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Formation method of lithium ion battery

A lithium-ion battery and formation method technology, which is applied in the field of formation of lithium-ion batteries, can solve problems such as cycle performance that cannot meet customer requirements, and achieve the effects of eliminating or reducing polarization, eliminating concentration polarization, and improving cycle performance

Inactive Publication Date: 2020-04-28
江苏智泰新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods have made some achievements in improving the cycle performance of lithium ions. However, with the continuous improvement of the durability requirements of electrical equipment and the increasing requirements of customers for the cycle performance of batteries, the existing lithium-ion batteries The cycle performance of lithium-ion batteries can no longer meet customer requirements, and the cycle performance of lithium-ion batteries still needs to be improved

Method used

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  • Formation method of lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Place a batch of batteries after liquid injection on the formation cabinet, and charge them with a constant current of 0.2C at 25°C until the voltage at both ends of the batteries is 3.0V. Continue to charge the above batteries with constant current pulses, first Charge the battery with a current of 0.2C for 1s, stop charging, and leave it for 30s, and cycle like this until the voltage at both ends of the battery is 3.85V, stop charging, and end the entire charging process. This batch of batteries was marked as batch A when they were transferred.

Embodiment 2

[0035] Place a batch of batteries after liquid injection on the formation cabinet, and charge them with a constant current of 0.2C at 25°C until the voltage at both ends of the batteries is 3.0V. Continue to charge the above batteries with constant current pulses, first Charge the battery with a current of 0.2C for 0.9s, stop charging, put it on hold for 30s, then charge it with a reverse constant current at 0.01C for 0.1s, then stop charging, put it on hold for 30s, and cycle until the voltage at both ends of the battery is 3.85V and stop charging , to end the entire charging process. This batch of batteries was marked as batch B when they were transferred.

Embodiment 3

[0037] Place a batch of batteries after liquid injection on the formation cabinet, and charge them with a constant current of 0.2C at 25°C until the voltage at both ends of the batteries is 3.0V. Continue to charge the above batteries with constant current pulses, first Charge the battery with a current of 0.2C for 5s, stop charging, put it on hold for 30s, then reverse charge it with a constant current of 0.01C for 0.5s, then stop charging, put it on hold for 30s, and cycle like this until the voltage at both ends of the battery is 3.85V and stop charging. End the whole charging process. This batch of batteries was marked as batch C at the time of circulation.

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Abstract

The invention relates to a formation method of a lithium ion battery. The method comprises the steps of sequentially carrying out constant-current charging and pulse formation on a battery, wherein the constant-current charging method comprises the step of carrying out constant-current charging on the battery to 2.75-3.5V, the pulse formation method comprises the steps of carrying out constant-current charging on the battery, stopping charging, then carrying out reverse constant-current charging, stopping charging, and repeating the steps until the charging capacity accounts for 50%-100% of the designed capacity or the voltage reaches 2.8-4.2V. Compared with an existing formation mode, pulse formation is alternately carried out in a short-time, low-current charging and reverse charging mode, the polarization is rapidly eliminated or reduced, and concentration polarization caused by charging is greatly eliminated; and meanwhile, a more stable and compact SEI film is formed on the surface of the negative electrode of the lithium ion battery, so that the cycle performance is greatly improved.

Description

technical field [0001] The invention relates to the technical field of production of lithium-ion batteries, in particular to a method for forming lithium-ion batteries. Background technique [0002] At present, global resources are scarce and pollution is serious, and the development of clean energy is imminent. It is my country's policy to establish a clean, safe, high-quality, and economical energy system, reduce the dependence of fuel-consuming vehicles on non-renewable petroleum resources, and achieve sustainable development. Lithium-ion batteries have been widely concerned as a substitute for petroleum resources. In recent years, the development of lithium ions in my country has mainly focused on two aspects: one is used as a power source and energy storage equipment for vehicles, ships, aircraft and other means of transportation; the other is used in electronic equipment such as mobile phones and computers. [0003] With the increasing living standards, the requireme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058H01M10/0525
CPCH01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 韩伟李亚辉龙海涛吴丽君
Owner 江苏智泰新能源科技有限公司
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