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Strip-shaped electrode used for cylindrical jelly roll and lithium secondary battery comprising same

A lithium secondary battery, cylindrical technology, applied in the field of lithium secondary batteries, can solve problems such as electrode coating cracking, and achieve the effect of excellent adhesion and excellent conductivity

Active Publication Date: 2019-11-15
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When such a high-load electrode is applied to a cylindrical battery, cracks occur on the electrode coating at the core, causing serious problems

Method used

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  • Strip-shaped electrode used for cylindrical jelly roll and lithium secondary battery comprising same
  • Strip-shaped electrode used for cylindrical jelly roll and lithium secondary battery comprising same
  • Strip-shaped electrode used for cylindrical jelly roll and lithium secondary battery comprising same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0088] Preparation of slurry for the first positive electrode active material layer

[0089] Preparation of LiNi as the cathode active material at a weight ratio of 94:3:2.7 0.6 co 0.2 mn 0.2 (LG Chem, HN601A), carbon black (Denka, SB50L) as a conductive material, PVDF (Kureha, KF7200) as a polymer binder. PVDF was dissolved in N-methylpyrrolidone as a solvent to form a binder solution, and active material particles and conductive materials were introduced into this binder solution, and then dispersed at 3,000 rpm in a commercially available homogenizer 50 minutes to obtain the first slurry for positive electrode material.

[0090] Preparation of the slurry for the second positive electrode active material layer

[0091] Preparation of LiNi as the cathode active material at a weight ratio of 96:3:0.3 0.6 co 0.2 mn 0.2 (LG Chem, HN601A), carbon black (Denka, SB50L) as a conductive material, PVDF (Kureha, KF7200) as a polymer binder. PVDF was dissolved in N-methylpyr...

Embodiment 2

[0095] Obtain the positive pole in the same manner as in Example 1, except that the positive electrode active material is used: conductive material: the weight ratio of the binder is 94.75:3:2.25 to prepare the first positive electrode slurry of Example 1, And use positive electrode active material: conductive material: the composition that the weight ratio of binder is 96.25:3:0.75 prepares the second positive electrode slurry, makes the binder contained in the first positive electrode active material layer and is contained in the second The weight ratio of the binder in the positive electrode active material layer became 75:25 (weight basis).

Embodiment 3

[0097] Obtain the positive electrode in the same manner as in Example 1, except that the first positive electrode slurry of Example 1 is prepared using a positive electrode active material: a conductive material: a weight ratio of 96.2:3:1.8 of the binder, And use positive electrode active material: conductive material: the composition that the weight ratio of binding agent is 95.8:3:1.2 prepares the second positive electrode slurry, makes the binding agent contained in the first positive electrode active material layer and is contained in the second The weight ratio of the binder in the positive electrode active material layer became 60:40 (weight basis).

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Abstract

The present invention relates to a strip-shaped electrode used for a cylindrical jelly roll in which a strip-shaped electrode assembly is wound in a cylindrical shape such that a hollow space is formed at a core part thereof, and a lithium secondary battery comprising the same, the strip-shaped electrode comprising: a strip-shaped electrode current collector; a first electrode active material layer formed on at least one surface of the strip-shaped electrode current collector; and a second electrode active material layer formed on the first electrode active material layer, wherein the second electrode active material layer is formed to be shorter than the first electrode active material layer such that the first electrode active material layer has one lengthwise side surface, a part of which is exposed to the outside.

Description

technical field [0001] This application claims priority from Korean Patent Application No. 10-2017-0148955 filed in Korea on Nov. 9, 2017, the disclosure of which is incorporated herein by reference. [0002] The present disclosure relates to a strip electrode for a cylindrical jelly roll and a lithium secondary battery including the same. Background technique [0003] With the technological development and increase in demand for mobile devices, there is an increasing demand for secondary batteries as energy sources. Among these secondary batteries, many studies have been conducted on lithium secondary batteries having high energy density and discharge voltage, and such lithium secondary batteries have been commercialized and widely used. [0004] According to the shape of the battery case, the secondary battery is divided into a cylindrical battery and a prismatic battery in which the electrode assembly is housed in a cylindrical or prismatic metal can, respectively, and a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M10/0587H01M10/052
CPCH01M10/0587H01M10/0525H01M4/131H01M10/0431H01M2220/30H01M4/621Y02E60/10Y02P70/50H01M4/13H01M4/366H01M10/052
Inventor 安炳勋梁眐崔相勋
Owner LG ENERGY SOLUTION LTD
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