharge capacity is 743mAh, and the implementation 3...

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Abstract

The invention relates to a recycling method of power lithium-ion batteries. The method comprises the following steps of (S1) firstly discharging the recycled power lithium-ion batteries to corresponding minimum standard voltage according to the batteries of different material systems; (S2) opening battery injection openings and injecting a lithium hexafluorophosphate electrolyte; (S3) after the electrolyte completely infiltrates, carrying out charging formation by using predetermined current; and (S4) finally sealing the openings and dividing the capacity. According to the manufactured lithium-ion batteries, through a test at a room temperature of 25 DEG C, the initial capacity is improved by over 10% in comparison with the capacity of each battery before being recycled; the capacity retention ratio after 300 IC current charge and discharge cycles is greater than 85% of the initial capacity; normal use in the industries, with low power performance requirements, of an energy storage power supply, daily digital and household appliances, lamps and the like can be met; and stepwise reuse of the lithium-ion batteries eliminated from the power industries of electric vehicles, electric bicycles, model airplanes, electric tools and the like is achieved.

Description

technical field [0001] The invention relates to the field of lithium battery recycling and manufacturing and new energy, in particular to a method for recycling a power lithium ion battery. Background technique [0002] With the continuous development of social economy, energy and environmental protection have become two major problems faced by all mankind. In recent years, the state has issued a series of incentive policies for the application of new energy vehicles. Domestic power lithium-ion batteries, especially power vehicles Batteries have seen rapid development. [0003] However, with the widespread application of power lithium-ion batteries, new environmental protection issues will arise. Normal power lithium-ion batteries can be used in cars for 3 to 5 years. These large power lithium batteries cannot continue After use, it needs to be recycled. At present, the conventional recycling method is to disassemble the battery, separate the positive and negative electrod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/54H01M10/0525
CPCH01M10/0525H01M10/54Y02E60/10Y02W30/84
Inventor 赵培成王守军刘新华刘明东
Owner MEIZHOU LIANGNENG NEW ENERGY SCI & TECHCO
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