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Method for producing lithium secondary battery and lithium secondary battery produced by the method

A manufacturing method and lithium storage battery technology, which is applied in the manufacture of electrolyte storage batteries, lithium storage batteries, secondary batteries, etc., can solve problems such as complex equipment, deviations between batteries, and affecting battery performance, and achieve economical and easy manufacturing. and the effect of uniform composition and simple equipment

Inactive Publication Date: 2005-02-09
VK MOBILE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since this kind of operation must be carried out in a vacuum state, the equipment is complicated, and the splashing or volatilization of the electrolyte will occur in a vacuum state, so that the amount and composition of the electrolyte will change. Variations occur between cells within the cell and thus affect the performance of the cell

Method used

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  • Method for producing lithium secondary battery and lithium secondary battery produced by the method
  • Method for producing lithium secondary battery and lithium secondary battery produced by the method
  • Method for producing lithium secondary battery and lithium secondary battery produced by the method

Examples

Experimental program
Comparison scheme
Effect test

manufacture example 1

[0026] Production of battery cells for lithium storage batteries

[0027] (1) Preparation of separation membrane membrane

[0028] 9 g of PVDF-HFP copolymer (88:12)-KynarFLEX 2801 (Atochem) and 100 ml of acetone were put into the container, and the temperature was maintained at 45°C while stirring, and the polymer was dissolved in the solvent. Among them, 10 g of dibutyl phthalate as a plasticizer and 1 g of fumed silica were added, and stirring was continued for 30-60 minutes while maintaining the above temperature to obtain a uniformly dispersed solution. The mixture is coated on the surface-treated PET film with a coater, and dried in a drying zone. The film thickness at this time reached 45 microns.

[0029] (2) Preparation of cathode film

[0030]10 g of PVDF-HFP copolymer (88:12)-KynarFLEX 2801 (Atochem) and 100 ml of acetone were put into the container, and the temperature was maintained at 45°C while stirring, and the polymer was dissolved in the solvent. Among them, 16 g...

Embodiment 1

[0046] Production of lithium storage battery of the present invention

[0047] The battery cell manufactured by the manufacturing example 1 was prepared. Put the battery cell in an aluminum laminate box and store it in dry CO with a dew point temperature of -40°C or less 2 An electrolyte was injected into the aluminum laminate box under an atmosphere. After that, dry CO with a dew point temperature of -40°C or less 2 Heat up to 180℃ and 2kgf / cm are applied to the battery in the atmosphere 2 Pressure, and was sealed. After sealing, the battery was charged and discharged three times at a voltage of 3.0-4.2V, and thus a lithium secondary battery was manufactured.

experiment example 1

[0054] Measurement of discharge capacity and appearance

[0055] (1) Measuring method of discharge capacity at -10℃

[0056] The batteries manufactured in the Examples and Comparative Examples were charged to 4.2V with a current of 0.5C at normal temperature, and after being left at -10°C for 4 hours, they were discharged at 0.5C, and their capacity was measured. The results are shown in Table 1.

[0057] -10℃ discharge capacity

Example 1

80.7％

Comparative example 1

74.0％

[0058] As shown in Table 1 above, the lithium secondary battery manufactured according to the manufacturing method of the present invention exhibits excellent low-temperature performance. Specifically, the low-temperature discharge capacity of Comparative Example 1 was 74.0%, and Example 1 showed a low-temperature discharge capacity of 80.7%. It can be seen that the lithium battery manufactured by the manufacturing method of the present invention increased the low-temp...

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Abstract

A process for manufacturing lithium storage battery comprises a step of preparation of power cells for the battery pack; a step of loading said battery pack power cells into a battery packing box; a step of injecting an electrolytic solution into said battery packing box under CO2 atmosphere; a step of sealing said battery packing box under CO2 atmosphere; and a step of charging and discharging said final product. Compared to the prior process wherein the sealing is executed at vacuum state, the present invention adopts simple equipments, prevents phenomena such as splashing and volatilization of the electrolytic solution, and is capable of fabricating lithium storage batteries by using an electrolytic solution with homogeneous amount and constitution. In addition, the gas inside power cells will be not obviously reduced after the power cells are charged / discharged, then in the cases not suitable for vacuum seal, the exterior deformation of power cells can be prevented, the identical effects can be obtained by executing continuously the air suction step, and then lithium storage batteries can be fabricated by using a simple process. In accordance with the present invention, lithium storage batteries with excellent low temperature performances can be fabricated. The present invention also provides lithium storage batteries manufactured through said process.

Description

Technical field [0001] The present invention relates to a method for manufacturing a lithium secondary battery and a lithium secondary battery, in particular to a method for manufacturing a lithium secondary battery including a step of sealing with a battery packaging box and a lithium secondary battery manufactured by the manufacturing method. Background technique [0002] Recently, as the miniaturization and weight reduction of electronic devices have become possible due to the development of the cutting-edge electronics industry, the use of portable electronic instruments is increasing. The demand for batteries with high energy density as the power source of such portable electronic devices is also increasing, which makes research on lithium batteries very active. [0003] Lithium storage batteries are composed of anode / cathode active materials, current collectors and electrolytes. The anode / cathode active materials function to generate a potential difference through the proce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/04H01M10/058H01M50/124H01M50/609
CPCY02E60/122H01M2/0287B32B27/08H01M10/052H01M10/058H01M2/0275Y02E60/10H01M50/124Y02P70/50H01M50/609H01M10/049H01M10/446H01M50/60H01M50/129
Inventor 洪性珉尹硕晙金芝秀
Owner VK MOBILE
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