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Fabrication of lithium secondary battery

A technology for battery casing and electrode preparation, which is applied in the direction of secondary battery, lithium battery, secondary battery gas removal, etc., to achieve the effect of improving high temperature life and eliminating expansion phenomenon

Active Publication Date: 2009-12-16
SK ON CO LTD
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Problems solved by technology

[0010] Therefore, the present invention is designed to solve the problems encountered in the related field, and the present invention provides a method for preparing a lithium secondary battery, wherein a negative electrode SEI improver is used to improve the high-temperature life of the lithium secondary battery, and not only during pre-charging First degassing after the process, and second degassing after the molding process, thereby reducing swelling and exhibiting excellent charge-discharge characteristics, life and temperature characteristics

Method used

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

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Embodiment 1

[0037] As the positive electrode active material and the positive electrode conductive material, spinel LiMn is used respectively 2 O 4 And acetylene carbon black, and graphite is used as the negative electrode active material. Use 1M LiPF 6 The electrolyte is obtained by dissolving salt in an organic solvent mixture formed at a ratio of EC:EMC of 3:7. Use PVDF (polyvinylidene fluoride) as the positive electrode binder, and use the SBR / CMC (styrene butadiene rubber / carboxymethyl cellulose) system as the negative electrode binder. The battery pouch is formed of aluminum, and its thickness is 120 μm. The separator is a polyethylene separator.

[0038] In order to prepare the positive electrode plate, the positive electrode active material, the conductive material and the binder are added to the binder solution (NMP (N-methylpyrrolidone) solvent containing 10% by weight binder) in a weight ratio of 94:3:3 And then mixed together to prepare an electrode plate with a load level of 23 m...

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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; subjecting the battery case to formation; and removing gas generated by the 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 10% or less of a battery capacity.

Description

Technical field [0001] The present invention relates to a method of preparing a lithium secondary battery, and more specifically, the present invention relates to a method of preparing a lithium secondary battery, by which the battery is improved in charge-discharge characteristics, life span, and temperature characteristics. Background technique [0002] In recent years, as people need portable electronic products (including video cameras, mobile phones, and notebook computers) to be smaller and lighter and to increase their functions, there is an increasing demand for high-performance small batteries (which are longer in use, light and highly reliable) increase. In response to this demand, lithium secondary batteries are receiving great attention. [0003] According to the type of electrolyte, lithium secondary batteries are divided into lithium metal batteries, lithium ion batteries, and lithium polymer batteries, and according to the type of packaging used to seal the electro...

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
CPCY02E60/12H01M10/058H01M2/12H01M10/052H01M10/446H01M10/52H01M10/0567H01M50/30Y02E60/10Y02P70/50Y10T29/4911
Inventor 闵载鈗吴全根李垠周高台坤
Owner SK ON CO LTD
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