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 e

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

Example Embodiment

[0076] Wherein the preparation of the negative electrode comprising: masking extension line of the boundary line between the negative electrode current collector and a negative electrode portion of the ear portion adjacent to the negative electrode when observed from a position above; and a negative electrode active material slurry was dried on the negative electrode current collector part coated ; and removing the mask.

[0077] In the case of the method of manufacturing a lithium secondary battery of the present invention, the lithium secondary battery may be manufactured by a simpler method, the deterioration of the lithium secondary battery includes at preventing charging and discharging a lithium secondary battery due to obtain improved negative electrode has excellent life characteristics.

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

[0079] In the method of manuf...

Example Embodiment

[0135] [Example 1]

[0136]

[0137] Wherein the preparation of SiO x (0 50 ): 5μm to 10 m) and artificial graphite (average particle diameter (D 50 ): 10 m to 15 m) to 2: negative electrode active material weight ratio of 8 mixed with each other, styrene-butadiene rubber and carboxymethyl cellulose to 2: 3 ratio by weight of the binder mixed with each other, and a carbon nanotube (CNT) dispersing the conductive material. The silicon negative electrode active material in an amount of 11.4 wt%.

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

[0139] Using a casting polypropylene (CPP) with (commercially available from Tapex Ltd., width: 2mm, thickness: 50 m) than 10 m, in addition to the projecting portion: edge protruding copper film (width: 200mm, length: 100mm, thickness ) as to figure 1 A shape sho...

Example Embodiment

[0149] [Example 2]

[0150] Except by figure 1 b attached form a copper thin film with a tape having a coated manufactured figure 2 Negative electrode active material than a shape of b, the same procedure as in Example 1.

[0151] Evaluation of the lithium secondary battery prepared according to the above evaluation method.

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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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