A kind of formation method and lithium ion secondary battery

A technology of lithium ion battery and formation method, which is applied in the field of formation method and lithium ion secondary battery, can solve the problems of poor appearance of lithium ion battery, low capacity of lithium ion battery, bulge of lithium ion battery, etc., to improve the formation quality and reduce the Production cost, the effect of improving comprehensive electrochemical performance

Active Publication Date: 2019-08-02
JIANGSU YITE NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, in the industrial production process of lithium-ion batteries, quality problems such as lithium-ion battery swelling, low capacity, and short service life are prone to occur.
This is due to the electrochemical reduction reaction of trace water, hydrogen fluoride and organic solvents in the lithium-ion battery during the formation and charging process to generate gas. and other quality problems

Method used

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  • A kind of formation method and lithium ion secondary battery
  • A kind of formation method and lithium ion secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] This embodiment provides a chemical formation method, including a first chemical formation stage, a second chemical formation stage, a third chemical formation stage, and a fourth chemical formation stage, which are performed sequentially.

[0026] The first formation stage is to charge the lithium-ion battery to a 2% state of charge at a constant current of 0.01C at a temperature of 15°C, and perform the first charge under the conditions of a 2% state of charge and a vacuum of -0.005MPa. Pumping for 0.5h.

[0027] The second formation stage is to charge the lithium-ion battery to a 30% state of charge at a constant current of 0.03C at a temperature of 30°C, and conduct the second charge at a state of charge of 30% and a vacuum of -0.01MPa. Pumping for 1h.

[0028] The third formation stage is to charge the lithium-ion battery to a 75% state of charge at a constant current of 0.06C at a temperature of 60°C, and perform the third charge under the conditions of a state o...

Embodiment 2

[0032] The difference between a kind of formation method provided in this embodiment and the formation method provided in Example 1 is:

[0033] In the fourth formation stage, after the lithium-ion battery is charged to full charge with a constant current, the lithium-ion battery is also stored at the temperature of the fourth formation stage for 24 hours before the fourth pumping.

[0034] For simplicity, please refer to the corresponding content in Embodiment 2 for the parts not mentioned in this embodiment.

Embodiment 3

[0036] The difference between a kind of formation method provided in this embodiment and the formation method provided in Example 2 is:

[0037] In the fourth formation stage, after the lithium-ion battery is charged to full charge with a constant current, the lithium-ion battery is also stored at the temperature of the fourth formation stage for 48 hours before the fourth pumping.

[0038] For simplicity, please refer to the corresponding content in Embodiment 2 for the parts not mentioned in this embodiment.

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Abstract

The invention provides a formation method and a lithium-ion secondary battery, and relates to the technical field of lithium-ion batteries. The invention provides a formation method. The lithium-ion battery is formed through four formation stages which are sequentially carried out. The formation current of the four formation stages is gradually increased, and negative pressure extracted for four times is also linearly increased. According to the formation method, the formation quality of an SEI film can be effectively improved and the bulging rate of the lithium-ion battery is reduced, so that the comprehensive electrochemical properties of the lithium-ion battery are improved. According to the lithium-ion secondary battery, an electrolyte of the lithium-ion secondary battery is a non-aqueous system and formation treatment is carried out by using the formation method. The lithium-ion secondary battery does not easily bulge in the using process and has good comprehensive electrochemical properties.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular, to a formation method and a lithium ion secondary battery. Background technique [0002] As a new type of power supply, lithium-ion battery has the characteristics of long cycle life, high energy density, high working voltage, no memory effect and environmental protection. It has been widely used in many fields, such as electronic products, electric vehicles, communication power supply and other fields. It has broad application prospects, and the market demand for lithium-ion batteries is also increasing day by day. [0003] At present, in the production process of lithium-ion batteries, formation is an important process in the production process of lithium-ion batteries. During formation, a passivation film is formed on the surface of the negative electrode, which is the solid electrolyte film (SEI). The quality of the SEI film directly affects the quality of lithiu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/44H01M10/0525
CPCH01M10/0525H01M10/446Y02E60/10
Inventor 熊永莲陈玉炜侯全会严军
Owner JIANGSU YITE NEW MATERIAL CO LTD
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