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Anode for lithium secondary battery and lithium secondary battery including same

A negative electrode and electrode technology, which is applied in the field of negative electrodes and lithium secondary batteries containing the negative electrodes, can solve the problems of intensified surface pressing, reduced surface porosity ratio, reduced battery performance and life characteristics, etc., to improve mobility and improve charging characteristics and life characteristics, and the effect of improving porosity

Inactive Publication Date: 2014-10-29
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, conventionally, when the rolling process of the electrode is performed, the surface is more pressed than the inside of the negative electrode active material, and the pore ratio of the surface is lowered.
[0009] The thicker the electrode, the more obvious this phenomenon is, and as the electrolyte is difficult to impregnate the inside of the electrode, the movement path of ions cannot be ensured, so it is difficult to realize the smooth movement of ions, so battery performance and life characteristics will be affected. reduction of

Method used

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  • Anode for lithium secondary battery and lithium secondary battery including same
  • Anode for lithium secondary battery and lithium secondary battery including same
  • Anode for lithium secondary battery and lithium secondary battery including same

Examples

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preparation example Construction

[0042] And, according to an embodiment of the present invention, a method for preparing a negative electrode is provided, the method for preparing the negative electrode includes: coating a first negative electrode active material slurry comprising a first negative electrode active material and a binder resin on an electrode collector the step of forming a negative electrode active material layer by drying the first negative electrode active material slurry; coating the first negative electrode active material layer comprising a second negative electrode active material and a binder resin on the primary negative electrode active material layer Two steps of negative electrode active material slurry; the step of forming a secondary negative electrode active material layer by drying the second negative electrode active material slurry; and forming the primary negative electrode active material layer and the secondary negative electrode active material layer The electrode current c...

Embodiment 1

[0066]Mix when applying the pressure of 12.3MPa negative electrode density is the first negative electrode active material (artificial graphite) 97.3 parts by weight of 1.79g / cc, conductive material (Super-P (conductive carbon black)) 0.7 weight part, thickener (carboxylate) 1.0 parts by weight of methyl cellulose) and 1.0 parts by weight of a binder (styrene-butadiene rubber), thereby preparing the first negative electrode active material slurry.

[0067] Then, mix 97.3 parts by weight of the second negative electrode active material (artificial graphite) of 1.51g / cc when applying the pressure of 12.3MPa, 0.7 parts by weight of the conductive material (Super-P), thickener (carboxymethyl fiber) element) 1.0 parts by weight and binder (styrene-butadiene rubber) 1.0 parts by weight, thus preparing the second negative electrode active material slurry.

[0068] After the above-mentioned first negative electrode active material slurry and the second negative electrode active materi...

experiment example 1

[0077] (Experimental example 1: Determination of average particle size by compaction density meter)

[0078] The measurement of the compacted density of the negative electrode active material particles prepared in Example 1 and Comparative Examples 1 and 2 was performed using a powder resistance measuring instrument MCP-PD51 of Mitsubishi Chemical Corporation.

[0079] In the case of the above-mentioned powder resistance measuring instrument, a predetermined amount of positive electrode active material powder is placed in a cylinder-type load cell, and the pressure is continuously applied. At this time, the density of the particles when pressed is measured. Therefore, the greater the strength of the negative electrode active material particles, the less they are pressed under the same pressure, thus exhibiting a lower density. At this time, the applied pressure is about 12 to 16 MPa.

[0080] The average particle size of the negative electrode active materials prepared in Exa...

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Abstract

The present invention relates to an anode for a lithium secondary battery, comprising: an electrode collector; and a multilayer structure including a primary anode active material layer including a first anode active material formed on the electrode collector, and a secondary anode active material layer including a second anode active material formed on the first anode active material layer and having a relatively low density and a relatively large average particle size. The anode according to one embodiment of the present invention can improve a charging characteristic and a lifespan characteristic of the lithium secondary battery by improving the porosity of the surface of an electrode after a rolling process by including a multilayer active material layer including two kinds of anode active materials having different rolling densities and average particle sizes on the electrode collector, so as to improve mobility of ions into the inside of the electrode.

Description

technical field [0001] The present invention relates to a negative electrode for a lithium secondary battery and a lithium secondary battery comprising the negative electrode, more particularly, to a negative electrode comprising multilayer active material layers having different compacted densities and average particle sizes of the negative electrode active material, and the negative electrode comprising the negative electrode. Negative lithium secondary battery. Background technique [0002] With rising energy prices caused by the depletion of fossil fuels and increased concerns about environmental pollution, environmentally friendly alternative energy has become an indispensable factor for future life. For this reason, research on various power generation technologies utilizing natural energy such as atomic energy, sunlight, wind power, and tidal force is continuing, and power storage devices that more effectively utilize the energy generated in the above-mentioned ways a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/133H01M4/583H01M10/052
CPCH01M4/0404H01M4/0435H01M4/133H01M4/1393H01M4/366H01M4/583H01M4/587H01M4/622H01M2004/021H01M2220/20H01M10/052Y02E60/10H01M4/62
Inventor 安炳勋裴峻晟丘昌完
Owner LG CHEM LTD
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