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Negative electrode for lithium secondary battery and lithium secondary battery comprising the same

一种锂二次电池、负极的技术，应用在锂二次电池领域，能够解决寿命特性降低、Si与粘合剂弱亲和力、劣化电极粘附力等问题，达到改善寿命特性、优异粘附力、改善输出特性的效果

Active Publication Date: 2018-03-09
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, Si has a weak affinity with the binder, which may deteriorate the adhesion of the electrode, and may also cause a decrease in lifetime characteristics due to volume expansion.

Method used

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  • Negative electrode for lithium secondary battery and lithium secondary battery comprising the same
  • Negative electrode for lithium secondary battery and lithium secondary battery comprising the same
  • Negative electrode for lithium secondary battery and lithium secondary battery comprising the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Mix 89.8% by weight of natural graphite, 4.7% by weight of SiO, 1.5% by weight of carbon black, 3% by weight of SBR binder and 1% by weight of CMC to prepare the first negative electrode slurry, and mix 94.5% by weight of artificial Graphite (coal tar pitch), 1.5% by weight of carbon black, 3% by weight of SBR binder and 1% by weight of CMC were used to prepare the second negative electrode slurry.

[0052] The first negative electrode slurry is 149mg / 25cm 2 The loading amount is coated on the copper foil, and the second negative electrode slurry is 345mg / 25cm 2 The loading amount of the first negative electrode slurry was coated on the upper surface of the first negative electrode slurry, and then they were dried in a vacuum oven at 100° C. for 10 hours or more. Then, an anode composed of a first anode mixture layer having a thickness of 48.1 μm and a second anode mixture layer having a thickness of 111.5 μm (a total thickness of 159.6 μm) was fabricated using a roll ...

Embodiment 2

[0056] Mix 85.1% by weight of natural graphite, 9.4% by weight of SiO, 1.5% by weight of carbon black, 3% by weight of SBR binder and 1% by weight of CMC to prepare the first negative electrode slurry, and mix 94.5% by weight of artificial Graphite (coal tar pitch), 1.5% by weight of carbon black, 3% by weight of SBR binder and 1% by weight of CMC were used to prepare the second negative electrode slurry.

[0057] The first negative electrode slurry is 150mg / 25cm 2 The loading amount is coated on the copper foil, and the second negative electrode slurry is 347mg / 25cm 2 The loading amount of the first negative electrode slurry was coated on the upper surface of the first negative electrode slurry, and then they were dried in a vacuum oven at 100° C. for 10 hours or more. Then, an anode composed of a first anode mixture layer having a thickness of 47.1 μm and a second anode mixture layer having a thickness of 109.1 μm (a total thickness of 156.2 μm) was fabricated using a roll ...

Embodiment 3

[0059] Mix 89.8% by weight of natural graphite, 4.7% by weight of SiO, 1.5% by weight of carbon black, 3% by weight of SBR binder and 1% by weight of CMC to prepare the first negative electrode slurry, and mix 94.5% by weight of artificial Graphite (coal tar pitch), 1.5% by weight of carbon black, 3% by weight of SBR binder and 1% by weight of CMC were used to prepare the second negative electrode slurry.

[0060] Described first negative electrode slurry is with 50mg / 25cm 2 The loading amount is coated on the copper foil, and the second negative electrode slurry is 447mg / 25cm 2The loading amount of the first negative electrode slurry was coated on the upper surface of the first negative electrode slurry, and then they were dried in a vacuum oven at 100° C. for 10 hours or more. Then, an anode composed of a first anode mixture layer having a thickness of 16.1 μm and a second anode mixture layer having a thickness of 144.4 μm (a total thickness of 160.5 μm) was fabricated usin...

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Abstract

The invention relates to a negative electrode for a lithium secondary battery and a lithium secondary battery comprising the same. Disclosed is a negative electrode for a lithium secondary battery having excellent electric conductivity and adhesion even though a high-loading negative electrode is used, and the negative electrode includes a negative electrode current collector; a first negative electrode mixture layer containing a first negative electrode active material, a first polymer binder and a first conductive material and formed on at least one surface of the negative electrode currentcollector; and a second negative electrode mixture layer containing a second negative electrode active material, a second polymer binder and a second conductive material and formed on an upper surfaceof the first negative electrode mixture layer, wherein the first negative electrode active material contains natural graphite and silicon oxide, and the second negative electrode active material contains artificial graphite.

Description

technical field [0001] This application claims priority to Korean Patent Application No. 10-2016-0109236 filed in the Republic of Korea on Aug. 26, 2016, the disclosure of which is incorporated herein by reference. [0002] The present disclosure relates to a negative electrode for a lithium secondary battery and a lithium secondary battery including the same, and more particularly, to a negative electrode for a lithium secondary battery having high capacity characteristics, and a lithium secondary battery including the same. Background technique [0003] With the technological development and demand growth of mobile devices, the demand for secondary batteries as energy sources is rapidly increasing. Among secondary batteries, lithium secondary batteries having high energy density and voltage, long life cycle, and low discharge rate are commercially available and widely used. [0004] The lithium secondary battery includes a positive electrode having a positive electrode ac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/133H01M4/36H01M4/48H01M4/587H01M10/052
CPCH01M4/133H01M4/364H01M4/48H01M4/587H01M10/052C08L9/06H01M4/131H01M4/366H01M4/622H01M4/623H01M10/0525Y02E60/10H01M4/624C01B32/20
Inventor 金荣宰金帝映
Owner LG ENERGY SOLUTION LTD
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