Formation method and lithium-ion secondary battery

A lithium ion battery and a technology for a formation method, which are applied in the fields of formation methods and lithium ion secondary batteries, can solve the problems of low capacity of lithium ion batteries, poor appearance of lithium ion batteries, bulging of lithium ion batteries, etc., so as to improve the formation quality and reduce the Production cost, effect of improving overall electrochemical performance

Active Publication Date: 2017-05-31
深圳一特科技有限公司
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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

Method used

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  • Formation method and lithium-ion secondary battery
  • Formation method and lithium-ion secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0024] Example 1

[0025] This embodiment provides a chemical conversion method, including a first chemical conversion stage, a second chemical conversion stage, a third chemical conversion stage, and a fourth chemical conversion stage in sequence.

[0026] The first chemical conversion 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 time under the conditions of a 2% state of charge and a vacuum of -0.005MPa Pump 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 perform the second time under the conditions of a 30% state of charge and a vacuum of -0.01MPa Pump for 1h.

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

Example Embodiment

[0031] Example 2

[0032] The difference between the formation method provided in this embodiment and the formation method provided in Embodiment 1 is:

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

[0034] To simplify the presentation, please refer to the corresponding content in the second embodiment for the parts not mentioned in this embodiment.

Example Embodiment

[0035] Example 3

[0036] The difference between the formation method provided in this embodiment and the formation method provided in Embodiment 2 is:

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

[0038] To simplify the presentation, please refer to the corresponding content in the second embodiment 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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IPC IPC(8): H01M10/44H01M10/0525
CPCH01M10/0525H01M10/446Y02E60/10
Inventor 熊永莲陈玉炜侯全会严军
Owner 深圳一特科技有限公司
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