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Electrode for lithium secondary battery

A lithium secondary battery and electrode technology, which is applied in the field of electrodes for lithium secondary batteries, can solve the problems of electrode resistance and output characteristic degradation, battery performance degradation, and electrode conductivity cannot be fully guaranteed, and achieve excellent resistance and output characteristics Effect

Pending Publication Date: 2021-01-19
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At this time, the conductivity of the electrode cannot be sufficiently secured, so the resistance and output characteristics of the electrode deteriorate, resulting in a decrease in battery performance

Method used

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  • Electrode for lithium secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0083] (1) Manufacture of positive electrode

[0084] Li(Ni 0.6 mn 0.2 co 0.2 )O 2 , as the positive electrode active material B Li(Ni 0.6 mn 0.2 co 0.2 )O 2 , carbon black as a conductive material, and polyvinylidene fluoride (PVdF) as a binder, a positive electrode was produced by the following method.

[0085] The active material that will be mixed with positive electrode active material A of 7:3 weight ratio and positive electrode active material B is with active material: conductive material: the weight ratio of binding agent=97:1:2 is mixed, and use N-methylpyrrolidone ( NMP) was used as a solvent to prepare the slurry for the first active material layer.

[0086] In addition, the active material mixed with positive electrode active material A and positive electrode active material B in a weight ratio of 9:1 is mixed in a weight ratio of active material:conductive material:binder=97:1:2, and N-methyl Pyrrolidone (NMP) was used as a solvent to prepare the slurry ...

Embodiment 2

[0093] (1) Manufacture of positive electrode

[0094] Li(Ni 0.6 mn 0.2 co 0.2 )O 2 , as the positive electrode active material B Li(Ni 0.6 mn 0.2 co 0.2 )O 2 , carbon black as a conductive material, and polyvinylidene fluoride (PVdF) as a binder, a positive electrode was produced by the following method.

[0095] The active material that will be mixed with positive electrode active material A of 7:3 weight ratio and positive electrode active material B is with active material: conductive material: the weight ratio of binding agent=97:1:2 is mixed, and use N-methylpyrrolidone ( NMP) was used as a solvent to prepare the slurry for the first active material layer.

[0096] In addition, the active material mixed with positive electrode active material A and positive electrode active material B in a weight ratio of 9:1 is mixed in a weight ratio of active material:conductive material:binder=97:1:2, and N-methyl Pyrrolidone (NMP) was used as a solvent to prepare the slurry ...

experiment example 1

[0116] For the lithium secondary batteries manufactured in Examples and Comparative Examples, battery resistance characteristics were evaluated at 25° C. using a constant current / constant potential controllable charger / discharger.

[0117] In detail, the operating conditions of each battery are as follows.

[0118] Charging: 0.1C, CC / CV, 4.3V, 0.005C cutoff

[0119] Discharge: 0.1C, CC, 2.0V

[0120] refer to figure 1 , it was confirmed that although having the same load capacity, Examples 1 and 2 exhibited a significant decrease in resistance compared to Comparative Example 1 configured to have a single layer. However, as in Comparative Example 2, when the ratio of the large particle diameter active material in the first active material layer was higher than that in the second active material layer, there was no effect of improving resistance. In contrast, Comparative Example 3 showed an increase in resistance.

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Abstract

The present invention relates to an electrode for a lithium secondary battery, having a high amount of an active material so as to be capable of implementing a high capacity characteristic, and havingan excellent resistance characteristic and output characteristic.

Description

technical field [0001] Cross References to Related Applications [0002] This application is based on and claims priority from Korean Patent Application No. 10-2019-0039670 filed on April 4, 2019, the disclosure of which is hereby incorporated by reference in its entirety. [0003] The present invention relates to an electrode for a lithium secondary battery having excellent resistance and output characteristics. Background technique [0004] Recently, as demand for electric vehicles (EVs), hybrid electric vehicles (HEVs) and the like increases, demand for lithium secondary batteries having high energy density, high discharge voltage, and output stability as their power sources is expanding. [0005] In order to realize the high-capacity characteristics of lithium secondary batteries, it is necessary to increase the loading capacity of the electrodes, which increases the active material content of the electrodes and the thickness of the electrodes. At this time, the conduc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/36H01M4/525H01M4/505H01M10/052H01M4/02
CPCH01M4/131H01M4/505H01M4/525H01M4/366H01M10/0525H01M10/052H01M2004/028H01M2004/021H01M4/13Y02E60/10H01M4/364
Inventor 尹智熙李泽秀崔相勋金哲佑
Owner LG ENERGY SOLUTION LTD