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Lithium secondary battery including negative electrode having improved resistance to degradation, and method for manufacturing same

A lithium secondary battery and negative electrode technology, which is applied in the field of lithium secondary battery and its manufacturing, can solve the problems of poor performance of lithium secondary battery and limit the realization of secondary battery, and achieve the effect of preventing volume expansion and simple process

Pending Publication Date: 2021-11-26
SK新能源株式会社
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these technologies still have the problem that the performance of the lithium secondary battery deteriorates due to the deterioration of the negative electrode when the lithium secondary battery is charged and discharged.
Furthermore, this limits the realization of lithium secondary batteries with high capacity

Method used

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  • Lithium secondary battery including negative electrode having improved resistance to degradation, and method for manufacturing same
  • Lithium secondary battery including negative electrode having improved resistance to degradation, and method for manufacturing same
  • Lithium secondary battery including negative electrode having improved resistance to degradation, and method for manufacturing same

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0076] Wherein the preparation of the negative electrode includes: covering the position adjacent to the extension line of the boundary line between the negative electrode current collector part and the negative electrode tab part when observing the negative electrode from above; coating the negative electrode active material slurry on the negative electrode current collector part and drying ; and unmasking.

[0077] In the case of the method of manufacturing a lithium secondary battery according to the present invention, it is possible to manufacture a lithium secondary battery by a simpler method, which includes obtaining the advantage in preventing deterioration caused at the time of charging and discharging of the lithium secondary battery. Improved anode with excellent lifetime characteristics.

[0078] In this case, in addition to preparing the negative electrode, a method of manufacturing a lithium secondary battery known in the art may be employed.

[0079] In the met...

Embodiment 1

[0136]

[0137] SiO x (050 ): 5μm to 10μm) and artificial graphite (average particle size (D 50 ): 10 μm to 15 μm) negative electrode active material mixed with each other at a weight ratio of 2:8, binder with styrene-butadiene rubber and carboxymethyl cellulose mixed with each other at a weight ratio of 2:3, and carbon nanotubes (CNT) Disperse conductive substances. The content of silicon in the negative electrode active material was 11.4% by weight.

[0138] The prepared negative active material, binder, and conductive material were mixed with each other in a weight ratio of 94:5:1, and then dispersed in water to prepare negative active material slurry.

[0139] A copper film (width: 200 mm, length: 100 mm, thickness: 10 µm, except for the protruding part) was edged with a cast polypropylene (CPP) tape (available from Tapex Co., Ltd., width: 2 mm, thickness: 50 µm). ) as figure 1 Tape and mask the shape shown in a.

[0140] The negative electrode active material slurr...

Embodiment 2

[0150] except through the figure 1 The shape of b is manufactured by taping a copper film coated with a figure 2 Except for the negative electrode of the negative electrode active material having the shape of b, the same procedure as in Example 1 was carried out.

[0151] The produced lithium secondary batteries were evaluated according to the above-mentioned evaluation methods.

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Abstract

The present invention pertains to: a lithium secondary battery comprising a negative electrode of which a specific region includes a non-coated portion that is not coated with a negative electrode active material; and a method for manufacturing the lithium secondary battery. This lithium secondary battery comprises a negative electrode having improved resistance to degradation caused by volume expansion of a negative electrode active material during charging / discharging, and can thus exhibit high capacity and excellent lifetime characteristics.

Description

technical field [0001] The present invention relates to a lithium secondary battery and a manufacturing method thereof. Background technique [0002] Recently, as demand for electronic equipment such as mobile equipment has increased, demand for lithium secondary batteries such as lithium batteries, lithium ion batteries, and lithium ion polymer batteries as driving power sources for these electronic equipment has increased significantly. In addition, the growth of the electric vehicle market has accelerated in line with the trend of tightening regulations on fuel efficiency and exhaust emissions of vehicles around the world, and accordingly, the demand for medium-sized and large secondary batteries such as those used in electric vehicles (EVs) Demand for secondary batteries and secondary batteries for energy storage systems (ESS) is expected to increase rapidly. [0003] The development of secondary battery technology continues to accelerate. In particular, silicon-based ...

Claims

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Application Information

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IPC IPC(8): H01M4/134H01M50/531H01M4/1395H01M10/052H01M4/04
CPCY02E60/10H01M4/134H01M50/531H01M4/1395H01M10/052H01M4/0404H01M4/382H01M4/70H01M4/04H01M4/0471Y02P70/50
Inventor 朴恩俊金俊燮朴贵玉李智喜
Owner SK新能源株式会社
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