Lithium secondary battery and manufacturing method for same

A lithium secondary battery and electrode technology, applied in the field of lithium secondary battery and its manufacturing, can solve the problems of poor high-speed discharge characteristics, excessive temperature rise, long current flow distance, etc., to improve reliability, shorten current flow distance, Effect of improving high-speed discharge characteristics

Inactive Publication Date: 2011-01-05
SK ENERGY CO LTD (KR)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Thus, the conventional lithium secondary battery has problems in that: its high-speed discharge characteristics are poor because the current flow distance is long; and the temperature is excessively raised by the heat generated by the current flow.

Method used

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  • Lithium secondary battery and manufacturing method for same
  • Lithium secondary battery and manufacturing method for same
  • Lithium secondary battery and manufacturing method for same

Examples

Experimental program
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Embodiment approach

[0046] The present invention will be described in more detail below with reference to the accompanying drawings.

[0047] figure 1 is a perspective view showing a lithium secondary battery according to an embodiment of the present invention.

[0048] refer to figure 1 , a lithium secondary battery according to an embodiment of the present invention includes: a first electrode 22 (hereinafter referred to as "cathode") and a second electrode 24 (hereinafter referred to as "anode"), which are provided with a separator 12 therebetween is wound; an electrode group comprising a first electrode sheet 32 ​​connected to the cathode 22 (hereinafter referred to as "cathode sheet") and a second electrode sheet 34 connected to the anode 24 (hereinafter referred to as "anode sheet"); and containing The casing of the electrode group (not shown in the figure).

[0049]Depending on the type of lithium secondary battery, a liquid electrolyte may be filled in the case, or the separator 12 may...

Embodiment

[0098] LiCoO as the cathode active material 2 , polyvinylidene fluoride (PVDF) as a binder, and carbon black as a conductive material were mixed to form a mixture, and then N-methylpyrrolidone (NMP) was added to the mixture to prepare a slurry.

[0099] The slurry was applied at intervals to one side of the cathode current collector body made of aluminum foil, and then applied at intervals to the other side of the cathode current collector body to form a plurality of cathode active material patterns. A cathode current collector body including a plurality of cathode active material patterns formed on both sides thereof was dried until N-methylpyrrolidone (NMP) was completely volatilized, and then rolled.

[0100] The rolled cathode current collector body was cut to form a cathode including two cathode active material patterns, and a cathode central uncoated portion formed between the two cathode active material patterns.

[0101] A cathode tab made of aluminum was connected to...

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Abstract

The present invention relates to a lithium secondary battery with an improved structure and characteristics, and a manufacturing method for same. The lithium secondary battery of the present invention includes a first electrode having a first current collector, and first active material patterns formed on the first current collector such that the first active material patterns are symmetrical to each other with a first center non-coated portion formed therebetween; a second electrode having a second current collector, and second active material patterns formed on the second current collector such that the second active material patterns are symmetrical to each other with a second center non-coated portion formed therebetween; a first electrode tab connected to the first center non-coated portion; and a second electrode tab connected to the second center non-coated portion.

Description

technical field [0001] The present invention relates to a lithium secondary battery, and more particularly, to a lithium secondary battery with improved structure and characteristics and a manufacturing method thereof. Background technique [0002] In general, chemical batteries refer to batteries that use chemical reactions to generate electrical energy, and these chemical batteries can be classified into disposable primary batteries and secondary batteries that can be charged and discharged so as to be repeatedly used. Among these chemical batteries, the application of secondary batteries is gradually increasing due to the advantage of being reusable. [0003] Among secondary batteries, lithium secondary batteries have high energy density per unit weight, and thus are widely used in electronic communication devices or high-power hybrid vehicles. This lithium secondary battery includes: an anode, a cathode, a separator arranged between the anode and the cathode, and an ano...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/04H01M50/528
CPCY02E60/122H01M10/0587H01M10/052H01M2/22Y10T29/49114Y10T29/49108Y02E60/10H01M50/528Y02P70/50H01M10/058H01M50/531H01M50/105H01M10/0431
Inventor 吴全根李垠周李宰明韩基洙
Owner SK ENERGY CO LTD (KR)
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