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Negative electrode for lithium secondary battery and lithium secondary battery including same

A lithium secondary battery and negative electrode technology, which is applied in the field of lithium secondary batteries, can solve problems such as deterioration of life characteristics, reduction of electrode adhesion, and increase of interface resistance

Pending Publication Date: 2021-12-17
SK ON CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, SiO x The material has problems such as an increase in interfacial resistance and a deterioration in lifetime characteristics due to side reactions between Si-based materials and electrolytes, and a decrease in electrode adhesion due to volume expansion, making SiO x The application of the material is limited

Method used

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  • Negative electrode for lithium secondary battery and lithium secondary battery including same
  • Negative electrode for lithium secondary battery and lithium secondary battery including same
  • Negative electrode for lithium secondary battery and lithium secondary battery including same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073]

[0074] By adding 90.4% by weight of the first graphite-based active material (wherein artificial graphite (D50: 20 μm) and natural graphite (D50: 10 μm) are mixed in a weight ratio of 5:5), 6.0% by weight of silicon oxide (SiO x , 0<x<2, D50:5μm) of the first silicon-based active material, 0.1% by weight of SWCNT conductive material and 3.5% by weight of CMC / SBR (binder, 1.5 / 2.0 by weight) to prepare the first Negative slurry.

[0075] Prepare the second negative electrode slurry in the same manner as the first negative electrode slurry, except that the second graphite-based active material mixed with artificial graphite and natural graphite in a weight ratio of 9:1 is used instead of the first graphite-based active material .

[0076] By adding 96.4% by weight of artificial graphite with an average particle size (D50) of 20 μm to water, 0.1% by weight of SWCNT conductive material and 3.5% by weight of CMC / SBR (binder, 1.5 / 2.0) to prepare the third negative elect...

Embodiment 2 and Embodiment 3 and comparative example 1- comparative example 3

[0090] Negative electrode and button cell are manufactured in the same manner as in Example 1, except that the weight of artificial graphite and natural graphite in the first graphite-based active material (first layer) and the second graphite-based active material (second layer) is such as Table 1 below.

Embodiment 4- Embodiment 7

[0116] Negative electrode and button battery were manufactured in the same manner as in Example 1, except that the thicknesses of the first negative electrode active material layer and the second negative electrode active material layer were prepared as shown in Table 4 below.

[0117] (Evaluation method)

[0118] *Evaluation of the interfacial adhesion between the negative electrode active material layer and the current collector

[0119] The evaluation of the negative electrodes manufactured in Example 1 and Example 4-Example 7 was performed in the same manner as the evaluation of the interfacial adhesive force of Evaluation Example 1, and the evaluation results are summarized in Table 4 below.

[0120] *Evaluation of electrode volume expansion rate during negative electrode charging

[0121] The negative electrode and the button battery manufactured in Examples 1 and 4-7 were charged with a constant current of 0.1C rate at room temperature (25°C) until the voltage reac...

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Abstract

Provided are a negative electrode for a lithium secondary battery and a lithium secondary battery including the same, the negative electrode for a lithium secondary battery including a current collector; a first negative electrode active material layer disposed on the current collector and including a first graphite-based active material containing artificial graphite and natural graphite, and a first silicon-based active material; and a second negative electrode active material layer disposed on the first negative electrode active material layer and including a second graphite-based active material containing artificial graphite and natural graphite, and a second silicon-based active material. The first graphite-based active material has a content of the artificial graphite equal to or less than that of the natural graphite, and the second graphite-based active material has a content of the artificial graphite greater than that of the natural graphite.

Description

technical field [0001] The present invention relates to a negative electrode for a lithium secondary battery and a lithium secondary battery including the negative electrode. Background technique [0002] Recently, with the emergence of the problem of global warming, the demand for environmentally friendly technologies as countermeasures against global warming has rapidly increased. In particular, demand for lithium secondary batteries as energy storage devices is surging as demand for electric vehicles and energy storage system (ESS) technology increases. Therefore, research to improve the energy density of lithium secondary batteries is ongoing. [0003] However, existing commercial lithium secondary batteries usually use graphite active materials such as natural graphite and artificial graphite, but due to the low theoretical capacity of graphite (372mAh / G), the energy density of existing commercial lithium secondary batteries is relatively low. Low. Therefore, researc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/133H01M4/1393H01M4/583H01M4/64
CPCH01M4/133H01M4/1393H01M4/583H01M4/64H01M2004/027H01M4/587H01M10/0525H01M4/386H01M4/364H01M4/366H01M4/134H01M4/483Y02E60/10H01M10/052H01M2004/021
Inventor 韩俊喜金孝美金汶成柳相百陸承炫张焕浩
Owner SK ON CO LTD