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Fabrication of lithium secondary battery

A technology for lithium secondary batteries and battery casings, applied in secondary batteries, secondary battery gas removal, lithium storage batteries, etc., can solve problems such as unfavorable expansion, achieve the effect of improving high-temperature life and eliminating expansion phenomena

Inactive Publication Date: 2009-12-16
SK ENERGY CO LTD (KR)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, since the reducibility of the above-mentioned anode SEI improvers is lower than that of conventional additives such as VC (vinylene carbonate) or VEC (ethylene carbonate), the reduction can only be performed when the voltage of the anode is further lowered.
Therefore, when pre-charging to an SOC of 10% or less and then degassing with a conventional degassing process, the additives are not 100% reduced, thus additionally generating gas during the subsequent molding process, which unfavorably causes swelling question

Method used

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  • Fabrication of lithium secondary battery
  • Fabrication of lithium secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] As the positive electrode active material and the positive electrode conductive material, spinel-type LiMn 2 o 4 and acetylene carbon black, and graphite is used as the negative electrode active material. Use by adding 1M LiPF 6 An electrolytic solution obtained by dissolving the salt in an organic solvent mixture of EC (ethylene carbonate): EMC (ethylene carbonate) at a ratio of 3:7. PVDF (polyvinylidene fluoride) was used as the positive electrode binder, and an SBR / CMC (styrene-butadiene rubber / carboxymethyl cellulose) system was used as the negative electrode binder. The battery pouch was formed of aluminum, and its thickness was 120 μm. The separator is a polyethylene separator.

[0036] To prepare the positive plate, the positive active material, the conductive material and the binder were added to the binder solution (NMP (N-methylpyrrolidone) solvent containing 10% by weight binder) at a weight ratio of 94:3:3 , and then mixed together to prepare an electro...

Embodiment 2

[0041] A lithium secondary battery was prepared in the same manner as in Example 1, except that it was precharged to 70% of the battery capacity. The thickness variation of the fabricated cells before and after the molding process was measured. Its thickness increases as figure 1 shown.

Embodiment 3

[0043] A lithium secondary battery was prepared in the same manner as in Example 1, except that it was precharged to 100% of the battery capacity, and the process of fully charging was omitted during the molding process. The thickness variation of the fabricated cells before and after the molding process was measured. The increase in its thickness is as figure 1 shown.

[0044] In addition, the battery was placed at a high temperature of 55° C., and the ASI was measured every 2 weeks to observe the change of ASI with time. The result is as figure 2 shown.

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Abstract

This invention relates to a method of fabricating a lithium secondary battery, which improves charge-discharge characteristics, lifespan, and temperature characteristics of the battery and which includes interposing a separator between a positive electrode plate and a negative electrode plate, thus manufacturing an electrode assembly; housing the electrode assembly in a battery case, introducing an additive-containing electrolytic solution, and then sealing the battery case; subjecting the sealed battery case to pre-charging, and then removing gas generated by the pre-charging; and subjecting the battery case to formation, wherein the additive is one or more selected from among LiF2BC2O4, 3,9-divinyl-2,4,8,10-tetraoxaspiro [5,5]undecane, LiBC(C2O4)2, poly(ethyleneglycol)borate and derivatives thereof, halogen- substituted carbonate, and vinyl silane, and the pre-charging is conducted in a range of 50-100% of a battery capacity.

Description

technical field [0001] The present invention relates to a method of manufacturing a lithium secondary battery, and more particularly, to a method of manufacturing a lithium secondary battery by which the battery is improved in charge-discharge characteristics, lifetime and temperature characteristics. Background technique [0002] In recent years, there has been an increasing demand for high-performance small batteries that last longer, are lightweight, and are highly reliable as portable electronic products, including video cameras, mobile phones, and notebook computers, are required to be smaller, lighter, and have increased functionality increase. In response to such demands, lithium secondary batteries are receiving great attention. [0003] According to the type of electrolyte, lithium secondary batteries are classified into lithium metal batteries, lithium ion batteries and lithium polymer batteries, and according to the type of packaging used to seal the electrode as...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/38H01M10/052H01M10/0567H01M10/058H01M10/36
CPCY02E60/12H01M10/058H01M2/12H01M10/052H01M10/446H01M10/52H01M10/0567Y10T29/4911Y02E60/10H01M50/30Y02P70/50
Inventor 闵载鈗吴全根李垠周高台坤
Owner SK ENERGY CO LTD (KR)
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