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Electrode having multi-layered electrode active material layer and secondary battery including same

A technology of electrode active materials and active material layers, which is applied in the field of secondary batteries, can solve the problems of aggravation of electrode active materials, and achieve the effect of preventing uneven dispersion and peeling, and preventing volume and weight increase

Active Publication Date: 2013-07-10
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] This problem may be exacerbated with increasing loading of electrode active materials

Method used

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  • Electrode having multi-layered electrode active material layer and secondary battery including same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0086] (1) Manufacture of positive electrode

[0087] Mix 94% by weight Li(Ni 1 / 3 co 1 / 3 mn 1 / 3 )O 2 and Li 2 MnO 4 While the obtained mixed positive active material, 3.5% by weight of Super-P (conductive material) and 2.5% by weight of PVdF (binder) were added in N-methyl-2-pyrrolidone (NMP) solvent to prepare positive active material slurry material.

[0088] The positive electrode active material slurry is 260mg / 25cm 2 The loadings were spread on aluminum foil and dried in vacuum. Subsequently, the cathode active material slurry was coated with the same loading amount for the second time.

[0089] (2) Manufacture of negative electrode

[0090] Artificial graphite is used as the negative electrode active material. 94% by weight of artificial graphite, 1% by weight of Super-P (conductive material), and 5% by weight of PVdF (binder) were added to the NMP solvent to prepare a negative active material slurry. The slurry was then coated once on a copper foil, dried and...

Embodiment 2

[0096] In addition to using Li(Ni 1 / 3 co 1 / 3 mn 1 / 3 )O 2 and LiMn 1.9 Al 0.1 o 4 A battery was manufactured by performing the same method as described in Example 1 except for the positive electrode active material.

Embodiment 3

[0098] In addition to using Li 1.2 (Ni 1 / 3 co 1 / 3 mn 1 / 3 ) 0.8 o 2 and LiMn 1.8 Al 0.2 o 4 A battery was manufactured by performing the same method as described in Example 1 except for the positive electrode active material.

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Abstract

The present invention relates to an electrode having a multi-layered electrode active material layer and a secondary battery including the same. The invention according to one embodiment of the present invention comprises electrodes having multi-layered electrode active material layers, wherein the content of the active materials which form the electrode active material layers is equally maintained and the loading amounts at each layer are either the same or different from each other, thereby solving the problem of performance deterioration caused by an increase in battery resistance due to the detachment of a binder or the like.

Description

technical field [0001] This application claims priority from Korean Patent Application No. 10-2011-0041438 filed in the Korean Intellectual Property Office on May 2, 2011, the disclosure of which is incorporated herein by reference. [0002] The present invention relates to an electrode comprising a multilayer electrode active material layer and a secondary battery comprising the electrode, and more particularly, to an electrode active material for uniform dispersion and adhesion by forming an electrode active layer in the form of a multilayer coating A secondary battery having improved performance by using an additive resin to reduce battery resistance. Background technique [0003] Recently, research on lithium secondary batteries having high energy density has been actively conducted as electronic equipment is miniaturized and lightweight and portable electronic equipment is generally used. [0004] A lithium secondary battery uses a material that can perform intercalati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/139H01M10/052H01M4/02
CPCH01M4/0404H01M4/13H01M4/131H01M4/139H01M4/1391H01M10/0525H01M2004/021Y02E60/10H01M4/02H01M10/052Y02P70/50
Inventor 成洛奇柳德弦具滋训金正镇沈慧琳
Owner LG ENERGY SOLUTION LTD
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