Method for forming lithium ion secondary battery

A secondary battery and chemical formation method technology, which is applied in the manufacture of secondary batteries, electrochemical generators, and electrolyte batteries, can solve problems such as poor cycle performance, thick lithium-ion secondary batteries, and low battery capacity, and achieve Increased thickness yield, good cycle performance, and high-capacity effects

Inactive Publication Date: 2008-12-24
BYD CO LTD
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the defects of thick battery thickness, low battery capacity and poor cycle performance of the lithium ion secondary battery obtained by the existing chemical conversion method, and provide a battery case with a thinner thickness, high capacity and good cycle performance. Formation method of high-performance lithium-ion secondary battery

Method used

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  • Method for forming lithium ion secondary battery
  • Method for forming lithium ion secondary battery

Examples

Experimental program
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Effect test

Embodiment 1

[0034] This example illustrates the preparation of a lithium ion secondary battery.

[0035] (1) Preparation of positive electrode

[0036] 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.

[0037] The slurry was evenly coated on an aluminum foil, then dried at 150°C, rolled, and cut to obtain a positive electrode with a size of 328×42 mm, which contained 5.5 grams of active ingredient LiCoO 2 .

[0038] (2) Preparation of negative electrode

[0039] 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 electrode slurry.

[0040] The slurry was evenly coated on the copper foil, th...

Embodiment 2

[0044] This embodiment illustrates the formation method of the lithium ion secondary battery provided by the present invention

[0045] prepared as figure 1 The negative pressure charging device.

[0046] The 20 batteries after liquid injection prepared according to the method of Example 1 were respectively loaded in such as figure 1 On the negative pressure charging device shown. The connection method is to penetrate the needle 8 sealed in the rubber block 7 into the liquid injection hole of the battery 9, make the rubber block 7 closely contact with the liquid injection hole and fix the needle 8 in the rubber block 7, and pass The fastening rubber ring 6 fixes the rubber block 7 and the needle 8. The needle 8 is airtightly connected with the syringe 5, and the syringe 5 is connected in series with the vacuum pump 1 through the vacuum pipeline 4, and a vacuum gauge 3 and a vacuum valve 2 are connected in series on the vacuum pipeline 4. The connection between the vacuum p...

Embodiment 3

[0049] This embodiment illustrates the formation method of the lithium ion secondary battery provided by the present invention

[0050] According to the method of Example 2, the battery after liquid injection obtained in Example 1 is formed. The difference is that, under normal pressure, the battery is first charged to 3.4 volts with a constant current of 0.01C, and then the battery is charged at a vacuum degree of At 0.05 MPa, the battery was continuously charged to 4.0 volts at a constant current of 0.01 C, and the subsequent charging steps and conditions were the same as in Example 2. The formed lithium ion battery is obtained.

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Abstract

A method for forming a lithium ion secondary battery comprises the step of charging the lithium ion secondary battery, wherein the process of charging is at least partially carried out under a vacuum condition. The method ensures that the generated gas of the battery can be discharged at any time during the process of charging, so as to completely avoid the problems with the expansion and the deformation of the battery casing caused by the accumulation of the gas generated during the process of charging and with the performance reduction caused by the accumulation of the gas, so that the formed battery has the advantages of high capacity and good cycle performance.

Description

technical field [0001] The invention relates to a method for forming a battery, in particular, the invention relates to a method for forming a lithium ion secondary battery. Background technique [0002] The formation step of lithium-ion rechargeable batteries is an important stage in the manufacture of batteries. The formation is related to the quality of the battery's capacity, cycle life, and safety performance. Formation is the process of charging a battery for the first time. There are mainly two ways of formation of the existing lithium-ion secondary batteries, sealed formation and open formation. The sealing formation is to seal the liquid injection hole after the electrolyte is injected, and then perform the battery formation, and at the same time form the SEI film (Solid Electrolyte Interface) on the surface of the negative electrode through the electrochemical reaction during charging. However, some gases, such as hydrogen fluoride, carbon monoxide, carbon dioxid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/38H01M10/058
CPCY02E60/10Y02P70/50
Inventor 彭高平刘卫平
Owner BYD CO LTD
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