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Formation method for lithium ion secondary battery

A technology of secondary battery and chemical formation method, which is applied in secondary battery, secondary battery repair/maintenance, secondary battery charging/discharging, etc. It can solve the problems of poor battery cycle performance, improve cycle performance, and reduce battery gas. Expansion problem, the effect of improving the capacity maintenance rate

Inactive Publication Date: 2008-04-02
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a lithium-ion secondary battery formation method that can make the battery have good cycle performance in order to overcome the disadvantages of the poor cycle performance of the battery produced by the existing formation method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] This embodiment illustrates the formation method of the lithium ion secondary battery provided by the present invention.

[0018] 1. Preparation of battery

[0019] (1) Preparation of positive electrode

[0020] 100 g of the positive active ingredient LiCoO 2 , 2 grams of binder polyvinylidene fluoride (PVDF), 3 grams of conductive agent acetylene black were added and mixed with 40 grams of N-methylpyrrolidone, and then stirred in a vacuum mixer to form a uniform positive electrode slurry.

[0021] The slurry was evenly coated on aluminum foil, then dried at 150°C, rolled, and cut to obtain a positive electrode with a size of 540×43.5 mm, which contained 5.8 grams of active ingredient LiCoO 2 .

[0022] (2) Preparation of negative electrode

[0023] Mix 100 grams of natural graphite, a negative electrode active ingredient, 1 gram of binder polyvinylidene fluoride (PVDF), and 40 grams of N-methylpyrrolidone, and then stir in a vacuum mixer to form a uniform negative ...

Embodiment 2

[0033] This embodiment illustrates the formation method of the lithium ion secondary battery provided by the present invention.

[0034] Lithium-ion secondary batteries are prepared according to the method of Example 1 and the battery is formed and aged. The difference is that the electric current in the step (1) is 0.02C during the formation of the battery, and the constant current in the step (2) is In the process of current pulse charging, first charge the battery with a current of 0.1C for 40 seconds, then stop charging, rest for 45 seconds, then charge with a current of 0.1C for 40 seconds, and rest for 45 seconds, and so on until the voltage across the battery is 3.72 volts , then charge with a constant current of 0.06C for 30 seconds, stop charging, put it aside for 35 seconds, charge with a current of 0.06C for 30 seconds, put it aside for 35 seconds, and cycle like this until the voltage at both ends of the battery reaches 3.8 volts, then charge with 0.05 C constant c...

Embodiment 3

[0036] This embodiment illustrates the formation method of the lithium ion secondary battery provided by the present invention.

[0037] Lithium-ion secondary battery was prepared according to the method of Example 1 and the battery was formed and aged. The difference was that the electric current in step (1) in the formation process of the battery was 0.2C until the voltage across the battery was 3.5 volts. . In the constant current pulse charging in step (2), first charge the battery with a current of 0.2C for 30 seconds, then stop charging, leave it for 40 seconds, charge it with a current of 0.2C for 30 seconds, and leave it for 40 seconds, such as the second cycle When the voltage at both ends of the battery is 3.72 volts, charge it with a current of 0.08C for 30 seconds, then stop charging, put it aside for 35 seconds, charge it with a current of 0.08C for 30 seconds, put it aside for 35 seconds, and cycle like this until the voltage at both ends of the battery is 3.8 v...

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PUM

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Abstract

The invention relates to a chemical composite method of lithium ion secondary battery, which includes that: a battery is charged under the chemical composite temperature of lithium ion secondary battery; the charging process includes a constant current charging and a pulse charging to the battery; the pulse charging method includes that the battery is charged up in pulse charging process by a constant current; the constant current pulse charging is that the constant current charging is the first and then stop charging, and then constant current charging again, and then stop charging, thus the process can be cycled until the voltage reaches to 3.5 to 4.25 Volts; the constant current pulse charging current is 0.01 to 2C. The capacity of the lithium ion secondary battery fabricated by the battery chemical composite method has a high duration rate, and the battery has a favorable cycling performance.

Description

technical field [0001] The present invention relates to a battery formation method, more specifically, to a lithium ion secondary battery formation method. Background technique [0002] Before the battery is used, it must be chemically formed in order to activate the active materials of the positive and negative electrodes of the battery, so that the battery can reach the best state of charge and discharge. The formation of the battery generally refers to charging the battery for the first time. The formation is generally an open formation, and the formation method is to charge the battery continuously with a constant current or a constant current and a constant voltage at room temperature. Such as CN1412880A discloses a kind of secondary lithium-ion battery opening positive pressure formation method, the formation method comprises the battery that has been injected into the electrolyte and aged, the liquid injection hole is sealed with adhesive tape, put on the charging and...

Claims

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Application Information

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IPC IPC(8): H01M10/38H01M10/40H01M10/44
CPCY02E60/122Y02E60/10Y02P70/50
Inventor 黄玉元张才毓
Owner BYD CO LTD
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