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Multi-layer anode comprising natural graphite and artificial graphite, and lithium secondary battery comprising same

A technology of natural graphite and artificial graphite, applied in the direction of secondary batteries, negative electrodes, battery electrodes, etc., can solve the problems of reduced capacity, reduced amount of active materials, increased internal resistance of electrodes, etc., and achieve the effect of improving output characteristics and life characteristics

Active Publication Date: 2018-10-23
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, when the content of the binder is increased to improve the electrode adhesion, the internal resistance of the electrode increases, the electronic conductivity decreases, and the capacity also decreases.
In other words, when the content of the conductive material is increased to improve the output characteristics, the adhesion decreases, and the amount of the active material decreases, so the capacity decreases
[0009] In addition, in the drying process of the coated electrode, since the temperature condition is "Tg or higher", the binder and the conductive material contained in the slurry state move in the direction in which the solvent volatilizes (the direction away from the current collector) , so that the adhesion between the current collector and the electrode mixture is further weakened

Method used

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  • Multi-layer anode comprising natural graphite and artificial graphite, and lithium secondary battery comprising same
  • Multi-layer anode comprising natural graphite and artificial graphite, and lithium secondary battery comprising same
  • Multi-layer anode comprising natural graphite and artificial graphite, and lithium secondary battery comprising same

Examples

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Effect test

example 1

[0098] 1-1. Preparation of the first negative electrode slurry

[0099] Natural graphite (amorphous graphite, specific surface area: 3.0m 2 / g, tap density: 0.95g / cc, degree of orientation: 25), SBR used as binder, CMC used as thickener, and carbon black used as conductive material were weighed to have 94:2.5 : 2: 1.5 weight ratio, and then placed in distilled water and mixed (mixing), so as to prepare the first negative electrode slurry.

[0100] 1-2. Preparation of the second negative electrode slurry

[0101] Artificial graphite (specific surface area: 1.5m 2 / g, tap density: 0.9g / cc, degree of orientation: 12), SBR used as binder, CMC used as thickener, and carbon black used as conductive material were weighed to have 94:2.5 :2:1.5 weight ratio, and then placed in distilled water and mixed (mixing), so as to prepare the second negative electrode slurry.

[0102] 1-3. Preparation of negative electrode

[0103] The first negative electrode slurry with 6mg / cm 2 The...

example 2

[0105] Negative electrode was prepared in the same manner as Example 1, except that natural graphite (amorphous graphite, specific surface area: 3.5 m 2 / g, tap density: 1.00 g / cc, degree of orientation: 28) was used as the first negative electrode active material.

example 3

[0107] Negative electrodes were prepared in the same manner as in Example 1, except that natural graphite (amorphous graphite, specific surface area: 3.0 m 2 / g, tap density: 0.95g / cc, degree of orientation: 25) and flaky artificial graphite with an average particle diameter D50 of 20.8μm (specific surface area: 1.5m 2 / g, tap density: 0.9g / cc, degree of orientation: 12) mixed in a weight ratio of 3:7 as the first negative electrode active material.

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Abstract

The present disclosure relates to a multilayer negative electrode comprising a negative electrode current collector configured to transfer electrons between an outer lead and a negative electrode active material, a first negative electrode mixture layer formed on one surface or both surfaces of the current collector and containing natural graphite as a negative electrode active material and a second negative electrode mixture layer formed on the first negative electrode mixture layer and containing artificial graphite as a negative electrode active material, and a lithium secondary battery including the same.

Description

technical field [0001] The present disclosure relates to a multilayer negative electrode including natural graphite and artificial graphite and a lithium secondary battery including the multilayer negative electrode. Background technique [0002] With the technological development and increase in demand for mobile devices, the demand for secondary batteries as energy sources is rapidly increasing. Among such secondary batteries, lithium secondary batteries having high energy density, high operating voltage, long cycle life, and low discharge rate have been commercialized and widely used. [0003] Recently, with increasing attention to environmental issues, electric vehicles (EVs), hybrid vehicles capable of replacing vehicles using fossil fuels such as gasoline vehicles and diesel vehicles, which are one of the main causes of air pollution, have been actively developed. Research on powered vehicles (HEV), etc. As a power source for electric vehicles (EV), hybrid electric v...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/133H01M4/587H01M4/62H01M10/0525
CPCH01M4/133H01M4/364H01M4/366H01M4/587H01M10/0525Y02E60/10H01M4/621H01M4/625H01M4/624H01M2004/027
Inventor 李泽秀丘昌完崔相勳梁眐珉文日载
Owner LG ENERGY SOLUTION LTD
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